Socket Ring Main Junction Box

Run the new length of cable 2 5mm 2 round the room from one junction box to the other.

Socket ring main junction box.

A ring main more about ring mains can be found in our project here and also a radial circuit more about radial circuits in our project here will need a 30 amp junction box whereas a lighting circuit although you can buy 5amp junction boxes will need a 20amp junction box. Lift the floorboards and locate the cable that runs closest to your new socket. A new length of cable 2 5mm 2 should run between the new spur socket and the planned location of the junction box. The diagrammes below show how you can break into a ring main with junction boxes to extend it.

Where you desire a socket leave a generous loop of cable out of the wall which can be attached to a new socket once the job has been successfully completed. The number of spurs on the ring must not exceed the number of other socket outlets. These rules apply to spurs also. To install a spur from a junction box you require a 30amp junction box.

These rules can be found in our ring main project. There is no set limit to the number of sockets on a ring main as long as you stay within the rules mentioned above. Locate the cable of the ring main as close to the new socket as possible. Trying to connect two or more is not only very difficult due to the number of wires involved it can also result in an abnormally high load at that point in the ring.