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Re: 220 wire size Hello buickanddeere and T-Bone
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Posted by buickanddeere on July 28, 2005 at 17:26:38 from (216.183.146.113):
In Reply to: Re: 220 wire size Hello buickanddeere and T-Bone posted by Bus Driver on July 28, 2005 at 15:30:45:
Something doesn't jive. A 14.25 KW heater draws 60 amps when supplied with 240V, Not 50.96 amp. 50.86 amp and 240 V is 12.2KW. A 12.2KW heater, 7.8 amp fan and 50.96 amp figures with the 60 amp breaker but it's stretch. Usually a breaker isn't loaded past 80% for constant loads. If this heater is 12.2KW, a single 60 amp circuit breaker from your home service ran to a local disconnect at the compressor is absolute minimum. The 60amp inside breaker could be fed from the local disconnect at the compressor. Then power would be taken to the top of the 60 amp breaker to the top of the 30amp breaker for the compressor. That fan has to tie in there? Likely from the bottom of the 60 amp breaker to it's own relay & overload. The compressor and resistive heater won't be running together. A #6 and 60 amp or better a #4 and 80amp breaker from the home breaker panel. Along with a #6 bare ground in the conduit to the disconnect beside the outside compressor/condensor. Sorry but if your electrical inspector or insurance agent sees that 40amp setup. They will throw a fit. It will trip on the heater load. And two supplies to the same AC system from the same home breaker panel maybe frowned upon. A ground rod(s) driven at the compressor is a good idea and maybe required by code.
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