Electric fencers are great fun with naughty horses and goats ! Oh and kids who grab their dads hand and say”dad I want to show you something “ and grab the electric fence giving their dad a huge lifter haha
For electric fencers, they can be plugged into a GFI, but if the GFI is tripped then yes the fencer is down.
What I did is put the fencer inside the barn (as mine isn’t weather proof), I used insulated wire inside the barn running from the fencer and out to the actual fence and grounding rod (which was 8’ in the ground).
At the actual fence I connected the insulated wire to the actual electric fence wire - I have used wire, tape, and twine. I much preferred the twine as it breaks if the horses tangle in it, and I have seen horrific injuries from wire and tape which don’t break.
What I plan with my chicken run, is to run three strands of twine on the outside of the run, the first strand at about 8” to 10” off the ground and then at 1’ increments up the run fence. To keep raccoons and foxes, etc out.
An easy way to keep the fencer from grounding on weeds and grass, is to spray the fence line with Round-up to kill the vegetation. Use this in the evening after bees and other pollinators have retired for the day.
Happy zapping!