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

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 08-15-2006, 11:38 AM   #1
Member
 
Join Date: Mar 2006
Posts: 46
Rewards Points: 0
Share |
Default

Would this be in the gray area of the NEC?


Im planning my sub panel install for my garage im bulding. I know I cant run NM-B with Insulation thru conduit. Running conduit all the way from my main breaker box out to the corner where i need to go thru the wall would be tough.

So i was gonna run 6-3 W G NM-B (Romex) out to the corner in the basement and into a juntion box, where the Schd 40 PVC would start, and just strip the insulation of the nm-b and pull the single wires thru the conduit to the sub panel in the garage.

Would this be ok? The single wires within the NM-B cable are THHN, but they dont have the clear plastic covering as well as the outer jacket like true THHN has.

Otherwise, I guess I would have to splice over to single THHN in the junction box, and pull them out to the Sub. I was just trying to make it easier and use the one cable and no splices.

Thanks in advance.....


Last edited by stagger19; 08-15-2006 at 12:01 PM.
stagger19 is offline   Reply With Quote
Old 08-15-2006, 12:52 PM   #2
Member
 
Join Date: Mar 2006
Posts: 682
Rewards Points: 0
Default

Would this be in the gray area of the NEC?


WOW! you sure did hit a grey area, and I have read posts on forums on both sides of the issue about stripping the outer sheath from the nm cable and what the new rating is. IMHO it is not a bad thing to do, but I doubt that the mfg would give your new product any kind of rating. (probably for insurance purposes)

However, in your case it would not be acceptable. You need a THWN rating. Most makers of individual strand wire produce them with a duel rating of THHN/THWN and to be more presise they carry a couple more ratings.

The W in THWN stands for water, and all underground installations in conduit or not, need to have this rating. Electrical conduits will fill with water.

Nice try. I suggest you use the splices at the J box that you mentioned.

jwhite is offline   Reply With Quote
Old 08-15-2006, 01:25 PM   #3
Member
 
Join Date: Mar 2006
Posts: 46
Rewards Points: 0
Default

Would this be in the gray area of the NEC?


I didnt know conduit would fill with water. Is that thru the connection leaking or condensation building up in there?




[quote=The W in THWN stands for water, and all underground installations in conduit or not, need to have this rating. Electrical conduits will fill with water.
stagger19 is offline   Reply With Quote
Old 08-15-2006, 01:36 PM   #4
Member
 
Join Date: Mar 2006
Posts: 682
Rewards Points: 0
Default

Would this be in the gray area of the NEC?


Quote:
Originally Posted by stagger19
I didnt know conduit would fill with water. Is that thru the connection leaking or condensation building up in there?
Mostly through condensation as electricians try to do thier best, but the materails are not designed to keep water out. The code requires underground wire be water rated, so the conduit does not need to be designed any other way.
jwhite is offline   Reply With Quote
Old 08-15-2006, 02:48 PM   #5
Newbie
 
Join Date: Aug 2006
Posts: 5
Rewards Points: 0
Default

Would this be in the gray area of the NEC?


Natrulaly you will get water in conduit because of the temperature difference from above ground and below. This causes condensation over and over again thus filling the pipe.
wirenut is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Mult-purpose living area decorating shapeshifter Interior Decorating 19 07-07-2007 08:57 PM
incloseing this area clasact Building & Construction 2 06-29-2007 10:20 PM
What to do with area about tub surround? geowoman Remodeling 7 05-05-2007 01:56 PM
prefinished flooring dulling in high traffic area. yummy mummy Flooring 4 12-19-2006 09:40 PM
help Chuckman Off Topic 8 06-15-2006 10:06 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.