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  1. baddriver

    Sizing feeders when load is unknown (NEC code question)

    I'm looking for help determining the answer to the following in accordance with the NEC. A 480v 3-phase 400A panel board with a 400A 100% rated main breaker is being installed. It is fed by a 400A 100% rated breaker in an upstream distribution board. The question is about required ampacity of...

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