Mep Specifications

CCHHCC

PPRROOJJEECCTT

ACES PROPERTY LIMITEDPROPOSED BUILDING (G+4+R)

ELECTRICAL SPECIFICATIONS

Prepared by

April , 2014


SPECIFICATIONS ELEC/SPEC.16000.

SECTION DESCRIPTION

16000 SCOPE AND EXTENT OF WORKS16010 GENERAL REQUIREMENTS AND CONDITIONS16110 CONTAINMENT SYSTEMS FOR WIRING AND CABLING CONDUITS,

TRUNKING, TRAYS, LADDERS, DUCTS AND UNDER FLOOR TRUNKING16123 LOW VOLATGE CABLES, WIRES AND ACCESSORIES161241 DU GUIDELINES161242 TELEPHONE AND CABLE TV SYSTEMS16141 WIRING ACCESSORIES16170 EARTHING SYSTEM16411 LOW VOLTAGE AUTOMATIC POWER FACTOR CORRECTION PANEL16426 LOW VOLTAGE ELECTRICAL SWITCHGEAR, MAIN, SUBMAIN AND FINAL

DISTRIBUTION BOARDS, ISOLATORS AND LOADBREAK SWITCHES16510 LIGHTING FIXTURES AND ACCESSORIES16511 LIGHTING CONTROL SYSTEMS1672116770 ANOLOGUE ADDRESSABLE VOICE INTEGRATED FIRE DETECTION AND

ALARM SYSTEM16780 CENTRALLY MONITORED SELF CONTAINED EMERGENCY LIGHTING

SYSTEM16781 MASTER DIGITAL SATELLITE AND TERRRESTRIAL ANTENNAE

SYSTEM16782 CLOSED CIRCUIT TELEVISION AND VIDEO SECURITY SURVEILLANCE

SYSTEM167821 INTERCOM SYSTEM DIGITAL AUDIO INTERCOM16783 SOLAR WATER HEATER SYSTEM

VENDOR LIST

File: ELECSPEC16000.doc Page 1 of 1



File: ELECSPEC16000.docScope and Extent of Works

Page 1 of 3

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 theproject design is proposed to be B+G+4 Residential with Retail Buildingfor 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 belowand 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 forfamiliarization with all site conditions and scope of works.

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

1.5. The Contractor shall be responsible for obtaining approvals for all workshopdrawings from respective statutory authorities prior to commencing execution ofany works.

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

1.7. The Contractor shall be responsible for coordinating with Dubai Electricity andWater Authority (DEWA) for making all necessary arrangements for provision ofH.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 hisoffer, except the power connection charges, which shall be paid by the Client.

1.8. Contractor shall be responsible to comply with Dubai Municipality and DEWAGreen 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 compliancewith details in relevant drawings, Specifications, Schedules of Luminaries, Scheduleof 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 4Type 6, complete with kilo-watt-hour meter, ammeters, voltmeter/selectorswitches, cable glands, other necessary accessories etc. The MDB shall becomplete with Power Factor Correcting Panel, designated as PFCP, housed in anindependent enclosure, which shall not form an integral part of the MDB.


Page 2 of 3



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 andother similar equipment, all in compliance with details in drawings.

2.6. All L.V. cabling/wiring between MCB boards and respective outlet pointsassociated with internal and external lighting points, exhaust fans, generalpurpose socket-outlets, hand dryers, isolators etc., all in strict compliance withdetails 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 unitswith manual override facility for control of external lighting and roofprojection 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 fromrespective Voice Data distributors, trays from main distributor to sub-maindistributor, all in coordination with and to the requirements of the specialistsub-contractors who shall be responsible for supply and installation of allstructured cabling equipment, voice and data socket outlets and cabling.

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

2.17. High quality, high performance integrated Security System comprising CCTVand Card Access Control System complete with all necessary containmentsystem, components and accessories deemed essential for a safe and reliableSecurity System.

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

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


Page 3 of 3



2.20. High quality high performance Satellite Master Antennae System forintegration with the structured cabling system.

2.21. High quality high performance intelligent lighting control system for controlof lighting circuits in respective public areas, Libraries, Multipurpose Hallsetc.

2.22. Complete earthing system, inclusive of clean earthing for Telecommunicationrooms.

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

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

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

END OF SECTION 16000


File: ELECSPEC16010.docGeneral Requiremenst and Conditions

Page 1 of 8



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 theelectrical installation works for the project, all in compliance with the General andParticular Specifications and Drawings

1.2. Prior to bidding, the Contractor shall be required to visit the site to ascertainlimitations or constraints that may affect his works on site. In addition theContractor shall study the Specifications and tender design drawings in detail asno variations shall be allowed due to lack of knowledge relating to site conditionsand drawings implications.

1.3. The General and Particular Specifications shall be read in conjunction withthe Contracts Documents and Tender drawings. In the event of anydiscrepancies between the drawings and the Specifications, the drawings shallbe deemed correct for tendering purposes. The Contractor shall, however, berequired to draw attention to such discrepancies at the time of submitting hisoffer.

1.4. All electrical installation works shall be carried out in strict compliance withdetails in drawings, load schedules for distribution boards, Schedules ofequipment 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 modernpractice and shall be carried out by fully competent tradesmen of appropriategrades to the full satisfaction of the Engineer.

1.6. All equipment and materials shall be installed to guarantee satisfactoryoperation at specified parameters.

1.7. To avoid delays and to facilitate smooth running of the works, the Contractorshall 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 anddefects shall be used. Any equipment and material not accepted by theEngineer shall be removed and replaced by the Contractor at his own expense.

1.9. The Contractor shall ensure all equipment, accessories and components are ofappropriate protection grade for installation in various areas, taking intoaccount 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 Contractorshall submit Quality Inspection Plan for all items for Engineers study andreview.



Page 2 of 8


1.11. All equipment shall be manufactured by reputable manufacturers ofinternational repute with ISO 9001 accreditation. The manufacturers shouldhave been regularly engaged in the manufacture of respective items for atleast ten years, and their products have been used satisfactorily in similarprojects.

