Outlet box extensions

[NewKid]

I find outlet box extensions for single gange boxes at Home Depot and elsewhere, but nobody seems to carry extensions for two and three gang boxes. Does anyone know where to find extensions for two and three gang boxes?

[RTF]

Go to an electrical supply house, a much larger selection is available. Or you can shop online, try www.arc-co.com

[NewKid]

Thanks for the link. I should have specified I'm looking for plastic extensions (Carlon, etc.), not metal which is all the online places seem to have. I even called Carlon, and they only make the single gang plastic extensions. I'll keep checking, thanks.

[WireMan]

Do you need a true extension ring, to get more cubic in., or do you need to get an exsiting box flush with the wall, as in an arc shield? If you would like the arc sheild, try this site, http://www.aifittings.com/whnew120.htm. that is Arlington brand fittings. and the part number is " BE2 " BoxExtender2gang. They have BE1, BE3, BE4, and even BE1R for round boxes. These are used like in cabinet work, where you have space between the box edge and trim edge, creating a fire hazard.
But you will need to go to a supply house for these, ive looked for them at lowes and HD to no avail.
These might not be what you need, just a shot in the dark....

[NewKid]

That's it, WireMan, thanks! The issue for me is not a need for more cubic inches, rather to extend the box the width of drywall. This is an issue for SIPS panel construction, wherein the rough electrical is installed in the SIP panel (OSB-foam-OSB sandwich), with the "old work" (even though it's new construction) boxes installed prior to drywall going on. You either have to remove the boxes after the rough electrical inspection (cutting all your ground crimps and removing wire nuts, which are required in my area for rough inspection), apply drywall, then re-install the boxes, OR use extensions, which is obviously easier. Thanks again, that's a big help!