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#98790 - 06/07/06 03:39 AM fire rated walls/ceilings
gserve Offline

Registered: 03/11/03
Posts: 92
Can plastic boxes be used in these areas?

2014 / 2011 NEC & Related Books and Study Guides
#98791 - 06/07/06 05:09 AM Re: fire rated walls/ceilings
Roger Offline

Registered: 05/18/02
Posts: 1779
Loc: N.C.
Yes, see the UL listing(s)for the boxes in question.


#98792 - 06/07/06 06:27 AM Re: fire rated walls/ceilings
George Little Offline

Registered: 01/18/04
Posts: 1492
Loc: Michigan USA
One could also look inside the boxes and in most cases it will have lettering that will say "2 HR W C". In that case it would be suitable for a 2 hour rating in a wall or ceiling. I would qualify my statment by saying that is what I typically see in a non-metalic box used for NM cable. There would possibly be other ratings for other boxes.


[This message has been edited by George Little (edited 06-07-2006).]
George Little

#98793 - 06/07/06 02:12 PM Re: fire rated walls/ceilings
gserve Offline

Registered: 03/11/03
Posts: 92
Thanks for the info. Now how about the cover? I need to use a blank plate on a round plastic nail-on box. I looked at the Arlington plastic blank plate and I don't see a rating on it. Do I need to use a metal blank-up plate? I rather use the pastic one it is white like the ceiling.

#98794 - 06/07/06 03:09 PM Re: fire rated walls/ceilings
HotLine1 Offline


Registered: 04/03/02
Posts: 6792
Loc: Brick, NJ USA
Just had this discussion with UL (Northbrook, Il) today, regarding 'extensions' in fire rated ceiling.

Per the White Book, 'ANY' type of plate can be installed on the rated boxes, as long as the boxes are installed to mfg/UL specs.

My inquiry related to extensions on deep set boxes, 2 hr rated ceiling; answer was yes, Arlington BE-1R is OK (4" round), but, BE-1 for 1-gang device is not. Go figure??



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