1.12. The Contractor shall submit original documents of origin of country of allrespective equipment and materials proposed for the project. In addition, Billof 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 shallcomply with the requirements of the latest edition of the relevant InternationalElectro-Technical Commission (IEC) publications, British Standards (BS), andNFPA.All electrical installation works shall be carried out in strict compliance with currentrules, regulations, requirements and recommendations of the following institutes andstatutory 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 theinstallations shall be suitable for use in the climatic conditions prevalent in Ajman asdetailed 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 theinstallations shall be designed and manufactured to operate safely and continuously inthe electricity supply system provided by DEWA with the following characteristics:

Voltage : 380V +/- 5%, 3 phase, 4-wireFrequency : 50 Hz +/- 2%

Neutral : solidly earthed, TNT systemFault level : 20 MVA, supplied from a 1000 kVA transformer



Page 3 of 8


30 MVA, supplied from a 1500 kVA transformerFault 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 arrangementsfor the supply and installation of all high-voltage equipment for connection ofelectricity supply for the project.

5.3. The contractor shall coordinate with ETISALAT to obtain all relevantinformation, data and instructions pertaining to telephone, voice and datasystem installation works.

5.4. The Contractor shall coordinate with the local Civil Defense Authority toobtain all relevant information, data and instructions pertaining to installationworks for Fire Detection and Alarm system.

5.5. Prior to commencement of any installation works, the Contractor shall submitspecified number of copies of drawings to relevant authorities for checking,comments and approval. Any modifications or additional requirements by therelevant authority shall be brought forthwith to the attention of the Engineerfor further action and compliance.

5.6. To avoid unnecessary delays, the Contractor shall arrange for inspection ofworks by the relevant authorities on an on-going basis during the course ofworks.

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

6. CO-ORDINATION WITH OTHER TRADES AND SUPPLIERS.

6.1. The contractor shall coordinate with the plumbing works sub-contractor toascertain locations and routes of all water and drainage pipes to ensuresufficient and safe clearances are maintained between these and electricalservices 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 equipmenthave been stipulated after coordination at the design stage with the Plumbing andMechanical Engineers. However, the Contractor shall be required to coordinatewith the concerned sub-contractors and manufacturers of proposed equipment andsupply and install suitable isolators of correct ratings to match requirements ofequipment finally selected for installation.

6.3. The Contractor shall coordinate with the suppliers and installers of allspecialist equipment inclusive of false ceilings; A.C. equipment and ductwork; 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. tofacilitate, wherever applicable, correct and satisfactory installation ofcontainment network comprising conduits, trunking, trays etc. for pointsassociated with the respective systems.



Page 4 of 8


6.4. Layout of A.C. grills, fire alarm detectors, sound system speakers, emergencylighting luminaires, indoor and outdoor CCTV cameras, Access ConrolSecurity System clearances above false ceilings etc. shall be fully coordinatedwith other trades for proper and satisfactory siting of lighting fixtures in thefalse ceilings.

6.5. Prior to commencement of any works, the Contractor shall liase with all othersub-contractors for all services and submit co-ordinated drawings to theEngineer for his study, comments and final approval.

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

7. TENDER DRAWINGS AND POSITIONS OF FITTINGS.

7.1. Approximate locations of various items of electrical equipment inclusive ofwiring accessories, lighting luminaires, isolators, distribution boards, panelsand components of Fire Detection and Alarm system, Structured CablingSystem, Telephone System, CCTV System, P.A. System, Access ControlSecurity System etc. indicated in the drawings shall be assumed to becorrect for tendering purposes only, and are intended to indicate generalrequirements and arrangement of aforementioned equipment and accessories.Locations of items of electrical equipment may be changed on site to complywith 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 architecturaland structural drawings. Elevations for all services shall be verified prior tocommencement of any electrical installation works.

8. CONSTRUCTION DRAWINGS

8.1. Four sets of tender drawings for all electrical works shall be provided to theContractor. Any necessary design modifications shall be in the form of designnotes and / or sketches as directed by the Engineer.

8.2. To facilitate satisfactory execution of electrical installation works and to avoidany conflict with other trades and services, the Contractor shall be responsiblefor preparing all relevant coordinated construction drawings.

8.3. The Contractor shall submit, within thirty days of Engineers instructions forcommencement of works, three copies of drawings indicating dimensioneddetails of sleeves, openings, holes, chases etc. required in the structure; pipingand equipment in shafts; piping and equipment in mechanical and plant roomsand other critical areas; equipment foundations; trenches; anchors; inertiaslabs 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 constructiondrawings approved and stamped by all other trades shall be submitted to theEngineer.


Page 5 of 8



9. WORKING AND AS FITTED DRAWINGS AND OPERATING MAUALS

9.1. During the course of the works the contractor shall maintain a fully detailedrecord of all changes to the Tender Drawings as true record of actualinstallations.

9.2. The drawings shall show the complete electrical installation works of allelectrical systems within and external to the building, inclusive of the type,cross- sectional areas and runs/lengths of all L.V. cables, the precise locationsof all cables which may be buried within the structure, and those sections ofany external cables which are buried directly in the ground.

9.3. The locations and depths of all underground cables and uPVC conduits forincoming ETISALAT cables at the various entry points shall also be clearlyindicated.

9.4. The Contractor shall be fully responsible for the accuracy of dimensions of allequipment with respect to space available, for accessibility of equipment formaintenance 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 obligationsand any delay shall be subject to penalties and other remedies as determined bythe Engineer.

9.6. Within one month of completion of the installations, the Contractor shallprovide 3 No. complete sets of the following record drawings for all abovementioned systems, as detailed below, for Engineers study, comments and finalapproval :

i) General arrangement of all electrical services AS FITTED, to scalenot less than 1:100 metric.

ii) Details of all items of plant and equipment including name and addressof respective manufacturer, type and model, serial number, duty, ratingand 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, controlpanels etc. with relevant notes describing their functions.

9.7. After obtaining approval in writing for the drawings, the Contractor shallprovide one negative and two prints of each drawing together with two boundsets of all manuals and operating instructions to the Engineer for issuing theseto the Client.

10. PERSONNEL TRAINING

10.1. Prior to acceptance of the works, the Contractor shall be required to train andinstruct Clients personnel in the correct use, operation and supervision ofFire Detection and Alarm System, Sound System, CCTV System and anyother system installed in the building.

10.2. Prior to acceptance of the works, the Contractor shall also be required todemonstrate and explain to the clients personnel the correct operation of allitems of switchgear and the starting, running and stopping of all item ofmechanical plant installed in the building.


Page 6 of 8



10.3. The cost of the training programme shall be deemed to be included in theContract price.

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

11. ALTERNATIVE EQUIPMENT AND MATERIALS

11.1. As a guide to the quality of workmanship required, names of threemanufacturers together with technical details and, wherever applicable,catalogue number shall generally be specified for each item in the Schedule ofLuminaires, Equipment and Materials.

