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This depends on the type of light source (incandescent, fluorescent, HID...etc) and the size of circuit breaker used. But for 400Watt, the rated current is obviously small (about 2 Amps) and you can use the smallest circuit breaker size and wire you have (typically 10A C.B. with 1.5 mm2 wire, 15A with 2.5mm2).

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14y ago
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9y ago

literally any size wire can literally be used for any voltage. What matters is how many amps will be drawn. It all has to do with heat. Voltage alone does not produce heat. Current (amps) however does produce heat. The more current being used, the more heat is being produced therefore the more current the larger the wire needs to be.

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10y ago

A #3 copper wire with an insulation factor of 75 and 90 degrees C is rated at 100 and 105 amps respectively.

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11y ago

A single conductor 500 MCM with an insulation rating of 90 degrees C is rated at 430 amps.

Parallel 3/0 with an insulation factor of 90 degrees C will be rated at 450 amps.

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9y ago

The gauge depends on how the maximum current supplied through the wire.

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8y ago

A 400 watt lamp on 120 volt circuit can use a #14 AWG conductor.

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Anonymous

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3y ago

2 awg

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Anonymous

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3y ago

1awg

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Q: What gauge wire is needed for 240 volts?
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