Insulating Around Electrical - Electrical - DIY Chatroom Home Improvement Forum
Advertisement


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools
Display Modes
Old 07-18-2010, 03:55 PM   #1
Newbie
 
Join Date: Oct 2009
Posts: 19
Rewards Points: 10
Default

Insulating Around Electrical


Hey everyone-

I have an older house- I'm remodeling the foyer. I know you cannot put fiberglass insulation around knob and tube wiring. Here's a picture of the type of wiring I have- doesn't appear to be K&T but not modern either. Can anyone say what type is it and is it safe to insulate around?

Pic:
http://i746.photobucket.com/albums/x...b/DSC00112.jpg

Thanks!
-Greg
c00rdb is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 07-18-2010, 04:00 PM   #2
Electrician
 
Proby's Avatar
 
Join Date: Jul 2010
Location: NJ
Posts: 818
Rewards Points: 500
Default


While the walls are open, why not upgrade to some newer romex?
Proby is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 07-18-2010, 04:19 PM   #3
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Rewards Points: 2,000
Default


If you don't upgrade, you will be using heat shrink tubing to piecemeal replace your crumbling and brittle insulation on the wires.

For the thermal part, these equations
http://www.electrician2.com/ampacity.htm
can, in principle, be waded through.

Last edited by Yoyizit; 07-18-2010 at 04:39 PM.
Yoyizit is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 07-18-2010, 08:34 PM   #4
Licensed Electrical Cont.
 
Speedy Petey's Avatar
 
Join Date: Feb 2004
Location: NY State
Posts: 7,828
Rewards Points: 2,006
Default


Yes, without having to wade through equations and formulas, you CAN insulate around that cable.....if you really want to.
Personally I would also replace ANY of that stuff if the walls were open.
Speedy Petey is offline   Reply With Quote
Old 07-18-2010, 09:34 PM   #5
nap
You talking to me?
 
nap's Avatar
 
Join Date: Dec 2007
Location: sw mi
Posts: 7,551
Rewards Points: 6,290
Default


Quote:
Originally Posted by c00rdb View Post
doesn't appear to be K&T but not modern either. Can anyone say what type is it and is it safe to insulate around?g
that's just older style NM (Romex). Totally safe to insulate around it.
nap is offline   Reply With Quote
Old 07-18-2010, 10:54 PM   #6
" Euro " electrician
 
frenchelectrican's Avatar
 
Join Date: Apr 2006
Location: WI & France { in France for now }
Posts: 5,369
Rewards Points: 2,000
Default


That is older style of NM cable but as long the wall is open I think I really suggest ya to run new cables as need to to bring it up the code due the older style NM most case they do not have grounding conductor at all.

And with walls open you can able install new recepales and swtiches and luminaire junction box as well { if you going to install the ceiling fan it will be wise to install the proper juction box that rated with ceiling fan useage }

Merci.
Marc
frenchelectrican is offline   Reply With Quote
Old 07-19-2010, 07:18 AM   #7
Newbie
 
Join Date: Jun 2010
Location: Pennsylvania
Posts: 24
Rewards Points: 10
Default


If it were me I would definitely replace that old stuff. It looks like it wasn't installed right in the first place. Notice how the wire on the right is dangling out of the hole? There does not appear to be a proper clamp in the box. Abrasion of wire to metal could cause the box to become hot and electrocute someone since the old wire has no ground.
SleepyDog is offline   Reply With Quote
Old 07-19-2010, 09:07 AM   #8
Electrician
 
Proby's Avatar
 
Join Date: Jul 2010
Location: NJ
Posts: 818
Rewards Points: 500
Default


FWIW, some of that old Romex does have a small EGC in it. In my home they would pull the small wire back out of the box and attach it to a screw on the outside of the box, for some strange reason.
Proby is offline   Reply With Quote
Old 07-19-2010, 09:32 AM   #9
Member
 
47_47's Avatar
 
Join Date: Sep 2007
Location: Springville, NY
Posts: 2,585
Rewards Points: 320
Default


Quote:
Originally Posted by Proby View Post
In my home they would pull the small wire back out of the box and attach it to a screw on the outside of the box, for some strange reason.
They did this at my home also. The only reason that I can come up with is the metal boxes that they used are very shallow. Also the ground wire is smaller than the rest of the wires on the older NM. I'll pile on and say replace it.
47_47 is offline   Reply With Quote
Old 07-19-2010, 10:35 AM   #10
Electrician
 
Proby's Avatar
 
Join Date: Jul 2010
Location: NJ
Posts: 818
Rewards Points: 500
Default


Quote:
Originally Posted by 47_47 View Post
They did this at my home also. The only reason that I can come up with is the metal boxes that they used are very shallow. Also the ground wire is smaller than the rest of the wires on the older NM. I'll pile on and say replace it.
Nice, at least I'm not the only one!

One thing they did that makes it worse is that they put the ground wires under a screw towards the front of the box, so that screw protrudes into the box. That's fine with normal devices, but when you go to put a GFCI, Dimmer, Timer, etc. in they won't fit because the screw is there. So now I have to try and sawzall the end of the screw off without shaking the box too much and cracking the plaster
Proby is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Changing from Electrical Cook Top to Electrical Range EkS Electrical 24 06-22-2010 10:43 AM
How to install new electrical box without attic access gilmores33 Electrical 10 02-14-2010 07:46 PM
Slight electrical current in bathroom faucet water + other unusual electrical events story Electrical 9 09-16-2009 10:28 PM
Insulating brick above & close to grade Peter Shepherd Building & Construction 1 09-16-2009 06:41 AM
Electrical box replace,addiitions, city permits and looking for an electrician ramchy Electrical 3 08-02-2009 11:12 AM




Top of Page | View New Posts