wrote in message
...
The stuff on equipotential bonding in bathrooms has changed with the
17th edition of the wiring regs.

Agreed, however supplementary bonding rules may still apply. Take a bathroom
with an electrical installation that meets the 16th edition and then you add
an electric shower. The 17th edition will probably require the cable for the
shower to be RCD protected but if you are not touching anything else
electrically in the bathroom then the new shower would need to be
supplementary bonded to the rest of the bathroom electrics (and metal
pipework).

Adam