My heat pump was professionally wired when built in 2004. Wire is No. 4 AWG with
80 amp breaker
10 guage.
30 amp breaker with #10 gauge copper wire
Use AWG # 6 wire.
You need a 60 amp breaker.
20 amp breaker 12 gauge wire assuming its 120 volt
6ga should be used. It might not be against codes where you are,and you might have a 50amp installed for something that only uses 40amp, but it should be done right, and 6ga should be used off of a 50amp breaker.
14 gauge will handle it with a 15 amp breaker. If you use 12 gauge use a 20 amp breaker.
Minimum size is 10 gauge with a 30 amp breaker. To be safe I would install an 8 gauge with a 40 amp breaker.
No. A 20 amp breaker needs 12 gauge wire.
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In general, you should never use a breaker larger than 20 Amps on a #12 AWG (American Wire Gauge) copper wire.
It should take a two pole (220V) 50 amp breaker and matching plug wired with # 8 or # 6 gauge wire. Check your manual.