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circuit breaker transformer service device enervac

Transformer Secondary Conductor and Breaker Sizing | Mike ...· Circuit breaker = 350A Secondary conductors = (4) #500kcmil + (1) #1/0 gnd Here is my approach: FLA of a 112.5kVA transformer secondary = 312A Circuit breaker size is 312 x 125% which = 390A. Table 450 says to round up, so would it be a 400A? Secondary conductors would be #600kcmil. 600kcmil is rated for 420A.

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