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Please read the disclaimer before attempting any electrical work. If you are uncertain then contact a qualified electrician.

Loop in ceiling rose lighting method

In this method, a twin and earth cable runs from the consumer unit to each of the ceiling roses one after the other, then a twin and earth cable runs from each ceiling rose to the switch.

This is the most common method used and the method i would choose if i was re-wiring the lighting circuit from scratch.

Loop in switch lighting method


In this method a twin and earth cable runs from the consumer unit to each switch one after another, then a twin and earth cable runs from each switch to the each light.

This method is the 2nd most popular and is great for things like wall lights or outside lights because there is only 1 two core and earth cable at the light fitting. There is nothing worse than having to struggle trying to fit 3 two core and earths inside a small wall light or small outside light.

Junction box lighting method


In this method, the twin and earth cable runs from the consumer unit to one junction box after another.
then from each junction box, one twin and earth cable runs to the light and another runs to the light switch.

This is in my opinion the worst way to wire lights. If you use the junction box method always leave them accessible in case of any problems in the future and you need to get to them.

Which cable size should I use for my lighting circuit? (1mm or 1.5mm)


1mm sq and 1.5mm sq =maximum of 1200 watts
1mm sq = maximum length must not exceed 83 m of cable length measured without the switch lengths
1.5mm sq = maximum length must not exceed 83 m of cable length measured without the switch lengths
(These cable lengths assume that the surrounding temperature does not exceed 30 degrees centigrade and that cables are not bunched together or covered with insulation of any kind)

Even if your circuits do not reach the maximum permissible load, it is normal to have a upstairs lighting circuit and downstairs lighting circuit. For example In the event of an electrical fault on the upstairs lighting circuit you will still have the lights on downstairs.

Tips


When choosing a position for a new ceiling rose I always bring the cables out directly next to a joist. If this is not possible then mount a wooden batten between the two nearest joists to provide a secure fixing for the light.

If you are using metal/chrome/brass switches always make sure the switch is earthed.

Check if your lights have earths, if there are no earths in your switches or lights get in touch with a qualified electrician.

Always use insulated tools when working with electricity.

Take your time and double over your simple cables as good practice.

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