bud-- wrote:
On 10/16/2014 8:27 AM, Michael A. Terrell wrote:
wrote:
"As for the reset on the GFCI outlet, for most units your power has to
be on before it'll reset. "
I have found this not to be true. However, to test, it does require power.
Also, I stand corrected her or in the othe rgroup, that the ground is not even reqquired for the test button to work, originally I thought it was.
All of them I ever installed were properly grounded so whatever. I thought it took current to the ground for test. It does not, it simpley takes it to BEFORE the GF circuit and that causes the imbalance that makes it trip and prove itsel
The test button does nothing without a connection to ground. It
causes an imbalace between line and neutral by diverting a few mA to
ground form neutral.
The test button does not require a ground. The hot and neutral go
through a current transformer. The test button connects a resistor to
the hot ahead of the CT and the neutral downstream from the CT (or
vice-versa). Plug-in GFCI testes do not work without a ground.
I agree with everything else you have written here.
------------------------------
Interesting feature -
There is a second CT that tries to create a common-mode current on the
hot and neutral. If there is a plugged-in or downstream N-G connection
the GFCI trips.
Maybe you can explain this one-
A friend's apt has a ceiling fan in a room that trips the GFCI in the
bathroom if you exercise the fan speed or light switch fast enough.
They're on separate circuits as far as I can tell, but the wiring is old
and crappy to start with so I'm not even going to take off some covers to
look around.
I still have no idea how this happens. Anybody seen un-connected devices
trip a GFCI outlet?