Radial Lighting Circuit

Radial or junction box wiring picture 2 below shows a typical radial or junction box lighting system a two core and earth cable runs from the consumer unit to a series of junction boxes one for each lighting point ceiling rose. You may find this wiring arrangement in older properties. Unlike power circuits lighting circuits are always of the radial type.

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Multi point loop in radial lighting circuit the light wiring diagram shows how the live feed from the consumer unit fuse board shown in blue in fig 1 feeds into the first ceiling rose ceiling rose a fig 1.

Radial lighting circuit. There are two distinct types of lighting circuit the loop in circuit and the older junction box circuit. A radial circuit must follow these rules in general. Wiring lighting circuits as a ring circuit in general domestic installations would be troublesome and adding unnecessary complications. It is simply a length of appropriately rated cable feeding one power point then possibly going on to the next.

Most houses combine aspects of both types of circuits. The circuit terminates with the last point on it. Lighting circuits are wired in two different ways using either junction boxes or loop in ceiling roses. Fig 1 shows what is referred to as a radial circuit sometimes called a loop in or multi point radial lighting circuit.

Radial lighting circuit wiring diagram wiring diagram is a simplified up to standard pictorial representation of an electrical circuit. 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. From each junction box a separate cable runs to the light and another runs to the switch. Light wiring diagrams old multi point radial lighting diagram using junction boxes fig 1 shows what is referred to as a radial circuit sometimes called a loop in or multi point radial lighting circuit.

Floor areas of no more than 50m2 requires a 20 a fuse or miniature circuit breaker protection with 2 5 mm live and 1 5mm protective conductors or 1 5 mm if m i. The cable leaves the consumer unit and runs to each outlet position before terminating at the last fitting on the line. A standard radial circuit can be extended from any point or points that provide a permanent live neutral and earth without worries about having a spur off a spur or extending the ring. Which uses junction boxes instead of ceiling roses.

These days the loop in system predominates though individual circuits often combine the two for the most economical use of cable. It shows the components of the circuit as simplified shapes and the skill and signal associates in the middle of the devices. Lighting circuits lighting circuits are basically radial circuits.