Testing and Commissioning Procedure for
Electrical Installation
1. Introduction
The procedures stated in this T&C Procedure cover the activities in preliminary tests
and inspections, functional performance tests and the commissioning of newly
completed installations and existing ones after major alteration. They are so compiled
to facilitate the work of Project Building Services Engineer (PBSE) and Project
Building Services Inspector (PBSI), who are appointed as the Architect’s
Representatives, in the following aspects with respect to testing and commissioning
(T&C):-
(i) To vet and approve the T&C procedures proposed and submitted by the
contractor for the Electrical Installation (EE Contractor);
(ii) To witness those T&C procedures as specified; and
(iii) To accept the T&C certificates and other supporting data.
The EE Contractor shall carry out the T&C works as detailed in this T&C Procedure.
Supplementary T&C plans may be proposed by the EE Contractor as appropriate and
agreed by PBSE, e.g. for special equipment supplied and/or installed by the EE
Contractor.
The administrative requirements for T&C works are in general as specified in the
General Specification for Electrical Installation 2012 Edition and all current
corrigenda/amendments thereto published before the date of first tender invitation for
the Contract issued by the ArchSD (the General Specification).
All words and expressions shall have the meaning as assigned to them under the
General Specification unless otherwise specified herein.
“Major Alteration” of an existing electrical installation means alteration involving work
on any distribution board or electrical equipment having an electrical current rating
exceeding 100A single phase or 60A three phases in an existing electrical installation.
This T&C Procedure is also intended to lay down the minimum testing and
commissioning requirements to be carried out by the EE Contractor on a new Low
Voltage Cubicle Switchboard Installation upon completion or on an existing Low
Voltage Cubicle Switchboard Installation after a major alteration involving
modification of the main busbar such as upgrading, reposition and extension.
This T&C Procedure also covers the verification of the electrical installation and
lighting installation to demonstrate the compliance with the Building Energy Code
(hereinafter named as BEC) issued under the Building Energy Efficiency Ordinance
(Cap.610). The EE Contractor is required to check, measure and submit the required
information to PBSE for his/her consolidation to verify the design in compliance with
the BEC.
2. Objectives of the Testing and Commissioning (T&C) Works
The objectives of the T&C works are:-
(i) To verify proper functioning of the equipment/system after installation;
(ii) To verify that the performance of the installed equipment/systems meet with
the specified design intent or statutory requirements through a series of tests,
measurements and adjustments; and
(iii) To capture and record performance data of the whole installation as the
baseline for future operation and maintenance.
For the avoidance of doubt, depending on the specific demands of individual
installation, the PBSE may require additional or substitute T&C works in regard to any
elements in the installation other than those indicated in this T&C Procedure.
3. Scope of the Testing and Commissioning (T&C) Works
3.1 Preliminary Steps for Testing and Commissioning
Before carrying out T&C, the EE Contractor shall take the following steps:-
(a) Submit draft T&C procedures to the PBSE for approval. The draft
T&C procedures shall include essential procedures mentioned in this
T&C Procedure plus additional T&C procedures required for specific
installations as well as manufacturer’s recommendation;
(b) Obtain design drawings and specifications and to be thoroughly
acquainted with the design intent;
(c) Obtain copies of approved shop drawings and equipment schedules;
(d) Review approved shop drawings and equipment schedules;
(e) Check manufacturer’s operating instructions and statutory
requirements;
(f) Physically inspect the installation and equipment to determine
variations from designs and/or specifications;
(g) Check individual components, e.g. key switches, control equipment,
circuit breaker status, etc. for proper position and settings for
completeness of installation; and
(h) Check inclusion of manufacturer’s typical equipment testing data or
factors before T&C of particular equipment
3.2 Testing and Inspection during Construction
The purpose of these tests is to ensure that all components and systems are in a
satisfactory and safe condition before start up. Preliminary adjustment and
setting of equipment at this stage shall also be carried out at the same time to
pave way for the coming functional performance tests.
Before carrying out any test, the EE Contractor shall ensure that the Electrical
Installation (the Installations) complies with all relevant statutory requirements
and regulations. The T&C works shall also comply with all site safety
regulatory requirements currently in force. In particular, the EE Contractor
shall note the following:-
(a) Electricity Ordinance (Cap.406), and other subsidiary legislation made
under the Ordinance;
(b) Code of Practice for the Electricity (Wiring) Regulations published by
the EMSD (hereinafter named as COP);
(c) Occupational Safety and Health Ordinance (Cap.509), and other
subsidiary legislation made under the Ordinance;
(d) Factories and Industrial Undertakings Ordinance (Cap.59), and other
subsidiary legislation made under the Ordinance, including but not
limited to Construction Site (Safety) Regulations; and
(e) Electricity supply rules of the relevant power supply companies.
3.3 Statutory Test and Inspection
The statutory test and inspection herein stated in this T&C Procedure shall
refer to the Regulations Nos. 19, 20, 21 and 22 of the Electricity (Wiring)
Regulations (Cap.406E) under the Electricity Ordinance (Cap.406).
3.4 Functional Performance Tests
The purpose of functional performance tests is to demonstrate that the
Installations can meet the functional and performance requirements as specified
in the General Specification and/or Particular Specification. Functional
performance tests should proceed from the testing of individual components to
the testing of different systems in the Installations.
The EE Contractor may have to make temporary modifications as the tests
proceed. The specific tests required and the order of tests will vary depending
on the type and size of systems, number of systems, sequence of construction,
interface with other installations, relationship with the building elements and
other specific requirements as indicated in the General Specification and/or
Particular Specification. The testing of systems may have to be carried out in
stages depending on the progress of work or as proposed by the EE Contractor.
Part of the tests may be required to be carried out in suppliers’ premises in
accordance with the provisions in the General Specification and/or Particular
Specification.
Any performance deficiencies revealed during the functional performance tests
must be evaluated to determine the cause. After completion of the necessary
corrective measures, the EE Contractor shall repeat the tests.
If any test cannot be completed because of circumstances that are beyond the
control of the EE Contractor, it shall be properly documented and reported to
the PBSE, who shall then liaise with the relevant parties to resolve the
situation. The EE Contractor shall resume his testing work immediately upon
the attainment of a suitable testing environment.
3.5 Documentation and Deliverables
The EE Contractor shall submit his proposed T&C procedures together with
the Testing and Commissioning Progress Chart shown in Annex I to Annex IV,
where applicable, to PBSE for approval.
All inspection and T&C results shall be recorded by the EE Contractor in the
appropriate test record forms. A set of these forms can be found in Annex I
and Annex III.
Data recorded in other formats may also be acceptable subject to prior approval
of the PBSE. Upon completion of all the required T&C works, the EE
Contractor’s project engineer shall complete and sign the testing and
commissioning certificate as shown in Part 1 and 2 of Annex I and/or Annex III
to the effect that the agreed T&C works have been duly carried out.
Functional test reports covering all measured data, data sheets, and a
comprehensive summary describing the operation of the system at the time of
the functional tests shall be prepared and submitted to the PBSE. Deviations in
performance from the General Specification and/or Particular Specifications or
the design intent should be recorded, with a description and analysis included.
Where required in the General Specification and/or Particular Specification, the
EE Contractor shall conduct a final evaluation of the performance of the
Installations, the results of which shall be included in the commissioning
report.
The EE Contractor shall sign work completion certificate(s) and issue to the
PBSE after completion of the Installations or any work subsequent to repair,
alteration or addition to an existing installation. This should be done before the
installation is energized.
4. Testing and Commissioning (T&C) Procedures
4.1 Tests and Inspections during Construction
For those tests to be carried out on different systems of the Installations during
construction to ensure their suitability for operating at the design conditions,
certificates of such tests shall be issued together with certificates of any work
tests.
The EE Contractor shall submit the details of the tests and inspection during
construction to PBSE for approval on commencement of the installation work.
The tests and inspection shall include, but not limited to, the followings:-
(a) Visual inspection;
(b) Earth electrode resistance; and
(c) Continuity of protective conductor.
Details of these tests shall be in accordance with relevant sections of this T&C
Procedure.
4.2 Statutory Inspection and Test for Low Voltage Installations
4.2.1 Inspection before Test
A visual inspection shall be made to verify that the Installations as
installed is correctly selected and erected in accordance with the COP
Code 21A and COP Appendix 13, and that there is no apparent
damage. The visual inspection shall include a check on the following
items, where appropriate:-
(a) Adequacy of working space, access, and maintenance
facilities;
(b) Connections of conductors;
(c) Identification of conductors;
(d) Adequacy of the sizes of conductor in relation to current
carrying capacity and voltage drop;
(e) Correct connections of all equipment with special attention to
socket outlets, lampholders, isolators, switches, residual
current devices, miniature circuit breakers, and protective
conductors;
(f) Presence of fire barriers and protection against thermal
effects;
(g) Methods of basic protection with live parts (including
measurement of distances where appropriate), i.e. protection
by insulation of live parts, or protection by barriers or
enclosures;
(h) Presence of appropriate devices for isolation and switching;
(i) Choice and setting of protective and indicative devices;
(j) Labelling of circuits, fuses, protective devices, switches,
isolators and terminals;
(k) Selection of equipment and protective measures appropriate to
adverse environmental conditions;
(l) Presence of danger and warning notices;
(m) Presence of diagrams, instructions and other similar
information;
(n) Connection of single pole devices for protection or switching
in phase conductors only;
(o) Method of protection against indirect contact;
(p) Prevention of mutual detrimental influence;
(q) Presence of undervoltage protective devices;
(r) Erection method; and
(s) Any other appropriate inspection as listed in COP Appendix
13.
4.2.2 Sequence of Tests
The following items, where relevant, are to be tested preferably in the
sequence indicated below:-
(a) Continuity of protective conductors, including main and
supplementary equipotential bonding;
(b) Continuity of ring final circuit conductors;
(c) Insulation resistance;
(d) Polarity;
(e) Earth electrode resistance;(f) Earth fault loop impedance;
(g) Functions of all protective devices; and
(h) Functions of all items of equipment.
