In an earlier contribution to this discussion,
Martin Pentreath wrote:

Many thanks to all for the electrical advice on other threads. I am
aware of Part P - I am trying to get various things sorted out and
cables put in before getting an electrician in to do the final stages.

Having thought a bit more about my garden wiring I would like to be
able to control separately both a small fountain and some outdoor
lighting from within the kitchen. I would take these off the same 13A
spur from the ring - the load would be no more than 300W.

Rather than running two cables can I (for the sake of neatness and
economy of cable) use four-core cable, with two separately-switched
lives? The fountain and the lighting would then both share the neutral
and the earth. Just need to know so that I can order some cable and
put it in now.

As long as the neutral can handle the current of both appliances at the same
time, and as long as the single earth wire is adequate, I don't see a
problem.

I did something similar with my pond wiring (pre-Part P!) - using a 7-core
SWA cable for water pump, air pump, and UV filter - each seperately
switchable from the house. In my case, each had its own neutral - with just
the earth wire being shared.
--
Cheers,
Set Square
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