In an earlier contribution to this discussion,
Peter F wrote:

Following recent helpful advice on this group on destroying my house
I come to you bearing another question...

If, as part of a house rewire the electrician was asked to put in a
feed for a shower, what size cable and capacity MCB would you
reasonably expect? Cable run is about 15m

On the basis that *no* electric shower is much cop - and that anything under
10kW is no use whatsoever, I would plan for 10.5kW. This will require about
45 amps at 230v - so use a 50 amp breaker and 10 sq.mm cable.

What do folk reckon the average/minimum rated shower would be?

You can buy 8 kW showers - but I wouldn't bother!

What size shower could be run from 6mm cable?
What size shower could be run from a 32A MCB on aformentioned 6mm?

According to http://www.tlc-direct.co.uk/Figures/Tab4.7.htm a 6 sq.mm cable
is ok for about 38 amps (8.7 kW) if it's in a conduit on the wall and not
thermally insulated - but a 32A breaker will limit you to about 7.3 kW.

--
Cheers,
Set Square
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