In the event of any test indicating failure to comply, that test and those
preceding, the results of which may have been influenced by the fault
indicated, shall be repeated after the fault has been rectified.
4.2.3 Conductor Continuity
(a) Continuity of Protective Conductors
The test shall be in accordance with COP Code 21B(3).
Every protective conductor, including all conductors and any
extraneous conductive parts used for equipotential bonding
should be tested for continuity. The test should be made by
connecting together the neutral and protective conductors at
the mains position and checking between earth and neutral at
every outlet by a continuity tester, which should show a
reading near zero.
(b) Continuity of Ring Final Circuit
The test shall be in accordance with COP Code 21B(4).
The ring circuit should be tested from the distribution board.
The ends of the two cables forming the phase conductor
should be separated, and a continuity test should show a
reading near zero between the two; the same tests to be made
between the two cables that form the neutral conductor, and
between the two cables that form the protective conductor.
The testing method in above paragraph is only applicable
when the ring circuit has been inspected throughout, prior to
the test, to ascertain that no interconnection (multi-loops)
exists on the ring circuit. Otherwise, the testing methods
stipulated in Part 3 of the Guidance Note 3 to BS7671, should
be adopted instead.
4.2.4 Insulation Resistance
The test shall be in accordance with COP Code 21B(5).
A suitable direct current (d.c.) insulation resistance tester should be
used to measure insulation resistance. Care should be taken to ensure
that the insulation of the equipment under test could withstand the test
voltage without damage.
The main switchboard and each distribution circuit should be tested
separately. To carry out this test, it is acceptable to divide large
installation into sections with groups of outlets. The term ‘outlet’ in
this case includes every point and every switch. A socket outlet or
appliance or luminaire incorporating a switch is regarded as one outlet.
When measured with all fuse links in place, all switches and circuit
breakers (including, if practicable, the main switch) closed and all
poles or phases of the wiring electrically connected together, the
insulation resistance to earth should not be less than the appropriate
values given in Table 21(1) of COP. For best practice, the insulation
resistance shall not be lower than 1.0 mega ohm for low voltage
installation under a test voltage of d.c. 500V.
When measured between all conductors connected to any one phase or
pole of the supply and, in turn, all conductors connected to each other
phase or pole, the insulation resistance should not be less than the
appropriate values in Table 21(1) of COP. For best practice, the
insulation resistance shall not be lower than 1.0 mega ohm for low
voltage installation under a test voltage of d.c. 500V.
For the sake of enhanced safety, when the value of insulation
resistance measured is near the minimum values as required in this
T&C Procedure, or at a relatively low valves where considered
abnormal to trade’s practice, the concerned circuit /installation shall be
re-checked to improve and re-test shall be conducted afterward.
In carrying out the test:-
(a) wherever practicable, all lamps should be removed and all
current using equipment should be disconnected and all local
switches controlling lamps or other equipment should be
closed;
(b) where the removal of lamps and/or the disconnection of
current using equipment is impracticable, the local switches
controlling such lamps and/or equipment should be open;
(c) electronic devices connected in the installation should be
isolated or short circuited where appropriate so that they are
not damaged by the test voltage; and
(d) where the circuits contain voltage sensitive devices, the test
should measure the insulation resistance to earth with all live
conductors (including the neutral) connected together.
The sequence of test shall be as follows:-
(1) Main switch/switchboard and outgoing circuits with sub-main
switches being isolated;
(2) Sub-main switches/switchboards and outgoing circuits with
final circuits boards being isolated; and
(3) Final circuit boards and final circuits.
Where equipment is disconnected for the test and the equipment has
exposed conductive parts require to be connected to protective
conductors, the insulation resistance between the exposed conductive
parts and all live parts of the equipment should be measured separately
and should have a minimum insulation resistance not less than 1 mega
ohm.
For Site Built Assemblies, the insulation applied to the live parts of
the assemblies for basic protection shall be tested with an applied
voltage equivalent to that specified in the appropriate Regulation
and/or COP for similar factory-built equipment. The supplementary
insulation of Site Built Assemblies for fault protection shall be tested
for degree of protection not less than IP 2X, and the insulation
enclosure shall be tested with an applied voltage equivalent to that
specified in the appropriate Regulation and/or COP for similar factory built
equipment.
4.2.5 Polarity
The test shall be in accordance with COP Code 21B(6).
A test of polarity should be carried out to verify that:-
(a) every fuse and single-pole control and protective device is
connected in the phase conductor only;
(b) centre-contact bayonet and Edison-type screw lampholders to
IEC 60238 in circuits having an earthed neutral conductor,
have their outer or screwed contacts connected to that neutral
conductor; and
(c) wiring has been correctly connected to socket outlets and
similar accessories.
4.2.6 Earth Electrode Resistance
The test shall be in accordance with COP Code 21B(7).
A proper earth electrode resistance tester should be used to measure
earth electrode resistance. An alternating current at 50 Hz of a steady
value is passed between the earth electrode T and an auxiliary earth
electrode T1 placed at a separation distance recommended by the
manufacturer of the tester but in any case should not be less than 20
metres away. A second auxiliary earth electrode T2, which may be a
metal spike driven into the ground, is then inserted half-way between
T and T1, and the voltage drop between T and T2, divided by the
current flowing between T and T1, gives a measured earth electrode
resistance of earth electrode T.
For an electrical installation having four or more earth electrodes
which are installed more or less in line, following a general direction
not exceeding 15° deviation and with separation between adjacent
electrodes not less than the recommended distance by the
manufacturer of the tester but in any case not less than 20 metres,
these electrodes can be used in turn as the auxiliary electrodes for the
purpose of measuring the earth electrode resistances.
The following alternative method for measuring the earth electrode
resistance may be used if the electricity supply is connected. A loop
impedance tester should be connected between the phase conductor at
the origin of the installation and the earth electrode with the test link
open, and a test performed. This impedance reading could be treated
as the electrode resistance.
4.2.7 Earth Fault Loop Resistance
The test shall be in accordance with COP Code 21B(8).
The earth fault loop impedance should be measured by a phase-earth
loop tester with a scale calibrated in ohms.
The earth fault loop impedance should not exceed the requirements of
COP Code 11.
Before the test begins, it is essential to establish, by inspection, that
the earthing conductor and all relevant earth connections are in place,
and that the bonding connection to electricity supplier’s earthing
facilities is disconnected. Measures should be taken, during the
impedance tests especially when the earth leakage protective devices
are effectively removed for the duration of the tests, to ensure that the
installation is not being used other than by person(s) carrying out the
tests.
4.2.8 Functions of All Devices including Protective Devices
The test shall be in accordance with COP Code 21B(9).
Functional Test of Residual Current Device (RCD):-
(a) Function of residual current devices should be checked by a
residual current device tester simulating an earth fault in
order to verify its effective operation. The in-built test button
should also be tested for proper functioning. One of the
testing methods is specified in subparagraph (b) and (c)
below. Other testing methods complying with relevant
national and/or international standards are also acceptable.
(b) The test should be made on the load side of the RCD between
the phase conductor of the protected circuit and the associated
circuit protective conductor. The load should be
disconnected during the test.
(c) For general purpose RCDs to IEC 61008 or RCBOs to IEC
61009, with a leakage current flowing equivalent to 50% of
the rated tripping current of the RCD, the device should not
open. When a leakage current is flowing equivalent to 100%
of the rated tripping current of the RCD, the device should
open in less than 300 ms unless it is of ‘Type S’ (or selective)
which incorporates an intentional time delay, when it should
trip within the time range from 130 ms to 500 ms.
Function of other protective devices, such as miniature circuit
breakers, moulded case circuit breakers, air circuit breakers, fused
switches, switch-fuses and protective relays etc. should be checked by
hand operation as appropriate.
Function of all items of equipment such as isolators, switches and
indicative devices should be checked by hand operation.
Secondary Injection Test
(a) The overload and fault current protection characteristics of
protection relays should be verified with secondary injection
test.
(b) The test should be carried out by injecting a.c. of different
magnitudes into the relay terminals and measuring the relay
operating time. The operating time should be checked
against the manufacturer’s data sheet.
4.2.9 Additional Check for Installation in Hazardous Environment
The following additional check, where appropriate, shall be carried out
for installations in hazardous environment in accordance with COP
Code 21B(10):-
(a) Where appropriate, the area involved should be checked to
ensure ‘gas free’ condition before insulation and earth fault
loop impedance test are carried out.
(b) All equipment should be suitably protected according to the
types of protection under COP Code 15. The integrity of the
type of protection provided for the equipment should not be
jeopardised by the method of installation. No alteration that
may invalidate the conditions of protection can be used.
(c) Equipment should be kept clean and free from accumulation
of dust, foreign particles and deleterious substances.
Equipment is kept free from condensation.
(d) All lamps, fuses and replaceable parts should be checked so
that correct rating and types are being used.
(e) The surface temperature of all equipment should be
appropriate to the type of protection being provided.
4.3 Statutory Inspection and Test for High Voltage Installations
4.3.1 Inspection before Test
The inspection shall be in accordance with COP Code 21C.
Inspection of H.V. installations should follow those for L.V.
installations listed in section 4.2 of this T&C Procedure with
additional checks on the following items where relevant:-
(a) provision of suitable locking facilities for every entry to an
H.V. switchroom/substation;
(b) continuity of protective conductors especially the bonding of
all exposed conductive parts; and
(c) provision of padlock facilities for shutters, key boxes etc.
4.3.2 Safety
Precautionary measures should be taken and the methods of tests
should be such that no danger to persons or property can occur even if
the circuit being tested is defective.
Before carrying out the T&C for high voltage installations, the EE
Contractor shall submit risk assessment, safety plan and
implementation procedure to PBSE for approval.
