Electrical Abstract-National Building Code (NBC)

ELECTRICAL ABSTRACT- NBC- (PART-2)

LUMINOUS EFFICACY, LUMEN MAINTENANCE AND COLOR RENDITION (TABLE-8) NBC

Light Source Wattage Efficacy (lm/W ) Average Life Maintenance Color Rendition Incandescent lamps 15 to 200 12 to 20 500 to 1000 Fair to good Very good Tungsten halogen 300 to 1500 20 to 27 200 to 2000 Good to very good Very good Standard fluorescent lamps 20 to 80 55 to 65 5000 Fair to good Good Compact fluorescent lamps (CFL) 5 to 40 60 to 70 7500 Good Good to very good Slim line fluorescent 18 to 58 57 to 67 5000 Fair to good Good High pressure mercury vapor lamps 60 to 1000 50 to 65 5000 Very low to fair Federate Blended – light lamps 160 to 250 20 to 30 5000 Low to fair Federate High pressure sodium vapor lamps 50 to 1000 90 to 125 10000 to 15000 Fair to good Low to good Metal halide lamps 35 to 2000 80 to 95 4000 to 10000 Very low Very good Low pressure sodium 10 to 180 100 to 200 10000 to 20000 Good to very good Poor LED 0.5 to 2.0 60 to 100 10000 Very good Good for white LED

APPROXIMATE CABLE CURRENT CAPACITY

Cable Size Current Capacity MCB Size 1.5 Sq.mm 7.5 To 16 A 8A 2.5 Sq.mm 16 To 22 A 15A 4 Sq.mm 22 To 30 A 20A 6 Sq.mm 39 To 39 A 30A 10 Sq.mm 39 To 54A 40A 16 Sq.mm 54 To 72A 60A 25 Sq.mm 72 To 93A 80A 50 Sq.mm 117 To 147A 125A 70 Sq.mm 147 To 180A 150A 95 Sq.mm 180 To 216A 200A 120 Sq.mm 216 To 250A 225A 150 Sq.mm 250 To 287A 275A 185 Sq.mm 287 To 334A 300A 240 Sq.mm 334 To 400A 350A

REQUIREMENTS FOR PHYSICAL PROTECTION OF UNDERGROUND CABLES (AS PER NBC)

Protective Element Specifications Bricks (a) 100 mm minimum width (b) 25 mm thick (c) sand cushioning 100 mm and sand cover 100 mm Concrete slabs At least 50 mm thick Plastic slabs (polymeric cover strips) Fiber reinforced plastic depending on properties and has to be matched with the protective cushioning and cover PVC conduit or PVC pipe or stoneware pipe or Hume pipe The pipe diameter should be such so that the cable is able to easily slip down the pipe Galvanized pipe The pipe diameter should be such so that the cable is able to easily slip down the pipe The Trench : The trench shall be back filled to cover the cable initially by 200 mm of sand fill; and then a plastic marker strip hall be put over the full length of cable in the trench. The Marker Signs: The marker signs shall be provided where any cable enters or leaves a building. This will identify that there is a cable located underground near the building. The trench shall then be completely filled. If the cables rise above ground to enter a building or other structure, a mechanical protection such as a GI pipe or PVC pipe for the cable from the trench depth to a height of 2.0 m above ground shall be provided.

AREA REQUIRED FOR GENERATOR IN ELECTRIC SUBSTATION (AS PER NBC)

Capacity kVA Area m2 Clear Height below the Soffit of the Beam m 25 56 3.6 48 56 3.6 100 65 3.6 150 72 3.6 248 100 4.2 350 100 4.2 480 100 4.2 600 110 4.6 800 120 4.6 1010 120 6.5 1250 120 6.5 1600 150 6.5 2000 150 6.5

LOW VOLTAGE CABLING FOR BUILDING (AS PER NBC)

Low Voltage Cable Cables/wires, such as fiber optic cable, co-axial cable, etc. These shall be laid at least at a distance of 300 mm from any power wire or cable. The distance may be reduced only by using completely closed earthed metal trucking with metal separations for various kind of cable. Special care shall be taken to ensure that the conduit runs and wiring are laid properly for low voltage signal to flow through it. The power cable and the signal or data cable may run together under floor and near the equipment. However, separation may be required from the insulation aspect, if the signal cable is running close to an un-insulated conductor carrying power at high voltage. All types of signal cables are required to have insulation level for withstanding 2 kV impulse voltages even if they are meant for service at low voltage. Conduit Color Scheme Power conduit=Black Security conduit=Blue Fire alarm conduit=Red Low voltage conduit=Brown UPS conduit Green

SUB STATION GUIDELINE (AS PER NBC)

Substation Location Location of substation in the basement should be avoided, as far as possible. If there is only one basement in a building, the substation/switch room shall not be provided in the basement and the floor level of the substation shall not be lowest point of the basement. Substation shall not be located immediately above or below plumbing water tanks or sewage treatment plant (STP) water tanks at the same location Substation Door/Shutter All door openings from substation, electrical rooms, etc, should open outwards Vertical shutters (like rolling shutters) may also be acceptable provided they are combined with a single leaf door opening outwards for exit in case of emergency For large substation room/electrical room having multiple equipment, two or more doors shall be provided which shall be remotely located from each other No services…