You will probably use 2.5 mm or above cable. You can either fit a switched fused spur unit, which will act as the light switch. Alternatively, fit an unswitched fused spur unit, THEN an oridinary light switch. The fused spur unit will need a 3 or 5 amp fuse..
Consequently, can you take a spur from a fused switch?
) has only one cable feeding it then it is already a spur and you cannot run another spur from it. If it has two cables feeding it then it MIGHT be part of the ring and then you could spur off it.
Additionally, what is a fused spur used for? A Fused Spur Switch is commonly used for powerful electrical appliances, such as washing machines and dish washers that need to be installed without a plug; they are also used for electrical items that need to be installed on a separate cable from the ring main, for safety and maintenance purposes.
Beside above, can I run a spur from a light switch?
You'd probably do better running the spur from the nearest light fitting, or the CU (fuse box) unless there is as some have pointed out, a neutral at the light switch.
How many sockets can I have on 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.
Related Question Answers
Can you run a spur from a spur?
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 run wall lights from a socket?
Re: Adding wall lights - run from an existing socket? lights need to be a lower fuse rating so you must wire this switched form a switched fused spur. then take the fuse out of it and change it for a 2-3amp one. use 2.5mm T&E cable from the socket to the switched fuse spur and then 1.5mm to the lights.Can you put a fused spur on a ring main?
A fused spur can be added as part of the ring or it can be a spur of a socket that is part of the main ring that is not spurred from already.How many watts can a double socket take?
2400 watts before the breaker trips. The breaker will be labeled either 15 or 20. Each socket (presumably for flat pin plugs) is designed to deliver a maximum of 13 amps - hence the 13 amp fuse you find in new plugs. Thus a double socket can supply no more than 26 amps.Can I use 1.5 mm cable for sockets?
Using 1.5mm in a ringmain is OK as the purpose is to reduce the overall thickness of the cable needed to provide the same voltage. As you are putting a spur it 1.5mm is fine as long as you don't use more than 16 amps.Can I use 2.5 mm cable for lighting?
You will find twin core and earth cabling used all over your home in a variety of sizes. 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 do you add more light to a circuit?
Adding a Light Fixture Mid-Circuit You can usually install a light fixture between an existing one and the switch by cutting the cable to the existing fixture at the location of the new one, inserting the ends of the cable into the electrical box for the new fixture and pigtailing the new fixture onto these wires.Can you use a FCU as a light switch?
If you used a switched FCU you could do away with the light switch. Using your suggested configuration, the 1.5mm goes from the load side of the FCU, the live goes to the COM of the light switch and the neutral to a connector.Can you run a light switch off an outlet?
Wiring a Switch to a Receptacle Run a cable to the light fixture and another cable to the outlet from which you're drawing power. Turn off the power to the outlet, and before making connections, test the leads with a voltage tester to make sure they're dead. At the outlet, you connect the cable to the load terminals.What is an FCU?
A fan coil unit (FCU), also known as a Vertical Fan Coil-Unit (VFC), is a simple device consisting of a heating and/or cooling heat exchanger or 'coil' and fan. It is part of an HVAC system found in residential, commercial, and industrial buildings.How do you wire a new light switch to an existing switch?
Unscrew the two screws that hold the switch in the box, and pull the switch and the wiring out of the box as far as the wiring will allow. Insert a new section of electrical cable (of the same gauge and configuration as the wiring already in the box) through the hole in the back or side of the box.How can I tell if my socket is on a spur?
The first image is how the back of your double socket should look and the second is the wiring for a spur. A general rule for a ring main is that if you only have two cables in the back of an existing socket then it is ok to spur.How long is an electrical spur?
The maximum length allowed for an unfused spur is 3m. The general rule of thumb, is that you can have an unfused spur at each socket, and one at the CU.Which is feed and load on fused spur?
The feed is the cable from your fuse board, supplying the power to the isolator switch. The load is the cable supplying the appliance once you have switched the isolator into the on position.What does load mean on a fused spur?
Load is going to heater. Supply comes from socket.Can you use a junction box to extend wiring?
If you do need to extend the wires, yes, a junction box would be needed. It must remain accessible. You've pretty well identified your two choices; if you don't want to re-run longer cables, you'll need to splice in some additional cable.What is a fused switch used for?
A Fused Spur Switch is commonly used for powerful electrical appliances, such as washing machines and dish washers that need to be installed without a plug; they are also used for electrical items that need to be installed on a separate cable from the ring main, for safety and maintenance purposes.How many sockets can you run 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. 
