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240V 20 amp circuit breaker
I'm installing 240 volt in-floor heating mats. The amperage draw is 21 amps. I intended to connect them to a 2-pole, 240 volt, 20 amp breaker. My thought was that you have two legs of 20 amp power (40 amps total). Is this correct of how the 240 volt breakers work?
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NO. You do not add up the amperages. A two-pole 20A breaker is 20A @ 240v, or 4,800 potential watts A single-pole 20A breaker is 20A @ 120v, or 2,400 potential watts. Since electric heat has to be figured at 125% you need a two-pole 30A breaker wired with #10cu wire. You only need two hots and a ground. You do not need a neutral for this 240v circuit. 10/2NM cable would be typical. |
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