Andrew Gabriel wrote in message ...

The requirement to use an isolating transformer seems to be
a UK one.

Well I was talking about shaver outlets (for which there is a harmonised EN
standard) rather than sockets-in-bathrooms in general, which is a different
subject altogether. But now I'm trying to reacall whether I've seen a
UK-type isolated shaver point in a (mainland) European bathroom. TBH I
can't remember whether I have or not (which probably comes of being a
wet-shaver). Odd though to have a harmonised standard used in the UK only.

On sockets in bathrooms in general, an article in 'Wiring Matters' (Issue 7,
Spring 2000) which introduced the new 'zoned bathroom' regs. talks abut the
ongoing argument. Harmonisation through CENELEC seesm to have fallen apart
(again) leaving the UK free to do its onw thing. Equipment and appliance
manufacturers are very keen to see sockets allowed, but while the IEE admits
to "general agreement that a socket outlet in a bathroom protected by an RCD
is unlikely to [significantly] increase the risk of electric shock" it goes
in to say that "doubt remains". The anti lobby seems to be mainly the
government, in shape of the HSE, DTI and DETR, who "do not think that the
potential benefits are worth the risk".

US do. They have required RCD socket outlets in bathrooms for
a while now. They also require things like hairdriers to be
fitted with 5mA RCD plugs. Don't know how well they work after
you've dropped them a few times, possibly into the bath or sink.

OTOH 115V/5mA is 23k ohms. Would you _want_ to use a hairdryer with
insulation resistance that low?

--
Andy