4.3.3 Testing Requirements
Testing for High Voltage installations should be referred to relevant
recognized standards, manufacturers’ recommendation, operations and
maintenance instructions.
The EE Contractor shall responsible to submit a full T&C plan with
inspection and test details to PBSE for approval.
4.4 Functional Test of System /Equipment
4.4.1 Lightning Protection System
The whole lightning protection system shall be tested for continuity
between air terminations and earthing terminations and the resistance
shall be recorded.
The earth termination resistance shall be tested and recorded. Each
earth termination shall have a resistance to earth not exceeding the
product given by 10 ohms times the number of earth terminations to
be provided. The whole of the lightning protection system shall have
a combined resistance to earth not exceeding 10 ohms.
Where the steel work of the structure is used as down conductor, the
continuity of the steel work shall be tested and recorded.
Locations of all earth electrodes and down tape routing shall be
checked to be clear of any dangerous goods store, diesel tanks and
inflammable stores, etc.
All connections at terminations, tee off points and earth electrodes
shall be checked for tightness.
4.4.2 Circuitry Check
All circuits shall be verified through switching operation to ensure that
the circuits are installed in accordance with the designated circuit. The
tests shall include but not be limited to the following:-
(a) on/off switching of the lighting circuit to ensure that the
lighting circuit is installed corresponding to the lighting
switch, protective device and labelling;
(b) switching of the general power circuit to ensure that the
circuit corresponds to the protective device such as RCD,
RCBO and MCB, and that the protective device performs in
accordance with the designated duty;
(c) switching of the main switch/isolator to ensure the
corresponding circuit is properly controlled by the main
switch/isolator;
(d) switching of all sub-main and main distribution circuits, e.g.
busducts, cable feeders, underground cables, etc. to ensure the
correct isolation of the connected circuit;
(e) switching of all changeover switches to ensure the changing
over sequence corresponds to the design criteria; and
(f) ensuring all the protective devices perform properly against
the designated circuit.
4.4.3 Charger and Battery Set
The following inspections and tests shall be carried out after
completion of the installation of the respective system and the
connection of the permanent supply cable:-
(a) inspection of the charger for correct connection to the mains
supply through a suitable rated fuse;
(b) inspection of the batteries proper connections;
(c) inspection of instruments, indicating lamps, fuses, relays and
labels on battery charger;
(d) for initial set-up, the batteries shall be charged at the manual
highest rate until the charging current remains constant. The
starting and finishing time are recorded. The capacity of
charger is checked for capability of recharging the batteries
from fully discharged to fully charged within the specified
duration;
(e) the charger output on load with batteries disconnected shall
be measured. This should be between 110% and 115% of the
normal batteries voltage and within the operating voltage
limits of all connected devices;
(f) the charger current on load with battery disconnected shall be
measured. This should be less than the maximum
recommended continuous charge current for the batteries;
(g) on interruption of mains input to the charger, the proper
operation of connected devices on standby batteries shall be
checked. In the case of switch tripping in Switchboard, mains
input shall be interrupted to check whether the capacity of the
batteries is adequate to trip the associated air circuit breaker
consecutively at least 20 times or up to twenty air circuit
breakers simultaneously, whichever the greater; and
(h) the correct function of charger fail/mains fail/battery
disconnected/boost charge/trickle charge indications as
specified shall be checked.
4.4.4 Lighting Installation
Lighting installation shall be tested in terms of its light quality and
control as following:-
(a) Before carrying out the lighting measurement and test, all
Page 15 of 24
EE_TCP
2012 Edition
luminaries shall be checked against the specified colour
temperature, beaming angle of spot lamp and aiming angle
for exterior floodlights.
(b) The aiming angle of external lighting or planter lighting shall
be commissioned so as not to create glare or any obstructive
light to external environment and neighbourhood building
users.
(c) Before commissioning and/or setting of lighting control
devices which including but not limited to timer switch,
occupancy sensor, photocell and infra-red sensor, the EE
Contractor shall submit commissioning/setting proposal to
PBSE for approval.
(d) Illumination level of lighting installation for individual
areas/rooms shall be measured to verify the light output. The
EE Contractor shall submit the proposed locations and height
levels for carrying out the measurement of illuminance level
to PBSE for approval before commencement of
measurement. Presentation of the measurement result shall
be in the form of marked up layout plan for the particular
area.
(e) Base on the measured illuminance results for individual
areas/rooms, the lighting uniformity of the respective
areas/rooms shall be evaluated in terms of minimum to
average illuminance ratio and/or any other uniformity ratio as
required by the PBSE.
(f) All grouping of luminaries shall be tested by hand operation
of the corresponding switches or timers.
(g) For lighting installation with interface connection to building
management system (BMS), or central control and
monitoring system (CCMS) or similar central computer
control system, the EE Contractor shall co-ordinate with other
contractors responsible for such computer control system, if
required, to demonstrate proper control function of the
lighting installation.
(h) For luminaries controlled by occupancy sensor, the ‘on’ and
‘off’ of luminaries shall be tested to demonstrate the function
of occupancy sensors.
(i) Luminaires controlled by daylight sensor shall be tested to
demonstrate the dimming function in maintaining lighting
level within the preset range of illumination.
4.4.5 Digital Multifunction Power Meter
The digital multifunction power meter shall be tested to verify the
measurement, recording and interfacing functions as required in the
General Specification.
Prior to the test for every digital multifunction power meter, the EE
Contractor shall provide manufacturer’s calibration certificate for each
meter for checking on the accuracy.
The EE Contractor shall provide testing kit to verify the reading
accuracy of the digital multifunction power meter.
For installation of digital multifunction power meter with connection
to building management system (BMS), or central control and
monitoring system (CCMS) or similar central computer monitoring
system, the EE Contractor shall co-ordinate with other contractor
responsible for such computer monitoring system, if required, to
demonstrate proper functioning and interfacing of the meter.
For installation of digital multifunction power meter without external
connection to BMS or CCMS, the interface functions including digital
and analogue output shall be tested by means of plugging in
communication module provided by the EE Contractor.
The replacement mechanism of the meter shall be tested. The test
shall demonstrate that the replacement of the meter does not require
the switching off of the respective switchgear. Current transformers
shorting block to prevent open circuiting the current transformers shall
also be tested.
4.4.6 Digital Power Analyzer
The testing requirement for digital power analyser shall be in
accordance to section 4.4.5.
In addition to test requirement as stipulated in section 4.4.5, the event
alarm function and waveform capture function of the digital power
analyser shall also be tested. The EE Contractor shall propose
simulated test method for PBSE’s approval.
4.4.7 Busbar Trunking System
In general, busbar trunking system shall be certified by testing
laboratories or organizations as stated in the COP. It shall be type
tested in accordance with Clause 8.1.1 of IEC 60439-2. The
Certificate on verification of short-circuit strength shall be carried out
by an Independent Short Circuit Testing Organization.
Short-circuit test on the phase and neutral busbars shall be carried out
in accordance with Clause 8.2.3 of IEC 60439-1 to the value of shortPage
17 of 24
EE_TCP
2012 Edition
circuit current specified in the General Specification.
The busbar insulation shall be tested in accordance with Clause 8.2.2
of IEC 60439-1. All test certificates shall be presented during
inspection and testing.
The busbar trunking system shall also be tested to verify its continuity,
insulation resistance, polarity, earth fault loop impedance and other
parameters as appropriate after installation.
For installation of busbar trunking with long run, phase transposition
of busbar in accordance with manufacturer’s recommendation shall be
checked.
Plug-in tap-off unit of busbar trunking system shall be tested to verify
proper and safe operation. Mechanical interlock, quick fastening and
quick releasing mechanism of the tap-off unit shall be tested. Positive
earth connection of tap-off unit shall be checked.
After power energization of the busbar trunking system, infrared
scanning at connecting joints shall be carried out to check for
abnormal rise in temperature at joints. The EE Contractor shall
submit proposal of the test methodology and propose testing points for
PBSE approval prior to the test.
4.4.8 Equipment and Appliances
Testing on electrical equipment and appliances supplied within the
electrical installation, e.g. meters, fans, etc. shall be carried out in
accordance with the relevant sections of other Building Services
Branch Testing and Commissioning Procedures for other building
services installations and manufacturer’s recommended testing
procedures.
4.4.9 Voltage Dip Ride-through Device
For equipment installed with voltage dip ride-through device, the EE
Contractor shall submit testing methodology and testing instrument to
PBSE for approval to demonstrate the device can comply with the
voltage dip requirements in the Specification.
4.4.10 Harmonic Correction Device
For circuits installed with harmonic correction device, the EE
Contractor shall submit test methodology and measuring instrument to
PBSE for approval to demonstrate the device can comply with the
requirements on elimination of harmonic currents in the Specification
to meet the Total Harmonic Distortion (THD) requirements in the
BEC.
The measuring points shall be selected as close as possible to the
harmonic generating equipment, e.g. the distribution board or isolator
feeding the harmonic generating equipment. For three phase harmonic
generating equipment, the THD current of each phase shall be
measured and recorded concurrently. Under some circumstances, the
THD of the circuits feeding the harmonic generating equipment should
be measured for a sufficient long period of time in order to provide an
accurate and representative of the maximum THD value. The period
of measurement shall be agreed with PBSE.
4.4.11 Any Other Tests that are Considered Necessary to Meet the Design
Intent
For any other system /equipment that are not covered by this T&C
Procedure, the EE Contractor shall submit full details of testing
requirements as recommended by the relevant manufacturer to PBSE
for approval.
4.5 Assessment of Any Characteristics of Equipment Likely to have Harmful
Effects
Before carrying out the T&C, the EE Contractor shall conduct assessment for
any characteristics of equipment likely to have harmful effects upon other
electrical equipment or other services, or impair the supply. Those
characteristics include the following:-
(a) Overvoltages;
(b) Undervoltages;
(c) Fluctuating loads;
(d) Unbalanced loads;
(e) Power factor;
(f) Starting currents;
(g) Harmonic currents;
(h) Direct current (d.c.) feedback;
(i) High frequency oscillations; and
(j) Necessity for additional connection to earth.
