Martin Angove wrote in message ...
In message ,
(MBQ) wrote:

"John Stumbles" wrote in message news:85emc.201$oQ4.71@newsfe1-win...
"Martin Angove" wrote in message
...

[big snip]

If you mean an electrically heated shower then these take a *lot* more
power than an immersion heater and are fed from their own dedicated
circuit, usually rated between 30A (7kW) and 45A (10kW). They must also
be fed via an RCD.

In the case of a shower pump, the electrical work is relatively easy and
probably quite minor assuming the ring circuit isn't too far away from
the location of the pump. In the case of an electrically heated shower
the need to run a hefty bit of cable (6mmsq or 10mmsq) and to provide a
suitable supply will make the electrical work much more onerous.

Either will require the supply to be protected by an RCD.

Does it say that in the regs?


It depends :-)

Electrically heated showers are fixed electrical appliances in the zones
(zone 1 usually) and therefore must be supplied via an RCD.

Electrically pumped showers *may* be in the zones - where the pump is
part of the wall unit / mixer - or may be completely outside the zones
as in the case of a separate pump in (for example) the airing cupboard
with only the tap/mixer inside the shower. In the former case the supply
must be via RCD, in the latter case it isn't necessary.

Note that in the case of a pumped shower where the supply for the pump
is a fused spur from a sockets circuit, there may already be a suitable
RCD on the sockets circuit and no additional device is needed.

If you've never heard of bathroom zoning, there have been discussions on
this group about it several times, try a search.


I understand the principle of zoning.

I was questioning the emphatic "will require". Your answer clarifies
that it should be "may require" depending on circumstances.

MBQ