Mep Specifications

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ACES PROPERTY LIMITED

PROPOSED BUILDING (G+4+R)

ELECTRICAL SPECIFICATIONS

Prepared by

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SPECIFICATIONS ELEC/SPEC.16000.

SECTION

DESCRIPTION

16000 SCOPE AND EXTENT OF WORKS

16010 GENERAL REQUIREMENTS AND CONDITIONS

16110 CONTAINMENT SYSTEMS FOR WIRING AND CABLING CONDUITS, TRUNKING, TRAYS, LADDERS, DUCTS AND UNDER FLOOR TRUNKING 16123 LOW VOLATGE CABLES, WIRES AND ACCESSORIES

16124‐1 DU GUIDELINES

16124‐2 TELEPHONE AND CABLE TV SYSTEMS

16141 WIRING ACCESSORIES

16170 EARTHING SYSTEM

16411 LOW VOLTAGE AUTOMATIC POWER FACTOR CORRECTION PANEL 16426 LOW VOLTAGE ELECTRICAL SWITCHGEAR, MAIN, SUB‐MAIN AND FINAL

DISTRIBUTION BOARDS, ISOLATORS AND LOAD‐BREAK SWITCHES

16510 LIGHTING FIXTURES AND ACCESSORIES

16511 LIGHTING CONTROL SYSTEMS

16721‐16770 ANOLOGUE ADDRESSABLE VOICE INTEGRATED FIRE DETECTION AND ALARM SYSTEM

16780 CENTRALLY MONITORED SELF CONTAINED EMERGENCY LIGHTING SYSTEM

16781 MASTER DIGITAL SATELLITE AND TERRRESTRIAL ANTENNAE SYSTEM

16782 CLOSED CIRCUIT TELEVISION AND VIDEO SECURITY SURVEILLANCE SYSTEM

16782‐1 INTERCOM SYSTEM DIGITAL AUDIO INTERCOM

16783 SOLAR WATER HEATER SYSTEM

VENDOR LIST

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File: ELECSPEC16000.doc

Scope and Extent of Works

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ELECTRICAL INSTALLATION WORKS

SECTION 16000

SCOPE AND EXTENT OF WORKS

1. SCOPE OF WORKS

1.1 The enclosed Specifications cover the Electrical Installation works for the

project design is proposed to be “ B+G+4 Residential with Retail Building”

for Rajesh Building .

1.2. The Contractor shall be responsible for the supply, delivery to site, installation, commissioning and testing of the various electrical systems outlined briefly below and as described in detail in the relevant Specifications and drawings.

1.3. Prior to submitting his offer, the Contractor shall be required to visit the site for familiarization with all site conditions and scope of works.

1.4. The Contractor shall be responsible for preparing all workshop drawings for each electrical system and submit to the Engineer for his study, comments and subsequent approval.

1.5. The Contractor shall be responsible for obtaining approvals for all workshop drawings from respective statutory authorities prior to commencing execution of any works.

1.6. The Contractor shall obtain approval from the Engineer for all equipment and materials at an early date to enable placing of orders in good time. Contractor shall be responsible for applying, coordinating and obtaining/ issuing of all permits and necessary NOC’s from the local authorities (DM, DEWA, Etisalat, DU, RTA, Dubai Police, etc).

1.7. The Contractor shall be responsible for coordinating with Dubai Electricity and Water Authority (DEWA) for making all necessary arrangements for provision of H.T. electricity supply to the sub-station, and thence to respective Main L.V. Electrical room for connection to the Main distribution board, MDB. All costs, charges and fees required by the statutory authorities shall be included in his offer, except the power connection charges, which shall be paid by the Client.

1.8. Contractor shall be responsible to comply with Dubai Municipality and DEWA Green Building Regulations.

2. EXTENT OF WORKS

The Electrical Installation works shall include the supply, installation, testing, connecting and putting into satisfactory and safe service the following in compliance with details in relevant drawings, Specifications, Schedules of Luminaries, Schedule of equipment and accessories, and Load Schedules for various distribution boards:

2.1. Main L.V. ACB/MCCB Distribution Board, designated as MDB shall be form 4 Type 6, complete with kilo-watt-hour meter, ammeters, voltmeter/selector switches, cable glands, other necessary accessories etc. The MDB shall be complete with Power Factor Correcting Panel, designated as PFCP, housed in an independent enclosure, which shall not form an integral part of the MDB.

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Page 2 of 3 SPECIFICATIONS ELEC/SPEC.16000. 2.2. All Sub-main L.V. MCCB Distribution Boards designated SMDBs.

2.3. All Final TPN MCB Distribution Boards designated DBs.

2.4. All heavy-duty isolators constructed to protection grade IP65.

2.5. All L.V. cabling between MDBs and SMDBs, and between SMDBs and DBs,

isolators for fire fighting and other pumps, lifts, A/C Condensing Units and other similar equipment, all in compliance with details in drawings.

2.6. All L.V. cabling/wiring between MCB boards and respective outlet points

associated with internal and external lighting points, exhaust fans, general purpose socket-outlets, hand dryers, isolators etc., all in strict compliance with details in drawings and load schedules for respective boards.

2.7. All internal and external lighting points and respective fixtures.

2.8. All Emergency and Exit lighting points and respective fixtures.

2.9. All single gang, multigang and two-way lighting switches, other SP and DP

switches; timer activated contactor operated multi-gang switch assembly units with manual override facility for control of external lighting and roof

projection lighting circuits.

2.10. All Exhaust fans.

2.11. All recessed domestic type general purpose 13A single and twin switched socket outlets in offices and similar areas.

2.12. All single and twin surface mounted industrial type 13A switch socket outlets to IP65 in external areas.

2.13. Fused connection units for connection to water heaters, hand dryers and similar equipment.

2.14. Cord outlets for connection to exhaust fans.

2.15. For structured cabling voice and data system, only priority containment system comprising individual conduits to each voice and data outlet from respective Voice Data distributors, trays from main distributor to sub-main distributor, all in coordination with and to the requirements of the specialist sub-contractors who shall be responsible for supply and installation of all structured cabling equipment, voice and data socket outlets and cabling.

2.16. 3 No. UPS units, UPS1 feeding SPN board DB-CT1 in ground floor Computer and Telephone Room for lighting and small power circuits; UPS2 feeding SPN board DB-CT2 in first floor Computer and Telephone Room for lighting and small power circuits; UPS3 feeding SPN board DB-SEC in ground floor Security Room for supply to socket outlets for all E.L.V. systems inclusive of outlets for CCTV Cameras, Card Access System Magnetic Locks, Security Panel, Fire Alarm Control Panels etc.

2.17. High quality, high performance integrated Security System comprising CCTV and Card Access Control System complete with all necessary containment system, components and accessories deemed essential for a safe and reliable Security System.

2.18. Telephone system inclusive of PABX and complete with necessary external and internal conduits with draw tapes/wires, wiring, line jack outlets, main and sub-main distribution frames, junction boxes etc. all in strict compliance with the current rules, regulations, requirements and recommendations of

ETISALAT.

