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What is the maximum load that can be connected in a circuit connecting only lighting points?
500 watts
750 watts
800 watts
1000 watts
800 watts
According to the Indian Electricity Rules and BIS (Bureau of Indian Standards) specifications for domestic electrical wiring, a lighting circuit is limited to a maximum of 800 watts or 10 points per sub-circuit. This restriction is implemented to prevent overheating of conductors and to ensure that a single circuit failure does not plunge a large area into darkness.
According to the Indian Electricity Rules and BIS (Bureau of Indian Standards) specifications for domestic electrical wiring, a lighting circuit is limited to a maximum of 800 watts or 10 points per sub-circuit. This restriction is implemented to prevent overheating of conductors and to ensure that a single circuit failure does not plunge a large area into darkness.
PmaxтАЛ=800┬аW тАФ Maximum power rating for a single lighting sub-circuit
NpointsтАЛтЙд10 тАФ Maximum number of points per lighting sub-circuit
The principle relies on the thermal capacity of the cables typically used in final sub-circuits (usually 1.5┬аmm2 copper wire). By limiting the load to 800 W, the current drawn is kept well within the safety rating of the cables and protective devices, minimizing voltage drop and preventing insulation degradation due to excessive heat generation (I2R losses).
BIS recommends a maximum of 800 watts for lighting circuits.
A maximum of 10 points are permitted per sub-circuit.
Power circuits are separate and usually limited to 3000 watts with a maximum of 2 points.
Lighting circuits typically use 1.5┬аmm2 copper conductors.
Improved safety by preventing cable overload
Easier fault location and maintenance
Minimized voltage drop across the circuit
Higher initial cost due to increased number of sub-circuits
Requires more space in the distribution board
Domestic lighting installations
Commercial office lighting wiring
Industrial lighting sub-circuits
Standard BIS specification: IS 732 (Code of Practice for Electrical Wiring Installations).
The 800W rule is mandatory for small domestic installations to ensure protection against fire hazards.
Option A (500 W) is lower than the standard limit.
Option B (750 W) and Option D (1000 W) are incorrect as they deviate from the established code limit of 800 W.
C is correct тАФ The maximum load permitted for a lighting sub-circuit in Indian electrical installation standards is 800 watts.
Always distinguish between 'Lighting Circuits' (800 W limit) and 'Power Circuits' (3000 W limit) in exam questions, as examiners often swap these values to confuse candidates.