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#93735 - 06/08/05 07:15 PM Horse Barn Wiring Methods  
shortcircuit  Offline
Member
Joined: Jun 2004
Posts: 608
massachusetts
Is romex (NM) allowed to be used in the walls and ceilings of a horse barn in areas specified by 547.1 where it will be concealed by a finish surface such as wood on the walls and plastered ceilings?

shortcircuit


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#93736 - 06/08/05 07:41 PM Re: Horse Barn Wiring Methods  
Gregtaylor  Offline
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Joined: Mar 2005
Posts: 212
Boise, Idaho, USA
The way I read it, I think you're OK.


#93737 - 06/09/05 02:02 PM Re: Horse Barn Wiring Methods  
shortcircuit  Offline
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Joined: Jun 2004
Posts: 608
massachusetts
Can anyone explain what the last sentance of 334.10(3) means or maybe have a link to such list as described?

"Cables shall be concealed within walls, floors, or ceilings that provide a thermal barrier of material that has at least a 15-minute finish rating as identified in listings of fire-rated assemblies."

My concern is if romex (NM) is concealed behind finish walls of wood on the interior of a horse barn, is the wood wall finish acceptable as a 15-minute fire-rated assembly?

shortcircuit


#93738 - 06/09/05 03:04 PM Re: Horse Barn Wiring Methods  
earlydean  Offline
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Joined: Dec 2003
Posts: 751
Griswold, CT, USA
As I recall, 1/2 inch wallboard has a 15 minute rating.
Let me check the UL book for others.


Earl

#93739 - 06/09/05 03:17 PM Re: Horse Barn Wiring Methods  
earlydean  Offline
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Joined: Dec 2003
Posts: 751
Griswold, CT, USA
Nope, no wood. All the listed assemblies are gypsum wallboard, plaster, cement block, masonry or 24 gauge metal panels.


Earl

#93740 - 06/09/05 03:19 PM Re: Horse Barn Wiring Methods  
earlydean  Offline
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Posts: 751
Griswold, CT, USA
Oh yeah, and concrete.


Earl

#93741 - 06/09/05 03:53 PM Re: Horse Barn Wiring Methods  
earlydean  Offline
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Posts: 751
Griswold, CT, USA
Now you got me going.

My rule of thumb is just not sufficient. the finish ratings go all over the chart, depending on the manufacturer and the product. Examples: American Gypsum Co. 5/8 inch Gypsum board Types AGX-1,2&3 have 23 minute finish ratings. AGX-5 has a 26 minute finish rating. US Gypsum Co. 1/2 inch Gypsum Wallboard (GWB) Types AR, FRX-G, SCX, SHX or WRX all have a 29 minute finish rating.
There are hundreds more. But, the lowest rating I could find for 1/2 inch GWB was 20 minutes. The rating for some 3/8 inch GWB was 8 minutes, so watch out!
The assembly also required paper tape over the joints, and usually a minimum of 2 coats of joint finishing compound.

Sounds like, to make your installation code compliant, you need to add 1/2 GWB over the walls of the barn where you have run the romex.


Earl

#93742 - 06/09/05 04:12 PM Re: Horse Barn Wiring Methods  
earlydean  Offline
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Joined: Dec 2003
Posts: 751
Griswold, CT, USA
You can research them yourself at: http://www.ul.com/fire/building.html
Click on the picture of the front cover of the building materials directory.


Earl

#93743 - 06/09/05 04:15 PM Re: Horse Barn Wiring Methods  
earlydean  Offline
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Joined: Dec 2003
Posts: 751
Griswold, CT, USA
http://database.ul.com/cgi-bin/XYV/...d=1074327030&cfgid=1073741824&ve rsion=versionless&parent_id=1073984818&sequence=1


Earl

#93744 - 06/09/05 04:58 PM Re: Horse Barn Wiring Methods  
shortcircuit  Offline
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Joined: Jun 2004
Posts: 608
massachusetts
Thanx earlydean, but I couldn't navigate through to where I could find specific listings on sheetrock and wood?

shortcircuit


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