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This video is part of the Electrical Code Academy, Inc. Electricians Exam Prep Series. This video covers the very basics of sizing conductors for motors, short-circuit and ground fault protective devices and overloads for single phase motors. This is designed as an introduction into motor calculations and not an advanced series.
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Interestingly, in 430.52(C) in the 2023 NEC, those exceptions are revised. Instead of exceptions, it’s outright permitted now.
But, you still have to meet certain conditions like before, of course. Doesn’t change things much.