Don’t let secondary rules get you wound up
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Similar to feeder taps, covered in the last issue, transformer secondary conductors can be every bit as confusing. Let's take a closer look at 240.21(C) to help clear up any misconceptions. Basic rules As with feeder taps, you can't use the rule provided in 240.4(B) for any transformer secondary conductor. Normally, you can use the next highest overcurrent protective device (OCPD) above the ampacity
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