80% of the rated circuit. 10 amp circuit is 8 amps, 20 amp circuit is 16 amps, etc.
If the overcurrent protection device is 40 Amps, then a 30-Amp plug can overheat and catch fire at 40 Amps before the circuit-breaker blows.
If you have 100 amp wire, you can use it for a 60 amp circuit, or for any circuit of 100 amps or less. But if you have a 60 amp circuit, 60 amp wire is thinner and cheaper than 100 amp wire.
Provided you use wire that is rated for 20 amps.
1 amp
80% of the rated circuit. 10 amp circuit is 8 amps, 20 amp circuit is 16 amps, etc.
If the overcurrent protection device is 40 Amps, then a 30-Amp plug can overheat and catch fire at 40 Amps before the circuit-breaker blows.
If you have 100 amp wire, you can use it for a 60 amp circuit, or for any circuit of 100 amps or less. But if you have a 60 amp circuit, 60 amp wire is thinner and cheaper than 100 amp wire.
No. 20 amps at 120 volts will handle a maximum of 2400 watts. And you should never continuously load a 20 amp 120 volt circuit to no more than 1920 watts.
A 15 amp circuit breaker should trip at 15 amps regardless of the load voltages or impedances. If you have 277 volts and 7 ohms, the current would be 39.5 amps and a 15 amp circuit breaker should trip.
Provided you use wire that is rated for 20 amps.
1 amp
Depends on how many amps it pulls and the size of the wire in the circuit.
About 8 amps worth, if you derate the circuit for 100 percent duty cycle.
No, a double pole 50 amp breaker protects a 240 volt supply at 50 amps. The number that is on the handle of the breaker is the amperage that the breaker will trip at if an overload occurs on the circuit.
A 30 amp circuit on a 250 volt service could handle up to 7500 watts. That's if it's actually 250 volts coming in. You should check that with your meter.
A 20 amp circuit be used for any device that takes up to 20 amps to make it operate.