The EE Contractor shall, after conduct the assessment, submit an assessment
report to PBSE for consideration.
Page 19 of 24
EE_TCP
2012 Edition
4.6 Test and Inspection for Low Voltage Cubicle Switchboard (LVSB)
The following sections stipulate the additional inspection and testing
requirements for LVSB installation. For comprehensive testing and
commissioning, the EE Contractor shall also refer to relevant sections of this
T&C Procedure and carry out inspection /test accordingly.
4.6.1 Visual Inspection
Visual inspection shall be carried out for the proper installation of the
LVSB Installation in accordance with the Specification. The
following components shall be included:-
(a) construction of type tested assembly;
(b) main busbars and droppers/risers;
(c) air circuit breakers/fuse switches;
(d) power factor correction capacitor bank;
(e) harmonic filter;
(f) automatic changeover switch;
(g) instrumentation and protection devices;
(h) incoming/outgoing busbars and cables;
(i) portable earthing equipment;
(j) operating handles/keys;
(k) hydraulic truck; and
(l) rubber insulation mat.
4.6.2 Site Test before Connection of Incoming Supply
The following tests shall be carried out on the Site after completion of
installation of the LVSB and before the connection of the incoming
supply cable:-
(a) Dielectric Test
Dielectric test shall be carried out to verify the dielectric
properties of the LVSB. The test requirements shall be in
accordance with IEC 60439-1.
(b) Insulation Test
Page 20 of 24
EE_TCP
2012 Edition
This shall be carried out by means of a 1000V insulation
tester or similar instrument.
(c) Secondary Injection Test
This shall be carried out using a.c. and shall check
(approximately) that protection relays or devices function in
accordance with their performance curves by a test at the
lowest setting and two further tests of current and timing.
(d) Primary Injection Test
This shall be carried out to prove the correct operation of
protective devices or system when set at the agreed setting.
(e) Polarity Check for Current Transformer (C.T.)
This shall be carried out to ensure that all C.T. are correctly
connected.
(f) Functional Test of All Devices
This shall be carried out to ensure that all devices can operate
properly as intended.
The equipment to be tested shall include, but not limited to,
all circuit breakers, isolating switches, changeover switches,
contactors, interlocking facilities, protective relays, earth
leakage tripping devices, metering facilities and instruments.
(g) Contact Resistance Test
This shall be carried out by means of "Ductor" tester or
similar instrument to ensure that contacts and joints for
switchgears, cables, busbars as well as the contacts and joints
for outgoing cables and busbars are maintained in good
condition.
(h) Temperature Rise Limits Test
This shall be carried out as defined in IEC 60439-1.
With the prior approval by the PBSE, the primary injection test and
temperature rise limits test can be carried out in factory due to site
constraints.
4.6.3 Site Test After Connection of Incoming Supply
The following tests shall be carried out after the incoming supply
cables are connected and the LVSB successfully commissioned on no
Page 21 of 24
EE_TCP
2012 Edition
load:-
(a) phase-to-phase voltage test;
(b) phase-to-neutral voltage test;
(c) phase-to-earth voltage test;
(d) neutral-to-earth voltage test; and
(e) phase sequence test on each and every outgoing circuit.
4.7 Power Energization
4.7.1 Notification of Completion
After the proper testing and commissioning of the electrical
installation, the EE Contractor shall notify the appropriate Authority,
through the PBSE, on the completion of the installation and its
readiness for inspection and testing.
4.7.2 Preliminary Steps for Power Energization
The followings shall be checked before power energization:-
(a) busbar chambers, main and sub-main switch connections, i.e.
bolts and nuts tightness;
(b) earthing connections at compartments, all switches and earth
electrodes;
(c) clearance of live parts from direct contact with or any
likelihood of contact with tools, spurious bare conductors
remaining in switches, air circuit breakers (ACB) and switch
cubicles;
(d) polarity, phase sequence of all switches and relevant fuse
ratings;
(e) stand-by battery supply and the operation of shunt trip
mechanism;
(f) settings of overcurrent, earth fault relays and current
transformer (C.T.) polarity;
(g) vacuum cleaning of switches and ACBs;
(h) provision of danger and warning signs; and
(i) certified Work Completion Certificate in accordance to the
Page 22 of 24
EE_TCP
2012 Edition
requirement of COP Code 19.
4.7.3 Switch On Process
Whenever there is any break of time, e.g. the next day, in carrying out
the switch on process, re-test of insulation resistance is required. The
following procedures shall be followed in the switch on process:-
(a) switch on the main switch/ACB with all other sub-main
switches off;
(b) if normal, switch on other sub-main switches one by one with
all other outgoing switches off;
(c) if normal, then switch on all other out-going switches one by
one;
(d) observe the disc of the overcurrent and earth fault protection
relays for any movement for IDMT relays or for digital
protection relays check whether there are any fault
indications; and
(e) keep vigilance for about 30 minutes to see if any smell or
abnormal noise being generated.
4.8 Verification of Electrical Installation and Lighting Installation for
demonstration of Compliance with the Building Energy Code (BEC)
After notification of completion of the Installations, the EE Contractor shall
verify and record the electrical and lighting installation on the Site with PBSI
and then submit the records to PBSE for his/her consolidation to demonstrate
compliance of the electrical and lighting installation with the BEC. The
requirements are:-
4.8.1 Power Distribution Loss (clause 7.4 of BEC)
The cabling route and cable size of the following circuits shall be
verified with PBSI on the Site. Base on the verified cable route, the
EE Contractor shall submit the cable length and size to PBSE:-
(a) Main circuit connecting the distribution transformer and the
main incoming circuit breaker of the LVSB if the transformer
room and the main switch room is not adjacent to each other
(clause 7.4.2 of BEC) ;
(b) Feeder circuits (clause 7.4.3 of BEC);
(c) Submain circuits (clause 7.4.4 of BEC) ; and
(d) Final circuits with rating of circuit protective device over 32A
Page 23 of 24
EE_TCP
2012 Edition
(clause 7.4.5 of BEC).
4.8.2 Motor Installation (clause 7.5 of BEC)
The relevant BS Contractors responsible for installing the motors shall
submit the following information of every installed motor to PBSE if
such motor does not form an integral part of an equipment or
installation fulfilling electrical power or equipment efficiency
requirement under relevant clauses of the BEC:-
(a) Application & designation number (e.g. motor for chilled
water pump);
(b) Motor rated output (in kW);
(c) Manufacturer and model number;
(d) 2-pole or 4-pole; and
(e) Full-load motor efficiency (%)
4.8.3 Power Quality (clause 7.6 of BEC)
Total Power Factor (clause 7.6.1 of BEC)
(a) If power factor correction device is not provided to circuit
connecting to the meter of the electricity supplier or circuit at
400A or above, single or three phase, (based on circuit
protective device rating and not applicable to circuit of lift &
escalator installation), the EE Contractor shall verify a spare
way of appropriate rating has been reserved at the local
distribution board or source motor control centre for the
future installation of power factor correction device (clause
7.6.1.3 of BEC).
Total Harmonic Distortion (clause 7.6.2 of BEC)
(a) If harmonic correction device is not provided to circuit
connecting to the meter of the electricity supplier or circuit at
400A or above, single or three phase, (based on circuit
protective device rating and not applicable to circuit of lift &
escalator installation), the EE Contractor shall verify a spare
way of appropriate rating has been reserved at the local
distribution board or source motor control centre for the
future installation of harmonic correction device. (clause
7.6.2.3 of BEC)
(b) The EE Contractor shall measure the harmonic current to
demonstrate maximum 5th harmonic current distortion is less
than 35% at the VSD input terminals during normal operation
within the variable speed range if group compensation at the
Page 24 of 24
EE_TCP
2012 Edition
motor control centre or local distribution board is provided.
(clause 7.6.2.4 of BEC)
4.8.4 Metering and Monitoring Facilities (clause 7.7 of BEC)
The installed metering and monitoring facilities shall be verified to
demonstrate the compliance with the minimum requirements in BEC:-
(a) Main circuit, feeder and submain circuit exceeding at or
above 400A – metering device is installed to measure
‘voltage’, ‘current’, ‘total power factor’, ‘total energy
consumption’, ‘maximum demand’ and ‘total harmonic
distortion’ (clause 7.7.1 & 7.7.3 of BEC); and
(b) Feeder and submain circuit exceeding 200A and below
400A – metering device is installed to measure ‘current’ and
‘total energy consumption’ (clause 7.7.2 of BEC)
4.8.5 Lighting Power Density (clause 5.4 of BEC)
The EE Contractor shall submit the following information for
verification of the installed lighting power density (LPD):- (clause
5.4.1 of BEC)
(a) Data of installed luminaries – circuit wattage of each type of
luminaire;
(b) Number and type of luminaires installed in each space; and
(c) Floor area of each space where luminaires were installed.
4.9 Calibrated Equipment
4.9.1 The EE Contractor shall supply the calibrated equipment relevant for
T&C of the Installations as stipulated in the Particular Specification of
the contract or the General Specification whichever appropriate. The
equipment shall be calibrated by the recognized laboratories accredited
with the Hong Kong Laboratory Accreditation Scheme (HOKLAS) or
other worldwide-recognised laboratories during the active period of
the contract.
4.9.2 A list of equipment proposed by the EE Contractor to be used for
T&C must be agreed with the PBSE prior to T&C. All equipment
requiring periodic calibration shall have this carried out before the
work commences. Data sheets of such testing instrument showing
manufacturer’s name, model number, latest date of calibration and
correction factors shall be submitted to the PBSE for record. If any
item requires re-checking the accuracy because of the time that has
elapsed since the previous calibration, this shall be carried out prior to
commencing the work.
