On more than one occasion I have had a sinking feeling upon realising I have tested a circuit L-N at 500V and not isolated the boiler circuit. On only one occasion did I do some damage and that was to blow a 1A glass fuse on the PCB board.
Tested live & neutral connected together and that connection tested to earth. On circuits previously working fine (i.e. no live - earth reversal) that should not cause a problem, esp at 250 volts.
For heavens sake! He is not wiring the Channel Tunnel! It's simply a BOARD change in a domestic property - hardly rocket science. Most people of average intelligence and a basic knowledge of electrics from even a Reader's Digest or Collins DIY book would be able to wire a house and probably do...
All the information I have posted links to is freely accessible from reputable sources: Radio 4, Mirror and, one supposes, O'Mahoneys own entry to Linked in.
Mirror - I don't think it has anything to do with the Daily Mirror.
New Info
Andrew Penman and Nick Sommerlad form the Daily Mirror's...
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