ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

ECN Shout Chat
Top Posters(30 Days)
Admin 19
Recent Posts
fuse rejectors
by NORCAL. 03/29/17 01:44 AM
Old decora style outlets
by NORCAL. 03/29/17 01:41 AM
NFPA stuff
by gfretwell. 03/28/17 08:08 PM
Anyone hiring inspectors?
by HotLine1. 03/27/17 08:03 AM
ESA Arc flash course
by TheShockDoctors. 03/24/17 10:15 AM
New in the Gallery:
SE cable question
Popular Topics(Views)
231,802 Are you busy
166,691 Re: Forum
160,836 Need opinion
Who's Online Now
0 registered members (), 64 guests, and 12 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#188072 - 07/20/09 10:19 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 11:13 PM Re: Common wall resi boxes [Re: derater]  
sparkyinak  Offline
Member
Joined: Jul 2007
Posts: 1,313
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 11:43 PM Re: Common wall resi boxes [Re: sparkyinak]  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,803
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
sparky66wv
sparky66wv
West Virginia
Posts: 2,236
Joined: November 2000
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.010s Queries: 15 (0.003s) Memory: 0.7498 MB (Peak: 0.8748 MB) Zlib enabled. Server Time: 2017-03-30 02:46:20 UTC