Sub-panel move


Old 05-19-03, 06:06 AM
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Join Date: Dec 2001
Location: USA
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Sub-panel move

I need to move my 60 amp sub-panel in the attic to another wall.
So...I need to extend the feed.
Can I use a deep 1900 box for the splice?
...or should I use a 6" x 6" box.
Would like to run the wiring under the floor to the new location.
The original feed will not reach to the nearest wall.
The floor, at this time, is 3/4 plywood and is not secured -yet.
Will Code allow me to have the splice box in the attic floor?
Heard you can't hide boxes in a wall or floor.
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Old 05-20-03, 10:46 AM
Join Date: Sep 2000
Location: Fayetteville, NY, USA
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Each conductor that originates outside the box and terminates inside the box shall be counted once per NEC 314.16(B)(1). That means if you have 3 wires going in and three going out you have 6 wires. For #6AWG your box must be 497 cu. cm. or 30.3 cu. in., and is listed as trade size 4" x 2-1/8". That accomodates 6 #6 wires. I recommend oversizing for ease of wiring. 6" by 6" sounds great, or 4" x 4" deep box.

You are correct that boxes may not be concealed. All terminations must be made in an accessible box with floors & walls closed up. If you flush mount the box with an appropriate blank cover plate it'll be OK even if in the floor. I would recommend a solid brass or cast iron or aluminum cover plate to prevent damage from foot traffic.

Hope that helps.


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