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Old 02-08-2010, 09:08 AM   #1
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extending an outlet


First sorry if this has been asked before.I will be installing insulation in my exterior walls and thus making the walls thicker.I will need to move the outlets inwards.The wires/bx cannot be pulled out enough to reach the new wall,4 inches.I want to add a section of bx with connector to the old box,make the connections with wire nuts then run the short section of bx to the new wall/box and add my outlets.I will then add the metal cover to the old box,in essence making it a junction box. Here's the thing,this junction box will now be hidden in the wall.Is this a code violation? Is this ok to do?All connections will be made with correct wire dia.,bx cable holders in both boxes,and correct wire nuts.It will be a MAJOR job to run new wires all the way to the panel.All comments welcomed.

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Old 02-08-2010, 09:10 AM   #2
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extending an outlet


You cannot have a splice hidden in a wall. It has to be accessible.

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Old 02-08-2010, 09:10 AM   #3
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extending an outlet


You can not bury a junction box inside a wall. It must remain accessible. You could just add box extenders to the existing boxes to bring them out to new wall surface.
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Old 02-08-2010, 09:22 AM   #4
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extending an outlet


Never heard of box extenders.Will they extend 4 inches? Guess I need to do a search for a pic.
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Old 02-08-2010, 09:31 AM   #5
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extending an outlet


So I just looked up box extenders.I don't think the wires will pull out enough to use these.Does this mean I have to run new wires all the way back to the panel?
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Old 02-08-2010, 09:46 AM   #6
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extending an outlet


Can't you just splice the old wire to a short length of new wire inside the box/extender?
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Old 02-08-2010, 09:57 AM   #7
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How would that be different from what I was thinking of doing? It's still a splice.
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Old 02-08-2010, 10:37 AM   #8
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extending an outlet


You can't have a hidden box in the wall w/splices
That is a code violation & one Inspectors & Electricians hate
All splices must be accessible

You need a box extender that will reach all the way back to the old box
You can't put a new box in front of the old box - you need an open back "box" so access to the old box is thru the new area/cover

Is the old box metal & will the new box be metal ?
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Old 02-08-2010, 10:49 AM   #9
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How would that be different from what I was thinking of doing? It's still a splice.
The box extender has no back on it, like Dave said. So the splice would still be accessible through the front cover plate on the extender.

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Old 02-08-2010, 11:05 AM   #10
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extending an outlet


How about removing the boxes and lowering them down so you can move them out to the face of the new wall?

Have you thought about spray in insulation in the old walls?

If that splice fails that is 4" back in the old box there is no way you will be able to access it even if you installed an extension.
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Old 02-08-2010, 11:07 AM   #11
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extending an outlet


Can he install two (or more) box extenders, one behind another?
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Old 02-08-2010, 11:08 AM   #12
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Quote:
Originally Posted by Jim Port View Post
How about removing the boxes and lowering them down so you can move them out to the face of the new wall?

Have you thought about spray in insulation in the old walls?

If that splice fails that is 4" back in the old box there is no way you will be able to access it even if you installed an extension.
Best way. Raise or lower depending how the cable feeds the boxes.
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Old 02-08-2010, 11:23 AM   #13
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Yeah, I'd try to lower or raise the box
Do you have a crawl space or (finished) basement ?
I've put a junction box in the basement before & run new wire from there to the new box

I prefer to have splices easily accessible
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Old 02-08-2010, 02:47 PM   #14
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Quote:
Originally Posted by Scuba_Dave View Post
You can't have a hidden box in the wall w/splices
That is a code violation & one Inspectors & Electricians hate
All splices must be accessible

You need a box extender that will reach all the way back to the old box
You can't put a new box in front of the old box - you need an open back "box" so access to the old box is thru the new area/cover

Is the old box metal & will the new box be metal ?
The old box is metal,so maybe the new box should be metal?The wires are 12/2 bx so do I just use 12g wire with the correct colors,white and black or do I need to use bx?
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Old 02-08-2010, 02:51 PM   #15
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extending an outlet


Quote:
Originally Posted by Jim Port View Post
How about removing the boxes and lowering them down so you can move them out to the face of the new wall?

Have you thought about spray in insulation in the old walls?

If that splice fails that is 4" back in the old box there is no way you will be able to access it even if you installed an extension.
Spray insulation not and option.haven't demo the wall yet.Getting all my info here first.Will look into lowering them,but it looks tight.

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