11.2. Clients list of recommended and preferred manufacturers for lightingfixtures, wiring accessories, switchgear, cables, busbar ducts and otherrelevant equipment, materials and System shall be provided.

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

12. INSPECTION, TESTING AND COMMISSIONING

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

12.2. The Contractor shall provide, free of charge, all necessary labour, materials,testing equipment and measuring instruments which may be required to carryout the various tests on the installations in compliance with therecommendations of the relevant statutory authorities and as directed by theEngineer.

12.3 The Contractor shall give fourteen days notice before the installation is readyfor inspection and testing. Subject to the Engineers agreement, the Contractormay proceed with the tests and forward three certified copies of the resultsobtained to the Engineer. If the results are found satisfactory in every respect,the installation shall be accepted, but such acceptance shall be without anyprejudice to any claims in respect of any defects which may develop during theguarantee period for maintenance.

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

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

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

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

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


Page 7 of 8



13. ELECTRICAL TESTS.

13.1. On completion of the installations and prior to its being made alive for service, theContractor shall carry out the recommended electrical tests, on all sections of theworks in the presence of the Engineer and the representative of the FederalElectricity and Water Authority.

13.2. All tests shall be carried out in strict compliance with the requirements andrecommendations 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 conductorsand 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 defectiveparts during the maintenance guarantee period from the date of handing over theproject.

15. SAMPLES.

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

16. SPARE PARTS.

In accordance with respective manufacturers recommendations, the contractor shallprovide, as part of the Contract, all special tools required for equipment maintenancetogether with list of spare parts deemed essential for two years, together withindividual prices of all items of spares.

17. NOTICES.

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

i) The instructions for the treatment of electric shock, in Arabic and Englishlanguages, mounted on a steel frame and screwed to the wall.


Page 8 of 8



ii) A schematic diagram of the switchgear located in the room together with acomplete single line schematic drawing of the complete electrical distributionsystem, framed and mounted on the wall.

18. LABELS AND IDENTIFICATION MARKS.

All equipment and apparatus shall be permanently marked with the manufacturersname, and shall also be identified by engraved labels to indicate the servicescontrolled or to identify individual apparatus or equipment. Labels shall be securelyfixed 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 inrespective load schedules in compliance with DEWAs requirements.

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

19.3. Lighting control switches shall be adequately rated to control respectiveinductive loads.

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

19.5. Final locations of all wiring accessories shall be determined in coordinationwith Architects instructions and in compliance with final furniture andequipment layouts.

19.6. All wiring shall be carried out in strict compliance with details in loadschedules of respective final MCB distribution boards.

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

19.8. All isolators shall be designed for heavy-duty service and shall comply withdegree of protection IP55 for internal and IP65 for external installations. Allisolators supplying motoring circuits shall conform with the requirements oftype AC23.

19.9. Where cables, bus-ducts, cable trays, trunking, ladders, conduits etc. passthrough fire rated floors, walk or roof, the Contractor shall provide internal andexternal fire sealant. For non-fire rated locations, the silicon sealants shall beused.



File: ELECSPEC16110.docContainment Systems for Wiring and CablingConduits , Trunking, Trays, Ladders

Page 1 of 8



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 systemcomprising conduits, underfloor trunking, cable trunking, trays, ladders and duct works invarious area of the premises for satisfactory, correct, orderly and segregated distribution ofwiring 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 inconspicuousmanner, and each system shall be completely assembled, inspected and testedprior to cables/wiring being drawn in them.

1.2. All works shall be carried out in strict compliance with the recommendationsof the manufacturer and with guidelines and recommendations in BS7671:2001, which incorporates the I.E.E. Wiring Regulations.

1.3. Notional routes of cables and other related instructions shall be indicated inthe drawings. However, prior to commencement of any parts of the works, theContractor shall be required to submit, for Engineers study and approval, twoprints of comprehensive working drawings indicating proposed routes ofconduits, trays, trunking, trays, ladders and ducts together with all relevantdimensional details.

1.4. All containment systems shall be supported and secured to the building fabricin a manner to ensure these are fully protected and have no load or stressesother 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 forrespective 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 strategicallylocated draw-in boxes, to allow easy drawing of any or all the cables. Careshall 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



Page 2 of 8


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

2.3. All conduits shall be run in a manner to facilitate self-draining to outletboxes. Each length of conduit shall be cleaned and dried with the help of aswab drawn through its length, and all boxes shall be cleaned to removemoisture prior to installing cables.

2.4. Conduit bends shall be made with the bore of the tube remaining full and freethroughout and all conduits shall be perfectly smooth inside and outside, andfree from any burrs and sharp corners. Bends shall be made without heatingthe conduits and by using approved type of bending machine or bendingblock to give results consistent with the best grade of craftsmanship.

2.5. No more than two right angle bends shall be permitted between draw-inboxes. No diagonal runs of conduits shall be allowed on the walls ofstructure. Conduits concealed in the ceiling slab shall run parallel to wallsand beams, and those concealed in walls shall be run vertical and/orhorizontal.

2.6. All conduits cast in concrete or laid in floor screeds shall be effectivelysecured, positioned and protected against mechanical damage, ingress ofconcrete etc. Allowance shall be made for thermal expansion and contractionof straight runs of conduits.

2.7. Where conduits run parallel to one another, the distance between adjacentconduits 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 100x 50 mm, shall be used. Maximum of 3 Nos. 20 mm diameter and amaximum of 2 nos. 20 mm diameter conduits shall enter the longer andshorter 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 minimumthickness of 15 mm plaster or other finish to be obtained. Ceiling boxes forlighting fixtures shall be brought flush with the ceiling plaster or finish. Themounting boxes for flush type switches, socket outlets etc. shall be recessedsquaring into the wall structure until the front edge is level with the finishedsurface of the plaster or other finish.

2.9. Conduits shall be terminated in accessories, distribution boards etc. either bybeing screwed into the tapped spouts or holes where such are provided, or bylocking into clearance holes by means of couplers and smooth borehexagonal male bushes. Connections between the conduits and box withclearance holes shall, in addition, be filled with a brass compression washerbetween the box and the coupling with no exposed thread.

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

2.11. Adaptable switch and socket-outlet boxes in 1-gang and 2-gang configurationshall be constructed of pre-coated galvanized steel complying with therequirements 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.



