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#101047 02/05/07 07:18 PM
Joined: Jan 2001
Posts: 1,044
Tom Offline OP
Member
I'm taking an informal poll here.

Should the table apply to a feeder run from a dwelling to a detached shop?


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#101048 02/05/07 07:28 PM
Joined: Jul 2004
Posts: 9,663
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G
Member
No, it is only for the main feeder to the dwelling.


Greg Fretwell
#101049 02/05/07 07:41 PM
Joined: Jan 2003
Posts: 4,391
I
Moderator
The detached shop is not a dwelling unit so that table can not be used.


Bob Badger
Construction & Maintenance Electrician
Massachusetts
#101050 02/05/07 07:57 PM
Joined: May 2002
Posts: 1,716
R
Member
Another no here.

Roger

#101051 02/05/07 09:53 PM
Joined: Jun 2005
Posts: 821
S
Member
No, it is only good for the main feeder and to other panels within the same dwelling. Conductors feeding a detached "shop" must comply with 310.16. So it's ok to run #4 copper feeders to a subpanel on the 2nd floor of a dwelling for 100 amps, but if 100 amps is desired for a detached shop, #2 copper should be run.

#101052 02/05/07 10:55 PM
Joined: Feb 2001
Posts: 308
S
Member
That's kinda dumb ain't it?

#101053 02/05/07 10:56 PM
Joined: Jul 2004
Posts: 9,663
Likes: 4
G
Member
Shock, a sub panel is not a "main feeder" unless that is the source of all current to a dwelling. For example, if you had a 100a disconnect at ther meter feeding a distribution panel that would be a main feeder. If you come to a main panel with other loads and then feed another sub, that is not a main feeder and you us 310.16.


Greg Fretwell
#101054 02/06/07 12:35 AM
Joined: Jun 2005
Posts: 821
S
Member
A main feeder, and all other feeders within the same dwelling, shall comply with Table 310.15(B)(6).

#101055 02/06/07 12:46 AM
Joined: Apr 2002
Posts: 558
C
Member
Quote
A main feeder, and all other feeders within the same dwelling, shall comply with Table 310.15(B)(6).

Not sure where you are getting this from. 310.15(B)(6) can't be used for subpanels.

310.15(B) (6) 120/240-Volt, 3-Wire, Single-Phase Dwelling Services and Feeders For individual dwelling units of one family, two-family, and multifamily dwellings, conductors, as listed in Table 310.15(B)(6), shall be permitted as 120/240-volt, 3-wire, single-phase service-entrance conductors, service lateral conductors, and feeder conductors that serve as the main power feeder to each dwelling unit and are installed in raceway or cable with or without an equipment grounding conductor. For application of this section, the main power feeder shall be the feeder(s) between the main disconnect and the lighting and appliance branch-circuit panelboards(s). The feeder conductors to a dwelling unit shall not be required to have an allowable ampacity rating greater than their service-entrance conductors. The grounded conductor shall be permitted to be smaller than the ungrounded conductors, provided the requirements of 215.2, 220.61, and 230.42 are met.

Curt


Curt Swartz
#101056 02/06/07 03:57 AM
Joined: Mar 2001
Posts: 333
S
Member
Quote
For application of this section, the main power feeder shall be the feeder(s) between the main disconnect and the lighting and appliance branch-circuit panelboards(s).

Isn't any panel located downstrem of the main disconnect a "subpanel"? Or does the main disconnect have to be an overcurrent device, to have any panel downstream a "subpanel"?

steve


Steve
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