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Electronics => Beginners => Topic started by: Crambone on June 24, 2023, 12:43:58 am

Title: Circuit breaker question
Post by: Crambone on June 24, 2023, 12:43:58 am

If I have a 240 vac 40 amp load can I protect it with a single pole 40 amp breaker on one leg of the 240 vac?

Title: Re: Circuit breaker question
Post by: Monkeh on June 24, 2023, 12:49:50 am

Ponder the outcome of a ground fault on the unfused leg. And then hire an electrician..

Title: Re: Circuit breaker question
Post by: helius on June 24, 2023, 01:54:45 am

If using the common 120-0-120 North American split-phase power, you must use ganged two-pole circuit breakers on 240V circuits.

Title: Re: Circuit breaker question
Post by: WattsThat on June 24, 2023, 04:56:55 am

No. You need a two pole ganged breaker as mentioned and #8 awg wire. If you use 8/2 with ground, mark the white lead with black tape on both ends.

Ovens/Ranges/Dryers now require a GFCI breaker.

Title: Re: Circuit breaker question
Post by: JustMeHere on June 24, 2023, 05:25:28 am

You have to have two adjacent slots free to get 240 out of an American panel.