curtherrin
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I am about to upsize a service entrance cable to accomodate a new 100 amp panel and subfeed a smaller 60 amp panel next to it. The voltage will be approx. 120-240, single phase, fed from a 200 amp panel that already has a 2 pole 60 amp breaker(ahu), 2 pole 30 amp breaker(ac condensor), 1- 30amp, and about 5- 20 amp single pole breakers. The cable will be approx. 320' long. What size cable should I use for the voltage drop, to maintain less than a 5% drop @ 75C for 80%FLA?