Understanding Air Conditioning Circuit Requirements
Electrical Troubleshooting tips for an Air Conditioner: I need a 2 pole 20 amp breaker for my panel box, It is for the wire to my air conditioning unit. The specs are rated voltage…
The Air Conditioner Specifications Tell It All
Electrical Question: I need a 2 pole 20 amp breaker for my panel box. It is for the wire to my air conditioning unit. The specs are rated voltage 208/230 phase 1 hertz 60 voltage min 197 max 253. Minimum circuit ampacity 18.9.max. Fuse or circuit breaker 30 amps. I was told that on the 12/2 wire I need a 20 amp breaker, but in looking at different 20 amp breakers I see also other nos. as q22o etc. Can you please tell me what is the proper breaker for me to use. Thank you.
This electrical question came from: Kevin, a Homeowner from Canada
Thanks for your electrical repair question Kevin.
- Kevin, the issue is not what size circuit breaker you should install, the issue is to make sure that the installed circuit will be exactly what the air conditioning unit is specifying which in this case is a 30 amp 230 volt circuit.
- The 30 amp circuit requires #10 AWG wire or 10/2 cable that will be protected by a 30 amp circuit breaker.
- Kevin, you should not use 12/2 cable for this circuit because it will be too small because the circuit will be limited to 20 amps and the 18.9 amps required for this load is over 80 percent of the rated load for the 20 amp circuit.
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