Internal Electrical Work Abstract of CPWD
INTERNAL ELECTRICAL WORK -ABSTRACT OF CPWD
Circuits:
Topic Abstracts Lighting Circuit Per Circuit Not more than 10 Points of Lighting or Total 800Watt which is less Power Circuit For Residential Per Circuit Less than 2 No of 5A/15A Plug Socket Power Circuit For Non Residential Per Circuit Less than 1 No of 5A/15A Plug Socket Plug Socket In Residential wiring ,wiring of Socket outlet shall be done by copper Cable only Min Size of Wire For Lighting Circuit Smallest size of conductor shall be 1.5 Sq.mm Min Size of Wire For Power Circuit Smallest size of conductor shall be 4 Sq.mm
Plug Socket
Plug Socket 5A/6A or 15A/16A Socket shall be installed at following heights: =For Non Residential building 23cm above floor
=For Kitchen 23cm above Platform.
=For Bathroom not Socket is provided in bathroom MCB/IC will be 2.1 mt from fixed appliance and at least 1 mt away from Shower
Switch Board / D.B
Operating Rod Operating Rod/Handle of Distribution Board at the height of min 2mt D.B Clearance Clear Distance in front of Switch Board/D.B shall be min 1 mt. D.B Clearance If there may be bare connection at back of Switch Board than space behind S/W shall be either less than 20cm or more than 75cm D.B Clearance No fuse Body shall be mounted within 2.5 com edge of D.B or Panel D.B Clearance Clearance between 2.5 cm is maintained between opposite polarity Switch Box Switch Box or Regular Box shall be mounted normally 1.25 mt from floor level.
Fan Hook
Fan Hook For Fan Hook in concrete roof 12mm dia MS Rod in ‘U’ Shape, horizontally Leg at Top at least 19 cm on either side.
Connection between adjustment Building (Out House, Garages)
Safety Clearance If the distance with adjustment building is less than 3 mt and there is no any Road interval than GI pipe of suitable size shall be installed. This pipe shall be exposed on wall at height of not less than 2.5 mt. Safety Clearance If the distance with adjustment building is more than 3 mt and there is any Road interval than GI pipe of suitable size shall be installed. This pipe shall be exposed on wall at height of not less than 4 mt.
Conduit
Metallic Conduit Shall be used for Industrial wiring, Heavy mechanical Stress, shall be ISI marked, The Thickness shall not be less than 1.6mm(16SWG) for conduits up to 32mm Dia and not less than 2mm (14SWG) for conduit above 32mm Dia. Metallic Conduit No steel conduit less than 20 mm Diameter shall be used. Metallic Conduit For rigid Conduit IS:2509/IS:3419 and For Flexible Conduit IS:6946. Metallic Accessories All Metallic conduit accessories shall be threaded type (Not pin grip, clamp grip) Metallic Accessories Saddle for surface conduit work on wall shall not less than 0.55mm(24 gauge) for conduit up to 25mm Dia not less than 0.9mm (20 gauge) for larger Dia Metallic Outlets Fore Cast Boxes:
Wall thickness shall be at least 3mm.
For Welded mild Steel Box:
Wall thickness shall not be less than 1.2mm (18 gauge) for Boxes up to size 20cmX30cm. Above This size 1.6mm(16guage)thick MS Boxes shall be used.
Metallic Outlets Clear depth of Out less Box shall not be less than 60mm.
This will be increased as per mounting of Fan regulator
Bends in Conduits Bending radius not less than 7.5 cm Fixating Conduits on Surface Conduits shall be fixed by saddles not less than 1mt interval but in case of coupler/Bends in either side of saddles, The saddle shall be fitted 30 cm from fitting. Non Metallic Accessories Normally grip Type. Non Metallic Outlet(PVC Box) PVC Box IS:5133(PartII) thickness not less than 2mm,Clear depth of PVC Boxes not less than 60mm. Non Metallic Surface Conduit Conduits shall be fixed by saddles not less than 60cm interval but in case of coupler/Bends in either side of saddles, The saddle shall be fitted 15 cm from fitting.
Junction Box
Junction Box Depth of Junction Box shall be min 65mm as per IS: 2667.
Fish Wire
Fish Wire GI fish wire of 1.6mm/1.2mm (16SWG) shall be used.
Bus bar
Bus bar Busbar shall be 100A,200A,300A,400A,500A,600A,800A Bus bar The Cross-section area of Bus bar shall be same as Phase Bus bar (Up to 200A) for higher Capacity Neutral Bus bar must be not less than half cross section areas of Phase Bus bar. Bus bar Bus bar shall be suitably installed with PVC sleeve/Tap. Bus bar Bus bar Chamber shall be fabricated with MS angle for Frame work and sheet steel of thickness not less than 1.5mm. Bus bar Minimum clearance between phase to earth shall be 26mm and phase to phase shall be 32mm.
Bus bar Trucking
Bus bar Trucking Bus bar Trucking are generally used for interconnection between T/C over 500KVA/D.G set over 500KVA and their switch Board Panel. Bus bar Trucking Bus bar Trucking enclosure sheet steel of min 2mm thickness
Earthing
Earthing Type of earthling are Pipe earthling/Plate earthling/Strip earthling. Earthing Length of Buried strip shall not be less than 15mt. Earthing Two copper …