For most work I prefer the flexible & virtually indestructible nylon plates made by Hubbell. They do have the drawback of not snugging up to the wall as tight as regular plastic & this can be a problem on 3 gang or larger boxes.
Few things are harder to put up with than the annoyance of a good example.
#1284 - 05/06/0110:40 PMRe: 1 more .. Metal or Plastic Cover Plates?
I don't like how the nylon plates "dimple" when the screws are tightened. I guess you have to leave them loose to make it look right. Just has a cheap plastic look compared to the hard plastic ones...(boy that sounds dumb...)
I use metal plates with handy boxes or in commercial applications where metal plates are used elsewhere. (Stainless for food services, etc.)And, yes, only with metal boxes.
I do have concerns about the covers having enough ampacity to trip the OCPD during a short to ground. Joe's pics in the violations section give me such a concern.
In using deep handy's with GFCI's, are there metal "Decora" covers available for handy boxes? I haven't been able to find them, and the plastic covers don't fit well on a handy box.
-Virgil Residential/Commercial Inspector 5 Star Inspections Member IAEI
#1285 - 05/07/0104:11 PMRe: 1 more .. Metal or Plastic Cover Plates?
you shouldn't use a metal blank cover on a plastic box right?
That sounds right. If you solder a ground wire onto it and bond it to the ground wire in the box, that ought to be okay. A lot of work...
#1286 - 05/07/0109:14 PMRe: 1 more .. Metal or Plastic Cover Plates?
I'm with sparky on the plastic box issue. In residential applications, I like the hard plastic type because I think they look better than nylon. As far as steel plates are concerned, I like them in almost all commercial applications. Device cover plates that are UL listed have been tested, and are perfectly acceptable by the NEC.