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).
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.
A #3 copper wire with an insulation factor of 75 and 90 degrees C is rated at 100 and 105 amps respectively.
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.
The gauge depends on how the maximum current supplied through the wire.
A 400 watt lamp on 120 volt circuit can use a #14 AWG conductor.
2 awg
1awg
5 amps
At 120 Volts you would draw about 42 amps. At 240 Volts it would be about 21 amps. For 120 Volts you would need 6 AWG and for 240 Volts you would need 10 AWG.
14 AWG is fine for this application.
240 v is dangerous and any rewiring should be done by an electrician who knows the regulations that are there to prevent electric shocks and fatalities..
Typically yes if you use a 30 amp breaker and the dryer uses 230-240 volts.
At the service entrance you will need AWG 1/0 gauge.
30 amps.
5 amps
A #14 wire will do the job.
10 gauge
At 120 Volts you would draw about 42 amps. At 240 Volts it would be about 21 amps. For 120 Volts you would need 6 AWG and for 240 Volts you would need 10 AWG.
Depends on the amperage of the Jacuzzi and if it is 120 or 240 volts.
AWG # 10.
10 AWG copper.
Wire sizes are governed by the amperage the wire is to carry. To answer this question the load current is required.
10 mm2 cross section should be sufficient (#6 wire?)
you will need wiring that is at least 10 amp rated wire or higher. If you really needed to ask you might want to call an electrician Electrician here, be the pump 120 volts or 240 volts a #14 wire will handle the situation. Longer runs of 75 feet you should go to a #12 wire to compensate for voltage drop. The pump should be on its own separate circuit with a 15 amp breaker. A two pole 15 amp breaker if the pump is 240 volts.