Nonmetallic boxes with metallic switch plates?

[jumper]

That's what I was thinking. Never seen a mud ring that would fit a plastic box

A regular plastic box, prolly not. A PVC junction box perhaps, but OP says ENT and double gang boxes, so it is a bit strange.

Strange also is how he attached ENT to the boxes. IIRC the plastic boxes have cable clamps. so I am guessing he drilled them. IDK. Do some plastic boxes have knock outs?

 

[JFletcher]

A regular plastic box, prolly not. A PVC junction box perhaps, but OP says ENT and double gang boxes, so it is a bit strange.

Strange also is how he attached ENT to the boxes. IIRC the plastic boxes have cable clamps. so I am guessing he drilled them. IDK. Do some plastic boxes have knock outs?

The carlon 2 gang(1900) boxes we used had bosses to accept the snap in ent fitting. i cant seem to find them atm. they were garbage pulling wire thru in a riser fashion as the ent fittings were offset and the boxes werent stiff enough. removing a busted snap in fitting was a pita.

as to your question, yes plastic boxes have factory ent kos:

http://www.homedepot.com/p/Carlon-2...S9-l6t7uwZK18-DA0f9bkaAvEk8P8HAQ&gclsrc=aw.ds