"Andy Dingley" wrote in message
...

Equipotential bonding is there so that no two metal objects can
develop a high voltage across them. This is typical from a high
impedance fault condition - maybe a heater with failing insulation,
not enough to cause an earth fault, but still enough to make the case
give you a shock. Humans are normally high impedance, so won't suffer
such shocks - but wet humans are much more conductive, so bonding
becomes especially important in bathrooms.

or to look at it another way....
(a)even more paths for across the chest shocks
(b)more things that can become live

you are not allowed bare protective conductors
but you can have acres of bonded metal

where I work bonding causes more problems than it solves
because it just increases the chance of electrucution

Isolation, insulation & electronic protection !