temp rating

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Gaffen99

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new jersey
Inspector failed me for using a #2 alum. SER cable for a sub panel. I used a 90 amp breaker for the ocp to a 125amp main lug sub. All terminations are rated at 75 degrees, what's his problem? Or do I have one? If he is mistaken, and stands firm, what do I do other than change the breaker to an 80, which is not a big deal but its principle. He has been a pain in the @#& since the start.
 
depends on what Code cycle is being used. If you are on the '08 Code, #2 AL SE cable used interior would have a 75 amp rating per 338.10
 
augie47 said:
depends on what Code cycle is being used. If you are on the '08 Code, #2 AL SE cable used interior would have a 75 amp rating per 338.10
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Gus,
The rule in 338.10 for the 2008 code requires compliance with all of the rules in Article 334 when SE cable is used for interior feeders or branch circuits. That would limit you to the 60?C ampacity, which is 75 amps for #2 aluminum. I expect that is what you intended to say in your post.
 
did Mr. Inspector say why he was rejecting the installation ?
 
NJ will be under the 2005 for a few more months. Under the 2005 SER can be used at the 75 degree C rating which is 90 amps so you are correct. Tell him he's incorrect or speak to his boss.
 
Gaffen99 said:
Thanks infinity, the reason was it should be rated at 60 degree column, I think he maybe missed the additional lines in 110.14.
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So in this case it has nothing to do with the code cycle but with 110.14(C)(1)(a)(3). IMO an inspector should have known this since it's a very basic rule but I guess that we can all make mistakes.
 
I don't see why you are getting a correction without a "reason why" noted on the correction?? Normally (at least here they do) they will write which code they feel you violated.
 
TexasMaster said:
I not seeing were you find that:confused:
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(6) 120/240-Volt, 3-Wire, Single-Phase Dwelling Services and Feeders. For individual dwelling units of one-family, two-family, and multifamily dwellings, conductors, as listed in Table 310.15(B)(6), shall be permitted as 120/240-volt, 3-wire, single-phase service-entrance conductors, service-lateral conductors, and feeder conductors that serve as the main power feeder to each dwelling unit and are installed in raceway or cable with or without an equipment grounding conductor. For application of this section, the main power feeder shall be the feeder between the main disconnect and the panelboard that supplies, either by branch circuits or by feeders, or both, all loads that are part or associated with the dwelling unit. The feeder conductors to a dwelling unit shall not be required to have an allowable ampacity rating greater than their service-entrance conductors. The grounded conductor shall be permitted to be smaller than the ungrounded conductors, provided the requirements of 215.2, 220.61, and 230.42 are met.
 
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