2.19. State-of-the-art Analogue Soft Addressable Voice Integrated Fire Detection and Alarm System, all in strict compliance with the current rules, regulations, requirements and recommendations of the local Civil Defence Autority.

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Page 3 of 3 SPECIFICATIONS ELEC/SPEC.16000. 2.20. High quality high performance Satellite Master Antennae System for

integration with the structured cabling system.

2.21. High quality high performance intelligent lighting control system for control of lighting circuits in respective public areas, Libraries, Multipurpose Halls etc.

2.22. Complete earthing system, inclusive of clean earthing for Telecommunication rooms.

2.23. Adequate and suitably sized uPVC conduits complete with draw wires for incoming ETISALAT cables.

2.24. Adequate numbers and suitably dimensioned manholes for telephone and electrical power cables.

2.25. Complete and satisfactory testing of all items of equipment and accessories for each system described above.

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General Requiremenst and Conditions

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ELECTRICAL INSTALLATION WORKS

SECTION 16010

GENERAL REQUIREMENTS AND CONDITIONS

1. GENERAL.

1.1 These Specifications cover the supply, delivery, storage, installation, connection, testing and commissioning of all equipment and materials required for the electrical installation works for the project, all in compliance with the General and Particular Specifications and Drawings

1.2. Prior to bidding, the Contractor shall be required to visit the site to ascertain limitations or constraints that may affect his works on site. In addition the Contractor shall study the Specifications and tender design drawings in detail as no variations shall be allowed due to lack of knowledge relating to site conditions and drawings implications.

1.3. The General and Particular Specifications shall be read in conjunction with

the Contracts Documents and Tender drawings. In the event of any discrepancies between the drawings and the Specifications, the drawings shall be deemed correct for tendering purposes. The Contractor shall, however, be required to draw attention to such discrepancies at the time of submitting his offer.

1.4. All electrical installation works shall be carried out in strict compliance with

details in drawings, load schedules for distribution boards, Schedules of equipment and materials, technical Specifications of equipment and materials, and any other instructions issued by the Engineer.

1.5. All electrical installation works shall conform to the best principles of modern

practice and shall be carried out by fully competent tradesmen of appropriate grades to the full satisfaction of the Engineer.

1.6. All equipment and materials shall be installed to guarantee satisfactory

operation at specified parameters.

1.7. To avoid delays and to facilitate smooth running of the works, the Contractor

shall ensure that after receipt of all necessary approvals from the Engineer, prompt orders for all items of equipment and materials shall be placed.

1.8. High quality brand new equipment and materials free from any flaws and

defects shall be used. Any equipment and material not accepted by the

Engineer shall be removed and replaced by the Contractor at his own expense.

1.9. The Contractor shall ensure all equipment, accessories and components are of

appropriate protection grade for installation in various areas, taking into account environmental considerations relating to dampness, sand, dust, corrosion etc.

1.10. The Contractor shall be responsible for the quality of all equipment, materials, accessories and fittings proposed for installation in the project. The Contractor shall submit Quality Inspection Plan for all items for Engineer’s study and review.

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Page 2 of 8 1.11. All equipment shall be manufactured by reputable manufacturers of

international repute with ISO 9001 accreditation. The manufacturers should

have been regularly engaged in the manufacture of respective items for at

least ten years, and their products have been used satisfactorily in similar projects.

1.12. The Contractor shall submit original documents of origin of country of all respective equipment and materials proposed for the project. In addition, Bill of Lading of all the said items of equipment shall also be submitted.

2. STANDARDS AND CODES

All electrical materials and equipment used in electrical installation works shall comply with the requirements of the latest edition of the relevant International Electro-Technical Commission (IEC) publications, British Standards (BS), and NFPA.

All electrical installation works shall be carried out in strict compliance with current rules, regulations, requirements and recommendations of the following institutes and statutory authorities:

a) Dubai Electricity and Water Authority (DEWA) Wiring Regulations.

b) Wiring Regulations of the Institution of Electrical Engineers (IEE), UK, now

published as BS7671:2001.

c) IEC Regulations for Electrical Installations in Buildings, publication IEC 364.

d) Local ETISALAT Office for all works related to Telephone and Structured

Cabling Systems.

e) Local Civil Defence Authority for all works related to Fire Detection and

Alarm System.

f) Dubai Municipality, DEWA and Green Building Regulation.

3. CLIMATIC CONDITIONS

All electrical equipment, materials, apparatus, accessories and fittings used in the installations shall be suitable for use in the climatic conditions prevalent in Ajman as detailed below :

a) Maximum ambient temperature : 55 degrees C (to be reviewed).

b) Relative humidity : 95%

4. ELECTRICITY SUPPLY AND SERVICE CONDITIONS

All electrical equipment, materials, apparatus, accessories and fittings used in the installations shall be designed and manufactured to operate safely and continuously in the electricity supply system provided by DEWA with the following characteristics:

Voltage : 380V +/- 5%, 3 phase, 4-wire

Frequency : 50 Hz +/- 2%

Neutral : solidly earthed, TNT system

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30 MVA, supplied from a 1500 kVA transformer

Fault duration : 1 second.

5. STATUTORY APPROVALS, FEES AND INSPECTION

5.1. The Contractor shall coordinate with DEWA to obtain all relevant information, data and instructions pertaining to his parts of the works.

5.2. The Contractor shall coordinate with DEWA to make all necessary arrangements for the supply and installation of all high-voltage equipment for connection of electricity supply for the project.

5.3. The contractor shall coordinate with ETISALAT to obtain all relevant

information, data and instructions pertaining to telephone, voice and data system installation works.

5.4. The Contractor shall coordinate with the local Civil Defense Authority to

obtain all relevant information, data and instructions pertaining to installation works for Fire Detection and Alarm system.

5.5. Prior to commencement of any installation works, the Contractor shall submit

specified number of copies of drawings to relevant authorities for checking, comments and approval. Any modifications or additional requirements by the relevant authority shall be brought forthwith to the attention of the Engineer for further action and compliance.

5.6. To avoid unnecessary delays, the Contractor shall arrange for inspection of

works by the relevant authorities on an on-going basis during the course of works.

5.7. On completion of works, final approval certificates from each statutory

authority shall be submitted to the Engineer for handing over to the Client.

5.8. The Contractor shall pay all attendance and other charges to the relevant

authorities.

6. CO-ORDINATION WITH OTHER TRADES AND SUPPLIERS.

6.1. The contractor shall coordinate with the plumbing works sub-contractor to

ascertain locations and routes of all water and drainage pipes to ensure sufficient and safe clearances are maintained between these and electrical services in all areas.

6.2. The ratings of isolators for water pumps, fire fighting pumps, booster pumps, A.C.

Condensing Units, Extract Fans, lifts, and other electrically operated equipment have been stipulated after coordination at the design stage with the Plumbing and Mechanical Engineers. However, the Contractor shall be required to coordinate with the concerned sub-contractors and manufacturers of proposed equipment and supply and install suitable isolators of correct ratings to match requirements of equipment finally selected for installation.

