ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Where is Everyone?
by gfretwell - 11/27/20 06:18 PM
Happy Thanksgiving
by gfretwell - 11/26/20 08:52 PM
Insulated Tools: A Waste of Money?
by HotLine1 - 11/26/20 12:28 PM
Ground fault remover :-)
by NORCAL - 11/26/20 08:13 AM
Work Gloves?
by sabrown - 11/25/20 01:54 PM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 16 guests, and 14 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
400 amp service #47417 01/16/05 04:36 PM
Joined: Mar 2004
Posts: 55
E
eswets Offline OP
Member
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
Re: 400 amp service #47418 01/16/05 04:43 PM
Joined: Jan 2003
Posts: 4,391
I
iwire Offline
Moderator
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
Re: 400 amp service #47419 01/16/05 06:23 PM
Joined: Nov 2002
Posts: 267
W
Wirenuttt Offline
Member
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.

Re: 400 amp service #47420 01/16/05 07:43 PM
Joined: Dec 2004
Posts: 46
T
ToHo Offline
Member
wirenutt.. what do you guys in Mass. run for 400amp UG services?? what would be a typical meter and panel configuration be. Thanks..ToHo

Re: 400 amp service #47421 01/16/05 07:55 PM
Joined: Jan 2003
Posts: 4,391
I
iwire Offline
Moderator
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
Re: 400 amp service #47422 01/16/05 08:28 PM
Joined: Feb 2003
Posts: 687
A
Active 1 Offline
Member
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

Re: 400 amp service #47423 01/16/05 09:12 PM
Joined: Mar 2004
Posts: 55
E
eswets Offline OP
Member
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?

Re: 400 amp service #47424 01/17/05 06:11 PM
Joined: Feb 2003
Posts: 687
A
Active 1 Offline
Member
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

Re: 400 amp service #47425 01/17/05 07:28 PM
Joined: Nov 2002
Posts: 267
W
Wirenuttt Offline
Member
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.

Re: 400 amp service #47426 01/17/05 11:37 PM
Joined: Jun 2003
Posts: 681
P
PCBelarge Offline
Member
Tom
What do you mean by, "bond only one panel"?

Pierre


Pierre Belarge
Page 1 of 2 1 2

Featured:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
BEAMEUP
BEAMEUP
WA
Posts: 27
Joined: December 2004
Show All Member Profiles 
Top Posters(30 Days)
Trumpy 9
Popular Topics(Views)
272,046 Are you busy
205,943 Re: Forum
193,992 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3