Electrical Installation
1. Introduction
The procedures stated in this T&C Procedure cover the activities in preliminary tests
and inspections, functional performance tests and the commissioning of newly
completed installations and existing ones after major alteration. They are so compiled
to facilitate the work of Project Building Services Engineer (PBSE) and Project
Building Services Inspector (PBSI), who are appointed as the Architect’s
Representatives, in the following aspects with respect to testing and commissioning
(T&C):-
(i) To vet and approve the T&C procedures proposed and submitted by the
contractor for the Electrical Installation (EE Contractor);
(ii) To witness those T&C procedures as specified; and
(iii) To accept the T&C certificates and other supporting data.
The EE Contractor shall carry out the T&C works as detailed in this T&C Procedure.
Supplementary T&C plans may be proposed by the EE Contractor as appropriate and
agreed by PBSE, e.g. for special equipment supplied and/or installed by the EE
Contractor.
The administrative requirements for T&C works are in general as specified in the
General Specification for Electrical Installation 2012 Edition and all current
corrigenda/amendments thereto published before the date of first tender invitation for
the Contract issued by the ArchSD (the General Specification).
All words and expressions shall have the meaning as assigned to them under the
General Specification unless otherwise specified herein.
“Major Alteration” of an existing electrical installation means alteration involving work
on any distribution board or electrical equipment having an electrical current rating
exceeding 100A single phase or 60A three phases in an existing electrical installation.
This T&C Procedure is also intended to lay down the minimum testing and
commissioning requirements to be carried out by the EE Contractor on a new Low
Voltage Cubicle Switchboard Installation upon completion or on an existing Low
Voltage Cubicle Switchboard Installation after a major alteration involving
modification of the main busbar such as upgrading, reposition and extension.
This T&C Procedure also covers the verification of the electrical installation and
lighting installation to demonstrate the compliance with the Building Energy Code
(hereinafter named as BEC) issued under the Building Energy Efficiency Ordinance
(Cap.610). The EE Contractor is required to check, measure and submit the required
information to PBSE for his/her consolidation to verify the design in compliance with
the BEC.
2. Objectives of the Testing and Commissioning (T&C) Works
The objectives of the T&C works are:-
(i) To verify proper functioning of the equipment/system after installation;
(ii) To verify that the performance of the installed equipment/systems meet with
the specified design intent or statutory requirements through a series of tests,
measurements and adjustments; and
(iii) To capture and record performance data of the whole installation as the
baseline for future operation and maintenance.
For the avoidance of doubt, depending on the specific demands of individual
installation, the PBSE may require additional or substitute T&C works in regard to any
elements in the installation other than those indicated in this T&C Procedure.
3. Scope of the Testing and Commissioning (T&C) Works
3.1 Preliminary Steps for Testing and Commissioning
Before carrying out T&C, the EE Contractor shall take the following steps:-
(a) Submit draft T&C procedures to the PBSE for approval. The draft
T&C procedures shall include essential procedures mentioned in this
T&C Procedure plus additional T&C procedures required for specific
installations as well as manufacturer’s recommendation;
(b) Obtain design drawings and specifications and to be thoroughly
acquainted with the design intent;
(c) Obtain copies of approved shop drawings and equipment schedules;
(d) Review approved shop drawings and equipment schedules;
(e) Check manufacturer’s operating instructions and statutory
requirements;
(f) Physically inspect the installation and equipment to determine
variations from designs and/or specifications;
(g) Check individual components, e.g. key switches, control equipment,
circuit breaker status, etc. for proper position and settings for
completeness of installation; and
(h) Check inclusion of manufacturer’s typical equipment testing data or
factors before T&C of particular equipment
3.2 Testing and Inspection during Construction
The purpose of these tests is to ensure that all components and systems are in a
satisfactory and safe condition before start up. Preliminary adjustment and
setting of equipment at this stage shall also be carried out at the same time to
pave way for the coming functional performance tests.
Before carrying out any test, the EE Contractor shall ensure that the Electrical
Installation (the Installations) complies with all relevant statutory requirements
and regulations. The T&C works shall also comply with all site safety
regulatory requirements currently in force. In particular, the EE Contractor
shall note the following:-
(a) Electricity Ordinance (Cap.406), and other subsidiary legislation made
under the Ordinance;
(b) Code of Practice for the Electricity (Wiring) Regulations published by
the EMSD (hereinafter named as COP);
(c) Occupational Safety and Health Ordinance (Cap.509), and other
subsidiary legislation made under the Ordinance;
(d) Factories and Industrial Undertakings Ordinance (Cap.59), and other
subsidiary legislation made under the Ordinance, including but not
limited to Construction Site (Safety) Regulations; and
(e) Electricity supply rules of the relevant power supply companies.
3.3 Statutory Test and Inspection
The statutory test and inspection herein stated in this T&C Procedure shall
refer to the Regulations Nos. 19, 20, 21 and 22 of the Electricity (Wiring)
Regulations (Cap.406E) under the Electricity Ordinance (Cap.406).
3.4 Functional Performance Tests
The purpose of functional performance tests is to demonstrate that the
Installations can meet the functional and performance requirements as specified
in the General Specification and/or Particular Specification. Functional
performance tests should proceed from the testing of individual components to
the testing of different systems in the Installations.
The EE Contractor may have to make temporary modifications as the tests
proceed. The specific tests required and the order of tests will vary depending
on the type and size of systems, number of systems, sequence of construction,
interface with other installations, relationship with the building elements and
other specific requirements as indicated in the General Specification and/or
Particular Specification. The testing of systems may have to be carried out in
stages depending on the progress of work or as proposed by the EE Contractor.
Part of the tests may be required to be carried out in suppliers’ premises in
accordance with the provisions in the General Specification and/or Particular
Specification.
Any performance deficiencies revealed during the functional performance tests
must be evaluated to determine the cause. After completion of the necessary
corrective measures, the EE Contractor shall repeat the tests.
If any test cannot be completed because of circumstances that are beyond the
control of the EE Contractor, it shall be properly documented and reported to
the PBSE, who shall then liaise with the relevant parties to resolve the
situation. The EE Contractor shall resume his testing work immediately upon
the attainment of a suitable testing environment.
3.5 Documentation and Deliverables
The EE Contractor shall submit his proposed T&C procedures together with
the Testing and Commissioning Progress Chart shown in Annex I to Annex IV,
where applicable, to PBSE for approval.
All inspection and T&C results shall be recorded by the EE Contractor in the
appropriate test record forms. A set of these forms can be found in Annex I
and Annex III.
Data recorded in other formats may also be acceptable subject to prior approval
of the PBSE. Upon completion of all the required T&C works, the EE
Contractor’s project engineer shall complete and sign the testing and
commissioning certificate as shown in Part 1 and 2 of Annex I and/or Annex III
to the effect that the agreed T&C works have been duly carried out.
Functional test reports covering all measured data, data sheets, and a
comprehensive summary describing the operation of the system at the time of
the functional tests shall be prepared and submitted to the PBSE. Deviations in
performance from the General Specification and/or Particular Specifications or
the design intent should be recorded, with a description and analysis included.
Where required in the General Specification and/or Particular Specification, the
EE Contractor shall conduct a final evaluation of the performance of the
Installations, the results of which shall be included in the commissioning
report.
The EE Contractor shall sign work completion certificate(s) and issue to the
PBSE after completion of the Installations or any work subsequent to repair,
alteration or addition to an existing installation. This should be done before the
installation is energized.
4. Testing and Commissioning (T&C) Procedures
4.1 Tests and Inspections during Construction
For those tests to be carried out on different systems of the Installations during
construction to ensure their suitability for operating at the design conditions,
certificates of such tests shall be issued together with certificates of any work
tests.
The EE Contractor shall submit the details of the tests and inspection during
construction to PBSE for approval on commencement of the installation work.
The tests and inspection shall include, but not limited to, the followings:-
(a) Visual inspection;
(b) Earth electrode resistance; and
(c) Continuity of protective conductor.
Details of these tests shall be in accordance with relevant sections of this T&C
Procedure.
4.2 Statutory Inspection and Test for Low Voltage Installations
4.2.1 Inspection before Test
A visual inspection shall be made to verify that the Installations as
installed is correctly selected and erected in accordance with the COP
Code 21A and COP Appendix 13, and that there is no apparent
damage. The visual inspection shall include a check on the following
items, where appropriate:-
(a) Adequacy of working space, access, and maintenance
facilities;
(b) Connections of conductors;
(c) Identification of conductors;
(d) Adequacy of the sizes of conductor in relation to current
carrying capacity and voltage drop;
(e) Correct connections of all equipment with special attention to
socket outlets, lampholders, isolators, switches, residual
current devices, miniature circuit breakers, and protective
conductors;
(f) Presence of fire barriers and protection against thermal
effects;
(g) Methods of basic protection with live parts (including
measurement of distances where appropriate), i.e. protection
by insulation of live parts, or protection by barriers or
enclosures;
(h) Presence of appropriate devices for isolation and switching;
(i) Choice and setting of protective and indicative devices;
(j) Labelling of circuits, fuses, protective devices, switches,
isolators and terminals;
(k) Selection of equipment and protective measures appropriate to
adverse environmental conditions;
(l) Presence of danger and warning notices;
(m) Presence of diagrams, instructions and other similar
information;
(n) Connection of single pole devices for protection or switching
in phase conductors only;
(o) Method of protection against indirect contact;
(p) Prevention of mutual detrimental influence;
(q) Presence of undervoltage protective devices;
(r) Erection method; and
(s) Any other appropriate inspection as listed in COP Appendix
13.
4.2.2 Sequence of Tests
The following items, where relevant, are to be tested preferably in the
sequence indicated below:-
(a) Continuity of protective conductors, including main and
supplementary equipotential bonding;
(b) Continuity of ring final circuit conductors;
(c) Insulation resistance;
(d) Polarity;
(e) Earth electrode resistance;(f) Earth fault loop impedance;
(g) Functions of all protective devices; and
(h) Functions of all items of equipment.
