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

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Calling all Non-US members!! (Non-US only)
by aussie240
Yesterday at 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
Wow, that was close!
by jraef
11/28/16 07:06 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 9
Texas_Ranger 8
sparkyinak 7
Trumpy 6
Who's Online
0 registered (), 170 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
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

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#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



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