ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
IRC M1307.3
by gfretwell. 08/18/18 09:08 AM
Light Pole Grounding
by Mosfet74. 08/18/18 08:42 AM
Calling all Non-US members!! (Non-US only)
by Bill Addiss. 08/13/18 05:52 PM
Upgrade the old panel
by gfretwell. 08/13/18 12:20 AM
depth of duckbank
by ghost307. 08/12/18 09:26 PM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 6 guests, and 16 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
NEC 225.30 #207262
10/11/12 07:09 PM
10/11/12 07:09 PM
G
Gregtaylor  Offline OP
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
Re: NEC 225.30 [Re: Gregtaylor] #207265
10/11/12 09:24 PM
10/11/12 09:24 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,252
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
Re: NEC 225.30 [Re: Gregtaylor] #207266
10/11/12 10:27 PM
10/11/12 10:27 PM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 6,997
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

Featured:

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

 

Member Spotlight
waymag
waymag
dallas, texas, USA
Posts: 68
Joined: January 2002
Show All Member Profiles 
Top Posters(30 Days)
BigB 3
Popular Topics(Views)
248,618 Are you busy
186,361 Re: Forum
175,819 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.017s Queries: 15 (0.004s) Memory: 0.9514 MB (Peak: 1.0774 MB) Zlib enabled. Server Time: 2018-08-19 05:39:19 UTC