What kinda voltage are you getting on the fence? Just curious - none have mine have tried to fly out, not even broodies with babies or smaller hens that can fly. However, my fence is pretty durn 'hot' so they are scared to get near it.(14,400 volts when not wet).
I dunno, I'd have to look it up?
My husband tried to explain the science to me, but basically they need to be touching the ground to get zapped, and the Ameraucanas always fly AT the fence, and then climb up and over! Of course, now that its out, its on the wrong side and wants back in.
I joke that if they were any smarter they'd take over the world, some days I see them outside plotting, trying to figure out how to ring the doorbell and get me to come out and feed them, lol