I have stranded #4 AWG cable and a 50 amp 220V breaker feeding a sub panel in my shop. How much can the #4 handle? I'd like to put a bigger feeder breaker in the main panel, because 50 amps is going to be a bit low for me. The run from the main panel to the sub panel is approx. 80 feet.
Check the volatge drop limitations in your US Code. Here its 5% max total drop, 3% for the branch circuit, and 2% from the service to the branch circuit.
The 50A breaker and #4 AL was likely chosen carefully after % voltage drop and distance were factored in.
65 amps is correct. My original quote was for copper.
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