Hi, I am currently trying to change a one way socket to a double. I have a box that the new socket will screw in to, stops me having to chisel out the wall. Only trouble is the wires are not long enough. Is it safe to to use terminal strips?
Yes.
How many cables?
Can you post a piccy?
With your 3 new pieces of wire, you can connect together the 3 lives, the 3 neutrals and the 3 earths and just connect one of each to the socket.
No need to use two pieces and connect two lots to the socket.
If there is an earth wire connected to the back box include that as well.
Normally, we do not use flex for fixed wiring.
You better off with this
https://www.screwfix.com/p/prysmian-6242y-twin-earth-cable-2-5mm-x-10m-grey/82572
3-way Wago connectors would be best bet
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