Mike Hall wrote:


2. In replacing the wiring to the light switches, I intend to use the
existing cable to pull through the new stuff, (it is in oval conduit).
Has anyone got any tips for how to mechanically connect the two
cables, obviously with the smallest possible cross section to enable
the joint to pass through the conduit. Is insulating tape generally
strong enough ??


What I do is as follows.

Strip off insulation outer on both.

Cut back all except one condictor and strip that.

fold over that and teh similar one on teh new wire, to make 'U's

Interlock those and twist together hard.

Cover the while joint in insulation tape.

This is about as small as it gets.

Some people use the old to draw a doubled string through, cut that, and
use one half to attach to the new wire., and leave the other in place
'just in case'