The Electrical Contractor Network

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

Books, Tools and Test Equipment for Electrical and Construction Trades

Topic Options
Rate This Topic
#48381 - 02/10/05 06:51 AM 100 AMP Sub from 150 MAIN
Happi_Man Offline
Member
Registered: 06/12/02
Posts: 213
Loc: Columbus, Ohio - USA
Is there any code against running a 100 AMP Sub Panel off of a 150 AMP Main Breaker Panel? Its a residential application the person who initially tlooked at the job mistook it for a 200 AMP Main and bid for a 100 AMP Sub. Just trying to save the checkbook to avoids eating a 200 AMP upgrade...

Any help?
Top
Work Gear for Electricians and the Trades
#48382 - 02/10/05 07:04 AM Re: 100 AMP Sub from 150 MAIN
iwire Offline
Moderator
Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
Sure, you could connect a 200 amp rated subpanel onto a 100 amp service panel if you wanted to.

There is only one issue to consider and that is the total calculated load or the real demand load for the past year.

So if either the calculated load or the demand load is under 150 amps you are good to go.
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts
Top
#48383 - 02/10/05 07:06 AM Re: 100 AMP Sub from 150 MAIN
Bert66 Offline
Member
Registered: 11/01/04
Posts: 78
Loc: Belle Chasse, La. USA
I don't believe there would be a problem as long as you size your conductors accordingly. I'm assumming that your 100 amp panel is a main lug only. If this were the case then your protection and means of disconnection is back at your 150amp panel. I would check with your local inspector, it may fall into an issue on that level.

Best of luck!!!
Top
#48384 - 02/10/05 06:35 PM Re: 100 AMP Sub from 150 MAIN
Electric Eagle Offline
Member
Registered: 04/20/02
Posts: 928
Loc: Alpharetta, GA
You could have a 100 amp sub off of a 100 amp sub off a 100 amp sub off a 100 amp sub off a 150 amp main. In other words your OK most likely.
Top
#48385 - 02/11/05 05:05 AM Re: 100 AMP Sub from 150 MAIN
Happi_Man Offline
Member
Registered: 06/12/02
Posts: 213
Loc: Columbus, Ohio - USA
Right on. Then 100 AMP Sub'd we be.

Thanks guys.
Top

Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box

Recent Posts
Looking for older post
by sparkyinak
Today at 12:27 AM
License exam
by TRUE POWER
Yesterday at 11:33 PM
Members: Non-Members: Did you know?
by Admin
Yesterday at 02:34 PM
Safety at heights?
by HotLine1
01/21/17 08:51 PM
International Wire Colour Codes
by Texas_Ranger
01/21/17 03:29 PM

Who's Online
1 registered (ampherder), 86 Guests and 15 Spiders online.
Key: Admin, Global Mod, Mod
New in the Gallery:
Desk-mounted "power-board"
Top Posters
gfretwell 9066
Trumpy 8560
pauluk 7693
HotLine1 6833
sparky 5545
Member Spotlight
Tom
Tom
Member Since: 01/01/01
Posts: 1069

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals