The dimensions what is stated for the receptacle is 3"x2"x2-1/2" (they state standard single gang electrical wall box). However i have an old handy end run work box that is 3-1/2" x 1 3/4" to the metal screws which is the end of the depth. When I measure the depth of the usb it truly measures 1-3/4" totally. However from their metal screw holders on both end of the usb it is 1 1/4" to the end of their receptacle and to their front from the metal holders it is 1/2". After screwing it in the handy box it protrude only 3/16 from the wall plate not 1/2". Is 3/16 acceptable to NEC standards though they never defined 'flush or thereof'. I know it is suppose to be flush or an 1/8 example gfci to protrude? And how could leviton say it is 2 1/2" depth which it isnt? And finally is there a way that if i decide to keep my old handy metal box to reduce that protrusion by a 1/16 or so? Will do whatever to be in conformity?
. Im sorry for making this a big deal but if your playing with electricity it should be clearly spelled out.
Best Answer
To start, all devices should be mounted flush into the wall unless they are designed otherwise. This is to prevent fire and shock hazard. Leviton and other devices are giving you a box size not only to fit the device but provide air space for heat disbursement.
NEC Article 314 has instructions on how many devices by cubic inch, wire splices, and number and size of conductors you can put into one box. I would follow that rather than instructions in a box or someone who would say it it fits it's ok.
Is there any way you could remove the box and install a cut-in or remodel box that is a required size? If I could that's how I would go.