Posted by John T on April 26, 2012 at 14:56:58 from (216.249.82.117):
In Reply to: Electricians posted by Dave in Tx on April 26, 2012 at 13:02:48:
Okay, heres my approach, but Im long retired as an EE remember so no warranty.
1) You say a 60 amp breaker and if so it will adequately protect No 6 Copper Wire THWN insulated at 75 degrees C..........
2) You say 40 feet which isnt a whole lot BUTTTTTTT its impossible to compute voltage drop unless we know the true current.....
Soooooooooo unless the load cant tolerate and causes excess voltage drop based on its current draw, No 6 copper may well suffice buttttttttt if voltage drop is exceeded (which I doubt at only 40 feet but cant say not knowing the current) then I would bump it up to 4 gauge.
6 probably but maybe 4 is all I can say not knowing the load characteristics and the current draw, Sorry
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