Per NEC 314.21Repairing Plaster and Drywall or Plasterboard. Plaster, drywall, or plasterboard surfaces that are broken or incomplete shall be repaired so there will be no gaps or spaces greater than 3mm (1/8") at the edge of the box or fitting.
OK, then, does anyone ever enforce this? There are plates made with the express purpose of covering oversize cuts. (Ironically, I've even seen them advertized as such in the IAEI magazine). What do you think?...S
I agree with Bill's perspective as to the use of these.There is no excuse for a carpenter or drywall hanger to leave an oversized hole around the box for the electrician to have to deal with.. I never hesitate to call this to their attention, and the attention of their superiors if need be. Sometimes it ruffles their feathers, but who cares. Occasionally I have had to quote NEC 314.21 to them. Then I let them know that the oversized holes are to be repaired or I don't trim out !! No exceptions.
bill, section 709.6 calif.bldb. code(1997 ubc)addresses the firestopping methods.in concrete walls ;concrete,grout,or mortar the full thickness of the wall or the thickness required to maintain the rating is o.k.fire caulking or other listed systems are acceptable in other types of walls. the material used to fill the annular space shall prevent the passage of flame and hot gases sufficient to ignite cotton waste when subjected to ubc standard 7-1 time temperature fire conditions under a minimum positive pressure differential of 0.01inch of water column(2.5pa)at the location of the penetration for the time period equivelent to the fire rating of the construction penetrated.that's the technical explanation!