ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Fuse breakers for my home!!
by dougwells. 05/19/19 03:33 PM
Chinese wire symbols?
by Texas_Ranger. 05/19/19 03:09 PM
Pool - Daisy chained GFCI
by gfretwell. 05/18/19 01:30 PM
110.26 working clearances
by HotLine1. 05/14/19 02:08 PM
Parallel SER Cables
by George Little. 05/03/19 05:42 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 7 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Does 310.15 overrule temperature limitations? #182185
11/20/08 05:22 PM
11/20/08 05:22 PM
M
Mills  Offline OP
New Member
Joined: Sep 2004
Posts: 6
Carolina
I can't seem to reconcile T 310.15(B)(6) with 110.14(C)(1)(b)(1). What do you think?

This is a residential single phase overhead service drop, going to a GE meter center with feed thru lugs. The 200A main will protect the feeder to a 200A subpanel inside. Local jurisdiction using 2005 NEC.

Does 2005 NEC T310.15(B)(6) allow 4/0 Al for service and feeder, or is that trumped by the manufacturer’s label [Use 60/75C conductors], which would require 250 kcmil?

Thanks,
Mills

2017 / 2014 NEC & Related Books and Study Guides
Re: Does 310.15 overrule temperature limitations? [Re: Mills] #182187
11/20/08 06:04 PM
11/20/08 06:04 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,359
Estero,Fl,usa
Two different things.
310.15(B)(6) gives you a break on the ampacity because they know there is a lot of diversity in the total load of a dwelling. You are not using 310.16 at all.


Greg Fretwell
Re: Does 310.15 overrule temperature limitations? [Re: Mills] #182221
11/21/08 10:25 AM
11/21/08 10:25 AM
S
SteveFehr  Offline
Member
Joined: Mar 2005
Posts: 1,213
Chesapeake, VA
Originally Posted by Mills
Does 2005 NEC T310.15(B)(6) allow 4/0 Al for service and feeder, or is that trumped by the manufacturer’s label [Use 60/75C conductors], which would require 250 kcmil?
The safe bet is always to ask your AHJ as theirs is the only opinion that matters, but I concur with Greg, 310.15(B)(6) requires 4/0, and specifically states you don't have to go larger. 310.16 does not apply to this cable.


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
sbi
sbi
indiana
Posts: 47
Joined: March 2008
Show All Member Profiles 
Top Posters(30 Days)
Popular Topics(Views)
255,019 Are you busy
191,151 Re: Forum
180,896 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.017s Queries: 15 (0.004s) Memory: 0.9522 MB (Peak: 1.0795 MB) Zlib enabled. Server Time: 2019-05-20 05:08:55 UTC