ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
dsk 13
Admin 8
doc 3
Recent Posts
Bathroom electrical
by doc. 08/19/17 06:53 AM
electircal ageing test on IPC
by SIAME. 08/15/17 02:43 AM
electrical aging test on IPC
by gfretwell. 08/15/17 12:27 AM
"Line level" audio on Cat 5?
by gfretwell. 08/08/17 10:39 PM
Fire alarm phone lines and color coding
by gfretwell. 08/08/17 10:26 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
240,021 Are you busy
175,628 Re: Forum
167,863 Need opinion
Who's Online Now
0 registered members (), 61 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#61529 - 01/26/06 10:23 PM current leakage  
BigB  Offline
Member
Joined: Mar 2004
Posts: 719
Tucson, AZ USA
Just came from an interesting service call. It was a halfway house for veterans that I have worked at before. They have a number of duplex units built in the 50's, no equipment grounds at any receptacles.

Anyway a resident complained of shocks received off the refrig. When I got there they described the shocks as a snap accompianied by a blue spark. They get them whenever they touch anything metal and also the phone and the thermostat. Well I told them it was static electricity, but I would check the fridge anyway.

Well when the fridge is running, it will light my non contact tester when held close to the cabinet. So I got my analog meter and checked from a part of the fridge that was not painted to the grounded gas line nearby. I got about 13 volts. Remember this fridge has no equipment ground with the old 2 wire system.

So now I am thinking, in addition to the static shocks, they could've gotten a real current shock off the fridge. Is the 13 volts excessive? As soon as the fridge shuts off it goes away. I told them, short of running a new circuit, the only thing to do is get a new fridge. I know if I put in a GFCI it will not hold.
I know the code requires refrigerators to be grounded, but if they can't pay for a new circuit, what else is there to do?


Work Gear for Electricians and the Trades

#61530 - 01/27/06 12:33 AM Re: current leakage  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,103
Estero,Fl,usa
You are seeing the real reason refrigerators trip GFCIs. You have a short inside the compressor. If it was grounded it would quietly arc and spark inside the can in a freon bath until it finally quits.


Greg Fretwell

#61531 - 01/27/06 03:32 AM Re: current leakage  
Sixer  Offline
Member
Joined: Aug 2005
Posts: 265
Canada
I've run into "hot fridges" many times. Once you ground the fridge, the casing will no longer be hot. Thanks for the explanation gfretwell....I've always wondered how a compressor can have a short and energize the casing, and yet when you ground it, it not only solves the problem but the breaker doesn't trip.


Sixer

"Will it be cheaper if I drill the holes for you?"


Member Spotlight
Radar
Radar
Los Angeles, CA
Posts: 349
Joined: April 2004
Show All Member Profiles 
Featured:

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

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.010s Queries: 14 (0.002s) Memory: 0.7528 MB (Peak: 0.8737 MB) Zlib enabled. Server Time: 2017-08-21 10:10:14 UTC