Quote:
Originally Posted by TonyDuell
I was taught 'All wires are live until _you personally_ have proved they are not' I would never joke about isolating a circuit, but if you are working with me, I would not be insulted if you verified that. In fact I would expect it. Similarly I would hope you would not be insulted if I check the wires were dead. Anyone can make a mistake...
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Standard procedure is to isolate the mains and lock off. In front of the person who is going to do the work test the tester with the proving unit. Test all phases and neutral with respect to one another and then with respect to earth. Again, check the tester with the proving unit and hand the person doing the job the lock off keys. If the person doing the work wants to double check that's fine.