ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
SCADA interview questions and answers 2019
by niamishra. 10/17/18 03:26 AM
PLC/HMI Enclosure C2, D1
by ghost307. 10/16/18 03:31 PM
Tingle off the water spigot
by dsk. 10/15/18 02:36 PM
Board tester power supply?
by JoeTestingEngr. 10/13/18 12:14 AM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
1 registered members (ghost307), 30 guests, and 25 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: 9,298
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
Attic Rat
Attic Rat
Bergen Co.,N.J. USA
Posts: 524
Joined: December 2003
Show All Member Profiles 
Top Posters(30 Days)
sparky 11
Popular Topics(Views)
250,337 Are you busy
187,961 Re: Forum
177,501 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.016s Queries: 15 (0.005s) Memory: 0.9525 MB (Peak: 1.0798 MB) Zlib enabled. Server Time: 2018-10-17 16:29:30 UTC