ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Tingle off the water spigot
by dsk. 10/15/18 02:36 PM
Board tester power supply?
by JoeTestingEngr. 10/13/18 12:14 AM
Voltage sag
by Trumpy. 10/12/18 06:59 PM
220/230/240V 60Hz Systems
by Trumpy. 10/12/18 06:50 PM
Linear Power Supply Quits Under Load
by JoeTestingEngr. 10/10/18 08:47 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 7 guests, and 29 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
Two way radio trips GFCI #66694
06/14/06 09:21 PM
06/14/06 09:21 PM
D
drillman  Offline OP
Member
Joined: Mar 2003
Posts: 97
Somewhere in Texas
A coworker showed me this today.

There was a GFCI in a bathroom and when he keyed his radio it tripped the GFCI. He reset it and did it again.

Nothing plugged into the GFCI.

This is a new one on me.

Can anyone explain this?

Thanks

Work Gear for Electricians and the Trades
Re: Two way radio trips GFCI #66695
06/14/06 09:33 PM
06/14/06 09:33 PM
N
NJwirenut  Offline
Member
Joined: Sep 2001
Posts: 806
Bergen County, NJ
The RF signal from the transmitter is getting picked up by the wiring, and is being interpreted by the GFCI as a current imbalance.

A different make of GFCI might fix the problem. El Cheapo GFCIs often omit "needless" filtering components like bypass capacitors. RF pickup can be a problem with cheap residential wiring materials (romex and plastic boxes), which provide no RF shielding compared to AC/MC cable or conduit and metal boxes.

Re: Two way radio trips GFCI #66696
06/14/06 09:33 PM
06/14/06 09:33 PM
Trumpy  Offline

Member
Joined: Jul 2002
Posts: 8,250
SI,New Zealand
It's caused by the RF currents from the 2-way radio transmitter.
It induces a current in the GFCI sensor coil, tripping the internal relay.

{Oops, we must have posted at the same time Kenny} [Linked Image]

[This message has been edited by Trumpy (edited 06-14-2006).]

Re: Two way radio trips GFCI #66697
06/14/06 10:10 PM
06/14/06 10:10 PM
J
JCooper  Offline
Member
Joined: Dec 2002
Posts: 228
Kendall Park, NJ USA
In the town I am a firefighter in we had the same problem in a new apartment complex that was being built, but when we keyed up on one channel the gfi would pop and let its smoke out. It then was dead, could not be reset. The GC ended up replacing most of the gfci's in the complex.

Re: Two way radio trips GFCI #66698
06/15/06 02:25 AM
06/15/06 02:25 AM
E
e57  Offline
Member
Joined: May 2003
Posts: 2,876
S.F.,CA USA
Imagine what it does when you talk into it....


Mark Heller
"Well - I oughta....." -Jackie Gleason
Re: Two way radio trips GFCI #66699
06/15/06 09:21 AM
06/15/06 09:21 AM
M
Mike Wescoatt  Offline
Member
Joined: Jun 2001
Posts: 161
Cedar City, Utah
We had a system setup to feed power to within the 12' vertical area above a pool so we installed a bunch of GFCI's in a Hoffman box. Our radios would trip all at once. We traded out one of the boxes for a RFI shielded box and they still tripped, presumably from the unshielded wiring that left the box. Our fix was to post a sign not to key radio within 5' of the box.

The guys were wondering if the "radio key" method meets the OSHA GFCI testing requirements. It was easier than testing hundreds of GFCI's each month... (Still had them test by the pushbutton)


Mike Wescoatt
Re: Two way radio trips GFCI #66700
06/15/06 05:07 PM
06/15/06 05:07 PM
C
Celtic  Offline
Member
Joined: Feb 2005
Posts: 361
NJ
[quote]The guys were wondering if the "radio key" method meets the OSHA GFCI testing requirements. It was easier than testing hundreds of GFCI's each month... (Still had them test by the pushbutton)[/quote

...but then who resets them all?

[Linked Image]


~~ CELTIC ~~
...-= NJ =-...
Re: Two way radio trips GFCI #66701
06/15/06 06:30 PM
06/15/06 06:30 PM
R
Roger  Offline
Member
Joined: May 2002
Posts: 1,716
N.C.
If only a device was on the market that when keyed would kill all cell phones in a 1000 sq ft area.

I would buy one. [Linked Image]

Roger

Re: Two way radio trips GFCI #66702
06/15/06 07:34 PM
06/15/06 07:34 PM
R
Rewired  Offline
Member
Joined: Jan 2006
Posts: 558
Hamilton, Ontario, Canada
Try keying your radio beside your computer monitor or near a regular am / fm radio and see what it does mine throws the screen all crazy and maked the radio emit some funny sounds... I am going to try keying up near a GFI just for " Ha Ha's" amd see what happens...

Roger: if such a device were availible ( or buildable) you would see me with one too!

A.D

Re: Two way radio trips GFCI #66703
06/15/06 07:47 PM
06/15/06 07:47 PM
E
e57  Offline
Member
Joined: May 2003
Posts: 2,876
S.F.,CA USA
Gent's they are available, and were slated to be installed in movie theaters until the lawyers of the phone companies got involved. They are currently in use in Iraq..... (To thwart remote bombs)
http://www.cellantenna.com/CJAM/cjam_1000.htm


Mark Heller
"Well - I oughta....." -Jackie Gleason
Page 1 of 2 1 2

Featured:

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

 

Member Spotlight
NickD
NickD
Amish Country, PA
Posts: 46
Joined: March 2013
Show All Member Profiles 
Top Posters(30 Days)
sparky 11
Trumpy 3
Popular Topics(Views)
250,279 Are you busy
187,921 Re: Forum
177,456 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.026s Queries: 15 (0.003s) Memory: 1.0253 MB (Peak: 1.2027 MB) Zlib enabled. Server Time: 2018-10-16 06:37:20 UTC