260526 GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS1. Generally 1.01 Earthing system is given as an item. 1.02 Rates of earthing system are deemed to include the costs of: a complete system as specified and shown on the drawings including trenches excavation, backfilling, reinstatement, etc... (excluding protective earthing conductors that run with branch circuit wiring and protective earthing cables run with main and sub-feeders which are measured separately), earthing loops conductors, conduits for earthing conductors, lattices, pits, electrodes, connectors, clamps, earthing conductors from earthing loops, earth lattices and building steel rebars to building earth bars, exothermic welding to these earthing loops and rebars, earthing conductors from bars to transformers, generators, switchboards (MV & LV), outdoor ring main units, outdoor packaged substations and equipment, equipotential earthing of mechanical plant rooms and equipment, earthing of telecommunications rooms and equipment (including Signal Reference Potential Plane (SRPP)) and electrical identification as required by specifications, bonding and connection between earthing networks, at various levels of rock cut line, where applicable, bonding to all metallic equipments and to building reinforcement & steel structure as per specification, calculating / measuring earth fault loop impedance and checking its compliance with specifications. 260533 RACEWAYS AND BOXES FOR ELECTRICAL SYSTEMS 1. Generally 1.01 Each kind of raceway is given separately (except where required to be included with other items), stating the type, size and method of installation. 1.02 Raceways are given in linear meters, measured the net length. 1.03 Floor boxes are given separately and are enumerated, indicating type, dimensions and service outlets.
260526 GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS<br>1. Generally <br>1.01 Earthing system is given as an item. <br>1.02 Rates of earthing system are deemed to include the costs of: <br>a complete system as specified and shown on the drawings including trenches <br>excavation, backfilling, reinstatement, etc... (excluding protective earthing <br>conductors that run with branch circuit wiring and protective earthing cables run <br>with main and sub-feeders which are measured separately), <br>earthing loops conductors, conduits for earthing conductors, lattices, pits, <br>electrodes, connectors, clamps, earthing conductors from earthing loops, earth <br>lattices and building steel rebars to building earth bars, exothermic welding to <br>these earthing loops and rebars, earthing conductors from bars to transformers, <br>generators, switchboards (MV & LV), outdoor ring main units, outdoor packaged <br>substations and equipment, equipotential earthing of mechanical plant rooms and <br>equipment, earthing of telecommunications rooms and equipment (including <br>Signal Reference Potential Plane (SRPP)) and electrical identification as required <br>by specifications, <br>bonding and connection between earthing networks, at various levels of rock cut <br>line, where applicable, <br>bonding to all metallic equipments and to building reinforcement & steel structure <br>as per specification, <br>calculating / measuring earth fault loop impedance and checking its compliance <br>with specifications. <br>260533 RACEWAYS AND BOXES FOR ELECTRICAL SYSTEMS <br>1. Generally <br>1.01 Each kind of raceway is given separately (except where required to be included with <br>other items), stating the type, size and method of installation. <br>1.02 Raceways are given in linear meters, measured the net length. <br>1.03 Floor boxes are given separately and are enumerated, indicating type, dimensions and <br>service outlets.
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