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What is the maximum number of lighting points that can be connected in a circuit?
5
10
8
12
10
According to the Indian Electricity (IE) Rules and Bureau of Indian Standards (BIS) code IS 732, the maximum number of lighting points allowed in a single sub-circuit is limited to 10. Additionally, the total connected load in a lighting sub-circuit must not exceed 800 Watts.
According to the Indian Electricity (IE) Rules and Bureau of Indian Standards (BIS) code IS 732, the maximum number of lighting points allowed in a single sub-circuit is limited to 10. Additionally, the total connected load in a lighting sub-circuit must not exceed 800 Watts.
PtotalтАЛ=тИСi=1nтАЛPiтАЛтЙд800┬аW тАФ Condition for total connected load per circuit
NpointsтАЛтЙд10 тАФ Maximum allowable lighting points per circuit
The restriction is primarily established to prevent circuit overloading and ensure safety by limiting the current flowing through branch circuits. By capping the number of points and the total wattage (800W), the electrical installation remains within the safe current-carrying capacity of the standard wiring (typically 1.5 sq. mm copper conductors) and ensures that protection devices like MCBs can operate effectively during a fault.
Regulation follows IS 732:1989 standards.
Lighting sub-circuits are restricted to 800W or 10 points, whichever is reached first.
Power sub-circuits are limited to a maximum of 2 points with a total load of up to 3000W.
Standard protection devices (MCB) for lighting circuits are usually rated at 6A or 10A.
Prevents thermal damage to wiring insulation due to overheating.
Ensures effective protection by circuit breakers (MCBs) during faults.
Requires more sub-circuits for large buildings, increasing switchgear costs.
Limitations may constrain the design of complex lighting layouts in large halls.
Residential wiring design.
Office building electrical planning.
Public lighting installations.
The 10-point limit includes fans, light sockets, and exhaust fans in a standard lighting circuit.
Exceeding these limits leads to potential voltage drops and fire hazards due to current density limits in conductors.
B is correct тАФ As per IS standards for domestic electrical wiring, a lighting sub-circuit is restricted to a maximum of 10 points or 800 Watts of load.
Remember that while lighting circuits are limited to 10 points/800W, power circuits are strictly limited to 2 points/3000W for appliances like ACs or geysers.