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General Specification for Electrical Installation

in Government Buildings

of the Hong Kong Special Administrative Region

2012 Edition

The 2012 edition of the General Specification for Electrical Installation in GovernmentBuildings of the Hong Kong Special Administrative Region comprises updates and revisionsto the 2007 edition.

The date and details for full implementation of the new General Specification forElectrical Installation in Government Buildings of the Hong Kong Special

Administrative Region 2012 edition will be announced in due course. Before the

aforementioned date, the General Specification for Electrical Installation in

Government Buildings of the Hong Kong Special Administrative Region 2007 edition

(Incorporating Corrigendum No. GSEE01) will still be the Contractual Document for

the captioned installation. The new 2012 edition may be viewed on the ArchSD

Homepage in preparation for its full implementation.

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Page 1 of 20 EEGS_changes

MAJOR CHANGES IN THE GENERAL SPECIFICATION FOR

ELECTRICAL INSTALLATION IN GOVERNMENT BUILDINGS OF

THE HONG KONG SPECIAL ADMINISTRATIVE REGION2012 EDITION

Old Ref. No. New Ref. No. Major Changes / Revisions / Amendments

The changes in the Corrigendum No. GSEE01 for the General Specification for Electrical Installation in Government Building of the Hong

Kong Special Administrative Region 2007 Edition are incorporated into the 2012 Edition.

Table of

Contents,

Clauses in

Sections A,E

To replace Worksby Installations.

Clauses in

Section A, B, C,

D and E

To replace Contractorby Electrical Contractor.

Clauses in

Section A

To replace Chapterby Cap..

Clauses in

Section A, C and

E

To replace Contract Documentsby Contract.

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Clauses in

Section A

To replace Contract Drawings by Drawings.

Clauses in

Section A and E

To replace the end of maintenance periodby the expiry date of Maintenance Period.

Clauses in

Section A

To replace site by Sitewhere appropriate.

Clauses in

Section A

To delete the government of the HKSAR.

TABLE OF CONTENTS

PART ASCOPE AND GENERAL REQUIREMENTS

A1.2 A1.2 To revise the heading Scope of the Works to Scope of the Installations

A3 A3 To revise the heading EXECUTION OF WORKS to EXECUTION OF INSTALLATIONS

A3.2 A3.2 To revise the heading Programme of Works to Programme of Installations

A3.4 A3.4 To revise the heading Coordination of Contract Works to Coordination of Installations

PART BINSTALLATION METHODOLOGY

B3.9 B3.9 To revise the heading Installation of Cable Trays to Installation of Perforated Cable Trays.

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B3.10 B3.10 To revise the heading Installation of Cable Ladders to Installation of Wire Mesh Cable Trays.

B3.10.1 B3.10.1 To revise the heading Dropout Plate for Cable Exit to General.

B3.10.2 B3.10.2 To revise the heading Flexible (Expansion) Couplers across Building Expansion Joint to Supports.

B3.10.3 B3.10.3 To revise the heading Ladder Covers to Bends.

B3.10.4 B3.10.4 To revise the heading End Connectors to Earthing.

B3.10.5 B3.10.5 To revise the heading Earthing to Safety Working Load.

B3.10 B3.11 To realign the clause number for heading Installation of Cable Ladder.

B3.10.1 B3.11.1 To realign the sub-clause number for heading Dropout Plate for Cable Exit.

B3.10.2 B3.11.2 To realign the sub-clause number for heading Flexible (Expansion) Couplers across Building

Expansion Joint.

B3.10.3 B3.11.3 To realign the sub-clause number for heading Ladder Covers.

B3.10.4 B3.11.4 To realign the sub-clause number for heading End Connectors.

B3.10.5 B3.11.5 To realign the sub-clause number for heading Earthing.

B3.10.6 B3.11.6 To realign the sub-clause number for heading Minimum Inside Radius of All Bends.

