ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
sparky 5
Recent Posts
Permit Snafus...AHJs and Contractors Jump in
by sparky. 04/29/17 05:59 PM
201 volt equipment?
by bigpapa. 04/29/17 12:15 AM
Schneider LC1D09
by jraef. 04/28/17 11:05 PM
Electrode boilers question
by annemarie1. 04/27/17 01:40 PM
Why cables look like they do
by LongRunner. 04/26/17 09:36 AM
New in the Gallery:
SE cable question
Popular Topics(Views)
234,952 Are you busy
169,778 Re: Forum
162,994 Need opinion
Who's Online Now
0 registered members (), 66 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#38830 - 06/03/04 05:39 PM 12-3 question.  
ga.sparky56  Offline
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

#38831 - 06/03/04 06:02 PM Re: 12-3 question.  
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,878
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


#38832 - 06/03/04 06:16 PM Re: 12-3 question.  
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

#38833 - 06/03/04 08:37 PM Re: 12-3 question.  
BigB  Offline
Member
Joined: Mar 2004
Posts: 719
Tucson, AZ USA
Ditto here. My customer hung planter boxes under the windows using 3 inch screws on the brackets.


#38834 - 06/03/04 09:54 PM Re: 12-3 question.  
ga.sparky56  Offline
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


#38835 - 06/04/04 01:09 AM Re: 12-3 question.  
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,878
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


#38836 - 06/05/04 08:10 AM Re: 12-3 question.  
ga.sparky56  Offline
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


#38837 - 06/05/04 11:42 AM Re: 12-3 question.  
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

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

Elvis...

When In doubt, blame "The King".



Member Spotlight
togol
togol
NW In. USA
Posts: 421
Joined: September 2005
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.015s Queries: 14 (0.002s) Memory: 0.8004 MB (Peak: 0.9645 MB) Zlib enabled. Server Time: 2017-04-29 23:27:18 UTC