[The Old Guy]

GStream40,
Ron, I have worked in the construction industry since way before GFI's and have worked with and installed them myself. They are extremly sensitive and necessarily so. Radio frequencies are quite strong, some more so than others. That is why there used to be, and probably still are, signs telling us to turn off two way radios near blasting sites. It is also why hospitals and airlines ask us not to use cell phones as they can interfere with delicate electrical equipment. (most hospitals now realize that there is little concern over cell phones anymore.)

That is probably why an RF signal can trip a GFI if close enough. I was testing my new automatic transfer switch at the storage compound a few days ago and just the switching triggered the GFI that supplies low amp service to the unit. We stay "plugged in" to keep the batteries charged.

Curious if Bob agrees with me.

Ralph