6.3. The Contractor shall coordinate with the suppliers and installers of all

specialist equipment inclusive of false ceilings; A.C. equipment and duct

work; Fire Detection and Alarm System; Closed Circuit TV vigilance system ;

Structured Cabling System for voice, data and TV Systems; P.A. system,

Access Control Security System, Telephone System installation etc. to

facilitate, wherever applicable, correct and satisfactory installation of

containment network comprising conduits, trunking, trays etc. for points associated with the respective systems.

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6.4. Layout of A.C. grills, fire alarm detectors, sound system speakers, emergency

lighting luminaires, indoor and outdoor CCTV cameras, Access Conrol Security System clearances above false ceilings etc. shall be fully coordinated with other trades for proper and satisfactory siting of lighting fixtures in the false ceilings.

6.5. Prior to commencement of any works, the Contractor shall liase with all other

sub-contractors for all services and submit co-ordinated drawings to the Engineer for his study, comments and final approval.

6.6. The Contractor shall include in his tender all necessary expenses, if any, or providing services to other specialist sub-contractors.

7. TENDER DRAWINGS AND POSITIONS OF FITTINGS.

7.1. Approximate locations of various items of electrical equipment inclusive of

wiring accessories, lighting luminaires, isolators, distribution boards, panels and components of Fire Detection and Alarm system, Structured Cabling System, Telephone System, CCTV System, P.A. System, Access Control

Security System etc. indicated in the drawings shall be assumed to be

correct for tendering purposes only, and are intended to indicate general

requirements and arrangement of aforementioned equipment and accessories. Locations of items of electrical equipment may be changed on site to comply with furniture layout and/or architectural requirements.

7.2. The electrical design drawings do not intend to show architectural, structural,

fabrication or installation details. For accurate dimensions refer to architectural and structural drawings. Elevations for all services shall be verified prior to commencement of any electrical installation works.

8. CONSTRUCTION DRAWINGS

8.1. Four sets of tender drawings for all electrical works shall be provided to the

Contractor. Any necessary design modifications shall be in the form of design notes and / or sketches as directed by the Engineer.

8.2. To facilitate satisfactory execution of electrical installation works and to avoid

any conflict with other trades and services, the Contractor shall be responsible for preparing all relevant coordinated construction drawings.

8.3. The Contractor shall submit, within thirty days of Engineer’s instructions for

commencement of works, three copies of drawings indicating dimensioned details of sleeves, openings, holes, chases etc. required in the structure; piping and equipment in shafts; piping and equipment in mechanical and plant rooms

and other critical areas; equipment foundations; trenches; anchors; inertia

slabs etc. to be provided by others to enable him to fulfil his part of the works.

8.4. Transparencies and four sets of printed copies of all coordinated construction

drawings approved and stamped by all other trades shall be submitted to the Engineer.

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9. WORKING AND “AS FITTED “ DRAWINGS AND OPERATING MAUALS

9.1. During the course of the works the contractor shall maintain a fully detailed

record of all changes to the Tender Drawings as true record of actual installations.

9.2. The drawings shall show the complete electrical installation works of all

electrical systems within and external to the building, inclusive of the type, cross- sectional areas and runs/lengths of all L.V. cables, the precise locations of all cables which may be buried within the structure, and those sections of any external cables which are buried directly in the ground.

9.3. The locations and depths of all underground cables and uPVC conduits for

incoming ETISALAT cables at the various entry points shall also be clearly indicated.

9.4. The Contractor shall be fully responsible for the accuracy of dimensions of all

equipment with respect to space available, for accessibility of equipment for maintenance and service, and for compliance with the rules, regulations, requirements and recommendations of the statutory authorities.

9.5. Preparation and submission of drawings is subject to Contractual obligations

and any delay shall be subject to penalties and other remedies as determined by the Engineer.

9.6. Within one month of completion of the installations, the Contractor shall

provide 3 No. complete sets of the following record drawings for all above mentioned systems, as detailed below, for Engineers study, comments and final approval :

i) General arrangement of all electrical services “ AS FITTED”, to scale not less than 1:100 metric.

ii) Details of all items of plant and equipment including name and address

of respective manufacturer, type and model, serial number, duty, rating and any other pertinent information.

iii) Single line schematic drawings to a scale not less than 1:100 metric,

indicating position of all distribution boards, isolators, switches, control panels etc. with relevant notes describing their functions.

9.7. After obtaining approval in writing for the drawings, the Contractor shall

provide one negative and two prints of each drawing together with two bound sets of all manuals and operating instructions to the Engineer for issuing these to the Client.

10. PERSONNEL TRAINING

10.1. Prior to acceptance of the works, the Contractor shall be required to train and

instruct Client’s personnel in the correct use, operation and supervision of

Fire Detection and Alarm System, Sound System, CCTV System and any other system installed in the building.

10.2. Prior to acceptance of the works, the Contractor shall also be required to demonstrate and explain to the client’s personnel the correct operation of all items of switchgear and the starting, running and stopping of all item of mechanical plant installed in the building.

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Page 6 of 8 SPECIFICATIONS ELEC/SPEC.16010. 10.3. The cost of the training programme shall be deemed to be included in the

Contract price.

10.4. The supplier shall be required to provide operating manuals to supplement the training courses.

11. ALTERNATIVE EQUIPMENT AND MATERIALS

11.1. As a guide to the quality of workmanship required, names of three

manufacturers together with technical details and, wherever applicable,

catalogue number shall generally be specified for each item in the Schedule of Luminaires, Equipment and Materials.

11.2. Client’s list of recommended and preferred manufacturers for lighting fixtures, wiring accessories, switchgear, cables, busbar ducts and other relevant equipment, materials and System shall be provided.

11.3. Any alternative offered shall be equivalent or better in quality than those specified, and shall be approved in writing by the Engineer prior to placing order or installing in the project.

12. INSPECTION, TESTING AND COMMISSIONING

12.1. The Contractor shall provide necessary assistance and facilities to the Engineer to inspect all materials and equipment at works on site during the progress of the works.

12.2. The Contractor shall provide, free of charge, all necessary labour, materials, testing equipment and measuring instruments which may be required to carry

out the various tests on the installations in compliance with the

recommendations of the relevant statutory authorities and as directed by the Engineer.

12.3 The Contractor shall give fourteen days notice before the installation is ready

for inspection and testing. Subject to the Engineer’s agreement, the Contractor may proceed with the tests and forward three certified copies of the results obtained to the Engineer. If the results are found satisfactory in every respect, the installation shall be accepted, but such acceptance shall be without any prejudice to any claims in respect of any defects which may develop during the guarantee period for maintenance.

12.4. To facilitate progress of works it may be necessary to test sections of works separately.

12.5. Tests shall be repeated, within reasonable time and without extra charges, on any sections of the installations which have failed the tests.

12.6. In case where sections of works are located above false ceilings, the Contractor shall notify the Engineer that the works are ready for inspection and testing. No enclosures shall be installed until inspection and testing have been completed.

12.7. The Contractor shall be responsible for the correctness of electrical connections to all equipment prior to switching on the supply for their operation.

