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#194159 - 05/13/10 03:41 PM Article 310.15.(B)(2)(c)  
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
How is Article 310.15.(B)(2)(c) applied in your area? What is used for a base temperature? Can one use the information on the weather channel for your area's average temperature on the hottest month of the year? Do you have to use the ASHRAE Handbook? How about that 3 questions for the price of one smile


George Little

2017 / 2014 NEC & Related Books and Study Guides

#194163 - 05/13/10 05:29 PM Re: Article 310.15.(B)(2)(c) [Re: George Little]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,143
Estero,Fl,usa
I cross posted this over on Fl IAEA to see what they say.

I never had an inspection on a roof since this article appeared.


Greg Fretwell

#194166 - 05/13/10 06:06 PM Re: Article 310.15.(B)(2)(c) [Re: gfretwell]  
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
Thanks Greg, since I live in a northern state, we don't have much of an issue with this type of installation but I'm sure you might or possibly some other state.


George Little

#194179 - 05/14/10 12:12 PM Re: Article 310.15.(B)(2)(c) [Re: George Little]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,143
Estero,Fl,usa
I got this back From Bryan Holland (BHGravity here)
Quote

I am using the guidelines established by the CDA. As indicated in the FPN, the CDA guidelines utilize the average of the 2% ASHRAE design temperatures for each region and major city in the state.

The guildelines and sliding scale card can be obtained FREE from www.copper.org
_________________________
Bryan P. Holland, ICC Electrical Code Official
CBO, Plans Examiner, Inspector, Instructor
Secretary - IAEI Florida Gulf Coast Division
Secretary - BOAF Gulf Coast Chapter






Greg Fretwell

#194195 - 05/14/10 10:13 PM Re: Article 310.15.(B)(2)(c) [Re: gfretwell]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,143
Estero,Fl,usa


Greg Fretwell

#194228 - 05/16/10 09:13 PM Re: Article 310.15.(B)(2)(c) [Re: gfretwell]  
Tesla  Offline
Member
Joined: Jun 2004
Posts: 1,273
Sacramento, CA
In Las Vegas the local ordinances super-cede this Code provision.

Ground temperatures are considered such a threat that the typical PVC-under-slab run is restricted to absolute minimums and the conductors get derated.

Hence, a grocery store ( example ) has all of its circuits run in EMT overhead and de-rated one bump.



Tesla


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