no GFI age,maker or model told... (some have evolved.)
as do some on other countries, NONE TOLD so, generic answers you WIN>? (gin)
no, only it and the drownstream jacks.(if wired as gfi extensions)
or if the home as a bad green wire ground sure.
call and electrician and fix it.
or test all things on the circuit 1 by one on the main GFI outlet
see what appliance trips it 1 by one, all other not connect.
easy no? IDK what you have there so , can only say simple tests.
on good circuits, ground and neutral most not go to differential volts.
some gfi can tip if 2 thing fault
if normal line current is exceed on neutral line it trip\
think water in a hand hair dryer ,oops
and some can see green wire leakage too and is not allowed./
if the energy used by the load is the same as the outlet power input
that is good , if not , it fails. (means and ******* power leaks is present and super dangerous to humans or even pets)
I like this drawing (amazing quality ) here.
https://www.westernautomation.com/wp-content/uploads/2016/03/GFCIs_For_AC_DC_Systems.pdf
in my USA home my 200AMP load center is huge jumpered
Neutral to earth ground and again at the curb transformer.
and my 2 deep 16ft ground stakes and one more on a huge ANTENNA.base, and all are cross tied, I take grounds serious.
so if earth ground is bad. that a
first order never ignore error.
fully unsafe.
earth ground keeps my washing machine safe.as will GFI , and double safe.
also GFI breakers too are sold and even better.
the beauty of it , it trips if line leakage to human body is to neural or to earth ground (bare feet in puddle of water ) both.
is uses an Imbalance ,detector to do that, lives saved is huge.
best is as electrician to do a ground load test.
this test assures ground and neutral have tight and good bond.
nice schematic no> super simple to see now it works.
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