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icepal1999 12-18-2008 08:51 PM

Device Box Size For GFCI
 
Hey All,

Is there a minimum device box size for GFCI's? I have an old house and the device box is damn small - so small I almost have to smash with my hand to get the GFCI to fix in the box. I want to replace the box with a larger size so the GFCi fits nice and the conductors are not crushed/smashed as well.

Thanking you in advance.....

chris75 12-18-2008 08:53 PM

Quote:

Originally Posted by icepal1999 (Post 199923)
Hey All,

Is there a minimum device box size for GFCI's? I have an old house and the device box is damn small - so small I almost have to smash with my hand to get the GFCI to fix in the box. I want to replace the box with a larger size so the GFCi fits nice and the conductors are not crushed/smashed as well.

Thanking you in advance.....


No, but if the box is way to small use a gfci breaker. Or replace the box with more cubic space.

icepal1999 12-18-2008 09:08 PM

Yeah I want to replace the box - is there a min size - say 18cu or 21cu?

Yoyizit 12-18-2008 09:32 PM

My local Code people said a GFI does not require a larger box, but I had the same problem as you.

Logically, a bulky GFI seems to violate single gang box fill requirements if box fill is based on
free air circulation within the box and
current through the wires in the box and
not wanting to damage conductor insulation.

Before you buy the Old Work box, check if you have 3-1/2" depth or 2-1/2" depth between drywall surfaces. Some interior partitions use 2x3s.

jbfan 12-18-2008 10:07 PM

Quote:

Originally Posted by icepal1999 (Post 199934)
Yeah I want to replace the box - is there a min size - say 18cu or 21cu?

How many wires in the box?
2 sets of wire, use the 18 cu, 3 sets of wire use the 21 cu box.
There is not a min, but you do not want to crush the wires.


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