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B3.10.7 B3.11.7 To realign the sub-clause number for heading Supports.

B3.10.9 B3.11.8 To realign the sub-clause number for heading Safety Working Load.

B3.10.8 This sub-clause number is deleted

B9 B9 To correct the wording Voltage.

SECTION C3POWER CABLES AND ASSOCIATED CABLING FACILITIES

C3.10 C3.10 To revise the heading Metal Cable Tray to Perforated Metal Cable Tray.

C3.11 C3.11 To revise the heading Cable Ladder to Wire Mesh Cable Tray (Cable Basket).

C3.11.1 C3.11.1 To revise the heading Material to General.

C3.11.2 C3.11.2 To revise the heading Fittings and Accessories to Material.

C3.11.3 C3.11.3 To revise the heading Construction of Cable Ladder to Fittings and Accessories.

C3.11.4 New sub-clause Construction of Wire Mesh Cable Tray.

C3.11 C3.12 To realign the clause number for heading Cable Ladder.

C3.11.1 C3.12.1 To realign the sub-clause number for heading Material.

C3.11.2 C3.12.2 To realign the sub-clause number for heading Fittings and Accessories.

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C3.11.3 C3.12.3 To realign the sub-clause number for heading Construction of Cable Ladder.

Section C14 To add new section Computerized Lighting Management System

C14.1 To add new clause General

C14.2 To add new clause System Requirement

C14.3 To add new clause Communication Bus

C14.4 To add new clause Lighting Control Modules

PART ASCOPE AND GENERAL REQUIREMENTS

SECTION A1SCOPE OF SPECIFICATION

A1.1 A1.1 To replace The electrical installation, in so far as it is not overridden by the General Conditions of

Contract, Special Conditions of Contract, Particular Specification for the Works, Drawings and/ or

written instructions of the Architect. by The Electrical Installation,in so faras it is not overridden by

the Conditions, Particular Specification, Drawings and/ or written instructions of the Architect.

A1.2 A1.2 To change the heading SCOPE OF THE WORKSto SCOPE OF THE INSTALLATIONS.

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A1.2 A1.2 To replace This General Specification, Particular Specification, Tender Equipment Schedule and

Drawings detail the performance requirements of the Works. The Works to be carried out in accordance

with this General Specification shall include the installation and supply of all materials necessary to

form a complete Installations including any necessary tests, adjustments, commissioning and

maintenance as prescribed and all other incidental sundry components together with the necessarylabour for installing such components, for the proper operation of the installations.by This General

Specification, Particular Specification, Tender Equipment Schedule and Drawings detail the

performance requirements of the Installations. The Installations to be carried out in accordance with

this General Specification shall include the design where specified, installation and supply of all

materials necessary to form a complete Installations including any necessary tests, adjustments,

commissioning and maintenance as prescribed and all other incidental sundry components together

with the necessary labour for installing such components, for the proper operation of the Installations.

A1.3 A1.3 To replace In this General Specification, the following . by In this General Specification, all words

and expressions shall have the meaning as assigned to them under the Conditions unless otherwise

provided herein. The following

A1.3.1 A1.3.1 To revise the definition of Architect.

To revise the definition of Building Contractor.

To delete Contract and to add the definition of Conditions.

To delete Contractor.

To add the definition of Electrical Contractor.

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To add the definition of Installations.

To add the definition of Particular Specification.

To add the definition of Proprietary brand name materials or products.

To revise the definition of Tender.

SECTION A2STATUTORY OBLIGATIONS AND OTHER REGULATIONS

A2.1 A2.1 To revise the 1stparagraph to The Installations shall conform in all respects with the following:

A2.1.1 A2.1.1 To revise the 1stparagraph to All Enactments and Regulations, in particular, the Electrical Contractors

attention is drawn to the followings:

A2.1.1(d) To add the Building Energy Efficiency Ordinance (Cap. 610), and other subsidiary legislation made

under the Ordinance.

