"Broadback" wrote in message
...
What is the rational behind earth bonding? Surely one bond to copper
water pipes should be sufficient, after all copper and the water it
contains are conductors.

I was befuddled by a comment on one of TV's home programmes. The
presenter looked at the toilet and said, this will have to be bonded,
there is a risk from the toilet flushing handle.

Because he was being a smart alec - again.

Firstly how did he know that it was not bonded below the floor?

As the house was quite old it probably had all copper pipes and was bonded
at the water and earth entry point to the house. Only modern plastic
plumbing needs wires everywhere and even these should be crimped and hidden
under the floor to stop little fingers fiddling with them.