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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 (IE) Rules and the National Electrical Code of India, a light and fan circuit is restricted in its capacity to ensure safety and prevent overloading. A single sub-circuit intended for lighting and fan points is limited to a maximum connected load of 800 Watts or a maximum of 10 points, whichever is lower.
According to the Indian Electricity (IE) Rules and the National Electrical Code of India, a light and fan circuit is restricted in its capacity to ensure safety and prevent overloading. A single sub-circuit intended for lighting and fan points is limited to a maximum connected load of 800 Watts or a maximum of 10 points, whichever is lower.
P=VтЛЕIтЛЕcos╧Х тАФ Power relation for AC lighting circuit
IratedтАЛтЙеVPmaxтАЛтАЛ тАФ Current carrying capacity requirement for the circuit protection
The principle relies on the protection coordination of the miniature circuit breaker (MCB) or fuse protecting the sub-circuit. By limiting the load to 800 Watts, the steady-state current I=VтЛЕcos╧ХPтАЛ is kept within the rated capacity of the standard 1.5mm2 copper wiring used for lighting circuits, preventing insulation degradation due to overheating.
IE Rules mandate that lighting sub-circuits shall not exceed 800 Watts.
A maximum of 10 points (switch points) is allowed per lighting sub-circuit.
If the number of points exceeds 10, a new sub-circuit must be created even if the total wattage is below 800W.
The standard supply voltage for these circuits in India is 230V AC.
Prevents thermal stress on branch circuit wiring.
Ensures isolation of faults; a fault in one circuit does not disable the entire building's lighting.
Increases the number of MCBs required in the Distribution Board (DB).
Requires more conduit routing for separate circuit cables.
Residential wiring (internal lighting and ceiling fans).
Commercial building light fixtures.
Office internal illumination circuits.
Power circuits are treated differently: the maximum load for a power sub-circuit is typically 3000 Watts with a maximum of 2 points.
Option A (500W) is incorrect as it is lower than the standard ceiling.
Option D (1000W) is incorrect as it exceeds the safety limit specified by regulatory standards.
C is correct тАФ The maximum permissible connected load for a lighting sub-circuit is 800 Watts.
Always remember the '800W or 10 points' rule for lighting, and '3000W or 2 points' for power circuitsтАФthese are frequent questions in SSC JE and State AE exams.