GFCI Trips via Motorola CP200 Two-Way Radio??

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George Stolz

Staff member
Windsor, CO NEC: 2017
Service Manager

Well, I guess that answers my little question of why my GFCI's would trip inexplicably in the kitchen awhile back, and it's stopped now - I turned in my Nextel over a year ago, and even when the charger was not plugged into the GFCI (plugged in on the line side of it) it would still occasionally trip, I had removed the phone from the troubleshooting equation.

I hadn't had a trip in a long time, and had forgotten about it. I never knew a radio could trip a GFCI. :cool:


Senior Member
tom baker said:
The UL Standard is ANSI/UL 943 go here for more information.
The RF update may of been in 2003. This doesn't mention it.
Thanks Tom,
Now if I only had $400-800 to purchase that Standard :)

I would be interested to know the EMC standard that UL943 references. I have access to the EN61000-4-3 standards. If one knew the volts/meter they test the GFCIs to then you could estimate how far away a given radio (at a given power level) would need to be kept from the GFCI wiring to prevent a false trip.
I have no direct experience with cell phones but they are typically a much lower power level that the type of radios that would cause GFCIs to trip. Not that they couldn't, just have not heard of it. Chargers often put a lot of noise onto the electrical lines and so conducted noise could also come into play and would not necessarily need to be downstream of the GFCI.
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