An isolator switch sounds like an excellent idea.
I once replaced a CU, but fortunately for me the tails from the meter were already wired into a service connector block, so although when I connected the new CU up I was working on a hot circuit, I wasn't having to deal with live tails flailing around - all I had to do was carefully ( VERY CAREFULLY ) insert cables into solidly fixed and immovable metal bars.
Was it legal? If the equivalent of 25 (1) quoted by Breezer was in force 16 years ago, then no.
Was it safe? Safe enough, I think - I used properly insulated tools, and at no time did I have any loose wires that were live.
Did my palms sweat? A little, but not enough to make the tools slippery
Would I do it again? Dunno. There's a lot of truth in the saying that it's easier to ask forgiveness than permission. If I ask my supplier to disconnect me so that I can change my CU, and he demands all sorts of fees and inspections, or requires that I pay my nearest Breezer to do it, and I decide "stuff it, I'll do it myself" what then? But if I just do it, my chances of getting caught are vanishingly small (provided I don't blow the main fuse
).
Would I do what Dingbat seems to be contemplating, which is to remove a live tail from a CU and have it dangle live whilst I replaced the CU? I'd feel very uncomfortable with that.
You see I
know that I can wire up a CU safely. Or rewire a house if it comes to that. I
know that I'm not a qualified electrician, and that I don't have the skills to attempt anything beyond domestic ring mains and lights etc. The regulations
know (as is evinced by some of the posts to this forum) that some people don't even understand how to wire up a 2-way light switch.
So where do you draw the line? I'd hate to see us end up like the States, where you can't even install new sockets yourself (bet Breezer would though
).
Maybe next time I should install my own isolator - I'd have the same, one, safe-enough operation to introduce the end of a wire into a live connection box, but once that was done I'd never have to do it again.