A.F. CAROSELLA ELECTRICAL SEMINARS
What is the secondary overcurrent protection for 45 KVA transformer with a secondary side of 208/120v?NEC 408.16(A-D) Continuous Load125% (215.3) ... Step 2 – Multiple the secondary amperage by the continuous load: 125A X 125% = 156A. Step 3 – NEC 240.6 tells us to increase the amperage to the next fuse/CB size. ... For a 45KVA with 3/0 AWG ... ................
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