Amperage Derating on General Use Cord sets and Power Supply cords

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croverwin

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I have an outdated verision of the NEC. (2005) There is a table which shows acceptable ampares up too 50', and then from 50-100' for different cord types. Table 114.2.
I was wondering if anyone knew of an equation that was used, to figure out the derating.
I am currently tryin to build a L6-20 extension cord at 150' using 10/3 SJT. I know what the voltage loss would be if i ran the full 20 amps however to be to NEC code i was wondering what the maximum amperage rating would be.
If there is a formula that would be great! If not, if you know how they came up with the deratings that would be fantastic.

Thanks!!!!
Croverwin
 
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croverwin

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Thanks

Thanks

I personally would not want to carry that thing around. I have a friend with a mobile Taco truck and he is going to a venue where the closest power source is 150' away. Im pretty handy with building electrical cords, however i do not want to cause a fire, or risk someones well being. Therefore i was trying to figure out what the acceptable amperage would be for that length. I wish the NEC would include formulas they used to come up with these charts. Or atleast the reasoning behind the madness.
Thanks for taking the time to reply Z!
CRoverWin
 
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