For a simple reduction,
Let's say there is an Eruv with an electrical pole-fishing line barrier and one of the electrical poles need to be serviced. Can one of those electrical poles be replaced by a non-Jew with the fishing line attached in a similar fashion?
Does it matter if the electrical pole doesn't move at all? Does it matter if the electrical pole moves 10 feet? Is utility maintenance of this sort simple?
I see this in the FAQ, but no further explaination,
Sometimes things break all by themselves, sometimes cars or trucks knock down poles, and occasionally the owner of the pole will replace it with one a few feet away and the new one doesn’t work for us.