Radial Lighting Circuit Spur

If the existing double socket is on a ring circuit and the socket is not already connected to a spur then take a spur from the socket to an fcu fused appropriately for the lighting circuit. If the existing double socket is on a radial circuit then extend the radial from the socket to an fcu fused appropriately for the lighting circuit. Feed the spur cable into the junction box.
radial lighting circuit spur

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Discussion in electricians talk started by major eyeswater dec 2.

Radial lighting circuit spur. As risteard has more or less said theres no such thing as a spur on a radial circuit. A spur can alternatively be connected at the consumer unit which although might seem incorrect is actually no different to connecting to an existing socket outlet. Unscrew the junction box cover. The spur socket only has a single cable with the connections to live neutral and earth.

This is exactly the same as connecting at the end of a radial circuit. By outlets i mean sockets fsu etc the only radial circuit exempt was lighting or so i thought thanks i dint know that tina lucinda lane dec 3. A radial circuit is a linear mains power circuit found in all homes to feed sockets lighting points and other specific items like showers cookers boilers or immersion heaters etc. As davey says yes you can spur of it.

Finding it difficult to understand how with a radial you can spur off spurs without overloading the cable. Radial circuits for socket outlets cookers shower and many other items. Most houses combine aspects of both types of circuits. Now if you spur off that spur your current could be 52amps so overloading the cable.

The loop in circuit has a cable running from light to light terminating at the last light as in the conventional radial circuits and then single cable run from the lights to the light switches. Prepare the cable route for the spur from the junction box to the new lighting point using 1mm 2 two core and earth spur cable. You can add as many lights as you want but dont exceed the rating of the cable or make the circuit too long that it exceeds the voltage drop limits andor the maximum earth fault loop impedance. Make a diagram of where all the cores connect.

I can understand if you spur off a ring that piece of cable can take potentially 26amps two 13amp fuses. It is simply a length of appropriately rated cable feeding one power point then possibly going on to the next. There are two distinct types of lighting circuit the loop in circuit and the older junction box circuit. Cut off the power supply to the relevant circuit from the consumer unit.