wire derating

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arnold

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when you have have more than 3ccc
's you must derate when in a pipe. If you don't know the insulation type "stripped nm cable" which column do you use to select the ampacity on 310.16?
 
Re: wire derating

You are permitted to use the 90 degree column for derating purposes. The resulting rating must not exceed the 60 degree column.

I don't know what you mean by "stripped NM".
 
Re: wire derating

if you have 10 conductors you would derate at 50%based on that you should be able to run #10 wire for an additional load in that same pipe of 20 amps with a derating factor of 50%
 
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