As others have said, I definitely wouldn't use electric poultry netting for sheep.
When we first moved here, we had a batch of hubbard chickens behind poultry netting (not electrified, thankfully) in our smallest field, and let the other fields to our neighbour for his sheep.
Unfortunately our fencing wasn't the best, and I twice had to cut sheep out of the mesh after they broke through the fence and then got tangled up in the netting. These were blackface sheep, and their horns did seem to be the main problem. However, the same thing could easily happen with a button eartag for instance. Also once caught, they tended to twist round and get more and more entangled.
In our case, the sheep were unharmed (I wish I could say the same for the netting). However, it could have been far worse.