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  1. blvengineers

    Transformer and NEC OCPD code article 450 and 240

    The overcurrent on the primary and secondary are allowed to vary up to 150% of the nominal rating. The wire size can remain per the listed current rating. I have seen fusing on the primary side from 90 amps up to 110 amps. You will not need a primary disconnect if the transformer is in the...
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