I need to move a socket around a metre lower and therefore need to extend the cable, which is a spur from a socket in the room above. The access from above is very difficult so running a completely new cable would be quite disruptive.
What is the correct way to extend a cable behind plasterboard? I think part P says that all connections have to be 'accesible', but what does that mean exactly. Is it acceptable to use a junction box, if the wall is then plastered over?
The type of join will determine if it needs to be accessible. There are now JB's that use a spring clip arrangement and can be used where inaccessible also there are crimp and solder connections.
I would consider where the sheaf is removed then the cable should be placed in a device that replaces the sheaf as well as joining the wires together for example a junction box with cable grips or epoxy shrink sleeve.
There are so many options I would advise a visit to local electrical whole sale outlet not a DIY outlet and ask and then decide what is best in your case.
It will not have screws in it though as screws can work lose.
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