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Thread: Conductor Ampacity
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04-23-2008, 12:12 PM #1
Conductor Ampacity
ICC test question:
Number 12 AWG THHN , copper conductors that are located in the attic and are part of the NM cable. The ambient temperature around the conductors will be 110F. The terminal devices are not rated for more than 60degrees C......What is the conductor ampacity for this condition?
A) 20
B) 26
C) 30
D) 35
I get 30 amps from table 3605.1.....the answer is B, 26 amps...what gives?
Thanks as always for your help.
Wen
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04-23-2008, 12:50 PM #2
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04-23-2008, 01:32 PM #3
Re: Conductor Ampacity
If I remember correctly, there is a line in the NEC that states that #14 cannot exceed 15 amps and #12 cannot exceed 20 amps. Even though the tables indicate otherwise. I never understood what that was all about.
Department of Redundancy Department
Supreme Emperor of Hyperbole
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04-23-2008, 01:48 PM #4
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04-23-2008, 03:20 PM #5
Re: Conductor Ampacity
Gunnar,
Wendell asked, and Bob correctly gave, the ampacity rating of the conductor in that condition.
You are referring to the maximum allowable overcurrent protection allowed, and the ampacity of the conductor in all derated conditions must exceed that for that overcurrent protection to be used.
Thus, for the question, Bob is correct, and, for overcurrent protection of that conductor in that condition, you are correct.
It is not separated 'residential' or 'non-residential', that applies to all installations.
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04-23-2008, 04:40 PM #6
Re: Conductor Ampacity
My error. I was thinking of overcurret protection not circuit ampacity.
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04-23-2008, 06:14 PM #7
Re: Conductor Ampacity
JP,
Um... right. I knew that.
This would be why I am a home inspector and not a "code inspector". Guess I am not going to be taking the ICC exam any time soon.
Department of Redundancy Department
Supreme Emperor of Hyperbole
http://www.FullCircleInspect.com/
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