insulation behind junction box?


  #1  
Old 09-21-14, 12:25 PM
Q
Member
Thread Starter
Join Date: Jun 2014
Location: Canada
Posts: 1,658
Received 1 Upvote on 1 Post
insulation behind junction box?

I need to install a junction box to extend some wire by only around 12inches.
In the wall where the junction box will go is some insulation material wrapped in plastic.
Is it safe to have this immediately next to the junction box?
 
  #2  
Old 09-21-14, 12:43 PM
Tolyn Ironhand's Avatar
Group Moderator
Join Date: Nov 2007
Location: United States
Posts: 14,382
Received 892 Upvotes on 753 Posts
Yes. Junction boxes are installed in insulated walls all the time.
 
  #3  
Old 09-21-14, 02:22 PM
A
Member
Join Date: Mar 2014
Posts: 1,027
Received 169 Upvotes on 139 Posts
Just a note: if the wall will end up being finished with sheetrock you must be sure that the junction box is accessible without having to remove sheetrock (can't be hidden) you can put a blank plate over it so you can get to it after sheetrock goes up but don't hide it permanently.
 
  #4  
Old 09-21-14, 07:24 PM
Q
Member
Thread Starter
Join Date: Jun 2014
Location: Canada
Posts: 1,658
Received 1 Upvote on 1 Post
how safe are junction boxes?
They seem to have enough holes in them that if a fire started, it might catch.
I thought the whole poin was that they prevented this?
 
  #5  
Old 09-21-14, 07:40 PM
Tolyn Ironhand's Avatar
Group Moderator
Join Date: Nov 2007
Location: United States
Posts: 14,382
Received 892 Upvotes on 753 Posts
Yes, boxes are there to contain any sparks and heat that may be caused by a fault. However there is not too much that will burn in a box. Insulation is also treated with a fire retardant and is not easily started on fire.
 
  #6  
Old 09-21-14, 10:35 PM
pcboss's Avatar
Forum Topic Moderator
Join Date: Jul 2002
Location: Maryland
Posts: 13,985
Received 198 Upvotes on 173 Posts
The boxes have been tested for this usage with the holes and approved.
 
  #7  
Old 09-25-14, 10:23 AM
Q
Member
Thread Starter
Join Date: Jun 2014
Location: Canada
Posts: 1,658
Received 1 Upvote on 1 Post
I've noticed a couple junction boxes in the house where a mouse has tried to take some insulation material and in the process, dropped fine pieces into the junction box along with wood shavings etc.
I can clean these out once a year but I suspect the holes in the box cause part of the issue.
 
  #8  
Old 09-25-14, 02:44 PM
A
Member
Join Date: Mar 2014
Posts: 1,027
Received 169 Upvotes on 139 Posts
Be sure the junction boxes have covers and that any existing holes that are not being used are capped. You can buy them at a big box store. They are cheap and will keep the unwanted critters out. They just snap right in the holes.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: