Can a fused spur be part of the ring main?

No you can't do that, Mr I. 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.

Can you spur off a spur on 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.

How many socket outlets can be connected to a fused spur on a ring circuit?

Only one socket outlet can be connected to a spur. (This can be a single or double outlet). Connecting a further outlet is NOT permitted, as this could overload the single cable supplying it. Each socket outlet or junction box on the ring can only have one spur connected.

Can you spur off a ring main in 1.5 mm?

no because you will have a 32 amp mcb protecting a 1.5mm2 cable.

Can I run two sockets off a fused 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.

Fused connection Unit Wiring FCU How to wire Fused Spur

How many fused spurs can you have on a ring final circuit?

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.

Why can't you run a 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.

How long can a spur off a ring main be?

Section 7.2. 2 of the OSG says 'as a rule of thumb for rings, unfused spur lengths should not exceed 1/8 the cable length from the spur to the furthest point of the ring'.

Can I add more sockets to a ring main?

In this case, you'll need to add a spur from a ring circuit. You can either run this from an existing socket, or from a junction box that's connected into the cable run of a suitable ring circuit.

When should a fused spur be used?

Fused spurs are commonly used as an alternative to a conventional socket, for the installation of powerful electrical appliances that can be installed without a plug, such as ovens, washing machines, electric heaters, dishwashers, fridges, and so on.

How many sockets can you put on a ring main?

There is no limit on how many sockets you can install on a 32-amp ring main. However, the maximum load for a circuit at any given time should be 7,500 watts.

Can I use a junction box to extend a ring main?

Effectively you cut the wire on the ring feeding a new wire to socket via a juction box, then feed a wire from socket back to the other wire on the ring via a juntion box. Extending the ring gives you the option to extend in the future.

Can I install a fused spur myself?

As long as the job isn't within a 'special location' such as a bathroom or outdoors, you're also allowed to install additional new light fittings, switches, sockets and even add a single fused spur to an existing circuit (a 'spur' is a new cable and socket run as a branch from an existing socket on the ring main).

How many sockets can I have off a fused spur?

How Many Sockets Can Be on a Spur? Only one spur can be connected to a single socket.

Can I spur off a socket for an outside socket?

You can wire an external socket in the same manner as a normal spur, by running the cable from a socket or junction box on a main ring circuit (via a switched connection unit) and mounting the socket on an external wall. Ensure your circuit has RCD protection, and that you use appropriate weatherproof outdoor fittings.

How many amps can a spur take?

The maximum load you can run from a spur is 13A (Approx 3kW). If the sockets are fed from a fused connection unit (and fused at 13A) then the number of sockets supplied could in theory be as many as you want - providing that the total load of what ever you connect/use simultaneously doesn't exceed 13A.

Are ring mains still used?

Yes, ring mains (more correctly called ring final circuits these days) were and still are the norm for most UK dwellings. A very common arrangement was two ring final circuits, one for upstairs and one for downstairs.

Is extending a ring main notifiable?

extending an existing ring main is considered minor work and a minor works certs is all that required. installing sockets to external building is notifiable.

Can you add a fused spur to 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.

Can I use 1.5 mm cable to a fused spur?

It depends. If a fuse spur has been installed and then a supply from that has been taken to your new socket in 1.5 then its fine as the fuse spur will limit the current to 13 amps which 1.5 can handle. If its direct off another socket then it must be 2.5 in normal domestic wiring.

Can you mix 1mm and 1.5 mm cable?

IET Forums - Mixing cable sizes. So it's ok even if I have wired half of the circuit in 1.5 and then do the rest in 1mm. Yes, mixed cable sizes are fine provided that the smallest cable is compliant for the size and type of OCPD. AND that the voltage drop for the entire circuit is within acceptable limits.

Can I use 2.5 mm cable for sockets?

2.5mm is commonly used for behind sockets, while 1-1.5mm is most often used for lights (depending on how many lights you have in a circuit).

How many sockets can you have on a 2.5 mm ring main?

The cable itself can be up to 60 meters long if it is protected by a cartridge fuse and 50 meters long if protected by an MCB. 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.