12.8. After connection of electricity supply, the Contractor shall commission all sections of the installations to demonstrate to the Engineer the satisfactory and correct operation of all items of installations.

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Page 7 of 8 SPECIFICATIONS ELEC/SPEC.16010.

13. ELECTRICAL TESTS.

13.1. On completion of the installations and prior to its being made “alive” for service, the

Contractor shall carry out the recommended electrical tests, on all sections of the works in the presence of the Engineer and the representative of the Federal Electricity and Water Authority.

13.2. All tests shall be carried out in strict compliance with the requirements and

recommendations of the 16th Edition of the IEE Wiring Regulations

(BS7671:2001) and the current Wiring Regulations of DEWA.

13.2. Electrical Tests shall include the following :

i) Insulation resistance tests between conductors, and between conductors

and earth.

ii) Earth continuity tests.

iii) Earth resistance measurements. iv) Verification of polarity.

v) Ring circuit continuity tests.

vi) Operational tests on all Residual Current Circuit Breakers. vii) Operational tests on all equipment and relays.

14. MAINTENANCE AND SERVICING.

The Contractor shall provide maintenance, servicing and replacement of all defective

parts during the maintenance guarantee period from the date of handing over the

project.

15. SAMPLES.

The Contractor shall submit samples of all materials, fittings and fixtures to the Engineer and obtain his written approval prior to placing order or using or installing these in any part of the works.

16. SPARE PARTS.

In accordance with respective manufacturer’s recommendations, the contractor shall provide, as part of the Contract, all special tools required for equipment maintenance

together with list of spare parts deemed essential for two years, together with

individual prices of all items of spares.

17. NOTICES.

In each electrical room the following Notices relating to important instructions and information shall be provided and hung in all electrical rooms :

i) The instructions for the treatment of electric shock, in Arabic and English

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Page 8 of 8 SPECIFICATIONS ELEC/SPEC.16010. ii) A schematic diagram of the switchgear located in the room together with a

complete single line schematic drawing of the complete electrical distribution system, framed and mounted on the wall.

18. LABELS AND IDENTIFICATION MARKS.

All equipment and apparatus shall be permanently marked with the manufacturer’s name, and shall also be identified by engraved labels to indicate the services

controlled or to identify individual apparatus or equipment. Labels shall be securely fixed to the front cover of equipment in an approved manner.

19. NOTES FOR ELECTRICAL INSTALLATION WORKS.

19.1. Each Final MCB Distribution Board shall be sectionalized as indicated in respective load schedules in compliance with DEWA’s requirements.

19.2. Multigang lighting control switches incorporating more than one phase shall be equipped with phase barriers.

19.3. Lighting control switches shall be adequately rated to control respective inductive loads.

19.4. Each hand dryer or hair dryer shall be supplied via a connection unit and shall be controlled by a 20A DP switch with neon indicator.

19.5. Final locations of all wiring accessories shall be determined in coordination with Architect’s instructions and in compliance with final furniture and equipment layouts.

19.6. All wiring shall be carried out in strict compliance with details in load

schedules of respective final MCB distribution boards.

19.7. Voltage drops to the farthest point of electrical supply shall not exceed 2.5% of DEWA’s declared nominal voltage.

19.8. All isolators shall be designed for heavy-duty service and shall comply with

degree of protection IP55 for internal and IP65 for external installations. All

isolators supplying motoring circuits shall conform with the requirements of type AC23.

19.9. Where cables, bus-ducts, cable trays, trunking, ladders, conduits etc. pass through fire rated floors, walk or roof, the Contractor shall provide internal and external fire sealant. For non-fire rated locations, the silicon sealants shall be used.

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Containment Systems for Wiring and Cabling Conduits , Trunking, Trays, Ladders

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ELECTRICAL INSTALLATION WORKS

SECTION - 16110

CONTAINMENT SYSTEMS FOR WIRING AND CABLING

CONDUITS, TRUNKING, TRAYS, LADDERS, DUCTS AND UNDER

FLOOR TRUNKING

The Contractor shall supply and install a complete network of containment system comprising conduits, underfloor trunking, cable trunking, trays, ladders and duct works in various area of the premises for satisfactory, correct, orderly and segregated distribution of wiring and cabling for electrical power, voice, data and other ELV services.

1. GENERAL GUIDELINES

1.1. All conduits, trunking, trays etc. shall be arranged in a neat and inconspicuous

manner, and each system shall be completely assembled, inspected and tested prior to cables/wiring being drawn in them.

1.2. All works shall be carried out in strict compliance with the recommendations

of the manufacturer and with guidelines and recommendations in BS

7671:2001, which incorporates the I.E.E. Wiring Regulations.

1.3. Notional routes of cables and other related instructions shall be indicated in

the drawings. However, prior to commencement of any parts of the works, the Contractor shall be required to submit, for Engineer’s study and approval, two prints of comprehensive working drawings indicating proposed routes of conduits, trays, trunking, trays, ladders and ducts together with all relevant dimensional details.

1.4. All containment systems shall be supported and secured to the building fabric

in a manner to ensure these are fully protected and have no load or stresses other than the loads of wiring and cabling they are designed to carry.

1.5. All accessories, fittings and components shall be of same manufacture as for

respective items of containment system.

2. INSTRUCTIONS AND GUIDELINES FOR CONDUIT INSTALLATIONS

2.1. No conduits of diameter smaller than 20 mm shall be used.

2.2. All conduits, throughout the installations, shall be of sufficiently large

cross-sectional area and shall be arranged, with sufficient number of strategically located draw-in boxes, to allow easy drawing of any or all the cables. Care shall be exercised to ensure that the number of wires drawn in a conduit, relative to its diameter, does not exceed the number stipulated in the Wiring

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Regulations BS 7671:2001. Should these differ in any way with the regulations of the Dubai Electricity Supply Authority, the requirements of the latter shall be adhered to.

2.3. All conduits shall be run in a manner to facilitate self-draining to outlet

boxes. Each length of conduit shall be cleaned and dried with the help of a swab drawn through its length, and all boxes shall be cleaned to remove moisture prior to installing cables.

2.4. Conduit bends shall be made with the bore of the tube remaining full and free

throughout and all conduits shall be perfectly smooth inside and outside, and free from any burrs and sharp corners. Bends shall be made without heating the conduits and by using approved type of bending machine or bending block to give results consistent with the best grade of craftsmanship.

2.5. No more than two right angle bends shall be permitted between draw-in

boxes. No diagonal runs of conduits shall be allowed on the walls of

structure. Conduits concealed in the ceiling slab shall run parallel to walls

and beams, and those concealed in walls shall be run vertical and/or horizontal.

2.6. All conduits cast in concrete or laid in floor screeds shall be effectively

secured, positioned and protected against mechanical damage, ingress of concrete etc. Allowance shall be made for thermal expansion and contraction of straight runs of conduits.

2.7. Where conduits run parallel to one another, the distance between adjacent

conduits shall not be less than 15 mm. At junction of multi-run of conduits, rectangular adaptor boxes having internal dimensions not less than 150 x 100 x 50 mm, shall be used. Maximum of 3 Nos. 20 mm diameter and a maximum of 2 nos. 20 mm diameter conduits shall enter the longer and shorter sides of the boxes respectively. For more or larger sized conduits, larger boxes of appropriate sizes shall be used.

