Introduction section1: general requirements
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- APPENDIX 10
- Notes
- APPENDIX 11
- TRUNKING
- CONDUIT
- CABLE TRAY
- APPENDIX 13
- APPENDIX 14
Note: - Refer section.5 of Regulations. APPENDIX 10EARTH LEAKAGE PROTECTION Recommended value of operating current of ELCB/RCCB in Consumer installations:-
Notes: -Grouping of circuits under one ELCB/RCCB is permitted for lighting circuits, general purpose switched socket outlets, single phase equipment/appliance, etc. In such cases maximum number of circuits proposed under each group shall be suitably selected considering the type of project such as Residential, Commercial, Industrial, etc. and the possible interruptions. Wherever un-interrupted power supply is required for equipment/circuits of fire protection, drainage(such as ,Fire pump, Jockey pump, sump pump, springer pump,, pressurisation pump, smoke extract fan etc… )Suitable earth leakage detection system with indication and/or alarm is permitted. For industrial installation which are designed with co-ordinated operational system of plants and machines, the earth leakage protection shall be suitably selected considering the safety and operational requirements. Refer section 5 of Regulations. APPENDIX 11SPACING OF SUPPORTS FOR TRUNKING, CONDUITS AND CABLES Recommended maximum spacing of Clips, Cleats, Saddles or supports (Refer section 6 for Regulations). TRUNKING:
CONDUITS:
ARMOURED CABLES:
APPENDIX 12 NUMBER OF CABLES THAT MAY BE INSTALLED IN TRUNKING, CONDUITS AND TRAYS (Refer Section 6 of Regulations) TRUNKING :Where single core insulated cables are installed in surface mounted metal or PVC trunking, the space factor shall normally not exceed 40 percent. Suitable correction factor shall be applied to the corresponding current carrying capacity, based on the number of circuits installed within the trunking. CONDUIT:
The size of conduits selected shall allow drawing the cables freely within, without damaging the insulation. CABLE TRAY:Where single core insulated & sheathed cables are installed in ventilated cable trays, the sum of the combined cross - sectional area of all cables installed in the tray shall not exceed 50% of the interior cross sectional area of the cable tray. Suitable correction factor shall be applied to the corresponding current carrying capacity based on number of circuits and method of installation (touching or spaced). Where multicore cables are installed in ventilated cable trays the sum of the dia-metres of all cables installed shall not exceed 60% of the cable tray width and the cables shall be installed in a single layer. Suitable corrector factor shall be applied to the corresponding current carrying capacity based on the number of cables and the method of installation (touching & spaced). APPENDIX 13GENERAL CONDITIONS/REQUIREMENTS FOR PROVISION OF ATTIC SLAB ABOVE SUBSTATION AND LV ELECTRICAL ROOM. In principle there shall not be any wet facilities above the substation/Ring Main Unit Room/LV electrical room. Only in exceptional unavoidable cases this may be allowed at the discretion of the Authority and the following requirements must be fulfilled: A Reinforced Concrete Attic slab above the entire substation/Ring Main Unit Room/LV electrical room shall be provided. The entire attic slab and floor slab above including the vertical sides above attic slab shall be waterproofed by an approved system. The consultant shall be fully responsible for supervision of the waterproofing works, during execution and testing of waterproofing. All pipes, joints, trap, etc. running in wet areas shall be wrapped with approved Waterproofing membrane. The void between floor and attic slab shall be minimum 60cms clear height. Access to the void above attic slab shall be 120cm x 60cm fitted with aluminum louvered door. The void shall not be used for any other purpose and shall have permanent lighting arrangement. Drain pipe to be provided for the attic slab to drain out any water leakage through floor slab. Tiles are not compulsory above attic slab. The consultant shall forward complete floor plans showing location of Wet Area and substation/Ring Main Unit Room/LV electrical room. Extent of attic slab shall be clearly marked in the plans. Typical cross sections through the Wet Area/ substation/Ring Main Unit Room/LV electrical room and Attic Slab shall be shown in the drawings including waterproofing arrangement/systems/materials. Refer checklist below for attic slab construction:
APPENDIX 14GENERAL DIMENSIONAL DETAILS WITHIN BUILDINGS APPENDIX 15 GENERAL ARRANGEMENTS AND DETAILS OF SUBSTATION EQUIPMENT WITHIN BUILDINGS APPENDIX 16 DETAILS OF SUBSTATION DOORS APPENDIX 17 DETAILS OF SUBSTATION DOORS APPENDIX 18 FORCE VENTILATION FOR TRANSFORMER ROOM AT BASEMENT APPENDIX 19 CABLE LAYING ARRANGEMENT IN CONCRETE TRENCH (SECTION T-T) . @--. •Æ0—— wø dewa.gov.ae Download 2.29 Mb. Share with your friends:
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