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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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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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