A2.1.2(a), (i) A2.1.2(a), (h) To revise the wording issue to published and Electrical and Mechanical Services Department, the

Government of the HKSARby EMSD.

A2.1.2(f), (g) A2.1.2(f) To change the Code of Practice for Energy Efficiency of Electrical Installations and Code of Practice

for Energy Efficiency of Lighting Installations to Code of Practice for Energy Efficiency of BuildingServices Installations in Building.

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A2.1.2(h) A2.1.2(g) To replace Design Manual: Barrier Free Access, issued by Buildings Department by Design Manual:

Barrier Free Access, 2008 published by the Buildings Department; and.

A2.1.2(i) A2.1.2(h) To realign sub-clause number.

A2.1.3(d) A2.1.3(d) To replace Construction Site (Safety) Regulationsby Construction Sites (Safety) Regulations,

Factories and Industrial Undertakings Ordinance (Cap. 59).

A2.1.3(g) A2.1.3(g) To add and at the end of the sub-clause.

A2.1.3(h) A2.1.3(h) To replace IEC 60364-7-704Ed. 2.0:2005: by IEC 60364-7-704:2005:

A2.1.4 A2.1.4 To replace BS, BS EN, ISO Standards, IEC Standards and Codes of Practice, etc. shall be deemed to

include all amendments, revisions and standards superseding the standards listed herein, which are

current at the closing date of the tender of the Contract unless otherwise specified. by BS, BS EN, ISO

Standards, IEC Standards and Codes of Practice, etc. shall be deemed to include all amendments,

revisions and standards superseding the standards listed herein, which are published before the date of

first tender invitation for the Contract or the Nominated Sub-contract (as appropriate)unless otherwise

specified..

A2.2 A2.2 To replace The documents forming the Contract are to be taken as mutually explanatory of one another

but in case of ambiguities or discrepancies the same shall be explained by the Architect who shall issue

to the Contractor instructions clarifying such ambiguities or discrepancies. by The documentsforming the Contract are to be taken as mutually explanatory of one another but in case of ambiguities

or discrepancies the same shall be dealt with in accordance with the Conditions.

SECTION A3EXECUTION OF WORKS

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A3 A3 To change the heading EXECUTION OF WORKS to EXECUTION OF INSTALLATIONS.

A3.2 A3.2 To change the sub- heading PROGRAMME OF WORKS to PROGRAMME OF

INSTALLATIONS.

A3.2 A3.2 To replace as required by the Architect by as directed by the Architect in the last paragraph.

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A3.3 A3.3 To replace the 3rdparagraph All expenses properly incurred and losses suffered by the Employer as a

result of the Contractors failure to comply with the above requirements are recoverable by the

Employer from the Contractor. by All expenses properly incurred and losses suffered by the

Employer as a result of the Electrical Contractors failure to comply with the above requirements are

recoverable by the Employer from the Electrical Contractor as a debt under the Conditions or via theBuilding Contractor as if it is a debt liable to the Building Contractor under the Sub-contract as

appropriate..

To replace the 4thparagraph The Contractor shall ensure that such works are essential for the execution

of the Works. In the event that any of such works is proved to be non-essential, unnecessary and/or

abortive, the Contractor shall bear the full cost of such works including but not limited to any

unnecessary or incorrect cutting-away and making-good and shall reimburse the Employer for all cost

incurred in this connection. by The Electrical Contractor shall ensure that such works are essential for

the execution of the Installations. In the event that any of such works is proved to be non-essential,

unnecessary and/or abortive, the Electrical Contractor shall bear the full cost of such works including

but not limited to any unnecessary or incorrect cutting-away and making-good and all cost incurred in

this connection are recoverable by the Employer from the Electrical Contractor as a debt under the

Conditions or via the Building Contractor as if it is a debt liable to the Building Contractor under the

Sub-contract as appropriate.

