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220volt20amp outlet trips 40amp double breaker Proper size wire to use?

Jonathan Fradkin
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    What make and model is the air conditioner in question? – ThreePhaseEel Jun 06 '21 at 23:28
  • Is the breaker a "plain" breaker or does it have a TEST button (AFCI and/or GFCI)? – manassehkatz-Moving 2 Codidact Jun 07 '21 at 01:06
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    A 20A outlet does not belong on a 40A breaker, for one thing... – Ecnerwal Jun 07 '21 at 02:45
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    The wire size (whatever it may currently be) is almost certainly not what's causing the breaker to trip. – brhans Jun 07 '21 at 03:13
  • There is some misinformation on this site so be careful. What is the make and model of the outside unit? What is the max breaker size if listed on the outside unit nameplate. A 40 amp breaker is large for a 20 amp unit but code allows larger breakers to be used, 20 amp fla usually tops out at 35 as max breaker on 12 awg wire but it is possible. If the unit was cooling properly it may be a starting capacitor, how old is the unit. We need to know more to help. – Ed Beal Jun 08 '21 at 23:24

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