120 volt sub panel ?

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Stevenfyeager

Senior Member
Location
United States, Indiana
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electrical contractor
Is a 120 volt, 3 - wire subpanel allowed ? Would like to add a circuit, only one space left in existing T&B panel, and AFCI is required for new circuits. I'm pretty sure AFCI breaker is not available in this old brand panel. Can I install a regular T & B breaker (which I have), then from that panel run a 12-2 to a new subpanel with a modern AFCI breaker ? Thank you.
 
Yes, but I also would be tempted to put in a 4-6 circuit panel and 4-wire feeder, and relocate an existing circuit to make room for the 2p feeder breaker (unless you can get a tandem to make room for it).
 
If you feed a metal box with a metallic wiring method you can accomplish the same goal using a AFCI feed thru receptacle. Might be less expensive.
Thank you, I’d almost forgotten AFCI outlets! 99% of our work is done in jurisdictions that don’t require AFCI, so we never use them. Thanks again!
 
Thanks, why a metal box if I use 12-2 w g ?
Must also be metallic wiring method, to the first outlet. Short nipple to the first outlet can possibly work, unless GFCI protection is needed in that location or if supplying a circuit that isn't allowed to have any other outlets like say SABC's, laundry, etc.
 
Easy solution: wire the AFCI receptacle next to the panel with a short metallic wiring method.

No sub-panel needed.
 
If the new circuit is ran entirely in a metallic wiring method, wouldn't it then NOT require AFCI?
I don't know of any exception that removes the AFCI requirement with metallic installs. The metal to the 1st AFCI device is just an allowable method to provide the protection
 
The way I understand the metal wiring method and metal box is you can just use the AFCI outlet and not have to use the non-existent listed breaker that is required elsewhere in the section.
210.12(5)

Ron
 
I don't know of any exception that removes the AFCI requirement with metallic installs. The metal to the 1st AFCI device is just an allowable method to provide the protection
I thought I read there was an exception, but looking for it, all I found was for fire alarms.
 
Easy solution: wire the AFCI receptacle next to the panel with a short metallic wiring method.

No sub-panel needed.
Doesn't work on SABC's, laundry or any others that aren't allowed to have other outlets on the same circuit. An AFCI device with no receptacle if such thing is available would work though.

I guess if panel is in said kitchen or laundry room it could work in those instances.
 
Doesn't work on SABC's, laundry or any others that aren't allowed to have other outlets on the same circuit. An AFCI device with no receptacle if such thing is available would work though.

I guess if panel is in said kitchen or laundry room it could work in those instances.
Blank face device

 
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