Page 3 of 8


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

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

2.15. Conduits passing through water-proof membranes shall be equipped with 50mm thick collars of appropriate thickness welded all around at membranelevel, with the membrane pressed over the collars. After installation ofconduits, 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 complyingwith the requirements of BS EN 50086-1:1994. Fittings and accessories shallbe of same manufacture as the conduits. Minimum thickness of wallscorresponding to respective outside diameter of conduits shall be as follows :

OUTSIDE DIAMETER WALL THICKNESS(mm) (mm)

20 1.825 1.932 2.538 2.5

3.2. All conduits shall be unthreaded, slip-fit and push-on type. Unless otherwisespecified only plain couplers shall be used. All joints shall be made withweather-proof adhesive as recommended by the manufacturer.

3.3. Terminations in metal equipment and accessories with a tapped entry shallemploy flanged couplings locked to the metal case with smooth borebrass/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 mmii) Hot water : 250 mmiii) Air ducts : 20 mm

4. GALVANIZED STEEL CONDUITS AND ACCESSORIES.

4.1. All metal conduits shall be heavy gauge welded screwed steel tubingcomplying with the requirements of BS 4568:PART 1:1970, and shall beheavily galvanized both inside and outside throughout their entire lengths.



Page 4 of 8


All conduit fittings and accessories shall be finished to the sameclassification 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 steelscrews, 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 closetogether in conduit coupling. Lock nuts shall be thoroughly coated with redlead after installation.

4.4. All conduits shall be mechanically and electrically continuous and shall beeffectively bonded and earthed. Earth connections and bonding to conduitsshall be by means of copper tape or copper earth wire and earthing clampscomplying with BS 951:1999. Where the conduit makes contact withstructural steel, an efficient and permanent bond shall be made between theconduit and metal work.

4.5. All conduit boxes shall be constructed of malleable iron or pressed steel andshall have the same classification for protection as for the conduit. Wherethey do not serve as outlets, they shall be fitted with lids secured with brassscrews. Earthing terminals shall be provided in all outlet boxes.

4.6. On completion of installations, the conduits shall be checked and allimperfections shall be made good. Rust, minor damage and exposed threadsin conduit runs installed on the surfaces shall be painted with two coats ofZinc Chromate paint and finished with approved air drying metallic paint.Conduits concealed in the building structure shall be painted with two coatsof air drying red lead paint. The paints shall be applied immediately after thecompletion of conduit installation.

4.7. Wherever there is likely to be excessive condensation, boxes shall be filledwith suitable plastic compound approved by the Engineer.

4.8. At all expansion joints in the structure an approved type of flexible slidingconnection shall be provided in every run of conduit to take up anyexpansion or contraction of the conduits under service conditions. Bondingacross the joint shall be maintained by separate circuit protective conductor.

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

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

5. PVC TRUNKING INSTALLATIONS

5.1. Rigid heavy gauge PVC trunking of approved manufacture may be used inlieu of multiple conduit runs. The trunking shall be rigidly supported alongtheir entire lengths at intervals not exceeding 1.25 m. All fixings shall becarried out with cadmium plated steel screws.

5.2. All PVC trunking, lids, fittings and accessories shall comply with therequirements of BS 4678-4:1982.



Page 5 of 8


5.3. The installation of PVC trunking shall be carried out in strict compliance withthe recommendations of the manufacturer.

5.4. Allowances shall be made for expansion of the trunking by using washers atall fixing points.

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

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

6. GALVANIZED STEEL TRUNKING INSTALLATIONS

6.1. Heavy gauge galvanized sheet steel trunking of approved manufacture and ofminimum thickness 1.6 mm may be used in lieu of multiple conduit runs. Thetrunking shall be rigidly supported along their entire lengths at intervals notexceeding 1 m. On horizontal runs the lid or cover plates shall always faceupwards.

6.2. All galvanized steel surface trunking, fittings, bends, tees, cable retainers,cable separators, reducers, supports and other accessories shall comply withthe requirements of BS 4678-1:1971. These shall be rust-proof and shall becomplete with external fixing lugs. Site fabricated accessories shall not beallowed under any circumstances.

6.3. The lids or access plates shall be removable in easily-handled sections overthe entire length of straight runs of trunkings. Overlapping collar sections orother similar approved linking arrangement shall be provided at the junctionof adjacent sections of the trunking.

6.4. All fittings and accessories shall be installed to ensure there are no sharpedges, projecting screw threads or similar points within the trunking that mayresult in damage to the cables.

6.5. All under-floor steel trunking shall comply with the requirements of BS4678-2:1973. These shall be rust-proof and shall be complete with externalfixing 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 SWGiii) 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 stripcopper links not less than 12 mm x 2 mm and fixed with brass nuts and boltsand serrated washers. All lengths shall be connected by Fish Plateconnectors. All trunking shall be supplied with cable retaining straps atintervals of 1 m.

6.8. Trunking run horizontally shall be provided with cable separators withinsulated pins at 1 m intervals. Trunking run vertically shall be provided witha cable support unit with insulated pins at 3 m intervals.

6.9. Where trunking passes through floors and walls, fibreglass or an approvedceramic fibre packing shall be fixed into trunking to form effective firebarrier.

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



Page 6 of 8


7. CABLE TRAYS

7.1. All cable trays shall be constructed of hot dip galvanized and perforated sheetsteel 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 thereturn 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-headedsafety 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 fromceilings by sturdy galvanized iron brackets. Cables shall be clipped to traysby 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 steelsheet, of minimum thickness 2 mm, complying with the requirements of BS449-2:1969.

8.2. Ladders shall be hot-dip galvanized to comply with the requirements of BS729:1971, and shall be suitable for installation in humid conditions prevailingin the U.A.E.

8.3. The rungs of ladders shall be supported on either ends by hexagonal profiledsteel sheet channels.

8.4. In both horizontal and vertical runs the ladders shall be firmly secured towalls or suspended from ceilings by brackets to ensure they are able towithstand the weight of cables.

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

8.7. The width of ladders shall be adequate to ensure that the minimum spacingbetween surfaces of adjacent cables shall be minimum the diameter of thelarger cable.

8.8. The ladders shall be connected to earth and electrical continuity shall bemaintained throughout their entire lengths.

8.9. The installation shall be complete with all accessories inclusive of necessaryjoints, coupling, bends, support brackets, wall and ceiling plates, mountingrails, take off hooks etc., all manufactured by the manufacturer of the ladders.

8.10. For aesthetic reasons, factory fabricated covers of suitable dimensions shallbe fixed below horizontally run ladders, with minimum 30 mm spacingbetween cable surfaces and covers, throughout their routes, particularly inopen areas like garages.



