Outlets and gem boxes

If the branch circuit wiring is NM-B cable, (Romex is a Trade Name manufacture of NM-B sheathed cable), then the outlet box really will not be an EMI/RFI issue, jmho.

If NM-B cable is used I prefer a plastic box over a steel ferrous box.

If an old work box, (Gem box, cut in box), must be used then, because of the duplex receptacle you will be using I am not sure the plastic support ears and back supporting tabs will hold up cut into 1/2" or even 5/8" drywall. It might if you cut the hole for the box as tight as possible. (You will not want the box to be able to walk, move, in the drywall when plugging in and unplugging a plug from a receptacle of the duplex outlet). Other wise use a steel cut in box with ears. Even if you use a steel cut in box keep the cut hole as tight as possible, for the same reason as above.

As for pushing the plug into the receptacle the aluminum duplex cover plate will help in reducing the pressure exerted on the cut in box supporting ears whether plastic or steel.

If the wire is #10-2 with ground NM-B cable use a deep box. #10 solid core can be a bare to work with. You need all the room you can get. I also recommend your electrician curl the wire around the side terminal screws instead of using the screw down terminal plate to support the hot and neutral wires.

Jim

Jim thank you so much for your advise. Much appreciated. I am using NM-B #10-2 as you mentioned. The electrician said he will have to use a larger box because of the wings on the Furutech outlet are wider than a standard duplex outlet. I will make sure that he uses the screws to fasten the wires to the outlet. Happy New Year!

Is the wall the outlet will be installed in finished on both sides? Drywall on the new outlet side? Wood studs?
Jim

Yes. the interior wall is sheet rock and the exterior wall is brick. 2x4 construction.

Forgo to mention wood studs.

Outside wall. Cold winter climate?

Has the electrician said what type of bigger box he is planning on using? Will the hole in the wall for the new rough-in box need to be bigger than the duplex cover plate and therefore need to be patched and repainted?

By chance do you have the Furutech GTX D outlet? If so measure the total width 'wing' to 'wing'. What does it measure?

Yes. Outside wall cold climate. He did not say which box he would use. The  sheet rock should be able outlet measures 1.75" wide at the wings. I think the sheet rock should be able to be cut close to the box and not require patching. I think the cover plate will cover the opening in the wall completely with no gaps.