2.8. All conduits embedded in walls shall be fully recessed to permit a minimum

thickness of 15 mm plaster or other finish to be obtained. Ceiling boxes for lighting fixtures shall be brought flush with the ceiling plaster or finish. The mounting boxes for flush type switches, socket outlets etc. shall be recessed squaring into the wall structure until the front edge is level with the finished surface of the plaster or other finish.

2.9. Conduits shall be terminated in accessories, distribution boards etc. either by

being screwed into the tapped spouts or holes where such are provided, or by locking into clearance holes by means of couplers and smooth bore hexagonal male bushes. Connections between the conduits and box with clearance holes shall, in addition, be filled with a brass compression washer between the box and the coupling with no exposed thread.

2.10. Under no circumstances holes shall be drilled in any structural steel or prestressed concrete without the prior written approval of the Engineer.

2.11. Adaptable switch and socket-outlet boxes in 1-gang and 2-gang configuration shall be constructed of pre-coated galvanized steel complying with the requirements of BS 4662:1970. These shall be complete with adjustable lugs, brass earth terminals, oval knock-outs, rubber grommets etc.

2.12. Separate and dedicated conduits shall be installed for lighting, small power, telephone, structured cabling and other ELV systems.

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Page 3 of 8 2.13. The Contractor shall be required to submit calculations to justify the proposed dimensions of the containment system in compliance with the space factors recommended by IEE Wiring Regulations and by DEWA. In general, space factor for conduits shall be 0.45 and space factor for trunking and ladders shall be 0.4.

2.14. Conduits installed on surface of walls and ceilings shall be supported along their entire runs by saddlers that shall be spaced in compliance with the recommendations of the manufacturer.

2.15. Conduits passing through water-proof membranes shall be equipped with 50 mm thick collars of appropriate thickness welded all around at membrane level, with the membrane pressed over the collars. After installation of conduits, the sleeves shall be filled with approved water tight sealant.

3. PVC CONDUITS AND ACCESSORIES

3.1. All PVC conduits shall be high-impact, rigid and heavy gauge complying

with the requirements of BS EN 50086-1:1994. Fittings and accessories shall be of same manufacture as the conduits. Minimum thickness of walls corresponding to respective outside diameter of conduits shall be as follows :

OUTSIDE DIAMETER WALL THICKNESS

(mm) (mm)

20 1.8

25 1.9

32 2.5

38 2.5

3.2. All conduits shall be unthreaded, slip-fit and push-on type. Unless otherwise

specified only plain couplers shall be used. All joints shall be made with weather-proof adhesive as recommended by the manufacturer.

3.3. Terminations in metal equipment and accessories with a tapped entry shall

employ flanged couplings locked to the metal case with smooth bore brass/PVC bushes.

3.4. At all expansion joints in the structure, expansion couplers shall be installed.

3.5. Draw-in boxes and switch mounting boxes shall be made of PVC and shall be

equipped with earth terminals.

3.6. Wherever necessary, approved type of flexible conduits and adaptors maybe

used.

3.7. Spacing of conduits runs from other services shall be the following minimum

values:

i) Cold water : 50 mm

ii) Hot water : 250 mm

iii) Air ducts : 20 mm

4. GALVANIZED STEEL CONDUITS AND ACCESSORIES.

4.1. All metal conduits shall be heavy gauge welded screwed steel tubing

complying with the requirements of BS 4568:PART 1:1970, and shall be heavily galvanized both inside and outside throughout their entire lengths.

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All conduit fittings and accessories shall be finished to the same

classification of protection as for the conduits.

4.2. All conduits shall be fixed in approved manner by means of crampets,

saddles, spacer bar saddles, cast distance saddles, cadmium plated steel screws, bolts, nuts etc. all complying with the requirements of BS 4568: PART 2:1970.

4.3. All conduits shall be threaded so that the ends of the conduits butt close

together in conduit coupling. Lock nuts shall be thoroughly coated with red lead after installation.

4.4. All conduits shall be mechanically and electrically continuous and shall be

effectively bonded and earthed. Earth connections and bonding to conduits shall be by means of copper tape or copper earth wire and earthing clamps complying with BS 951:1999. Where the conduit makes contact with structural steel, an efficient and permanent bond shall be made between the conduit and metal work.

4.5. All conduit boxes shall be constructed of malleable iron or pressed steel and

shall have the same classification for protection as for the conduit. Where they do not serve as outlets, they shall be fitted with lids secured with brass screws. Earthing terminals shall be provided in all outlet boxes.

4.6. On completion of installations, the conduits shall be checked and all

imperfections shall be made good. Rust, minor damage and exposed threads in conduit runs installed on the surfaces shall be painted with two coats of Zinc Chromate paint and finished with approved air drying metallic paint. Conduits concealed in the building structure shall be painted with two coats of air drying red lead paint. The paints shall be applied immediately after the completion of conduit installation.

4.7. Wherever there is likely to be excessive condensation, boxes shall be filled

with suitable plastic compound approved by the Engineer.

4.8. At all expansion joints in the structure an approved type of flexible sliding

connection shall be provided in every run of conduit to take up any expansion or contraction of the conduits under service conditions. Bonding across the joint shall be maintained by separate circuit protective conductor.

4.9. All conduit runs shall have adequate clearances between them and all other

service lines.

4.10. To facilitate movement between cabling and isolators for equipment, flexible conduit tubing and adaptors complying with the requirements of BS 731-1:1952 shall generally be used for housing the cables. For such connections approved type of solid bronze adaptors with standard thread for flexible conduits shall be used.

5. PVC TRUNKING INSTALLATIONS

5.1. Rigid heavy gauge PVC trunking of approved manufacture may be used in

lieu of multiple conduit runs. The trunking shall be rigidly supported along their entire lengths at intervals not exceeding 1.25 m. All fixings shall be carried out with cadmium plated steel screws.

5.2. All PVC trunking, lids, fittings and accessories shall comply with the

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5.3. The installation of PVC trunking shall be carried out in strict compliance with

the recommendations of the manufacturer.

5.4. Allowances shall be made for expansion of the trunking by using washers at

all fixing points.

5.5. Separate circuit protective conductors shall be used throughout the system for

earthing purposes.

5.6. All jointing shall be carried out using vinyl cement glue in compliance with

manufacturer’s recommendations.

6. GALVANIZED STEEL TRUNKING INSTALLATIONS

6.1. Heavy gauge galvanized sheet steel trunking of approved manufacture and of

minimum thickness 1.6 mm may be used in lieu of multiple conduit runs. The trunking shall be rigidly supported along their entire lengths at intervals not exceeding 1 m. On horizontal runs the lid or cover plates shall always face upwards.

6.2. All galvanized steel surface trunking, fittings, bends, tees, cable retainers,

cable separators, reducers, supports and other accessories shall comply with the requirements of BS 4678-1:1971. These shall be rust-proof and shall be complete with external fixing lugs. Site fabricated accessories shall not be allowed under any circumstances.