Page 7 of 8


9. UNDERFLOOR DISTRIBUTION SYSTEMS

9.1. Wherever required and indicated in drawings, the Contractor shall supply andinstall one of the following underfloor trunking/ducting cable distributionsystems, which shall be complete with all essential components andaccessories:

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 therequirements of BS EN 10142:2000, or uPVC trunking/ductingcomplying with the requirements of BS 4678-4: 1982.

ii) Robustly designed high-pressure, load-bearing, corrosion-resistantdie-cast zinc alloy floor service and junction boxes in compliancewith the current EN Standards.

iii) Electrical power, voice, data and video socket outlets, complete withwiring, cabling and all necessary accessories.

9.3. To achieve high degree of flexibility, the layout of the trunking system shallbe based on a grid pattern.

9.4. Galvanized steel ducts may be of single compartment or of multiplecompartment type with metallic segregation between power and other ELVcables. Alternatively, single uPVC ducts may be used for providing insulatedenclosures for the different services.

9.5. All installation works shall be carried out by skilled and experiencedpersonnel in strict compliance with manufacturers installation guidelines andrecommendations, and in close co-ordination with the Main Civil Contractor.

9.6. Prior to placing order for equipment and materials and prior to commencingany installation works, the Contractor shall submit, for Engineers study andwritten approval, manufacturers installation instructions, schedule ofmaterials and detailed workshop drawings showing layout of trunking, floorservice outlet and junction boxes.

9.7. For Inscreed systems, the recommended dimensions of service outlet boxesand junction boxes shall be 300 x 300 x 75-90 mm.The boxes shall have provisions for access of ducting from all four sides, andall 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 enablethe trap cover to open through 180 degrees and to give free access at all timesto power, voice and data outlets.All boxes shall be adjustable in height independently of the ducting system toaccount for the difference in floor thickness.Adequate measures shall be provided to ensure protection of all emergingcables against damage.All boxes and covers shall be equipped with waterproof gaskets and circuitprotective conductors.


Page 8 of 8


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


rectangular steel structure designed to serve as main feeder for distribution ofpower, voice and data cables. The recommended depth of the trunking shallbe 38 mm and it shall be complete with covers, compartment segregators andearthing 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 becomplete 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 INSTRUCTIONSThe Contractor shall liase with the specialist sub-contractors for CCTV andACCESS CONTROL SECURITY Systems, FIRE DETECTION and VOICEALARM SYSTEM, and STRUCTURED CABLING SYSTEM and provide allcontainment systems in strict compliance with their respective requirements.



File: ELECSPEC16123.docLow Voltage Cables, Wires and Accessories

Page 1 of 4



SECTION - 16123

LOW VOLATGE CABLES, WIRES AND ACCESSORIES

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

1. GENERAL.

1.1. Unless specified otherwise, copper conductors of 600/100 V insulation gradeshall 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 lengthsinvolved are longer than standard manufactured lengths. The joints, if any, andtheir positions shall be approved by the Engineer.

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

1.4. In general, routes of various cables shall be indicated in the cable routes drawingfor tendering purposes only. The final routing shall, however, be approved by theEngineer 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 withall necessary accessories.

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

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

2. INSTALLATION OF CABLES.

2.1. In general, cables from MDB to SMDBs and from SMDBs to Final MCBdistribution boards, isolators etc. shall be drawn in appropriate size uPVCconduits, trunking or ducts cast in concrete floors, trenches, or run onperforated 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 andappropriate sized uPVC conduits when crossing roads, footpaths, trenches



Page 2 of 4


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

2.3. Final sub-circuit wiring shall be drawn in conduits or trunking. In general, theinstallations shall be concealed within the building fabric. However, ingeneral service areas, workshop, plant rooms, main electrical room etc., theinstallation 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 typecleats or by ladders in compliance with recommendations in BS 7671:2001.For vertical runs, the spacing between adjacent cables shall be minimumtwice the diameter of the larger cable. The spacing between wall and cablesshall be minimum 25 mm.

2.5. Bends in cables shall be properly supported and shall be of the maximumpossible radius in the space available. The internal radius of every bend shallnot be less than the recommended value in BS 7671:2001.

2.6. Prior to commencing installation works, the Contractor shall submit, forEngineers study and approval, the proposed method of installation of cablesin each area. The submission shall be complete with working drawings withall details and dimensions for ducts, openings, chases, trenches etc. andsupports for cables.

2.7. The Contractor shall provide numbered brass or plastic discs at each end ofevery cable run for easy identification of cables.

3. CROSS-LINKED POLYETHYLENE (XLPE) INSULATED COPPERCABLES

3.1. All thermosetting cables specified shall be of 600/1000 V insulation gradeconforming to the requirements of BS 5467:1997, including latestamendments.

3.2. The Conductors shall be stranded and of plain annealed high-conductivityelectrical copper complying with the requirements of BS 6360:1991, IEC228.

3.3. All 4-core cables specified shall have the conductors insulated by XLPEcompound, and the core insulation shall be colored Red, Yellow, Blue andBlack for identification. The bedding for the four cores shall be PVCcompound over which a single layer of galvanized steel wire shall beprovided as armour. The final serving over the armour shall be extruded PVCsheath of black colour.

3.4. PVC compound used for bedding and sheath shall comply with therequirements of BS 6746:1990.

3.5. XLPE insulated cables with low emission of smoke and corrosive gasesunder fire conditions shall comply with the requirements of B.S. 6724:1997for armoured cables and B.S. 721:1998 for non-armoured cables.

3.6. XLPE insulated 300/500 V multicore cables with limited circuit integrityunder fire conditions shall comply with the requirements of B.S. 7629:1993.



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 sheathedmulticore cables with stranded copper conductors shall conform to therequirements 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 cablesunder Item 6.3 above.

4.3. PVC compound used for insulation, bedding and sheath shall comply with therequirements of BS 6746:1990.

5. PVC INSULATED PVC SHEATHED NON-ARMOURED COPPERCABLES.

5.1. All single and multicore PVC insulated PVC sheathed non-armoured cablesof insulation grade 450/750 V with copper conductors shall comply with therequirements of BS 6004 : 2000.

5.2. Particulars relating to specifications of copper conductors, PVC compoundetc. shall be the same as for those described for XLPE cables under Item 6.3above.

