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Old 02-21-2010, 07:34 AM   #16
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Does the 80% of peak rule apply to extension cords?


This whole 80% rule thing is an enigma. So much so that I have heard folks mistakenly state that you cannot load a circuit to over 80%...period. How ludicrous is that?
You ARE NOT creating an instant code violation the moment you have something over 80% of a circuit for 3 hrs and 1 minute.

The continuous load code is for circuit sizing, and is not set in stone for most "transient" items in a home.
Go back and re-read the quote JoeD posted. The key word is expected.

A commercial sign - continuous
Commercial lighting - continuous
Residential lighting - NOT continuous
Residential appliances - NOT continuous
Residential pool pump - questionable, but typically I would say continuous

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Old 02-21-2010, 08:54 AM   #17
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Does the 80% of peak rule apply to extension cords?


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You should open a Law practice. the (ingenious) way that you find loopholes.! Better yet. A Legal Loophole advice firm. Where lawyers can contact for instant (packaged) loopholes!!!
I'm just going by what I read in the code
It's not a loophole if its in the coide book
Problem can be that code points you to different sections, and you can't ignore one section that may also apply

Ah...unless you meant the 2 hour 59 minute thing


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Old 02-21-2010, 09:49 AM   #18
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Does the 80% of peak rule apply to extension cords?


Back to the extension cord question. It is temporary wiring and not covered by the NEC.
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Old 02-21-2010, 10:58 AM   #19
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Does the 80% of peak rule apply to extension cords?


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Originally Posted by Scuba_Dave View Post
I'm just going by what I read in the code
It's not a loophole if its in the coide book
Problem can be that code points you to different sections, and you can't ignore one section that may also apply

Ah...unless you meant the 2 hour 59 minute thing


Thanks Speedy
Yes (Scuba Dave). that's exactly what I had in mind. Not your entire post. Now, that doesn't mean that something's going to happen in Three Hours that wasn't destined to happen in Two Hours, 59 Minutes. But the intent of this regulation was that a circuit that is close to its peak shouldn't be left and forgotten about.!
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Old 02-21-2010, 11:14 AM   #20
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Does the 80% of peak rule apply to extension cords?


I actually kept an eye (actually fingers) on the matter
I checked the cord on a reg basis for heat
I actually had to buy a 12g cord once I realized that the pump peaked at 18.6a

I did have the old wires (THWN) running out there at one point
But I decided the individual wires were more of a danger then a power cord
The old conduit line was dug up in June 06 when the garage foundation went in, I ran the new sub in 07

I don't worry too much about extension cords outside
I worry more about one used & heavily loaded inside
I mark all my cords with the gauge so I can easily pick one
I have (2) of the 12g cords - bought when for some reason they were marked 1/2 off a few years ago
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Old 02-21-2010, 12:30 PM   #21
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Does the 80% of peak rule apply to extension cords?


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Originally Posted by joed View Post
Back to the extension cord question. It is temporary wiring and not covered by the NEC.
while I will agree that the NEC does not cover this aspect of temporary wiring in this situation, I must disagree with your statement that the NEC does not cover temporary wiring. In fact, it is very specific about many aspects of temporary wiring.
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Old 02-21-2010, 12:52 PM   #22
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Does the 80% of peak rule apply to extension cords?


You guys have gone over my head

Will my 15A extension cord be able to handle a (real) continuous load of 15A?
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Old 02-21-2010, 12:54 PM   #23
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Does the 80% of peak rule apply to extension cords?


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You guys have gone over my head

Will my 15A extension cord be able to handle a (real) continuous load of 15A?
If its rated for 15a it should be able to handle 15a depending upon the length, quality of plugs & circumstances
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Old 02-21-2010, 01:09 PM   #24
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Does the 80% of peak rule apply to extension cords?


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You guys have gone over my head

Will my 15A extension cord be able to handle a (real) continuous load of 15A?
It depends. I have seen #16 cords rated at 15 amps. I would not use them for long run times at 15 amps. It also depends on the length. Look very closely at the cord and see what the gauge is. Every cord I have seen has the gauge either imprinted or embossed into the cable.

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