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


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

Roger


#98792 - 06/07/06 09:27 AM Re: fire rated walls/ceilings  
George Little  Offline
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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

#98793 - 06/07/06 05:12 PM Re: fire rated walls/ceilings  
gserve  Offline
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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 06:09 PM Re: fire rated walls/ceilings  
HotLine1  Offline


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Joined: Apr 2002
Posts: 6,853
Brick, NJ USA
Gserve:
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??

John


John


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