October 2013
Intermediate to advanced
192 pages
8h 30m
English
Content preview from Electric Wiring, 3rd Edition
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2 Ratings, cable sizes and circuit protection
All current-consuming electrical apparatus is given a rating which indicates
the amount of power it will consume. This rating is in watts or kilowatts
(kW),
where
1
kW= 1000
watts.
Some typical loadings of domestic apparatus
are given below:
Appliance
Loading in
watts
Lamps (filament) 15, 25, 40, 60, 75, 100, 150
Lamps (fluorescent) 15, 20, 30, 40, 50, 65, 75, 85
Fires and heaters 500-3400
Water-heaters, immersion heaters 750-3,000
Wash boilers 3,000
Washing machines 3,000
Spin-driers 300-500
Drying cabinets 2,000-3,000
Refrigerators 300-400
Cookers 6,000-8,000
Portable appliances (e.g. irons,
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