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#95651 09/25/05 11:26 PM
Joined: Sep 2005
Posts: 99
T
Tripp Offline OP
Member
Last week at work we had a problem where the carpenter installing medicine cabinets sent a screw through one of our NM cables and caused a short. My apprentice suggested that in lieu of tearing into a lot of sheetrock to re-run the swichtleg to the vanity light, we could just cut into the rock in the one spot where the screw hit, splice the romex there and be done. He said that there was a "UL-approved" splicing device, approved for in-the-wall splices, and that he had personally used one of these devices in the past.

My reading of NEC 300.15 would expressly forbid such a practice and I have never before heard of such an "approved" device. Anyone else?

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#95652 09/25/05 11:54 PM
Joined: Mar 2002
Posts: 582
R
Ron Offline
Member
You are correct. He is not.


Ron
#95653 09/25/05 11:54 PM
Joined: Jul 2002
Posts: 717
M
Member
There has been talk of this on other posts (possibly I saw it at a different forum, I don't remember), I think the consensus was there is some device but it is not for conceiled work behind walls.

#95654 09/25/05 11:55 PM
Joined: Aug 2005
Posts: 89
D
Member
He is the apprentice, you are not.

#95655 09/25/05 11:58 PM
Joined: Sep 2005
Posts: 106
J
Member
Tyco Electronics makes a NM cable interconnection device that is designed to be concealed in the wall. Care needs to taken that there is no violation of the NEC.

For more information on these devices see the following sections of the 2005 NEC.
545.13, 550.15(K), 551.47(O), 552.48(N) and 690.32. These are the only places in the 2005 NEC that permits the interconnection device. For more information see UL file number E57250.
[Linked Image]


Mike
#95656 09/26/05 02:55 AM
Joined: Jan 2003
Posts: 4,391
I
Moderator
I agree with Mike (JW) here, a few companies now make a listed in the wall splice for NM.

I suggest a look at 334.40(B) [Linked Image]

You may not have been able to use these for the repair though.

Bob

[This message has been edited by iwire (edited 09-26-2005).]


Bob Badger
Construction & Maintenance Electrician
Massachusetts
#95657 09/26/05 09:34 AM
Joined: Apr 2005
Posts: 73
D
Member
Iwire Just curious. Why would you want to fish a splice into a wall? 334.40B state you can do this during rewiring in existing buildings where the cable is concealed and fished.

#95658 09/26/05 12:11 PM
Joined: Sep 2005
Posts: 106
J
Member
Quote
I suggest a look at 334.40(B) [Linked Image]

Thank you Bob I missed the most important one

[Linked Image]


Mike

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