To replace the last sentence of the 5thparagraph All additional expenditure properly incurred and all

loss suffered in this connection by the Employer in having such works re-executed and rectified shall be

recoverable by the Employer from the Contractor. by All additional expenditure properly incurred and

all loss suffered in this connection by the Employer in having such works re-executed and rectified shallbe recoverable by the Employer from the Electrical Contractor as a debt under the Conditions or via the

Building Contractor as if it is a debt liable to the Building Contractor under the Sub-contract as

appropriate.

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A3.4 A3.4 To change the heading COORDINATION OF CONTRACT WORKS to COORDINATION OF

INSTALLATIONS.

A3.4 A3.4 To replace and sub-contractors.by and sub-contractors of the Building Contractor.

A3.5 A3.5 To replace and sub-contractors by and sub-contractors of the Building Contractor and on

Site by on the Sitein the first paragraph.

A3.6 A3.6 To replace supervisor by site supervisor.

A3.7 A3.7 To combine the 1stand 2ndparagraph.

To delete .in a reasonable time

To replace an extension of time by a longer period for the submission.

A3.9 A3.9 To replace the representative of the Architect... by the Architects Representative

A3.9 A3.9 To replace Materials and equipment delivered to Site and paid for in interim payment shall be

Employers property. Such materials and equipment shall not be removed from Site without the

approval of the Architect in writing and appropriate deduction shall be made in the next interim

payment in accordance with the Contract. by Materials and equipment delivered to Site are

Employers property. Such materials and equipment shall not be removed from Site without the prior

approval of the Architect in writing.

A3.10 A3.10 To delete until finally inspected, tested and accepted from the 1stparagraph.

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A3.10 A3.10 To replace Architects representatives by Architects Representatives in the 2nd

paragraph.

SECTION A4DRAWINGS AND MANUALS

A4.2.1 A4.2.1 To replace unless otherwise specified in the Contract by unless otherwise specified in the

Contract or the Sub-contract as appropriate in the 3rdparagraph.

A4.3.1 A4.3.1 To replace The Contractor shall submit 3 sets of the first draft prints of as-built drawings within 28

days of the issuance of the certificate of completion to the Architect for checking. by The Electrical

Contractor shall submit 3 sets of the first draft prints of as-built drawings within 28 days of the issuance

of the certificate of completion in accordance with the Contract to the Architect for checking. in the 1st

paragraph.

A4.3.1 A4.3.1 To replace The detailed requirements and the media of as-built drawings set out in the Preliminaries of

the Bills of Quantities or Specification Preliminaries. by The detailed requirements andthe media of

as-built drawings set out in the Contract shall be followed as appropriate. in the 3rdparagraph.

A4.4.3 A4.4.3 To replace issuance of the certificate of completion. by issuance of the certificate of completion

in accordance with the Contract. in the 1stparagraph.

A4.4.3 A4.4.3 To replace the 2ndparagraph The Contractor shall submit 2 sets of the first draft of the User Manual to

the Architect for comment at least 56 calendar days before the date of completion. by The Electrical

Contractor shall submit 2 sets of the first draft of the User Manual to the Architect for comment at least

56 days before the prescribed or extended date for completion of the Works. .

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A4.4.4(f),(h)(i),

(h)(ii),(j),

A4.4.5(d), (e)

A4.4.4(f),(h)(i),

(h)(ii),(j),

A4.4.5(d), (e)

The words change to Capital letter .

A4.4.6 A4.4.6 To replace O&M by Operation and Maintenance.

PART BINSTALLATION METHODOLOGY

SECTION B1GENERAL

B1.1.1 B1.1.1 To replace registered electrical workers to Registered Electrical Workers.

B1.1.1 B1.1.1 To add In this connection, the Electrical Contractors attention is drawn to the Special Conditions of

Contract under the Contract for the requirements relating to Qualified Tradesmen and Intermediate

Tradesmen.in the second paragraph.