6.3. The lids or access plates shall be removable in easily-handled sections over

the entire length of straight runs of trunkings. Overlapping collar sections or other similar approved linking arrangement shall be provided at the junction of adjacent sections of the trunking.

6.4. All fittings and accessories shall be installed to ensure there are no sharp

edges, projecting screw threads or similar points within the trunking that may result in damage to the cables.

6.5. All under-floor steel trunking shall comply with the requirements of BS

4678-2:1973. These shall be rust-proof and shall be complete with external fixing lugs.

6.6. Thickness of steel sheets for different sizes shall be as follows :

i) Sizes up to and including 50 x 50 mm 20 SWG

ii) Sizes from 50 x 50 mm to 75 x 75 mm 18 SWG

iii) Sizes from 75 x 75 mm to 225 x 150 mm 16 SWG

6.7. Lengths of trunking shall be efficiently bonded to each other using strip

copper links not less than 12 mm x 2 mm and fixed with brass nuts and bolts and serrated washers. All lengths shall be connected by “Fish Plate” connectors. All trunking shall be supplied with cable retaining straps at intervals of 1 m.

6.8. Trunking run horizontally shall be provided with cable separators with

insulated pins at 1 m intervals. Trunking run vertically shall be provided with a cable support unit with insulated pins at 3 m intervals.

6.9. Where trunking passes through floors and walls, fibreglass or an approved

ceramic fibre packing shall be fixed into trunking to form effective fire barrier.

6.10. Under no circumstances cutting and bending of trunking to form flanges and attachments shall be permitted.

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7. CABLE TRAYS

7.1. All cable trays shall be constructed of hot dip galvanized and perforated sheet

steel complying with the requirements of BS 1449:1.1:1991.

7.2. Cables trays shall be supplied in nominal 2.4 m lengths and shall be of the

return flange type.

7.3. Trays up to but not including 150 mm width shall be of thickness 20 SWG.

Tray of width 150 mm to 375 mm shall be of thickness 16 mm SWG. Trays of width 400 mm to 600 mm shall be of thickness 14 SWG.

7.4. Sections of trays shall be jointed using 6 mm diameter mushroom-headed

safety bolts and nuts complying with the requirements of BS 1449.

7.5. Adequate copper earthing strips shall be fitted at every joint.

7.6. Holes cut in trays for passage of cables shall be suitably bushed.

7.7. Cables shall generally be fixed to and supported by perforated galvanized

sheet steel trays either wall mounted or suspended and supported from ceilings by sturdy galvanized iron brackets. Cables shall be clipped to trays by nylon or plastic cable ties.

7.8. Plastic or stainless steel trays shall be used in high corrosion areas.

8. CABLE LADDERS

8.1. All cable support ladders shall be manufactured from pre-galvanized steel

sheet, of minimum thickness 2 mm, complying with the requirements of BS 449-2:1969.

8.2. Ladders shall be hot-dip galvanized to comply with the requirements of BS

729:1971, and shall be suitable for installation in humid conditions prevailing in the U.A.E.

8.3. The rungs of ladders shall be supported on either ends by hexagonal profiled

steel sheet channels.

8.4. In both horizontal and vertical runs the ladders shall be firmly secured to

walls or suspended from ceilings by brackets to ensure they are able to withstand the weight of cables.

8.5. Where ladders are mounted on walls, a minimum distance of 25 mm shall be

maintained between walls and cable surfaces.

8.6. Where ladders are run horizontally supported by cantilevers or other devices,

the spacing of the latter shall be in compliance with manufacturer’s recommendations.

8.7. The width of ladders shall be adequate to ensure that the minimum spacing

between surfaces of adjacent cables shall be minimum the diameter of the larger cable.

8.8. The ladders shall be connected to earth and electrical continuity shall be

maintained throughout their entire lengths.

8.9. The installation shall be complete with all accessories inclusive of necessary

joints, coupling, bends, support brackets, wall and ceiling plates, mounting rails, take off hooks etc., all manufactured by the manufacturer of the ladders.

8.10. For aesthetic reasons, factory fabricated covers of suitable dimensions shall be fixed below horizontally run ladders, with minimum 30 mm spacing between cable surfaces and covers, throughout their routes, particularly in open areas like garages.

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9. UNDERFLOOR DISTRIBUTION SYSTEMS

9.1. Wherever required and indicated in drawings, the Contractor shall supply and

install one of the following underfloor trunking/ducting cable distribution systems, which shall be complete with all essential components and accessories:

i) Under floor trunking/ducting laid in screed.

ii) Under floor trunking/ducting cast in-situ into the structural slab. iii) Flush floor cable trunking/ducting.

9.2. The selected system shall comprise:

i) High-quality corrosion-resistant trunking/ducting manufactured from

hot-dipped zinc coated low carbon sheet steel complying with the requirements of BS EN 10142:2000, or uPVC trunking/ducting complying with the requirements of BS 4678-4: 1982.

ii) Robustly designed high-pressure, load-bearing, corrosion-resistant

die-cast zinc alloy floor service and junction boxes in compliance with the current EN Standards.

iii) Electrical power, voice, data and video socket outlets, complete with

wiring, cabling and all necessary accessories.

9.3. To achieve high degree of flexibility, the layout of the trunking system shall

be based on a grid pattern.

9.4. Galvanized steel ducts may be of single compartment or of multiple

compartment type with metallic segregation between power and other ELV cables. Alternatively, single uPVC ducts may be used for providing insulated enclosures for the different services.

9.5. All installation works shall be carried out by skilled and experienced

personnel in strict compliance with manufacturer’s installation guidelines and recommendations, and in close co-ordination with the Main Civil Contractor.

9.6. Prior to placing order for equipment and materials and prior to commencing

any installation works, the Contractor shall submit, for Engineer’s study and

written approval, manufacturer’s installation instructions, schedule of

materials and detailed workshop drawings showing layout of trunking, floor service outlet and junction boxes.

9.7. For Inscreed systems, the recommended dimensions of service outlet boxes

and junction boxes shall be 300 x 300 x 75-90 mm.

The boxes shall have provisions for access of ducting from all four sides, and all unused entries shall be plugged with detachable side blanks.

The covers of boxes shall be designed with 6 mm recess to receive tiles, carpets etc.

The service boxes shall be equipped with suitable hinges designed to enable the trap cover to open through 180 degrees and to give free access at all times to power, voice and data outlets.

All boxes shall be adjustable in height independently of the ducting system to account for the difference in floor thickness.

Adequate measures shall be provided to ensure protection of all emerging cables against damage.

All boxes and covers shall be equipped with waterproof gaskets and circuit protective conductors.

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9.8. For Raised floor systems, the trunking shall comprise of triple compartment

rectangular steel structure designed to serve as main feeder for distribution of power, voice and data cables. The recommended depth of the trunking shall be 38 mm and it shall be complete with covers, compartment segregators and earthing continuity studs for each length. The thickness of the trunking, segregators and junction boxes shall not be less than 1.2 mm.

