How many amps on #4 AWG - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 10-15-2005, 11:33 AM   #1 (permalink)
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How many amps on #4 AWG

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.
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Old 10-15-2005, 01:12 PM   #2 (permalink)
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90 amps with a THHN jacket. What does it say on the wire?
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Old 10-15-2005, 04:44 PM   #3 (permalink)
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Quote:
Originally Posted by Bronken
What does it say on the wire?
KAISER ALUMINUM -S (UL) 4AWG AL XLPE 600V USE RHW OR RHN
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Old 10-15-2005, 06:14 PM   #4 (permalink)
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65A in Canada

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.
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Old 10-15-2005, 06:55 PM   #5 (permalink)
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65 amps is correct. My original quote was for copper.
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