insulation behind junction box?

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  #1  
Old 09-21-14, 01:25 PM
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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?
 
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Old 09-21-14, 01:43 PM
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Yes. Junction boxes are installed in insulated walls all the time.
 
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Old 09-21-14, 03:22 PM
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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.
 
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Old 09-21-14, 08:24 PM
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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?
 
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Old 09-21-14, 08:40 PM
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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.
 
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Old 09-21-14, 11:35 PM
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The boxes have been tested for this usage with the holes and approved.
 
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Old 09-25-14, 11:23 AM
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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.
 
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Old 09-25-14, 03:44 PM
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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.
 
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