A few years ago, a mate wanted to move his CU from the back of the house, to the front. He didn't want to pay the amount quoted by the DNO to move the meter outside, so he paid cash to a guy who was sacked by a DNO... for moving meters for cash at the weekends (they guy now makes a living moving meters for cash).
Anywho, he turned up, started cutting through the exterior braiding and then... put on PVC gauntlets. I asked him how he knew when it was time to replace the gloves, he said that he starts feeling a slight tingle. I also asked him what would happen if the the live and neutral were to touch- would it take out the whole block? He replied that depending on the distance from the distribution box, it would just keep making a banging noise (whilst they were still in contact) but that it might not affect anyone else's supply.
BTW, yes, it was illegal and in no way am I recommending that anyone goes down that path, but the fact remains that professionals working with live supplies do sometimes wear rubber gloves.
Anywho, he turned up, started cutting through the exterior braiding and then... put on PVC gauntlets. I asked him how he knew when it was time to replace the gloves, he said that he starts feeling a slight tingle. I also asked him what would happen if the the live and neutral were to touch- would it take out the whole block? He replied that depending on the distance from the distribution box, it would just keep making a banging noise (whilst they were still in contact) but that it might not affect anyone else's supply.
BTW, yes, it was illegal and in no way am I recommending that anyone goes down that path, but the fact remains that professionals working with live supplies do sometimes wear rubber gloves.