6. FLEXIBLE CORDS AND CABLES

6.1. All insulated flexible cords and cables shall be of 300/500 V grade complyingwith the requirements of BS 6500:2000.

6.2. All insulated flexible cords and cables for use in high temperature zones shallcomply with requirements of B.S. 6141:1991.

6.3. Final connections to luminaires and pendants shall employ cables suitable forcontinuous temperature of 150 deg.C. The cables shall have nickel-platedconductors and shall be double fibre glass wrapped, braided and siliconevarnished.

6.4. Final connections to heating equipment, and where otherwise subjected toheat, shall be silicone rubber insulated multicore cables suitable forcontinuous temperature of 150 deg. C.

7. FIRE ALARM AND EMERGENCY LIGHTING CABLES.

Thermosetting insulated flexible cords and cables shall be of 300/500 V gradecomplying with the requirements of BS 7629: 1993 and BS 6387:1994 CategoryCWZ. These cables shall be designed for reduced flame propagation, for low smokeand corrosive gas emission, and shall be surge, moisture, abrasion and damageresistant.

8. RUBBER INSULATED CABLES

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


Page 4 of 4



9. CO-AXIAL CABLES.

Low-loss co-axial cables conforming to the requirements of BS: 5425:1986 shall beused 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 voltagenot exceeding 750V, with or without an overall high-grade PVC sheath, shallconform to the requirements of BS 6207-1:1995.

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

10.3. All works shall be carried out in strict compliance with the manufacturersrecommendations and in compliance with BS 6207-3:1995. The Contractorshall ensure that all installation works shall be carried out by qualified andspecialist personnel who shall have received an approved course ofinstructions 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 framesof equipment. A PVC shroud shall be fitted over each gland.

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

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

12. BINDING AND IDENTIFICATION SLEEVES

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


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

INTRODUCTION

This document contains dus guidelines for the design, installation and commissioning of buildinginfrastructure for supporting telecommunications services in the UAE. The document is to helpbuilding developers deliver high quality, future proof facilities that comply with dus Fibre technology(FTTX) network standards. To ensure this compliance du requires building developers to go througha No Objection Certificate (NOC) process, to submit to sites inspections and to provide materialsamples for testing. Please contact du for more details about the NOC process.

The guidance in this document is based on international standards and dus extensive experience inoffering telecommunications services. du always advises its clients to use qualified and certifiedprofessionals in all aspects of telecommunication infrastructure design, installation andcommissioning.

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

It is important to note that if a building developer or tenant has special needs or enhancedrequirements that may require modifications to these guidelines du must be consulted at the designstage. In exceptional cases du may need to increase the requirements specified in this document tobe 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 theexclusive use of du.

Emirates Integrated Telecommunications Company PJSC (EITC)

Building infrastructure standards V4

July 2008

www.du.ae

Copy right Emirates Integrated Telecommunications Company PJSC (EITC)

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

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

- 2 - - 3 -Building infrastructure standards V4 www.du.ae Building infrastructure standards V4 www.du.ae

TELECOMMUNICATION SPACES

General specifications

A number of telecom rooms will be required in a building depending on the characteristics of thebuilding. The following room types are required and the details of these rooms are included in thetext 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 accountallowances for raised floors, overhead cable trays and any other obstructions. In the case thatoverhead 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 sharedcontainment 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 dupersonnel 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 tablethen this must be raised at the design stage. This situation will require a floor drain fitted with anautomatic 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 thisdocument 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 caseof pests it should be noted that rodents often gnaw cables resulting in damage and the potential ofservice disruption. Special attention should be given to preventing rodents entering telecom spaces

and pathways. This could involve the installation of covers to cable trays; if this is the case thesecovers must be removable to allow for the installation of additional cables.

The walls, floor, and ceiling of telecom rooms must be finished so as to minimize dust and staticelectricity. 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 tothese 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 buildingtelephone system.

Safety and other considerations

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

All telecom spaces should be fitted with smoke detectors connected to the buildingmanagement 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 retardantmaterial.

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

All doors to telecom rooms must be labelled. Details of the labeling scheme are given inAppendix 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 cylindertype extinguishers.

Temperature and humidity

All the telecom rooms, with the exception of the floor telecom closets, must be provided with an airconditioning system to main the temperature at 20C 3C and the relative humidity at 50% 10%.

To enable the building developer to design the air conditioning system the maximum heatdissipation 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 buildingdeveloper 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


MAIN TELECOM ROOM

A main telecom room must be provided on the ground floor for all multi-story buildings. This roomwill be used for the termination of telecom cables and to house telecom equipment both now and inthe future.

The minimum room dimensions will depend on the function and features of the building. Thespecifications are detailed in Table 1 below and drawings are provided in Appendix 4.

Single villas Complex of villas

15 to 50

Multi-Tenant

up to G+10or

up to 150 apartmentsor

up to 9,000m2

Multi-tenant

G+11 to G+100or

151 to 1000 apartmentsor

9,001 to 90,000m2

Shopping malls,warehouses, groups of

shops, retail outletsand bulk service

applications

No requirement 3 x 3 x 3m(WxDxH)

Located in a commonarea of the master plan

3 x 3 x 3m(WxDxH)

Located on the ground floorcommon area

4 x 3 x 3m(WxDxH)

Located on the ground floorcommon area

4 x 3 x 3m(WxDxH)

Located on the groundfloor common area

Table 1 - Main telecom room specifications

The door to the main telecom room must be outward opening with a minimum opening of 900mm x2100mm (WxH). The door should be labelled Main Telecom Room.

The main telecom room must be provided with a raised floor with a height of 300mm above the basefloor of the room. The detailed specification of the raised floor is provided in the next section.

In addition to the basic fire fighting provision detailed earlier, the main telecom room must beprovided with an additional automatic fire suppression system that uses inert atmospheric gases.The system must be linked to a fire suppression system panel outside of the room.

If the inside level of the room is not at the same height as the outside access then a suitable rampedentry with an anti-slip surface must me provided. A threshold step of 100mm must also be providedinside the room under the raised floor to prevent any ingress of water from outside the room.

All cables in the main telecom room must be properly routed to the desired destinations under theraised floor, for that an adequate sized cable tray system must be installed to maintain theconnectivity as described in appendix 4

MAIN TELECOM ROOM - raised flooring system:

The main telecom room should have a raised floor. This raised floor should provide a minimumdepth of 300mm above the base floor of the room. The floor should comply with the followingadditional specifications:

Tile dimensions

A standard size of 600mm x 600mm must be used. The thickness of bare tile, excluding top andbottom coverings, must be 35mm.

