I have a 1950s house that has narrow wall boxes, they are about 1-7/8" wide inside, not 2". The boxes are metal, with a metal conduit, in this case there's no ground wire but the conduit is grounded (some others have ground wires).
I'd like to replace some outlets with USB power outlets (Leviton T5632), but they're wider than a regular outlet, about 46 mm or 1-13/16"
The USB outlet fits but scrapes on both sides of the wall box when it's pushed in, which makes me wonder about clearance to the screws.
The screws are recessed and there are plastic shoulders that prevent them getting too close to the walls of the box. When they're tight there' 1/8" clearance.
This isn't so much about inventing some protection that would appear to do the job - plastic sheets with the correct dielectric strength and creepage distance, etc. That might work but could also go wrong later.
My question is whether it's normal or allowed by code that the plastic stand-offs rest against the metal wall of the box? Are they designed for that, and safe when doing that?