earth bonding (sigh)

Indeed. If the electrician is claiming the pipework in the garage to be an extraneous conductive part, then he must be able to demonstrate it.
 
Wrapping a wet cloth around it and pooring on a watering can should give sufficient environmental conditions short of a full flood (but then most of the South West would bond their curtain poles!).

Or you can always replace the bit that goes through into the garage with an insulated section.

Water mains entering a building should not be on the outside anyway.
 
Wrapping a wet cloth around it and pooring on a watering can should give sufficient environmental conditions short of a full flood (but then most of the South West would bond their curtain poles!).
That would certainly be a good start - but I don't think I'd get very rich if I was given a pound for every electrician who actually does that!
Or you can always replace the bit that goes through into the garage with an insulated section.
Of course, and then the issue would go away completely - a non-conductor clearly cannot possibly be an extraneous-conductive-part :-).
Water mains entering a building should not be on the outside anyway.
That is true for the primary supply to a property, but is not invariably the case for 'secondary' supplies to outbuildings. In any event, this particular discussion seems most commonly to arise in relation to metal oil pipes, connected to outdoor metal tanks which are just about held above ground level by some sort of stand/plinth.

Kind Regards, John
 

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