ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
dsk 13
Admin 8
Recent Posts
Grid problem??
by annemarie1. 08/21/17 01:10 PM
Bathroom electrical
by doc. 08/19/17 06:53 AM
electircal ageing test on IPC
by SIAME. 08/15/17 02:43 AM
electrical aging test on IPC
by gfretwell. 08/15/17 12:27 AM
"Line level" audio on Cat 5?
by gfretwell. 08/08/17 10:39 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
240,044 Are you busy
175,661 Re: Forum
167,887 Need opinion
Who's Online Now
0 registered members (), 70 guests, and 13 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#207262 - 10/11/12 07:09 PM NEC 225.30  
Gregtaylor  Offline
Member
Joined: Mar 2005
Posts: 212
Boise, Idaho, USA
If I have underground utility service to a 400 amp meter/main/dist service (such as Eaton HP40SH) mounted on the exterior of a residence in which there is distribution to 2-200 amp panels that are mounted indoors back-to-back with the service and protected by 200 amp circuit breakers at the outdoor panel, have I violated 225.30 by bringing multiple feeders to the building?


2017 / 2014 NEC & Related Books and Study Guides

#207265 - 10/11/12 09:24 PM Re: NEC 225.30 [Re: Gregtaylor]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,103
Estero,Fl,usa
The Building is only being served by one service with a single service disconnect and that happens to be on the outside of that building, per 270.70(A)(1). If this was on a pedestal out in the yard you might have a question but you are simply talking about distribution within the building.
IMHO

In fact you could run this inside with a single feeder and exploit 310.15(B)(6). I think you need to use 310.16 if it is 2 feeders.


Greg Fretwell

#207266 - 10/11/12 10:27 PM Re: NEC 225.30 [Re: Gregtaylor]  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,858
Brick, NJ USA
I agree with Greg. This is a common install here, using a 320/400 amp meter base, and two (2) 4/0 feeders into two panels w/200 amp MOCP back to back with the meter pan.

The exterior main is required when the panels are not 'back-to-back', or the client/EC opt to install it.

(Note 270.70(A)(1) in Gregs post is actually 230.70(A)(1)


John


Member Spotlight
Posts: 165
Joined: March 2007
Show All Member Profiles 
Featured:

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

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.011s Queries: 15 (0.003s) Memory: 0.7528 MB (Peak: 0.8782 MB) Zlib enabled. Server Time: 2017-08-21 23:35:20 UTC