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Lighting & Electrical
Correct feeder cable for distro
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<blockquote data-quote="Rob Timmerman" data-source="post: 145995" data-attributes="member: 172"><p>Re: Correct feeder cable for distro</p><p></p><p></p><p></p><p>Nope, not for flexible cables. For flexible cables, three current-carrying conductors of 8AWG are rated for 35A (neutral is not considered current-carrying if it only carries the unbalanced sum of the phase conductors and there are no appreciable harmonics). But for 4 current-carrying conductors (as is the case where you need to worry about harmonics), you need to reduce the current-carrying capacity to 80% of that, or 28A. Since 28<30, you need to step up a wire size to 6AWG. See tables 400.5(A)(1) and 400.5(A)(3) [unless things have changed since 2011, which is the latest version of the NEC I've got handy].</p></blockquote><p></p>
[QUOTE="Rob Timmerman, post: 145995, member: 172"] Re: Correct feeder cable for distro Nope, not for flexible cables. For flexible cables, three current-carrying conductors of 8AWG are rated for 35A (neutral is not considered current-carrying if it only carries the unbalanced sum of the phase conductors and there are no appreciable harmonics). But for 4 current-carrying conductors (as is the case where you need to worry about harmonics), you need to reduce the current-carrying capacity to 80% of that, or 28A. Since 28<30, you need to step up a wire size to 6AWG. See tables 400.5(A)(1) and 400.5(A)(3) [unless things have changed since 2011, which is the latest version of the NEC I've got handy]. [/QUOTE]
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Correct feeder cable for distro
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