ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
VDE 0100 to introduce AFCIs
by sparky. 01/20/18 05:09 PM
MRI LED lights dimmer control replacement - wow!
by Potseal. 01/19/18 08:52 PM
Video: Inventor of the GFCI self-testing shocks
by Bill Addiss. 01/17/18 11:11 PM
FPE in Germany
by HotLine1. 01/17/18 07:07 PM
Fujifilm Recalls Power Adapter Wall Plugs
by Admin. 01/16/18 07:04 PM
New in the Gallery:
Housebilding DIY wiring
SE cable question
Who's Online Now
0 registered members (), 3 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
12-3 question. #38830
06/03/04 04:39 PM
06/03/04 04:39 PM
G
ga.sparky56  Offline OP
Member
Joined: Nov 2002
Posts: 558
young harris georgia usa
Here's the problem. I have 2 3-way switches controlling a light. House is 3 yrs old,everything was fine until about a month ago. Customer complained that light would not turn off.

Went to check it and found the wiring arrangement to be correct,but upon taking the dead end 3 way out,I discovered that there was 120v between all three wires and ground.


Took both 3 ways out and also took the 3 wire out of the ckt.Ohmmeter says they're all in contact with each other somewhere.

My question is this,What could have happened to the cable to cause this? I did the work and remember running the cable myself. I'm always careful about stapleing,sharp edges,nail guarding etc. No work has been done in the house,or anything else done that would have come anywherenear the cable.

It worked for nearly 3 years. It's got me puzzled as to what happened.

Russell




[This message has been edited by ga.sparky56 (edited 06-03-2004).]

Work Gear for Electricians and the Trades
Re: 12-3 question. #38831
06/03/04 05:02 PM
06/03/04 05:02 PM
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,890
NY, USA
Russell,

I had this same problem once. After questioning the Customer when the light started staying on I found out that it happened the day someone put in an AC unit through the wall. One of the screws they put in went through the cable between the Live and 2 travellers and was not touching the bare ground.

Bill

Re: 12-3 question. #38832
06/03/04 05:16 PM
06/03/04 05:16 PM
E
earlydean  Offline
Member
Joined: Dec 2003
Posts: 751
Griswold, CT, USA
I had a similiar senario: Homeowner decided to panel his den using 4-inch tongue and groove strips. He ran out of nails. He used what he had in the garage, 4-inchers. Of course he ran one through the NM. I found it by checking every nail with my volt meter till I hit a hot one. They never tell you what they did, though. It is assumed to be your fault because you wired the sucker.

Earl


Earl
Re: 12-3 question. #38833
06/03/04 07:37 PM
06/03/04 07:37 PM
B
BigB  Offline
Member
Joined: Mar 2004
Posts: 721
Tucson, AZ USA
Ditto here. My customer hung planter boxes under the windows using 3 inch screws on the brackets.

Re: 12-3 question. #38834
06/03/04 08:54 PM
06/03/04 08:54 PM
G
ga.sparky56  Offline OP
Member
Joined: Nov 2002
Posts: 558
young harris georgia usa
Thanks for the input fellas.

The only thing I could think of was that is one of the switches is on the outside wall,and possibly a siding nail hit the wire.

I'll check closer for "improvements" when I go back.

Russell

Re: 12-3 question. #38835
06/04/04 12:09 AM
06/04/04 12:09 AM
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,890
NY, USA
Russ,

Ask them if they remember the Breaker tripping at all, and what was going on at the time.

It's worth a shot. In my situation the Breaker did trip when the guys were working, but then it did reset.

let us know how you make out.

Bill

Re: 12-3 question. #38836
06/05/04 07:10 AM
06/05/04 07:10 AM
G
ga.sparky56  Offline OP
Member
Joined: Nov 2002
Posts: 558
young harris georgia usa
Well, I wound up going in the attic a nd fishing a piece of 12-3 into both switches.

I couldn't find any evidence of anything that would have caused this to happen.

They say the breaker never tripped,nor could I get it to trip with the old 3-wire,but feeding any of the 3 insulated wires in the cable made them all hot.

It's fixed,but I still don't have a clue as to what could have happened that took 3 yrs to show up. [Linked Image]

Russell

Re: 12-3 question. #38837
06/05/04 10:42 AM
06/05/04 10:42 AM
C
CTwireman  Offline
Member
Joined: Feb 2002
Posts: 840
Connecticut, USA
I have gotten voltage across a 3-wire before due to induced voltage on a multiwire circuit (one phase deenergized), but never a full 120 volts. That is really strange.

Peter


Peter
Re: 12-3 question. #38838
06/05/04 01:02 PM
06/05/04 01:02 PM
D
DougW  Offline
Member
Joined: Jun 2003
Posts: 1,143
North Chicago, IL
WARNING - RAMPANT SILLINESS

Elvis...

When In doubt, blame "The King".


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
The_Lightman
The_Lightman
Orlando, Fl, USA
Posts: 49
Joined: August 2001
Show All Member Profiles 
Top Posters(30 Days)
Admin 20
sparky 16
Potseal 15
Popular Topics(Views)
243,573 Are you busy
180,372 Re: Forum
170,846 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.033s Queries: 14 (0.003s) Memory: 1.0000 MB (Peak: 1.1656 MB) Zlib enabled. Server Time: 2018-01-21 06:48:33 UTC