Tile surfaces

The top surface of the raised floor tiles must be a high pressure laminate anti-static type. Theunderside must have a conductive surface.

Tile core

Calcium Sulphate based tiles are preferred.To comply with UAE regulations the tile panel must have the following fire rating:

Fire retardant - 2 hours with a flame spread of 20 Heat resistant minimum of 60 minutes.

Load rating - uniform: The minimum uniform distributed load must be 7kN/m2

Load rating - concentrated

The minimum concentrated load is 18.6kN/m2. Tile deflection must not exceed 2mm.

Load rating - collapse or ultimate

The minimum collapse load must be 55kN/m2

Electrical performance

Surface and volume resistance (at 500V) 1x105 1x1010 ohm All metal parts of the raised floor system must be earth bonded

Pedestals

The pedestal specification must be as follows:

All pedestals in contact with the finished slab surface Fixed with glue and screws to the finished slab Allow a void below the raised floor of minimum depth 300mm Support a minimum off-center loading of 12kN Support a minimum centre loading of 30kN Have a height adjusting and locking nut system

Understructure system

A stringer system must be provided where the stringers are able to support a minimum loading onthe raised floor of 1kN.

Tile lifterA tile lifter must be provided in each area of the main telecom room.


Single villas Complex ofvillas

15 to 50

Multi-Tenant

up to G+10or

up to 150apartments

orup to 9,000m2

Multi-tenant

G+11 to G+100or

151 to 1000apartments

or9,001 to 90,000m2

Shoppingmalls

Groups of shops,retail outlets and

bulk servicesapplications

Warehouses

Norequirement*

Norequirement*

Residential:2 x 1 x 3m(WxDxH)

Commercial:2 x 2 x 3m(WxDxH)

Located in acommon area on

each floor

Residential:2 x 1 x

3m(WxDxH)

Commercial:2 x 2 x 3m(WxDxH)l

Located in acommon area on

each floor

3 x 3 x 3m(WxDxH)

Located in allserved floors

2 x 2 x 3m(WxDxH)

Located in a commonarea on each floor

Norequirement*

CLUSTERED BUILDINGS- group of towers

If a project consists of a cluster of multi-tenant buildings then all of the requirements of a singletower still apply. However, it may be possible to reduce the requirements for individual telecomrooms. This would require the cluster of buildings to be linked to the designated main telecom room.The details of this arrangement should be discussed with du at the design stage.

FLOOR TELECOM CLOSETS

A floor telecom closet must be provided on each floor of all multi-story buildings. The floor telecomcloset is required to provide a flexible point for the installation and maintenance of telecom cables.The specifications are detailed in Table 2 below and drawings provided in Appendix 4

Mobile-service rooms must be provided every 10 floors starting at the lowest basement level with asize 3m x 2m x 3m (WxDxH) with a secured access.

The mobile-service rooms must have a minimum distributed floor load rating of 10 KN/m2

The doors to these rooms must be outward opening with a minimum opening of 900mm x 2100mm(WxH). The doors should be labelled Mobile service room

ROOF-TOP MOBILE-SERVICE ROOM (up to G+10)

Roof-top mobile-service rooms must be provided on the roof of all multi-tenant buildings up to G+10and access must be provided to the building riser system. The specifications are detailed below inTable 4 and drawings are provided in Appendix 4.

Singlevillas

Complex ofvillas

15 to 50

Multi-Tenant

up to G+10or

up to 150apartments

orup to

9,000m2

Multi-tenant

G+11 toG+100

or151 to 1000apartments

or9,001 to

90,000m2

Shoppingmalls

Groups of shops, retailoutlets and bulk services

applications

Warehouses

Norequirement

Norequirement

3 x 3 x 3m(WxDxH)

On roof top

Norequirement

Defined atdesign stage



Table 4 - Roof-top mobile services room specifications

Table 2 - Floor telecom closet specifications

* Note: In the case of a multi-story home, office, warehouse, retail shop, etc, floor distribution boxes will be requiredwith a minimum size of 300 x 300 x 150 mm (WxHxD)

The temperature of the floor telecom closets must be maintained in range 20 30oC. In specialcases where the floor telecom closet may need to house non-standard equipment the roomspecification must be increased in line with those for a main telecom room. This must be discussedat the design stage.The closets must be provided with two outward opening doors with a minimum total opening of1500mm x 2100mm (WxH). The door should be labelled Floor Telecom Closet

MOBILE-SERVICE ROOMS (more than G+10)

Mobile-service rooms must be provided in all multi-tenant buildings above G+10. The specificationsare detailed in Table 3 below and drawings are provided in Appendix 4.

The door to this room should be outward opening with a minimum opening of 900mm x 2100mm(WxH); the doors should be labelled Roof Telecom Room.

The roof-top mobile room must have a minimum distributed floor load rating of 10 KN/m2

An opening must be provided with a dimension of 600mm x 400mm (WxH), 500mm below the roomceiling in walls facing the buildings roof-top area.

Space must be reserved on the roof-top of the building for the installation of mobile-serviceantennas. This will vary from building to building, but will typically be at the corners of the building oron any raised structure on the roof-top. The exact details will be defined at the design stage.

Singlevillas

Complex ofvillas

15 to 50

Multi-Tenant

up to G+10or

up to 150apartments

orup to 9,000m2

Multi-tenant

G+11 to G+100or

151 to 1000apartments

or9,001 to 90,000m2

Shoppingmalls

Groups of shops,retail outlets and bulkservices applications

Warehouses

Norequirement

Norequirement

Norequirement

3 x 2 x 3m(WxDxH)

Every 10 floorsstarting fromlowest basement




Table 3 Mobile-service room specifications


HOME CONSOLIDATION CABINETS - residential

The home consolidation cabinet is a space to house dus network termination equipment. It alsoserves as the distribution point for all of the local wiring. A consolidation cabinet should be providedin each home. This should be a telecom cabinet with the following minimum specifications:

Minimum internal dimensions 860mm x 600mm x 150 mm (HxWxD) Mounted flush with the wall Located in an accessible area inside the home close to the entrance and not inside a

kitchen, laundry room or bedroom Installed at a height of 1200mm (measured between the finished floor level and the bottom

edge of the cabinet) An adequate safe working space around the location Adequate ambient lighting Not close to sources of water or heat Not close to any electrical distribution or bus bars Adequate ventilation must be provided; minimum of one air change per hour. Fitted with RJ45 patch panel Lockable front door Vertical and horizontal cable management for (Unshielded Twisted Pair) UTP patch cables Sufficient cable entries to accommodate the incoming fibre optic and UTP cables Contain a dual 13A switched socket power outlet fed from a dedicated circuit breaker on the

domestic supply Labelled with villa or flat number

A drawing of a typical home consolidation cabinet is provided in Appendix 4.

