ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
twh 3
Recent Posts
Nec circuit protection
by Yoopersup. 11/22/17 03:22 PM
FPE in Germany
by Texas_Ranger. 11/19/17 07:30 AM
Ceiling fan distance from outdoor hot tub
by gfretwell. 11/16/17 02:18 AM
diazed fuses
by Texas_Ranger. 11/13/17 03:02 PM
Theft deterrent alarm
by gfretwell. 11/12/17 01:39 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
242,665 Are you busy
178,880 Re: Forum
170,089 Need opinion
Who's Online Now
0 registered members (), 13 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#188072 - 07/20/09 09:19 PM Common wall resi boxes  
derater  Offline
Member
Joined: Mar 2002
Posts: 179
I'm roughing in a row of townhomes. The adjoining walls are separate; 2- 2x4 walls. Is there any special requirement for the device boxes on these walls p/2005 NEC? Thanks.


Work Gear for Electricians and the Trades

#188074 - 07/20/09 10:13 PM Re: Common wall resi boxes [Re: derater]  
sparkyinak  Offline
Member
Joined: Jul 2007
Posts: 1,328
Alaska
That will be in the local building code requirements. The IBC for example requires a minimum of 24" or solid fire blocking i.e., framings studs.


"Live Awesome!" - Kevin Carosa

#188077 - 07/20/09 10:43 PM Re: Common wall resi boxes [Re: sparkyinak]  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,874
Brick, NJ USA
Derater:

There's a lot of info that you may need:

Is sheetrock going in the cavity between the two 2x4 walls? How about core wall board? It would have to go thru continuous. IF that's the case, you are in regular walls, as long as you don't penetrate thru.

IF there is nothing between the two walls:
Openings on both sides of fire rated wall must be 24" apart. Hilti makes a 'putty pad' (firestoping) that can be wrapped around boxes that are closer but it's $$$

This applies to ALL openings, electric, phone, cable, HVAC, etc.

Also, be careful for a rated ceiling with penetrations.

Your best bet is to check with the Building Inspector before you start to save what could be a lot of grief.



John


Member Spotlight
AllClear
AllClear
Belmond Iowa US
Posts: 44
Joined: August 2005
Show All Member Profiles 
Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.013s Queries: 15 (0.003s) Memory: 0.7515 MB (Peak: 0.8747 MB) Zlib enabled. Server Time: 2017-11-24 12:50:29 UTC