How To Install A Light Fitting Uk

Wiring and Replacing a Light Fitting: Guide to Fitting Ceiling Lights

This DIY guide provides Data on how to wire and supervene upon a light plumbing equipment in your home including safety tips, two and three way lighting and plumbing equipment ceiling lights. This project also includes a light fitting diagram for a ceiling rose.

Alarm: To complete electrical works you must comply with Electric Regulations – Click hither for more information.

Please also run into our project on the New Wiring and Cable Colours.

The first rule here is, when wiring a light fitting or chaging a light plumbing equipment, if you are in any doubt whatsoever, become an electrician – Electricity kills.

Please remember when attempting whatever electrical installations at dwelling house that you are obliged to get the completed job tested by a fully qualified electrician and obtain a pocket-sized works certificate. Failure to practise this may render your house insurance invalid and y'all may have difficulty selling your dwelling house. You can too buy the tools and products you need for many electrical projects from the tools shop below this project. Please also come across our project Part P Building Regulations

Run into also, our lights and switches, our wiring in wall lights and likewise our electrical prophylactic projects.

Common Mistakes When Plumbing equipment Calorie-free Fittings

The nigh mutual mistake fabricated by people wishing to change their lite fittings, eg bulbs for spotlights etc, is that they accept down the existing light and ceiling rose without marker or taking note of where all the cables went.

Then comes the mistake, they join all the reds together, so all the blacks, earths are connected, switch turned on and "PING" the fuse blows or the trip-switch flicks off. Why? Well, 99% of the time ane of the black wires belongs to the switch cable that controls that lite. Both wires, red and black, are live wires in a switch as you will come across a trivial later. The black wire for the switch should have a little bit of red tape around it, or a footling red sleeve on information technology. This makes the job of identifying the switch cable easy. If there is no such labeling, an indicator is necessary.

Brand sure you lot mark any wires and cables yourself when necessary.

How Does the Lighting Work in Your House?

Not equally big a deal to sort out, merely get-go information technology is important to understand how the lights work in your house. The diagram below shows the circuits involved. (Please note some older houses may exist wired differently in junction boxes which volition be located under the flooring/loft, the principle is the same).

lighting circuit found in a house — lighting excursion found in a firm

Ability comes into the house to your fuse lath or consumer unit of measurement. The lights are fed from this via (by and large) two circuits. One for upstairs lights and one for downstairs. Both of these circuits should be on v amp fuses or MCB's (Miniature Circuit Breakers). This fuse, in theory, allows upwards to 12 100W bulbs to exist used on that circuit, in exercise no more than 8 are normally fitted. The cable runs from the consumer unit, to the beginning light fitting in the ceiling of that floor, it enters the ceiling rose where it is looped in and out to feed the next light, etc etc.

At the same time a cable is connected into the ceiling rose to the switch that controls that lite. With ordinary "one way" lighting, ie 1 switch controls only i low-cal, the diagrams and explanations below apply. For 2 and iii mode lighting diagrams, which can exist identified by additional yellow and bluish wires within the lighting switch cables, follow the link.

Removing Existing Light Fitting

When y'all have removed your existing light plumbing equipment and are faced with a mass of cables hanging out of the ceiling, life is a piffling daunting…But it is non as complicated every bit it looks.

You can run across from the above that the loop wires (all wires in this kind of lighting excursion belong to the lighting "loop") are continued to last blocks. The live final is fed from the consumer unit of measurement and in turn gives live power to the other cables in the circuit, in this case i supplies the live power from the source, where information technology is taken by cables 2 and 3.

The neutrals of cables 1 and 2 are joined together in the neutral concluding block, this is where the neutral side of whatsoever low-cal fitting will get. Cable 3 is the switch cablevision. As you can encounter more clearly from our diagram in lights and switches this cable interrupts the live menstruum with a switch. The switch simply cuts off the live current. The red and black wire either side of the ceiling rose are coloured like this for clarity to show live and neutral. With your light fitting flex, they will be brownish (Live) and blue (NEUTRAL).

When yous take removed your existing fitting, you will need to know which wires go to the switch. Hopefully, every bit explained above, they volition be labeled with either a piece of red record on the black wire, or a small-scale red sleeve. If you have no indication whatever of which 3 (crimson, blackness and earth) wires form the switch cable then you volition need a excursion tester. To employ this device is not difficult merely you must plow all the lighting power off beginning and take out the fuses and then they cannot be turned on by accident.

Pocket multimeter available from our superstore

Identifying the Wires to the Lite Switch

When the ability is OFF and fuses out, turn off the low-cal switch, ie make certain the switch is in the off position. Now it is a instance of trial and mistake. Hold the red and blackness terminals of your circuit tester to a ruddy and a black wire that announced in the same cable. (Using the diagram above, this would hateful either cable 1, two or three. And so turn on the light switch (With all ability off to the lighting circuits, there is no power to the switch).

If you have connected to the switch cablevision, the circuit tester will indicate that you take completed a circuit. If not , information technology will not move and you attempt the next fix of black and reddish wires that are in a cable together. When you lot accept identified the switch cable, mark the black with some insulating tape and even put a piece of record around the cable sheath so there tin be no error.

Fitting Your New Light Fitting

Ideally, your new light plumbing fixtures will fit over your ceiling rose and there will be no need to take it autonomously. The live and neutral of the new fitting but connect to the live and neutral the one-time fitting was removed from. If this is non the case, and then we will, need to suit the rose connections to suit the fitting you have.

The easiest way to do that is by making all existing connections into cable connectors (minimum v amp) or a junction box, as shown beneath. The live cables will exist joined as they were in the ceiling rose, as volition the neutrals, and finally, but very importantly, the earths.

With these connections made, the live, neutral and earth from your new light fitting can be connected. The base of most modern light fittings is big enough to muffle these new connections just occasionally i has to make a larger hole in the ceiling to push the junction box into. The light fitting is then screwed up as normal.

4 terminal junction box — 4 last junction box available from our superstore

Ceiling rose diagram for old wire colours — Ceiling rose diagram for erstwhile wire colours

Ceiling rose diagram for new wire colours

Using the same numbers for the cables every bit above in the ceiling rose diagrams, this is how the junction box would exist wired to replicate the circuit. The red tape on the switch live side of the excursion is shown. Good luck with your project and remember to stay rubber.

For regulations governing heights of sockets etc, delight see our socket tiptop information projection.