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fire rated walls/ceilings #98790
06/07/06 06:39 AM
06/07/06 06:39 AM
gserve  Offline OP
Joined: Mar 2003
Posts: 92
Can plastic boxes be used in these areas?

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Re: fire rated walls/ceilings #98791
06/07/06 08:09 AM
06/07/06 08:09 AM
Roger  Offline
Joined: May 2002
Posts: 1,716
Yes, see the UL listing(s)for the boxes in question.


Re: fire rated walls/ceilings #98792
06/07/06 09:27 AM
06/07/06 09:27 AM
George Little  Offline
Joined: Jan 2004
Posts: 1,489
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.

typo's [Linked Image]

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

George Little
Re: fire rated walls/ceilings #98793
06/07/06 05:12 PM
06/07/06 05:12 PM
gserve  Offline OP
Joined: Mar 2003
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.

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

Joined: Apr 2002
Posts: 6,935
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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