John wrote:
I've been renovating the G/Fs bathroom this week, upon going to turn off
the shower supply, I found that it was supplied from a really old fuse
box, as well as looking like it is a spur from the cooker supply.
There are no RCDs anywhere in system.

I'm not an expert but I'm also learning about 21st centruy house
electricks..
and in my sister's flat someone had hotwired a shower onto the cooker
circuit...

If a cooker needs a 30amp fuse and the shower needs 20 amps
and if you want them both on at the same time
that would mean you'd use a 50amp fuse
which means you could have 30amps over current on the shower before the fuse
blows-
so that's not much protection,
I'd get scared and put in a new wire with RCD for the shower.

I think under part P a competent electrician has to install a new bathroom
circuit,
but over half the work is the planning and the measuring
and drilling holes in the walls and fixing conduit routes
which I plan to do myself first.

--
[george]