Dave Plowman (News) wrote:

Use a cord outlet to do the change from cable to heat resistant flex and
situate the FCU elsewhere - like outside the bathroom.

An ordinary flex outlet isn't allowed in Zone 1 or Zone 2 since it
wouldn't meet the IPx4 requirement. To make a connection in those zones
you'd need a IPx4 (or better) adaptable box and cable glands. Best to
get the connection into Zone 3 if possible - i.e. at least 600mm from
the bath - and then an ordinary FCU can be used.

Did the OP realy mean Zone 1 - over the bath?

An electric towel rail is not allowed in Zone 1 unless it "cannot
reasonably be located elsewhere." If it is installed in Zone 1 it must
be 30mA RCD protected. If it's fed from a RCD protected ring (or
radial) circuit, itself fed from the RCD side of a split-load CU then
then you're OK, otherwise an RCD spur will be required. (The RCD
protection is not required for Zone 2 or beyond.)

If installed in either Zone 1 or 2 the rail must be suitable for those
areas and should meet IPx4.

Don't forget the supplementary bonding, if required.

--
Andy