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Low Earth Orbit
Lighting & Electrical
Correct feeder cable for distro
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<blockquote data-quote="TJ Cornish" data-source="post: 146015" data-attributes="member: 162"><p>Re: Correct feeder cable for distro</p><p></p><p>Rob, </p><p></p><p>NEC 400.5 is ambiguously written. The correction factor points to table 400.5(A)(1), which has two columns - A, and B, and which column to use for derating is not specified. 80% of column B for #8 wire is 32A. As you mention, 80% of column A is 28A. There are a couple points in the code where non-standard ampacities are allowable to be rounded up to the next standard breaker size.</p><p></p><p>I have never seen 6-5 SOOW used in an L21-30 application - that is pretty massive and inflexible cable. 8-5 SOOW is standard in my part of the world, and I'm happy to not see 10-5.</p><p></p><p>I think you are correct to the [intended] letter of the law, but as mentioned, it doesn't seem to be common practice, and in a similar vein, 6-4 SOOW is probably more common in a 50A two-phase application than the correct 4-4 SOOW.</p></blockquote><p></p>
[QUOTE="TJ Cornish, post: 146015, member: 162"] Re: Correct feeder cable for distro Rob, NEC 400.5 is ambiguously written. The correction factor points to table 400.5(A)(1), which has two columns - A, and B, and which column to use for derating is not specified. 80% of column B for #8 wire is 32A. As you mention, 80% of column A is 28A. There are a couple points in the code where non-standard ampacities are allowable to be rounded up to the next standard breaker size. I have never seen 6-5 SOOW used in an L21-30 application - that is pretty massive and inflexible cable. 8-5 SOOW is standard in my part of the world, and I'm happy to not see 10-5. I think you are correct to the [intended] letter of the law, but as mentioned, it doesn't seem to be common practice, and in a similar vein, 6-4 SOOW is probably more common in a 50A two-phase application than the correct 4-4 SOOW. [/QUOTE]
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Correct feeder cable for distro
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