Gaps in the Junction Box

[kilowattEE]

I have a guy who used a standard octagon blank cover on a concrete junction box. The result has gaps. He should have used a concrete box cover plate. Can anyone remember where the Code spells out the maximum gap allowed? or another Code that would have him install the correct cover?

 

[marti smith]

See 314.21 Repairing Noncombustible Surfaces.
Noncombustible surfaces that are broken or incomplete around boxes employing a flush-type cover or faceplate shall be repaired so there will be no gaps or open spaces greater than 3 mm ( in.) at the edge of the box.

 

[raider1]

314.25 requires a cover plate but does not specify any spaces left around the cover.

110.3(B) would apply if a 4/0 cover is most likely only listed to be used on a 4/0 box.

Chris

 

[kilowattEE]

Here's what we came up with in the office:
314.28 (C) ?covers compatible with the box?, which this is not. 314.41 also states covers ?listed for the purpose? which this is not.

 

[tkb]

Here's what we came up with in the office:
314.28 (C) ?covers compatible with the box?, which this is not. 314.41 also states covers ?listed for the purpose? which this is not.

I agree, that one nails it.

A 4" octagon cover is not compatible with a deck box.