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Normally older ovens required a AWG #8 wire on a 40 amp breaker. On a modern double oven I would recommend you install AWG #6 on a 50 amp breaker. That way you are safe and will not have to worry about the breaker tripping. It will cost a little more but is worth it in the long run.
40 amp
A #14 wire will do fine for grounding a 20 amp device. That is the size of the ground wire in a 2 conductor # 12 wire building cable.
Yes, they are the same size wire.
You use the correct size breaker depending on the size wire in the circuit. If the circuit is wired with AWG #12 wire use a 20 amp breaker. If it is wired with AWG #14 wire then use a 15 amp breaker.
50 amp breaker wired with AWG # 6 wire.
A 30 amp breaker run 75 feet would require you use AWG #10 wire. But, an oven normally pulls more that 30 amps and I would not use #10 wire on a 30 amp breaker for an oven. Normally any newer oven is wired with AWG #6 gauge wire on a 50 amp circuit breaker so the breaker will not trip during heavy use of the oven. Some older ovens could use a #8 wire on a 40 amp breaker.
Normally older ovens required a AWG #8 wire on a 40 amp breaker. On a modern double oven I would recommend you install AWG #6 on a 50 amp breaker. That way you are safe and will not have to worry about the breaker tripping. It will cost a little more but is worth it in the long run.
40 amp
50 amps
No .
A #14 wire will do fine for grounding a 20 amp device. That is the size of the ground wire in a 2 conductor # 12 wire building cable.
10/3 wire with 30 amp double pole breaker from panel box to water heater.
Yes, they are the same size wire.
15 amps.
on a 4000 watt amp the best gauge wire woul be between 2 and 0
You use the correct size breaker depending on the size wire in the circuit. If the circuit is wired with AWG #12 wire use a 20 amp breaker. If it is wired with AWG #14 wire then use a 15 amp breaker.