B1.1.3 B1.1.3 To replace Works shall be carried out in such a manner as to comply with all the ordinances,

regulations, etc. as listed in Clause A2.1 together with any amendments made thereto. by Works shall

be carried out in such a manner as to conform in all respects comply with all the ordinances, regulations,

etc.

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B1.2.1 B1.2.1 To replace Inscription of label and engraving shall be in both Chinese and English characters. The

Details shall be submitted to the Architect for agreement. By The Electrical Contractor shall submit a

schedule of all labels, notices and identifications for the Architects approval prior to order and

installation. Inscription of label and engraving shall be in both Chinese and English characters. The

Chinese translations shall be referred to the Glossaries of Terms Commonly Used in GovernmentDepartments issued by the Civil Service Bureauof the Government of the HKSAR. Sample of label

and notice shall be submitted to the Architect for agreement.

B1.2.1 B1.2.1 To add the requirement for submission of label schedule and Chinese translations.

SECTION B3INSTALLATION OF POWER CABLES, CABLE TRAYS AND CABLE LADDERS

B3.9 B3.9 To revise the heading INSTALLATION OF CABLE TRAYS to INSTALLATION OF

PERFORATED CABLE TRAYS.

B3.10

B3.10.1-

B3.10.5

To add new clause and sub-clauses for the specification of Installation of wire mesh cable trays.

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B3.10

B3.10.1

B3.10.2

B3.10.3

B3.10.4

B3.10.5

B3.10.6

B3.10.7

B3.10.8

B3.10.9

B3.11

B3.11.1

B3.11.2

B3.11.3

B3.11.4

B3.11.5

B3.11.6

B3.11.7

B3.11.8

To realign clause and sub-clause number; and to delete sub-clause B3.10.8.

SECTION B4INSTALLATION OF GENERAL LIGHTING AND POWER

B4.4.6 B4.4.6 To replace contract by Contract.

SECTION B7INSTALLATION OF EARTHING SYSTEM

B7.3.5 B7.3.5 To replace building contractor to Building Contractor.

PART CMATERIAL AND EQUIPMENT SPECIFICATION

SECTION C1GENERAL

C1.1.4 C1.1.4 To revise the last paragraph by changing the Code of Practice for Energy Efficiency of LightingInstallations to Code of Practice for Energy Efficiency of Building Services Installations in Building..

SECTION C2WIRING SYSTEM : CABLES, CONDUITS, TRUNKING AND ACCESSORIES

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C2.2.3 C2.2.3 To revise the last paragraph by deleting the wording coupler.

SECTION C3POWER CABLES AND ASSOCIATED CABLING FACILITIES

C3.10 C3.10 To replace the heading Metal cable trays by Perforated metal cable trays.

C3.10.1 C3.10.1 General revision

C3.11

C3.11.1-

C3.11.4

To add new clauses and sub-clauses for the specification of WIRE MESH CABLE TRAY (CABLE

BASKET).

C3.11

C3.11.1

C3.11.2

C3.11.3

C3.12

C3.12.1

C3.12.2

C3.12.3

To realign clause and sub-clause number.

SECTION C5SWITCHGEAR AND ASSOCIATED EQUIPMENT

C5.14.1,

C5.14.2 and

C5.14.3

C5.14.1,

C5.14.2 and

C5.14.3

To change the edition of IEC 60947-4-1 to 2009.

C5.15 C5.15 To revise the heading AUTOMATIC CHANGEOVER SWITCH to CHANGEOVER SWITCH

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C5.15 C5.15 To revise the 1stparagraph from Changeover switch shall be electromagnetically controlled at mains

voltage, double air-break, four-pole type and tested to IEC 60947-4-1:2005 to Changeover switch

shall be either manually or automatically controlled at mains voltage, double air-break, four-pole type

and tested to IEC 60947-6-1:2005.

C5.15 C5.15 To replace AC-33 by AC-33A in the 2ndparagraph.

