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Old 05-19-2009, 06:05 PM   #1
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310.16
I was ask to explain 310.16 at number 12,14 on the wire size guage it has an * symbol which sends you to 240.4(D). how can you explain that in more simple terms.

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Old 05-19-2009, 06:24 PM   #2
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I have no idea what you are asking for.

The (*) sends you to 240.4(D). You read 240.4(D).
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Old 05-19-2009, 06:35 PM   #3
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240.4(D) is what is known as the 'small conductor rule'. Unless the application falls under 240.4(E) or (G), then you use 240.4(D)(2)(3) through (7) for overcurrent protection.
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Old 05-19-2009, 06:45 PM   #4
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you can use the ampacities listed in table 310.16 to apply any derating factors you may have (over 3 CCC, temp, etc) but 240.4(D) gives you maximum overcurrent protection allowed.
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Old 05-19-2009, 07:33 PM   #5
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unless otherwise permitted like for motors,welders ect. right
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Old 05-19-2009, 07:50 PM   #6
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Originally Posted by ampman View Post
unless otherwise permitted like for motors,welders ect. right

Correct, that is where 240.4 E and G come in
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