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Subpanel with out a main? #86812
12/14/03 03:07 PM
12/14/03 03:07 PM
E
Edward  Offline OP
Member
Joined: Dec 2002
Posts: 308
California
Can i install a double pole 100Amp breaker into a 125Amp main lug 24circuit panel and call it the main disconnect for that subpanel?
Please give NEC sections.


edward


Thanks
Edward
2017 / 2014 NEC & Related Books and Study Guides
Re: Subpanel with out a main? #86813
12/14/03 05:14 PM
12/14/03 05:14 PM
R
Redsy  Offline
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
408.16(F) permits this type of installation.

Re: Subpanel with out a main? #86814
12/14/03 05:52 PM
12/14/03 05:52 PM
C
caselec  Offline
Member
Joined: Apr 2002
Posts: 558
San Jose, CA
You need to make sure the loadcenter is listed for using a back-fed main breaker and if so they often will only permit it in a specific location which is designed to accept the required hold down kit. This information should be on the label. Many newer loadcenters are designed to accept main breaker kits that mount in place of the main lugs.

Curt


Curt Swartz
Re: Subpanel with out a main? #86815
12/14/03 08:35 PM
12/14/03 08:35 PM
E
Edward  Offline OP
Member
Joined: Dec 2002
Posts: 308
California
Thanks for the reply.
Can i back feed the busbars with a 100Amp breaker and call that the main? Or it has to be a kit that goes in the place of the main lugs?

Edward


Thanks
Edward
Re: Subpanel with out a main? #86816
12/15/03 12:18 AM
12/15/03 12:18 AM
C
caselec  Offline
Member
Joined: Apr 2002
Posts: 558
San Jose, CA
Yes, you can back feed a breaker in the loadcenter if the instructions on the loadcenter say you can. You are required to secure the back fed breaker so you must purchase a hold down kit that fits the breaker and loadcenter. The hold down kits often will only fit in the one designated position in the loadcenter. If there are provisions to replace the main lugs with a main breaker that is usually the better way to go. Many Square D and GE loadcenters have main breaker kits to replace the main lugs.

Curt


Curt Swartz
Re: Subpanel with out a main? #86817
12/15/03 11:41 AM
12/15/03 11:41 AM
R
Redsy  Offline
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA


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