OFFICE CONSOLIDATION CABINETS(Commercial predefined offices, warehouses, sheds, shops)

The office consolidation cabinet is a space to house dus network termination equipment. It alsoserves as the distribution point for all of the local wiring. A consolidation cabinet must be provided ineach business area. This should be a telecom cabinet with the following minimum specifications:

Minimum internal dimensions 860mm x 600mm x 300 mm (HxWxD) Located in an accessible area inside the office close to the entrance and not inside a pantry,

washroom, etc. Installed at a height of 1200mm (measured between the finished floor level and the bottom

edge of the cabinet) An adequate safe working space around the location Adequate ambient lighting Not close to sources of water or heat Not close to any electrical distribution or bus bars Adequate ventilation must be provided; minimum of one air change per hour Fitted with RJ45 patch panel Fitted with patch panel or termination block / frame Lockable front door Vertical and horizontal cable management for UTP patching cables Sufficient cable entries to accommodate the incoming fibre optic and UTP cables Contain a dual 13A switched socket power outlet fed from a dedicated circuit breaker on the

domestic supply Labelled with office/room number

A drawing of a typical business consolidation cabinet is provided in Appendix 4.

OFFICE CONSOLIDATION CABINETS (commercial shell and core)

In the case of a shell and core development one consolidation cabinet must be provided in eachfloor telecom closet. The cabinet specifications are as follows:

Dimensions 42U x 800mm x 800mm (HxWxD) Fitted with RJ45 patch panel Lockable side and rear panels and a lockable front door Provision for an air circulation of one change per hour Vertical and horizontal cable management for UTP patching cables Sufficient cable entries to accommodate the incoming fibre optic and UTP cables Fitted with minimum 8 way power distribution unit (PDU) Jacking feet Labelled with floor number

When a tenant moves into a shell and core building it is expected that they will install consolidationcabinets in each office or business area. The specifications of these consolidation cabinets are asdescribed in the previous section on office consolidation cabinets - commercial predefined rooms.However these specifications may need to be increased to the meet tenants actual requirements.The tenant may wish to provide their own telecom room space and extend the connectivity to thecabinet in the floor telecom closet. Where UTP cables do need to terminate in the floor telecomcloset this must be on a wall mounted patch panel or termination block at a common pointaccessible to du.

All installed cables must be properly routed inside the floor telecom closet to the desired destinationunder a raised floor or in overhead cable trays. Additionally, an adequately sized cable tray systemmust be installed to maintain connectivity between the cabinet and the wall mounted patch panelwhere the UTP cables are terminated (see recommendations in Appendix 5).

In these types of cases the building tenants will need to discus the requirements with du at the timeof fit-out.

ELECTRO-MECHANICAL EARTH BARS all rooms


All telecom rooms must be provided with electrical supplies. The details of the requirements for thevarious rooms are included in the text below and summarised in Appendix 1.

Diagrams of the telecom rooms showing the positions of the electrical systems and electrical singleline diagrams are included in Appendix 4.

ELECTRICAL SYSTEMS main telecom room

Sub-Main Distribution Board

The main telecom room should be provided with a Sub-Main Distribution Board (SMDB) with a 125Amain incomer from the buildings Essential Distribution Board (EDB).

The output side of the SMDB must have a minimum of 7 ways, fitted with Moulded Case CircuitBreakers (MCCB) as detailed below:

4 x 63A 1 x 40A 2 x Not fitted (Spare)

Distribution Sockets

Two 13A twin sockets must be installed in the main telecom room.

One twin 13A socket must also be provided located next to the entry door at a height of 2.2m abovefinished floor level.

These sockets must be supplied from the normal building utility supply on a spur with a dedicated20A circuit breaker.

ELECTRICAL SYSTEMS floor telecom closet

The following electrical systems must be provided in the floor telecom closet

Two 13A twin sockets, one on each side of the closet, fed from the normal building supplyon spurs with dedicated circuit breakers rated at 20 A.

ELECTRICAL SYSTEMS mobile-service room

The following electrical systems must be provided in the mobile-service telecom room:

63A 3 phase isolators fed from essential building power Two 13A twin sockets fed from the normal building supply on spurs with dedicated circuit

breakers rated at 20A.

ELECTRICAL SYSTEMS roof-top mobile-service room

The following electrical systems must be provided in the roof-top mobile-service room:

63A 3 phase isolators fed from essential building power Two 13A twin sockets fed from the normal building supply on spurs with dedicated circuit

breakers rated at 20A.

All telecom rooms, with the exception of floor telecom closets, must be fitted with two clean earthbars of the following specifications:

One earth bar for AC One earth bar for DC Minimum length of 500mm Minimum of 10 holes of 12mm diameter Each must be connected to its own earth pit with a resistance of less than 1 ohm Clearly labelled as AC and DC respectively


PATHWAYS

General Specifications

The following requirements must be applied to all containment systems:

The containment system must be designed so that installed cables do not exceed theminimum specified bend radius

All metal containment parts must be free from sharp edges and earth bonded Telecom riser openings must be sealed with a suitable fire retardant material Cable trays must be easily accessible in common areas to facilitate any future provision of

additional cables Any cable trays that are in publically accessible areas less than 4.8m above the floor must

be covered Containment systems must not run through areas exposed to excessive heat, moisture,

corrosive atmospheric or environmental conditions, high voltages, radio frequencyinterference (RFI) or electro-magnetic interference (EMI)

For all containment systems a minimum separation must be maintained from sources ofelectromagnetic interference. Further details are provided in Appendix 6.

The building developer may want to consider redundant containment systems, particularly incommercial or prestigious developments. du must be contacted at the design stage todiscuss any such requirements.

VERTICAL CONTAINMENT multi-story / multi-tenant buildings

Risers must be provided in multi-story multi-tenant buildings to allow the installation of telecomcables from the main telecom room to the floor telecom closets, mobile -services rooms and roof-topmobile-service rooms. Hot-Dip Galvanised (HDG) slotted steel cable trays must be provided in therisers to carry the telecom cables between all of the telecom rooms.

It is recommended that the main telecom room and floor telecom closets should be designed so thatthey are vertically aligned within the building.

Two cable trays, with the following minim