I thought I had a reasonable understancing of GFCI devices.
My first problems were when I was using GFCI for protection in a
hydroponic greenhouse. There was a lot of plant nutrient which was
essentially salt water. I had immersible pumps in the solution that were
on a timer. They tended to trip when the timer turned the pumps off.
These used pumps with a separate ground wire.
I rationalized that the inductive kick somehow led to leakage to ground.
By placing a capacitor between hot and neutral, was able to get rid of
the unwanted trips.
More recently, I was using a Water Pik in the bathroom. It used a two
wire connection with no separate grounding conductor. GFCI should still
work well. There never was tripping when I turned the device off. When I
remove the plug from the wall socket with device switched off was when I
would get occasional trips. I rationalized that in the bathroom
environment there may have been just enough surface moisture to connect
to my hand.
Today was different. I turned off the Water Pik. My hands were
relatively dry. I grabbed the plug as far away from the socket as I
could while getting a firm grip on the plug structure so as not to put a
strain on the wires. When I disconnected the plug, I got a trip AFTER
the plug was disconnected. I guess that the time delay between the time
I saw the plug's prongs and the click was about 1/5 of a second.
Does anyone here have reasonable scenarios for what happened?
10 years ago