It is not particularly difficult to extend a ring main but you must remember that certain rules apply about the floor area and length of cable one ring main may serve and use.
Can you extend a ring main from a socket?
The best way of using junction boxes to extend a ring circuit, is to find the length of cable between the two sockets on the existing ring closest to the desired extension area. Once located it can be cut in the middle giving two lengths of cable from the existing circuit to use in the extension.
How many times can you spur off a ring main?
A spur can be connected to an existing socket, on either a ring main or a radial circuit, providing that socket does not already have a spur. That is only one spur per socket is allowed and the number of spurs must not exceed the number of sockets.
Can I spur off a ring main?
The rules for spurring off ring circuits are you are allowed ONE unfused spur to a socket (single or double) or ONE fused spur to as many sockets as you wish. You can’t have both on the same point.
How many double sockets can a ring main have?
There is no limit to the number of sockets you can have on a ring main but there is a limit to the number of spurs you can have from those sockets or from the wiring between them. If you would like to know how to add a spur to an existing ring main, see our project on adding an extra socket.
Can I use Wago on ring main?
Yes, but a few points need to be observed to make sure it complies with BS7671 IET 17th Edition. Firstly, the terminals must be installed in a Wagobox (when breaking into existing ring wiring).
Is it OK to use a junction box to extend wiring?
Yes. You can definitely use a junction box to extend your wiring. To do this, start by turning off the power.
How do I join ring main?
The easiest way of connecting into a ring circuit is to run a spur cable from the terminals of an existing socket – but you can’t connect it to any socket. The IEE Wiring Regulations are very specific about this. You mustn’t run a spur from a socket that’s already on a spur, or that already supplies a spur.
Can I put 2 double sockets on a spur?
you can have maximum one double socket as a normal spur but if you are going from socket to FCU fused at 13 amp from there you can add as many sockets as you wish as all the sockets and cable will be protected by the fuse so no chance of overloading the cable the fuse will blow first.
Can you fuse spur off a spur?
You can but you may risk overloading that spur causing the 13a fuse to blow what is your intended use for your garage sockets and your conservatory.
Is it OK to spur off a spur?
The reason for not running two spurs from the same spur “point” is that it can lead to possible overloads in that one leg of the final can become unbalanced and exceed the max. allowed amps for a bit of 2.5mm if the tap off point is near the cu.
