Quote:
Originally Posted by red-beard
A 60A breaker on the 208 VAC side is undersized. You need a 70A breaker. The #4 wire is fine.
45A * 240/208 = 51.9A. BUT you must size this up by 125% to meet NEC -> 64.9, round up to 70A
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Is not having a 70A breaker a safety issue? Why is it not ok to have a lower rated breaker? This assumes the load will not trip the 60A breaker in normal circumstances.