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Christian McArdle
 
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Why do you reckon that then Christian?...

Because you won't get a shock from an isolated piece of metal, even with you
other hand clamped firmly on a live conductor. If the metal is earthed, you
have a low impedence path to earth. The RCD might save you if the live
conductor happens to be connected via an RCD. If not, you're toast. The 32A
MCB will require 160A to guarantee disconnection, which is not going to
happen!

The IEE agree. Even in bathrooms they advise not to bond metal baths or
radiators if all supplies and wastes are plastic and the item is not in
contact with structural metalwork. Indeed, they strongly recommend
connecting using plastic pipework so that you can take advantage of the
additional safety thereby provided.

Christian.