Service boxes shall be constructed from galvanized sheet steel and shall be complete with polyamide trap frame with a carpet trim to cover carpet edges. The traps shall be designed to accommodate 7 mm thick carpet.

SPECIAL REQUIREMENTS AND INSTRUCTIONS

The Contractor shall liase with the specialist sub-contractors for CCTV and ACCESS CONTROL SECURITY Systems, FIRE DETECTION and VOICE ALARM SYSTEM, and STRUCTURED CABLING SYSTEM and provide all containment systems in strict compliance with their respective requirements.

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Low Voltage Cables, Wires and Accessories

Page 1 of 4

ELECTRICAL INSTALLATION WORKS

SECTION - 16123

LOW VOLATGE CABLES, WIRES AND ACCESSORIES

The contractor shall supply, install, test and connect all cables and wires, commencing from the Main Distribution Board, designated MDB, to sub-main Distribution Boards, designated SMDB, and thence final sub-circuit MCB Distribution boards, designated DB, to isolators for water and fire fighting pumps, lifts, A/C condensing units etc., all in compliance with these Specifications and details in single line power distribution schematic drawing and respective load schedules for various boards.

1. GENERAL.

1.1. Unless specified otherwise, copper conductors of 600/100 V insulation grade shall be used for all cables. All cables shall be adequately protected in finishes.

1.2. No joints shall be permitted in cable runs between any two points unless lengths involved are longer than standard manufactured lengths. The joints, if any, and their positions shall be approved by the Engineer.

1.3. Cable lugs, terminals and sweating sockets, all manufactured in strict compliance with the requirements of BS 91:1998, including latest amendments, shall be of correct bores appropriate to the sizes of cables to be connected. The bore shall be of adequate diameter to accommodate all strands of cable’s core as filling-in of surplus space with solder shall not be permitted. All soft solder used in cable installation shall comply with the requirements of BS 219:1977 Grade E or F for tinning and Grade H for wiped joints.

1.4. In general, routes of various cables shall be indicated in the cable routes drawing for tendering purposes only. The final routing shall, however, be approved by the Engineer before any installation is undertaken.

1.5. All works associated with installation of cables shall include jointing material, cable supports, cleats, brackets, perforated cable trays, ladders etc. together with all necessary accessories.

1.6. L.V. cables from transformer to MDB shall be supplied and installed by the Dubai Electricity and Water Authority.

1.7. Without prior approval of the Engineer, the Contractor shall neither drill any steelworks nor weld any part, component or device to the steelworks to provide support to the cables.

2. INSTALLATION OF CABLES.

2.1. In general, cables from MDB to SMDBs and from SMDBs to Final MCB

distribution boards, isolators etc. shall be drawn in appropriate size uPVC conduits, trunking or ducts cast in concrete floors, trenches, or run on perforated sheet steel cable trays/ladders along routes to be finalized on site.

2.2. External cables laid direct in ground shall be drawn in suitable and

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Page 2 of 4

etc. The diameter of uPVC pipes shall generally be between 100 mm to 150 mm.

2.3. Final sub-circuit wiring shall be drawn in conduits or trunking. In general, the

installations shall be concealed within the building fabric. However, in general service areas, workshop, plant rooms, main electrical room etc., the installation may be surface mounted.

2.4. In all horizontal and vertical runs of cables along walls, beams, columns,

service ducts, air-wells etc., all cables shall be supported by “Claw” type cleats or by ladders in compliance with recommendations in BS 7671:2001. For vertical runs, the spacing between adjacent cables shall be minimum twice the diameter of the larger cable. The spacing between wall and cables shall be minimum 25 mm.

2.5. Bends in cables shall be properly supported and shall be of the maximum

possible radius in the space available. The internal radius of every bend shall not be less than the recommended value in BS 7671:2001.

2.6. Prior to commencing installation works, the Contractor shall submit, for

Engineer’s study and approval, the proposed method of installation of cables in each area. The submission shall be complete with working drawings with all details and dimensions for ducts, openings, chases, trenches etc. and supports for cables.

2.7. The Contractor shall provide numbered brass or plastic discs at each end of

every cable run for easy identification of cables.

3. CROSS-LINKED POLYETHYLENE (XLPE) INSULATED COPPER

CABLES

3.1. All thermosetting cables specified shall be of 600/1000 V insulation grade

conforming to the requirements of BS 5467:1997, including latest

amendments.

3.2. The Conductors shall be stranded and of plain annealed high-conductivity

electrical copper complying with the requirements of BS 6360:1991, IEC 228.

3.3. All 4-core cables specified shall have the conductors insulated by XLPE

compound, and the core insulation shall be colored Red, Yellow, Blue and Black for identification. The bedding for the four cores shall be PVC compound over which a single layer of galvanized steel wire shall be provided as armour. The final serving over the armour shall be extruded PVC sheath of black colour.

3.4. PVC compound used for bedding and sheath shall comply with the

requirements of BS 6746:1990.

3.5. XLPE insulated cables with low emission of smoke and corrosive gases

under fire conditions shall comply with the requirements of B.S. 6724:1997 for armoured cables and B.S. 721:1998 for non-armoured cables.

3.6. XLPE insulated 300/500 V multicore cables with limited circuit integrity

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Page 3 of 4

4. POLYVINYL CHLORIDE (PVC) INSULATED ARMOURED AND

NON-ARMOURED COPPER CABLES :

4.1. All PVC insulated, single wire armoured/non-armoured PVC sheathed

multicore cables with stranded copper conductors shall conform to the requirements of BS 6346: 1997, including latest amendments.

4.2. Particulars related to specification of copper conductors, core colour codes,

bedding, sheath etc. shall be the same as for those described for XLPE cables under Item 6.3 above.

4.3. PVC compound used for insulation, bedding and sheath shall comply with the

requirements of BS 6746:1990.

5. PVC INSULATED PVC SHEATHED NON-ARMOURED COPPER

CABLES.

5.1. All single and multicore PVC insulated PVC sheathed non-armoured cables

of insulation grade 450/750 V with copper conductors shall comply with the requirements of BS 6004 : 2000.

5.2. Particulars relating to specifications of copper conductors, PVC compound

etc. shall be the same as for those described for XLPE cables under Item 6.3 above.

6. FLEXIBLE CORDS AND CABLES

6.1. All insulated flexible cords and cables shall be of 300/500 V grade complying

with the requirements of BS 6500:2000.

6.2. All insulated flexible cords and cables for use in high temperature zones shall

comply with requirements of B.S. 6141:1991.

6.3. Final connections to luminaires and pendants shall employ cables suitable for

continuous temperature of 150 deg.C. The cables shall have nickel-plated conductors and shall be double fibre glass wrapped, braided and silicone varnished.

6.4. Final connections to heating equipment, and where otherwise subjected to

heat, shall be silicone rubber insulated multicore cables suitable for continuous temperature of 150 deg. C.

7. FIRE ALARM AND EMERGENCY LIGHTING CABLES.

Thermosetting insulated flexible cords and cables shall be of 300/500 V grade complying with the requirements of BS 7629: 1993 and BS 6387:1994 Category CWZ. These cables shall be designed for reduced flame propagation, for low smoke and corrosive gas emission, and shall be surge, moisture, abrasion and damage resistant.

