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100 AMP Sub from 150 MAIN #48381
02/10/05 09:51 AM
02/10/05 09:51 AM
H
Happi_Man  Offline OP
Member
Joined: Jun 2002
Posts: 206
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?

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Re: 100 AMP Sub from 150 MAIN #48382
02/10/05 10:04 AM
02/10/05 10:04 AM
I
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
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
Re: 100 AMP Sub from 150 MAIN #48383
02/10/05 10:06 AM
02/10/05 10:06 AM
B
Bert66  Offline
Member
Joined: Nov 2004
Posts: 80
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!!!

Re: 100 AMP Sub from 150 MAIN #48384
02/10/05 09:35 PM
02/10/05 09:35 PM
E
Electric Eagle  Offline
Member
Joined: Apr 2002
Posts: 914
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.

Re: 100 AMP Sub from 150 MAIN #48385
02/11/05 08:05 AM
02/11/05 08:05 AM
H
Happi_Man  Offline OP
Member
Joined: Jun 2002
Posts: 206
Columbus, Ohio - USA
Right on. Then 100 AMP Sub'd we be.

Thanks guys.


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