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Join Paul Abernathy as he talks about the various secondary conductor rules (C)(3) through (C)(6) for transformers. Please be sure to watch Part 1 through 4 before watching this part 5 edition in order to be up to speed on the various terms and values being discussed. Based on the 2017 NEC.
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does the rule for not being able to bump up on the secondary conductors still apply in the 2023 code
If you are talking about secondary conductors of transformers then the next size up rule is not applicable. See 240.21(C).