ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

ECN Shout Chat
Top Posters(30 Days)
Admin 19
Recent Posts
Anyone hiring inspectors?
by HotLine1. 03/27/17 08:03 AM
Old decora style outlets
by Admin. 03/25/17 11:40 AM
ESA Arc flash course
by TheShockDoctors. 03/24/17 10:15 AM
fuse rejectors
by HotLine1. 03/24/17 07:53 AM
Another Forum Update
by Admin. 03/22/17 03:04 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
231,583 Are you busy
166,394 Re: Forum
160,691 Need opinion
Who's Online Now
1 registered members (HotLine1), 76 guests, and 15 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
Page 1 of 2 1 2
#47417 - 01/16/05 05:36 PM 400 amp service  
eswets  Offline
Member
Joined: Mar 2004
Posts: 55
Lansing, IL, USA
The state I used to work it, it was common pratice for a 400amp residential service to really be a 320amp. The meter was a 320amp rated meter socket that feed 2 200amp (main breaker) panels with 2" pipes and 3/0's to each panel. I have changed to a different region, and am wondering if this is standared everywhere or if this is not the right way to do this.


Work Gear for Electricians and the Trades

#47418 - 01/16/05 05:43 PM Re: 400 amp service  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
It is fine, a 320 meter is rated 320 amps continuous, 400 amps non-continuous.

If a 400 amp service is properly sized it will not exceed 320 amps continuously.


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#47419 - 01/16/05 07:23 PM Re: 400 amp service  
Wirenuttt  Offline
Member
Joined: Nov 2002
Posts: 267
Massachusetts
Common practice in Mass. 320 amp continuous for a 400 amp service. 80%. I believe you have to be the full 400 amp on commercial services. Most of the electricians around here install it exactly how you explained except they use 4/0-3 SEU/AL. No pipe. Your way is much better, I guess around where I am they go the bare minimum requirements.


#47420 - 01/16/05 08:43 PM Re: 400 amp service  
ToHo  Offline
Member
Joined: Dec 2004
Posts: 46
N.Y.
wirenutt.. what do you guys in Mass. run for 400amp UG services?? what would be a typical meter and panel configuration be. Thanks..ToHo


#47421 - 01/16/05 08:55 PM Re: 400 amp service  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Quote
I believe you have to be the full 400 amp on commercial services.


The only reason I can see that requirement is if you used 100% rated breakers and equipment.

A typical 400 amp breaker is only UL listed for 320 amps continuous or 400 amp non-continuous.

Bob


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#47422 - 01/16/05 09:28 PM Re: 400 amp service  
Active 1  Offline
Member
Joined: Feb 2003
Posts: 687
Grayslake IL, USA
Thats how the 400 amp resedential are set up around here in IL. We don't call it a (2) 200 or 320 amp. Maybe more of a sales thing. Don't want to be pricing out a 320 amp when the other EC has the same set up calls it a 400 amp.

Tom


#47423 - 01/16/05 10:12 PM Re: 400 amp service  
eswets  Offline
Member
Joined: Mar 2004
Posts: 55
Lansing, IL, USA
Tom,
Im in IL I think around your area. Suburbs of Chicago. So using a 320amp meter socket with 2/200amp panels is ok for the 400 amp service?


#47424 - 01/17/05 07:11 PM Re: 400 amp service  
Active 1  Offline
Member
Joined: Feb 2003
Posts: 687
Grayslake IL, USA
Yep.

At the supply we just ask for a 400 amp pedistal but they know we mean 320 amp. Milbanks catolog for Com Ed only shows single phase 320 not 400 amp meter housings. Com Ed resi feeds underground are normaly 200 and 320 a. Overhead 100, 200, and 320 a.

We would only bond one panel and would run a larger water pipe ground than a single 200 a service, I think 1ott. You could do it other ways.

Tom


#47425 - 01/17/05 08:28 PM Re: 400 amp service  
Wirenuttt  Offline
Member
Joined: Nov 2002
Posts: 267
Massachusetts
TOHO; Mostly the Milbank # 2448-X meter socket. One EC uses 500 kcmil xhhw. Murray also makes a unique 400 amp double main break panel that's kind of interesting. Guess it depends on your situation.


#47426 - 01/18/05 12:37 AM Re: 400 amp service  
PCBelarge  Offline
Member
Joined: Jun 2003
Posts: 681
Dobbs Ferry, NY, USA
Tom
What do you mean by, "bond only one panel"?

Pierre


Pierre Belarge

Page 1 of 2 1 2

Member Spotlight
HappyElectrician
HappyElectrician
Penn USA
Posts: 31
Joined: December 2011
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.025s Queries: 15 (0.004s) Memory: 0.8139 MB (Peak: 0.9884 MB) Zlib enabled. Server Time: 2017-03-27 20:34:06 UTC