C5.15 C5.15 To replace Unless specified otherwise, by For automatic changeover switch in the 3rd

paragraph.

C5.15 C5.15 To add the 4thparagraph The control circuit of changeover switch shall incorporate a true power off

delay timer to overcome the momentarily mains alternating current power supply interruption.

C5.16.1(a) C5.16.1(a) To change the Code of Practice for Energy Efficiency of Electrical Installations to Code of Practicefor Energy Efficiency of Building Services Installations in Building.

C5.19.1(b) C5.19.1(b) To replace client by Employers representatives.

C5.19.2(a)(iv) C5.19.2(a)(iv) To change the odd harmonic current distortion to total harmonic current distortion of variable speed

drives.

C5.19.2(a)(v) C5.19.2(a)(v) To change the Code of Practice for Energy Efficiency of Air Conditioning Installations to Code of

Practice for Energy Efficiency of Building Services Installations in Building.

C5.19.3(b) C5.19.3(b) To revise the IP rating requirement of VSD unit.

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C5.20.1(d) C5.20.1(d) To add EMC standards for digital multifunction power meter.

C5.25.6 C5.25.6 To define the standard for minimum motor efficiency limits for motors and revise the nominal

efficiency limits for High Efficiency (IE2) motors to comply with IEC 60034-30:2008 and IEC

60034-2:2007; and to revise the values of nominal efficiency limits for IE2 motors.

C5.26.4 (a)(i),

C5.26.4(a)(vii),

C5.26.4(a)(viii) ,

C5.26.4(a)(ix)

C5.26.4 (a)(i),

C5.26.4(a)(vii),

C5.26.4(a)(viii),

C5.26.4(a)(ix)

To change the edition of IEC 60947-4-1 to 2009.

SECTION C11LOW VOLTAGE CUBICLE SWITCHBOARD

C11.8 C11.8 To revise the heading CIRCUIT BREAKERS, FUSESWITCHES AND AUTOMATIC

CHANGEOVER SWITCHESto CIRCUIT BREAKERS, FUSESWITCHES AND CHANGEOVER

SWITCHES.

C11.8 C11.8 To delete automatic .

C11.14 C11.14 To add IEC 61111:2009 standard for rubber mats.

SECTION C12DIESEL GENERATING SET INSTALLATION

C12.2.12 C12.2.12 To add IEC 61111:2009 and to delete other technically equivalent national or international standards.

C12.14 C12.14 To revise contract to Contract.

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SECTION C13HIGH VOLTAGE SWITCHGEAR AND EQUIPMENT

C13.3.4 C13.3.4 To add the new paragraph Each circuit breaker shall have remote control for opening and closing by

authorised personnel inside the main switch room to enhance operation safety. The open switch and

close switch of each circuit breaker shall be housed in a lockable box which is located near the door inthe main switch room. The switches shall be labelled to identify the circuit breakers under control.

C13.3.17 C13.3.17 To add IEC 61111:2009 standard.

C.13.6.4 C.13.6.4 To change the edition of BS EN 50262 to 1999.

SECTION C14COMPUTERIZED LIGHTING MANAGEMENT SYSTEM

C14.1

C14.2

C14.3

C14.4

To add new section and clauses for Computerized Lighting Management System

PART ETRAINING, INSPECTION, ATTENDANCE AND OPERATION & MAINTENANCE DURING

SECTION E1TRAINING TO USERS AND OPERATION AND MAINTENANCE AGENTS

E1.1 E1.1 To replace shall submit a "Training Schedule" at least two months prior to completion of installation

for the Architects Approval. by shall submit a "Training Schedule" at least two months prior tothe prescribed or extended date for the completion of the Works for the Architects Approval. in the

2ndparagraph.

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SECTION E3INSPECTION, OPERATION & MAINTENANCE REQUIREMENTS

E3 E3 To rephrase the 2nd paragraph to include the defective luminaire.

E3.3 E3.3 To replace Employers representative by Employer.