8. RUBBER INSULATED CABLES

Rubber insulated cables for electrical power and lighting shall comply with the requirements of BS 6007:2000.

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Page 4 of 4

9. CO-AXIAL CABLES.

Low-loss co-axial cables conforming to the requirements of BS: 5425:1986 shall be used for Satellite/Terrestrial Master TV antennae system.

10. MINERAL INSULATED METAL SHEATHED COPPER CABLES.

10.1. Mineral insulated copper sheathed copper conductor cables with rated voltage not exceeding 750V, with or without an overall high-grade PVC sheath, shall conform to the requirements of BS 6207-1:1995.

10.2. All terminations for mineral insulated cables shall comply with the requirements of BS 6207-2:1995.

10.3. All works shall be carried out in strict compliance with the manufacturer’s recommendations and in compliance with BS 6207-3:1995. The Contractor shall ensure that all installation works shall be carried out by qualified and specialist personnel who shall have received an approved course of instructions in the termination and installations of mineral insulated cables.

11. CABLE TERMINATIONS.

11.1. All cables shall terminate in glands recommended by the cable manufacturer. An earth tag shall be provided to facilitate fitting of earth bonds to the frames of equipment. A PVC shroud shall be fitted over each gland.

11.2. All terminations shall be carried out using a system of compression jointing as recommended by the cable manufacturer.

11.3. Special protective bushes shall be used at points where cables pass through metal surface such as distribution boards and trunking.

12. BINDING AND IDENTIFICATION SLEEVES

Binding and identification sleeves for use on electric cables and wires shall comply with the requirements of BS 3858:1992.

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1

-Building infrastructure standards – V4 www.du.ae infrastructure for supporting telecommunications services in the UAE. The document is to help building developers deliver high quality, future proof facilities that comply with du’s Fibre technology (FTTX) network standards. To ensure this compliance du requires building developers to go through a ‘No Objection Certificate’ (NOC) process, to submit to sites inspections and to provide material samples for testing. Please contact du for more details about the NOC process.

The guidance in this document is based on international standards and du’s extensive experience in offering telecommunications services. du always advises its clients to use qualified and certified professionals in all aspects of telecommunication infrastructure design, installation and commissioning.

It is recommended to engage with du at an early stage in any development so that process and design issues can be explained. du welcomes questions from developers so that it can always offer the best advice and information.

It is important to note that if a building developer or tenant has special needs or enhanced requirements that may require modifications to these guidelines du must be consulted at the design stage. In exceptional cases du may need to increase the requirements specified in this document to be able to offer service.

This document covers the following building types: • Single villas and villa complexes

• Residential towers and groups of residential towers • Commercial towers and groups of commercial towers • Shopping malls

• Group of shops or retails outlets

• Hospital, hotels and other bulk service applications • Warehouses and sheds

The document is structured so as to provide clear sections on all aspects of the infrastructure • Telecommunication spaces

• Pathways

• Electro-Mechanical • Cables

• Duct entry

All telecom spaces, pathways, ducts and cabling system specified in this document are for the exclusive use of du.

Emirates Integrated Telecommunications Company PJSC (EITC) Building infrastructure standards – V4

July 2008 www.du.ae

The contents of this document are subject to revision without notice due to continued progress in methodology, design and manufacturing.

There are separate documents that cover developing outside plant (OSP) for master plans. Please contact du if you require more information on such cases.

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- 2 - 3

-Building infrastructure standards – V4 www.du.ae Building infrastructure standards – V4 www.du.ae

A number of telecom rooms will be required in a building depending on the characteristics of the building. The following room types are required and the details of these rooms are included in the text below and summarised in Appendix 1.

• Main telecom room • Mobile-service room • Roof-top mobile-service room • Floor telecom closet

The height measurements specified are the minimum finished clearance after taking into account allowances for raised floors, overhead cable trays and any other obstructions. In the case that overhead trays are used a minimum headroom access of 300mm is required above the tray. In multi-story buildings the telecom rooms should be vertical aligned and linked by a shared containment system. This containment system must not reduce the minimum requested space. All telecom rooms must be dedicated to the use of du. The rooms must be easily accessible to du personnel 24 hours a day and secured from unauthorised entry.

Telecom rooms must not be in close proximity to any sources of the following: • Heat

• Moisture

• Corrosive atmospheric or environmental conditions • High voltages,

• Radio frequency interference (RFI) • Electro-magnetic interference (EMI)

The rooms must not be directly beneath or next to wet areas such as: • Showers

• Washrooms • Swimming pools • Garbage areas

If for any reason it is proposed that any part of a telecom room will be located below the water table then this must be raised at the design stage. This situation will require a floor drain fitted with an automatic submersible pump to counter any risk of water ingress.

The rooms should be clean and free from any items not directly related to the specifications in this document such as:

• Equipment • Utility pipes • Cables • Sprinkler systems • Windows • Pests

All telecom spaces and pathways must be pest controlled using best available practices. In the case of pests it should be noted that rodents often gnaw cables resulting in damage and the potential of service disruption. Special attention should be given to preventing rodents entering telecom spaces

The walls, floor, and ceiling of telecom rooms must be finished so as to minimize dust and static electricity. Walls and ceilings shall receive primer and finish coat of light colour paint.

In order to move equipment into and out of telecom rooms no access from outside of the building to these rooms should be less than 900mm x 2100mm (WxH)

A telephone socket must be provided in each area of the telecom rooms wired to the building telephone system.

Safety and other considerations

All telecom rooms must comply with all municipality and national authority standards and regulations; such as those issued by civil defence and utility companies. Notwithstanding this, it is expected that following will be provided:

• All telecom spaces should be fitted with smoke detectors connected to the building management system.

• All telecom spaces should be fitted with normal and emergency lighting.

• All containment openings to telecom spaces must be sealed with a regulation fire retardant material.

• All doors to telecom rooms must be of solid wood core or steel construction, fire retardant with a minimum rating of 2 hours. All doors to telecom rooms must be outward opening with an automatic door closer system fitted on the hinged edge.

• All doors to telecom rooms must be labelled. Details of the labeling scheme are given in Appendix 2.

• The room must free from contaminants and pollutants as defined in Appendix 3.

• All telecom rooms should have basic fire fighting provision of two handheld CO2 cylinder type extinguishers.

Temperature and humidity

All the telecom rooms, with the exception of the floor telecom closets, must be provided with an air conditioning system to main the temperature at 20°C ± 3°C and the relative humidity at 50% ± 10%. To enable the building developer to design the air conditioning system the maximum heat dissipation of the equipment in the various room types is given in Appendix 1

Whilst the detailed design of the air conditioning system is the responsibility of the building developer the following design principles must be followed:

• Dedicated duty and stand-by units

• Units interlocked based on sensing power failure or over temperature. • Stand-by unit connected to emergency electrical supply

• All units located outside the telecom rooms

• Both units connected to the building management system • Air flow to feed each telecom space via dedicated ducting