In the event of any test indicating failure to comply, that test and those
preceding, the results of which may have been influenced by the fault
indicated, shall be repeated after the fault has been rectified.
4.2.3 Conductor Continuity
(a) Continuity of Protective Conductors
The test shall be in accordance with COP Code 21B(3).
Every protective conductor, including all conductors and any
extraneous conductive parts used for equipotential bonding
should be tested for continuity. The test should be made by
connecting together the neutral and protective conductors at
the mains position and checking between earth and neutral at
every outlet by a continuity tester, which should show a
reading near zero.
(b) Continuity of Ring Final Circuit
The test shall be in accordance with COP Code 21B(4).
The ring circuit should be tested from the distribution board.
The ends of the two cables forming the phase conductor
should be separated, and a continuity test should show a
reading near zero between the two; the same tests to be made
between the two cables that form the neutral conductor, and
between the two cables that form the protective conductor.
The testing method in above paragraph is only applicable
when the ring circuit has been inspected throughout, prior to
the test, to ascertain that no interconnection (multi-loops)
exists on the ring circuit. Otherwise, the testing methods
stipulated in Part 3 of the Guidance Note 3 to BS7671, should
be adopted instead.
4.2.4 Insulation Resistance
The test shall be in accordance with COP Code 21B(5).
A suitable direct current (d.c.) insulation resistance tester should be
used to measure insulation resistance. Care should be taken to ensure
that the insulation of the equipment under test could withstand the test
voltage without damage.
The main switchboard and each distribution circuit should be tested
separately. To carry out this test, it is acceptable to divide large
installation into sections with groups of outlets. The term ‘outlet’ in
this case includes every point and every switch. A socket outlet or
appliance or luminaire incorporating a switch is regarded as one outlet.
When measured with all fuse links in place, all switches and circuit
breakers (including, if practicable, the main switch) closed and all
poles or phases of the wiring electrically connected together, the
insulation resistance to earth should not be less than the appropriate
values given in Table 21(1) of COP. For best practice, the insulation
resistance shall not be lower than 1.0 mega ohm for low voltage
installation under a test voltage of d.c. 500V.
When measured between all conductors connected to any one phase or
pole of the supply and, in turn, all conductors connected to each other
phase or pole, the insulation resistance should not be less than the
appropriate values in Table 21(1) of COP. For best practice, the
insulation resistance shall not be lower than 1.0 mega ohm for low
voltage installation under a test voltage of d.c. 500V.
For the sake of enhanced safety, when the value of insulation
resistance measured is near the minimum values as required in this
T&C Procedure, or at a relatively low valves where considered
abnormal to trade’s practice, the concerned circuit /installation shall be
re-checked to improve and re-test shall be conducted afterward.
In carrying out the test:-
(a) wherever practicable, all lamps should be removed and all
current using equipment should be disconnected and all local
switches controlling lamps or other equipment should be
closed;
(b) where the removal of lamps and/or the disconnection of
current using equipment is impracticable, the local switches
controlling such lamps and/or equipment should be open;
(c) electronic devices connected in the installation should be
isolated or short circuited where appropriate so that they are
not damaged by the test voltage; and
(d) where the circuits contain voltage sensitive devices, the test
should measure the insulation resistance to earth with all live
conductors (including the neutral) connected together.
The sequence of test shall be as follows:-
(1) Main switch/switchboard and outgoing circuits with sub-main
switches being isolated;
(2) Sub-main switches/switchboards and outgoing circuits with
final circuits boards being isolated; and
(3) Final circuit boards and final circuits.
Where equipment is disconnected for the test and the equipment has
exposed conductive parts require to be connected to protective
conductors, the insulation resistance between the exposed conductive
parts and all live parts of the equipment should be measured separately
and should have a minimum insulation resistance not less than 1 mega
ohm.
For Site Built Assemblies, the insulation applied to the live parts of
the assemblies for basic protection shall be tested with an applied
voltage equivalent to that specified in the appropriate Regulation
and/or COP for similar factory-built equipment. The supplementary
insulation of Site Built Assemblies for fault protection shall be tested
for degree of protection not less than IP 2X, and the insulation
enclosure shall be tested with an applied voltage equivalent to that
specified in the appropriate Regulation and/or COP for similar factory built
equipment.
4.2.5 Polarity
The test shall be in accordance with COP Code 21B(6).
A test of polarity should be carried out to verify that:-
(a) every fuse and single-pole control and protective device is
connected in the phase conductor only;
(b) centre-contact bayonet and Edison-type screw lampholders to
IEC 60238 in circuits having an earthed neutral conductor,
have their outer or screwed contacts connected to that neutral
conductor; and
(c) wiring has been correctly connected to socket outlets and
similar accessories.
4.2.6 Earth Electrode Resistance
The test shall be in accordance with COP Code 21B(7).
A proper earth electrode resistance tester should be used to measure
earth electrode resistance. An alternating current at 50 Hz of a steady
value is passed between the earth electrode T and an auxiliary earth
electrode T1 placed at a separation distance recommended by the
manufacturer of the tester but in any case should not be less than 20
metres away. A second auxiliary earth electrode T2, which may be a
metal spike driven into the ground, is then inserted half-way between
T and T1, and the voltage drop between T and T2, divided by the
current flowing between T and T1, gives a measured earth electrode
resistance of earth electrode T.
For an electrical installation having four or more earth electrodes
which are installed more or less in line, following a general direction
not exceeding 15° deviation and with separation between adjacent
electrodes not less than the recommended distance by the
manufacturer of the tester but in any case not less than 20 metres,
these electrodes can be used in turn as the auxiliary electrodes for the
purpose of measuring the earth electrode resistances.
The following alternative method for measuring the earth electrode
resistance may be used if the electricity supply is connected. A loop
impedance tester should be connected between the phase conductor at
the origin of the installation and the earth electrode with the test link
open, and a test performed. This impedance reading could be treated
as the electrode resistance.
4.2.7 Earth Fault Loop Resistance
The test shall be in accordance with COP Code 21B(8).
The earth fault loop impedance should be measured by a phase-earth
loop tester with a scale calibrated in ohms.
The earth fault loop impedance should not exceed the requirements of
COP Code 11.
Before the test begins, it is essential to establish, by inspection, that
the earthing conductor and all relevant earth connections are in place,
and that the bonding connection to electricity supplier’s earthing
facilities is disconnected. Measures should be taken, during the
impedance tests especially when the earth leakage protective devices
are effectively removed for the duration of the tests, to ensure that the
installation is not being used other than by person(s) carrying out the
tests.
4.2.8 Functions of All Devices including Protective Devices
The test shall be in accordance with COP Code 21B(9).
Functional Test of Residual Current Device (RCD):-
(a) Function of residual current devices should be checked by a
residual current device tester simulating an earth fault in
order to verify its effective operation. The in-built test button
should also be tested for proper functioning. One of the
testing methods is specified in subparagraph (b) and (c)
below. Other testing methods complying with relevant
national and/or international standards are also acceptable.
(b) The test should be made on the load side of the RCD between
the phase conductor of the protected circuit and the associated
circuit protective conductor. The load should be
disconnected during the test.
(c) For general purpose RCDs to IEC 61008 or RCBOs to IEC
61009, with a leakage current flowing equivalent to 50% of
the rated tripping current of the RCD, the device should not
open. When a leakage current is flowing equivalent to 100%
of the rated tripping current of the RCD, the device should
open in less than 300 ms unless it is of ‘Type S’ (or selective)
which incorporates an intentional time delay, when it should
trip within the time range from 130 ms to 500 ms.
Function of other protective devices, such as miniature circuit
breakers, moulded case circuit breakers, air circuit breakers, fused
switches, switch-fuses and protective relays etc. should be checked by
hand operation as appropriate.
Function of all items of equipment such as isolators, switches and
indicative devices should be checked by hand operation.
Secondary Injection Test
(a) The overload and fault current protection characteristics of
protection relays should be verified with secondary injection
test.
(b) The test should be carried out by injecting a.c. of different
magnitudes into the relay terminals and measuring the relay
operating time. The operating time should be checked
against the manufacturer’s data sheet.
4.2.9 Additional Check for Installation in Hazardous Environment
The following additional check, where appropriate, shall be carried out
for installations in hazardous environment in accordance with COP
Code 21B(10):-
(a) Where appropriate, the area involved should be checked to
ensure ‘gas free’ condition before insulation and earth fault
loop impedance test are carried out.
(b) All equipment should be suitably protected according to the
types of protection under COP Code 15. The integrity of the
type of protection provided for the equipment should not be
jeopardised by the method of installation. No alteration that
may invalidate the conditions of protection can be used.
(c) Equipment should be kept clean and free from accumulation
of dust, foreign particles and deleterious substances.
Equipment is kept free from condensation.
(d) All lamps, fuses and replaceable parts should be checked so
that correct rating and types are being used.
(e) The surface temperature of all equipment should be
appropriate to the type of protection being provided.
4.3 Statutory Inspection and Test for High Voltage Installations
4.3.1 Inspection before Test
The inspection shall be in accordance with COP Code 21C.
Inspection of H.V. installations should follow those for L.V.
installations listed in section 4.2 of this T&C Procedure with
additional checks on the following items where relevant:-
(a) provision of suitable locking facilities for every entry to an
H.V. switchroom/substation;
(b) continuity of protective conductors especially the bonding of
all exposed conductive parts; and
(c) provision of padlock facilities for shutters, key boxes etc.
4.3.2 Safety
Precautionary measures should be taken and the methods of tests
should be such that no danger to persons or property can occur even if
the circuit being tested is defective.
Before carrying out the T&C for high voltage installations, the EE
Contractor shall submit risk assessment, safety plan and
implementation procedure to PBSE for approval.
