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aerial amplifier amps appliance arc tube battery bi-metal bldg block breaking capacity building busbars ceiling chapter characteristic impedance circuit breaker coil conductor connected contactor cooker copper Courtesy Covered yard 15 distribution board double insulation earth electrode earth terminal Electricity Board engineer equipment extra low voltage factory fault current final sub-circuits fire alarm fittings fixed flats flexible conduit floor fluorescent fluorescent lamp frequency I.E.E. Regulations illustrated in Fig impedance inside installation insulated cables lamp lampholder length lift load low voltage luminaires machine main intake manufacturers maximum mercury metal metalwork meter motor necessary needed normal operated output overload plug possible PVC sheathed cable relay resistance ring ring circuit screw served short circuit shown in Fig socket outlets speed steel Stores 15 sub-main suitable supply surface switch fuse temperature three phase transformer trunking tube tungsten unit voltage drop wall