The Medway Handyman wrote:

2] Cut out small damaged section of cable, use cable crimps to re join, bury
in new plaster. There is enough slack to do this. Simplest option,
cheapest for customer.

So long as you use heatshrink to insulate each wire, and a second layer
to insulate the whole join then you will be fine. It helps if you cut
each wire a different length such that you don't end up with a bunch of
crimps beside each other which will make getting the overall heatshrink
on a tad trickey!

To test your work you could disconnect the cable at both switches and
then short all the conductors together at one. Now use a low ohms range
to measure resistance between them at the other end. That should prove
you have a low resistance join. You can compare your readings with the
resitance / metre tables in the OSG (assuming you know the approximate
length of cable).

What's the point in PVC channel anyway? It offers little protection. Is it
just to make thing easier for the plasterers?

Basically yes - protects the cable from trowel damage, and holds it flat
to the wall. It is sod all use later should you want to extract and
replace a cable.

--
Cheers,

John.

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