ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
2023 CEU Course
by renosteinke - 07/12/24 03:26 PM
Counterfeit Code Books?
by Comprehensiveedu - 07/12/24 12:16 PM
Old low volt E10 sockets - supplier or alternative
by gfretwell - 07/11/24 08:51 PM
1&2 family services
by gfretwell - 07/11/24 08:33 PM
Safety at heights?
by gfretwell - 07/10/24 09:23 PM
New in the Gallery:
This is a new one
This is a new one
by timmp, September 24
Few pics I found
Few pics I found
by timmp, August 15
Who's Online Now
0 members (), 440 guests, and 21 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Sep 2004
Posts: 6
M
Mills Offline OP
New Member
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

Stay up to Code with the Latest NEC:


>> 2023 NEC & Related Reference & Exam Prep
2023 NEC & Related Reference & Study Guides

Pass Your Exam the FIRST TIME with the Latest NEC & Exam Prep

>> 2020 NEC & Related Reference & Study Guides
 

Joined: Jul 2004
Posts: 9,948
Likes: 34
G
Member
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
Joined: Mar 2005
Posts: 1,213
S
Member
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.


Link Copied to Clipboard
Powered by UBB.threads™ PHP Forum Software 7.7.5