Sorry to disagree !
I read in the paper that he asked for the electricity to be turned off. He then used a broom handle to dislodge the trolley and test the track. If he had any doubt that the electricity hadnt been turned off, he should not have been on the track.If he had been electrocuted, whom was to blame ?
H&S rules are there to guard from "common sense" which is not enough in most situations.
Because of his good intentions, he should not have been sacked
Hugh