4.3.3 Testing Requirements
Testing for High Voltage installations should be referred to relevant
recognized standards, manufacturers’ recommendation, operations and
maintenance instructions.
The EE Contractor shall responsible to submit a full T&C plan with
inspection and test details to PBSE for approval.
4.4 Functional Test of System /Equipment
4.4.1 Lightning Protection System
The whole lightning protection system shall be tested for continuity
between air terminations and earthing terminations and the resistance
shall be recorded.
The earth termination resistance shall be tested and recorded. Each
earth termination shall have a resistance to earth not exceeding the
product given by 10 ohms times the number of earth terminations to
be provided. The whole of the lightning protection system shall have
a combined resistance to earth not exceeding 10 ohms.
Where the steel work of the structure is used as down conductor, the
continuity of the steel work shall be tested and recorded.
Locations of all earth electrodes and down tape routing shall be
checked to be clear of any dangerous goods store, diesel tanks and
inflammable stores, etc.
All connections at terminations, tee off points and earth electrodes
shall be checked for tightness.
4.4.2 Circuitry Check
All circuits shall be verified through switching operation to ensure that
the circuits are installed in accordance with the designated circuit. The
tests shall include but not be limited to the following:-
(a) on/off switching of the lighting circuit to ensure that the
lighting circuit is installed corresponding to the lighting
switch, protective device and labelling;
(b) switching of the general power circuit to ensure that the
circuit corresponds to the protective device such as RCD,
RCBO and MCB, and that the protective device performs in
accordance with the designated duty;
(c) switching of the main switch/isolator to ensure the
corresponding circuit is properly controlled by the main
switch/isolator;
(d) switching of all sub-main and main distribution circuits, e.g.
busducts, cable feeders, underground cables, etc. to ensure the
correct isolation of the connected circuit;
(e) switching of all changeover switches to ensure the changing
over sequence corresponds to the design criteria; and
(f) ensuring all the protective devices perform properly against
the designated circuit.
4.4.3 Charger and Battery Set
The following inspections and tests shall be carried out after
completion of the installation of the respective system and the
connection of the permanent supply cable:-
(a) inspection of the charger for correct connection to the mains
supply through a suitable rated fuse;
(b) inspection of the batteries proper connections;
(c) inspection of instruments, indicating lamps, fuses, relays and
labels on battery charger;
(d) for initial set-up, the batteries shall be charged at the manual
highest rate until the charging current remains constant. The
starting and finishing time are recorded. The capacity of
charger is checked for capability of recharging the batteries
from fully discharged to fully charged within the specified
duration;
(e) the charger output on load with batteries disconnected shall
be measured. This should be between 110% and 115% of the
normal batteries voltage and within the operating voltage
limits of all connected devices;
(f) the charger current on load with battery disconnected shall be
measured. This should be less than the maximum
recommended continuous charge current for the batteries;
(g) on interruption of mains input to the charger, the proper
operation of connected devices on standby batteries shall be
checked. In the case of switch tripping in Switchboard, mains
input shall be interrupted to check whether the capacity of the
batteries is adequate to trip the associated air circuit breaker
consecutively at least 20 times or up to twenty air circuit
breakers simultaneously, whichever the greater; and
(h) the correct function of charger fail/mains fail/battery
disconnected/boost charge/trickle charge indications as
specified shall be checked.
4.4.4 Lighting Installation
Lighting installation shall be tested in terms of its light quality and
control as following:-
(a) Before carrying out the lighting measurement and test, all
Page 15 of 24
EE_TCP
2012 Edition
luminaries shall be checked against the specified colour
temperature, beaming angle of spot lamp and aiming angle
for exterior floodlights.
(b) The aiming angle of external lighting or planter lighting shall
be commissioned so as not to create glare or any obstructive
light to external environment and neighbourhood building
users.
(c) Before commissioning and/or setting of lighting control
devices which including but not limited to timer switch,
occupancy sensor, photocell and infra-red sensor, the EE
Contractor shall submit commissioning/setting proposal to
PBSE for approval.
(d) Illumination level of lighting installation for individual
areas/rooms shall be measured to verify the light output. The
EE Contractor shall submit the proposed locations and height
levels for carrying out the measurement of illuminance level
to PBSE for approval before commencement of
measurement. Presentation of the measurement result shall
be in the form of marked up layout plan for the particular
area.
(e) Base on the measured illuminance results for individual
areas/rooms, the lighting uniformity of the respective
areas/rooms shall be evaluated in terms of minimum to
average illuminance ratio and/or any other uniformity ratio as
required by the PBSE.
(f) All grouping of luminaries shall be tested by hand operation
of the corresponding switches or timers.
(g) For lighting installation with interface connection to building
management system (BMS), or central control and
monitoring system (CCMS) or similar central computer
control system, the EE Contractor shall co-ordinate with other
contractors responsible for such computer control system, if
required, to demonstrate proper control function of the
lighting installation.
(h) For luminaries controlled by occupancy sensor, the ‘on’ and
‘off’ of luminaries shall be tested to demonstrate the function
of occupancy sensors.
(i) Luminaires controlled by daylight sensor shall be tested to
demonstrate the dimming function in maintaining lighting
level within the preset range of illumination.
4.4.5 Digital Multifunction Power Meter
The digital multifunction power meter shall be tested to verify the
measurement, recording and interfacing functions as required in the
General Specification.
Prior to the test for every digital multifunction power meter, the EE
Contractor shall provide manufacturer’s calibration certificate for each
meter for checking on the accuracy.
The EE Contractor shall provide testing kit to verify the reading
accuracy of the digital multifunction power meter.
For installation of digital multifunction power meter with connection
to building management system (BMS), or central control and
monitoring system (CCMS) or similar central computer monitoring
system, the EE Contractor shall co-ordinate with other contractor
responsible for such computer monitoring system, if required, to
demonstrate proper functioning and interfacing of the meter.
For installation of digital multifunction power meter without external
connection to BMS or CCMS, the interface functions including digital
and analogue output shall be tested by means of plugging in
communication module provided by the EE Contractor.
The replacement mechanism of the meter shall be tested. The test
shall demonstrate that the replacement of the meter does not require
the switching off of the respective switchgear. Current transformers
shorting block to prevent open circuiting the current transformers shall
also be tested.
4.4.6 Digital Power Analyzer
The testing requirement for digital power analyser shall be in
accordance to section 4.4.5.
In addition to test requirement as stipulated in section 4.4.5, the event
alarm function and waveform capture function of the digital power
analyser shall also be tested. The EE Contractor shall propose
simulated test method for PBSE’s approval.
4.4.7 Busbar Trunking System
In general, busbar trunking system shall be certified by testing
laboratories or organizations as stated in the COP. It shall be type
tested in accordance with Clause 8.1.1 of IEC 60439-2. The
Certificate on verification of short-circuit strength shall be carried out
by an Independent Short Circuit Testing Organization.
Short-circuit test on the phase and neutral busbars shall be carried out
in accordance with Clause 8.2.3 of IEC 60439-1 to the value of shortPage
17 of 24
EE_TCP
2012 Edition
circuit current specified in the General Specification.
The busbar insulation shall be tested in accordance with Clause 8.2.2
of IEC 60439-1. All test certificates shall be presented during
inspection and testing.
The busbar trunking system shall also be tested to verify its continuity,
insulation resistance, polarity, earth fault loop impedance and other
parameters as appropriate after installation.
For installation of busbar trunking with long run, phase transposition
of busbar in accordance with manufacturer’s recommendation shall be
checked.
Plug-in tap-off unit of busbar trunking system shall be tested to verify
proper and safe operation. Mechanical interlock, quick fastening and
quick releasing mechanism of the tap-off unit shall be tested. Positive
earth connection of tap-off unit shall be checked.
After power energization of the busbar trunking system, infrared
scanning at connecting joints shall be carried out to check for
abnormal rise in temperature at joints. The EE Contractor shall
submit proposal of the test methodology and propose testing points for
PBSE approval prior to the test.
4.4.8 Equipment and Appliances
Testing on electrical equipment and appliances supplied within the
electrical installation, e.g. meters, fans, etc. shall be carried out in
accordance with the relevant sections of other Building Services
Branch Testing and Commissioning Procedures for other building
services installations and manufacturer’s recommended testing
procedures.
4.4.9 Voltage Dip Ride-through Device
For equipment installed with voltage dip ride-through device, the EE
Contractor shall submit testing methodology and testing instrument to
PBSE for approval to demonstrate the device can comply with the
voltage dip requirements in the Specification.
4.4.10 Harmonic Correction Device
For circuits installed with harmonic correction device, the EE
Contractor shall submit test methodology and measuring instrument to
PBSE for approval to demonstrate the device can comply with the
requirements on elimination of harmonic currents in the Specification
to meet the Total Harmonic Distortion (THD) requirements in the
BEC.
The measuring points shall be selected as close as possible to the
harmonic generating equipment, e.g. the distribution board or isolator
feeding the harmonic generating equipment. For three phase harmonic
generating equipment, the THD current of each phase shall be
measured and recorded concurrently. Under some circumstances, the
THD of the circuits feeding the harmonic generating equipment should
be measured for a sufficient long period of time in order to provide an
accurate and representative of the maximum THD value. The period
of measurement shall be agreed with PBSE.
4.4.11 Any Other Tests that are Considered Necessary to Meet the Design
Intent
For any other system /equipment that are not covered by this T&C
Procedure, the EE Contractor shall submit full details of testing
requirements as recommended by the relevant manufacturer to PBSE
for approval.
4.5 Assessment of Any Characteristics of Equipment Likely to have Harmful
Effects
Before carrying out the T&C, the EE Contractor shall conduct assessment for
any characteristics of equipment likely to have harmful effects upon other
electrical equipment or other services, or impair the supply. Those
characteristics include the following:-
(a) Overvoltages;
(b) Undervoltages;
(c) Fluctuating loads;
(d) Unbalanced loads;
(e) Power factor;
(f) Starting currents;
(g) Harmonic currents;
(h) Direct current (d.c.) feedback;
(i) High frequency oscillations; and
(j) Necessity for additional connection to earth.
The EE Contractor shall, after conduct the assessment, submit an assessment
report to PBSE for consideration.
Page 19 of 24
EE_TCP
2012 Edition
4.6 Test and Inspection for Low Voltage Cubicle Switchboard (LVSB)
The following sections stipulate the additional inspection and testing
requirements for LVSB installation. For comprehensive testing and
commissioning, the EE Contractor shall also refer to relevant sections of this
T&C Procedure and carry out inspection /test accordingly.
4.6.1 Visual Inspection
Visual inspection shall be carried out for the proper installation of the
LVSB Installation in accordance with the Specification. The
following components shall be included:-
(a) construction of type tested assembly;
(b) main busbars and droppers/risers;
(c) air circuit breakers/fuse switches;
(d) power factor correction capacitor bank;
(e) harmonic filter;
(f) automatic changeover switch;
(g) instrumentation and protection devices;
(h) incoming/outgoing busbars and cables;
(i) portable earthing equipment;
(j) operating handles/keys;
(k) hydraulic truck; and
(l) rubber insulation mat.
4.6.2 Site Test before Connection of Incoming Supply
The following tests shall be carried out on the Site after completion of
installation of the LVSB and before the connection of the incoming
supply cable:-
(a) Dielectric Test
Dielectric test shall be carried out to verify the dielectric
properties of the LVSB. The test requirements shall be in
accordance with IEC 60439-1.
(b) Insulation Test
Page 20 of 24
EE_TCP
2012 Edition
This shall be carried out by means of a 1000V insulation
tester or similar instrument.
(c) Secondary Injection Test
This shall be carried out using a.c. and shall check
(approximately) that protection relays or devices function in
accordance with their performance curves by a test at the
lowest setting and two further tests of current and timing.
(d) Primary Injection Test
This shall be carried out to prove the correct operation of
protective devices or system when set at the agreed setting.
(e) Polarity Check for Current Transformer (C.T.)
This shall be carried out to ensure that all C.T. are correctly
connected.
(f) Functional Test of All Devices
This shall be carried out to ensure that all devices can operate
properly as intended.
The equipment to be tested shall include, but not limited to,
all circuit breakers, isolating switches, changeover switches,
contactors, interlocking facilities, protective relays, earth
leakage tripping devices, metering facilities and instruments.
(g) Contact Resistance Test
This shall be carried out by means of "Ductor" tester or
similar instrument to ensure that contacts and joints for
switchgears, cables, busbars as well as the contacts and joints
for outgoing cables and busbars are maintained in good
condition.
(h) Temperature Rise Limits Test
This shall be carried out as defined in IEC 60439-1.
With the prior approval by the PBSE, the primary injection test and
temperature rise limits test can be carried out in factory due to site
constraints.
4.6.3 Site Test After Connection of Incoming Supply
The following tests shall be carried out after the incoming supply
cables are connected and the LVSB successfully commissioned on no
Page 21 of 24
EE_TCP
2012 Edition
load:-
(a) phase-to-phase voltage test;
(b) phase-to-neutral voltage test;
(c) phase-to-earth voltage test;
(d) neutral-to-earth voltage test; and
(e) phase sequence test on each and every outgoing circuit.
4.7 Power Energization
4.7.1 Notification of Completion
After the proper testing and commissioning of the electrical
installation, the EE Contractor shall notify the appropriate Authority,
through the PBSE, on the completion of the installation and its
readiness for inspection and testing.
4.7.2 Preliminary Steps for Power Energization
The followings shall be checked before power energization:-
(a) busbar chambers, main and sub-main switch connections, i.e.
bolts and nuts tightness;
(b) earthing connections at compartments, all switches and earth
electrodes;
(c) clearance of live parts from direct contact with or any
likelihood of contact with tools, spurious bare conductors
remaining in switches, air circuit breakers (ACB) and switch
cubicles;
(d) polarity, phase sequence of all switches and relevant fuse
ratings;
(e) stand-by battery supply and the operation of shunt trip
mechanism;
(f) settings of overcurrent, earth fault relays and current
transformer (C.T.) polarity;
(g) vacuum cleaning of switches and ACBs;
(h) provision of danger and warning signs; and
(i) certified Work Completion Certificate in accordance to the
Page 22 of 24
EE_TCP
2012 Edition
requirement of COP Code 19.
4.7.3 Switch On Process
Whenever there is any break of time, e.g. the next day, in carrying out
the switch on process, re-test of insulation resistance is required. The
following procedures shall be followed in the switch on process:-
(a) switch on the main switch/ACB with all other sub-main
switches off;
(b) if normal, switch on other sub-main switches one by one with
all other outgoing switches off;
(c) if normal, then switch on all other out-going switches one by
one;
(d) observe the disc of the overcurrent and earth fault protection
relays for any movement for IDMT relays or for digital
protection relays check whether there are any fault
indications; and
(e) keep vigilance for about 30 minutes to see if any smell or
abnormal noise being generated.
4.8 Verification of Electrical Installation and Lighting Installation for
demonstration of Compliance with the Building Energy Code (BEC)
After notification of completion of the Installations, the EE Contractor shall
verify and record the electrical and lighting installation on the Site with PBSI
and then submit the records to PBSE for his/her consolidation to demonstrate
compliance of the electrical and lighting installation with the BEC. The
requirements are:-
4.8.1 Power Distribution Loss (clause 7.4 of BEC)
The cabling route and cable size of the following circuits shall be
verified with PBSI on the Site. Base on the verified cable route, the
EE Contractor shall submit the cable length and size to PBSE:-
(a) Main circuit connecting the distribution transformer and the
main incoming circuit breaker of the LVSB if the transformer
room and the main switch room is not adjacent to each other
(clause 7.4.2 of BEC) ;
(b) Feeder circuits (clause 7.4.3 of BEC);
(c) Submain circuits (clause 7.4.4 of BEC) ; and
(d) Final circuits with rating of circuit protective device over 32A
Page 23 of 24
EE_TCP
2012 Edition
(clause 7.4.5 of BEC).
4.8.2 Motor Installation (clause 7.5 of BEC)
The relevant BS Contractors responsible for installing the motors shall
submit the following information of every installed motor to PBSE if
such motor does not form an integral part of an equipment or
installation fulfilling electrical power or equipment efficiency
requirement under relevant clauses of the BEC:-
(a) Application & designation number (e.g. motor for chilled
water pump);
(b) Motor rated output (in kW);
(c) Manufacturer and model number;
(d) 2-pole or 4-pole; and
(e) Full-load motor efficiency (%)
4.8.3 Power Quality (clause 7.6 of BEC)
Total Power Factor (clause 7.6.1 of BEC)
(a) If power factor correction device is not provided to circuit
connecting to the meter of the electricity supplier or circuit at
400A or above, single or three phase, (based on circuit
protective device rating and not applicable to circuit of lift &
escalator installation), the EE Contractor shall verify a spare
way of appropriate rating has been reserved at the local
distribution board or source motor control centre for the
future installation of power factor correction device (clause
7.6.1.3 of BEC).
Total Harmonic Distortion (clause 7.6.2 of BEC)
(a) If harmonic correction device is not provided to circuit
connecting to the meter of the electricity supplier or circuit at
400A or above, single or three phase, (based on circuit
protective device rating and not applicable to circuit of lift &
escalator installation), the EE Contractor shall verify a spare
way of appropriate rating has been reserved at the local
distribution board or source motor control centre for the
future installation of harmonic correction device. (clause
7.6.2.3 of BEC)
(b) The EE Contractor shall measure the harmonic current to
demonstrate maximum 5th harmonic current distortion is less
than 35% at the VSD input terminals during normal operation
within the variable speed range if group compensation at the
Page 24 of 24
EE_TCP
2012 Edition
motor control centre or local distribution board is provided.
(clause 7.6.2.4 of BEC)
4.8.4 Metering and Monitoring Facilities (clause 7.7 of BEC)
The installed metering and monitoring facilities shall be verified to
demonstrate the compliance with the minimum requirements in BEC:-
(a) Main circuit, feeder and submain circuit exceeding at or
above 400A – metering device is installed to measure
‘voltage’, ‘current’, ‘total power factor’, ‘total energy
consumption’, ‘maximum demand’ and ‘total harmonic
distortion’ (clause 7.7.1 & 7.7.3 of BEC); and
(b) Feeder and submain circuit exceeding 200A and below
400A – metering device is installed to measure ‘current’ and
‘total energy consumption’ (clause 7.7.2 of BEC)
4.8.5 Lighting Power Density (clause 5.4 of BEC)
The EE Contractor shall submit the following information for
verification of the installed lighting power density (LPD):- (clause
5.4.1 of BEC)
(a) Data of installed luminaries – circuit wattage of each type of
luminaire;
(b) Number and type of luminaires installed in each space; and
(c) Floor area of each space where luminaires were installed.
4.9 Calibrated Equipment
4.9.1 The EE Contractor shall supply the calibrated equipment relevant for
T&C of the Installations as stipulated in the Particular Specification of
the contract or the General Specification whichever appropriate. The
equipment shall be calibrated by the recognized laboratories accredited
with the Hong Kong Laboratory Accreditation Scheme (HOKLAS) or
other worldwide-recognised laboratories during the active period of
the contract.
4.9.2 A list of equipment proposed by the EE Contractor to be used for
T&C must be agreed with the PBSE prior to T&C. All equipment
requiring periodic calibration shall have this carried out before the
work commences. Data sheets of such testing instrument showing
manufacturer’s name, model number, latest date of calibration and
correction factors shall be submitted to the PBSE for record. If any
item requires re-checking the accuracy because of the time that has
elapsed since the previous calibration, this shall be carried out prior to
commencing the work.
