How should my light be connected to this old wiring layout?


In the UK colours are as follows

old UK colours newer EU colours live red brown neutral black blue earth green green/yellow

The switched-live from switches is often insulated with the neutral colour (e.g. black) and should have red tape over it to indicate it is switched-live not neutral.

Your problem is that, to make sense of wiring, you need to carefully study the wiring before you remove a fitting and make sure you understand how it works. It can be difficult to do this after the wires have been removed from the fitting.

In some cases, a lot of the electrical wiring is done inside the casing for long fluorescent light tubes. This can include wiring for other light fittings in other parts of the room or in other rooms.

The problem is at some stage there were two switches for the light

Typical UK 2-way switch wiring is as follows

The image shows a pendant light, but the same principle applies for a...

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Basically, you want to start with a switch. You run a black and white wire in from the bottom of the switch box (from the panel). This will take the form of 12/2 or 14/2 cable. You run another 12/2 or 14/2 cable from the top of the switch box to the first light. You connect the black wire to the switch. You connect the 2 white wires together, and then connect the other terminal on the switch to the black wire of the cable leaving this junction box towards the first light. The ground wire should also be connected together in this manner, but to the ground terminal on the switch. Each light will have a cable "entering" (from the switch) and "exiting" (away from the switch). At each light you'll connect the entering and exiting black wires together, as well as 1 terminal on the light. Do the same with the white wires. If there is a ground terminal on the light, do that as well, otherwise just connect the incoming and outgoing ground wires together. At the last light, just connect the...

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Old UK wiring was as shown below

A comes from the fuse-box/consumer-unit (possibly via other junction-boxes/roses for other ceiling lights). B goes to the next ceiling light. C goes to the light switch for this lamp.

However most electricians will not have cable type C with two red wires and will have used regular cable with a black and a red wire and will put red tape around the end of the black wire to indicate it is "switched live" and not neutral (as it's black colour would suggest).

From what I've read, sometimes they would connect C's black wire to position 3 (the other red live wires) and then C's red wire would be the switched-live return from the switch. Connecting the black to the reds would make it obvious to an electrician and that might be why no wire had red-tape on it's end.

If someone has removed the red tape, you can:

turn off the lighting circuit at the fuse-box/consumer-unit, check there's no voltage present with a...
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Although it’s easy to wire a light switch, you need a basic understanding of home electricity in order to do the job safely. If you’ve never before worked with wiring, hire an electrician and ask to look over his shoulder. Once you’ve learned the procedure, you should find that it takes no more than 10 minutes to wire a light switch. No advanced tools are required, and the steps are identical whether you are replacing a damaged switch or swapping in an upgrade (for example, a dimmer).

- Single pole light switch
- Screwdriver
- Pliers
- Multitool
- Electrical tape

It is vital to complete this first step correctly; skipping this part or doing it wrong could be fatal! Before you do anything else, ensure that no power is running along the circuit that you’ll be working on. That means going to the breaker box and switching off the breaker that controls the switch you intend to...

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here we have a 3 way switching lighting circuit (sometimes called two way switching with intermediate). This allows a single light to be turned on or off from any of the switches.This page shows it wired in the new cable colours if your house has the old colours you want to go here:

Three way switching (old cable colours)

This is very similar to the two way switching circuit but with and additional intermediate switch introduced into the three wire control cable that links the two end light switches.

Fig 1: Three way switching schematic wiring diagram

The circuit consists of a two way switch at each end (top and bottom switches in Fig 2) and an intermediate switch in the middle. All three switches are connected together by a three core and earth control cable. Notice that the wire connected to the COM terminals is looped straight through the intermediate switch using a cable connector.

Fig 2: Three way light switching wiring diagram


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Wiring gauge tells you exactly how much current the wire can carry. It's an inverse relationship: higher current runs on thicker cable, which is indicated by a lower number gauge. Wire should be purchased according to the type of light you have selected, the location of the lights and the wire layout.

Decide where you want to run your wires: stapled exposed under the handrail, hidden in a routered space within the railing, or under the deck and up each post. As current runs along the main cable to each light fixture in a circuit, voltage drop may occur, which can lead to insufficient voltage being supplied to lights at the end of your run. To limit voltage drop, it is recommended that for circuits with multiple light fixtures and/or long runs, you loop the main cable as illustrated in the first diagram below.

For each diagram below, fixtures should be attached by splicing the fixture wire leads into main wire run and using weather proof wire nuts to make a connection....

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Shut off the circuit breaker that supplies electrical current to the area of the house where the light fixture is to be installed.

Pull out and separate the wires from the electrical box where the light will be installed. Straighten the wires so there is no confusion which wire is which. There should be a white wire, a black or red wire and possibly a copper-colored wire. These are the neutral, hot and ground respectively.

Strip off 2 inches of insulation from the end of the neutral and hot wires using wire strippers.

Prepare the old wires of the light fixture in the same way as you did with the house wiring.

Pair the hot and neutral wires from the fixture with the hot and neutral wires from the house wiring. Place the like wires parallel to each other and screw a wire nut onto each pair. Wrap the pairs with electrical tape. Since the old fixture will probably not have a ground, stuff the ground wire back into the electrical box.

Set the...

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Driving and electrical wiring in the apartment

When carrying out repairs to the premises oroccurrence of any fault related to electricity, it is necessary to know the exact location of all electrical components. When you check into the apartment stands a huge disadvantage that the mounting wiring plan is not issued on the hands of the residents, unlike the private sector, where the executive scheme - binding instrument at the project coordination of the relevant authorities. So what to do in this case? Of course, you can try to find it in the REU or housing department. But less energy-intensive option when the circuit diagram is made either by his own efforts in the apartment, or with the help of specialists. In this article we'll talk about what are the different options for power supply of flats and how to chart electricians.


Methods of connection of electrical circuits The main types of wiring layout Preparation of electrical wiring diagrams...
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Run the cables into the new electrical box. There will be two sets of cables: the cable that ran into the old electrical box and the cable you ran from the light fixture. Pull both cables through the new electrical box.


Place the electrical box into the hole you created in the drywall. The fins on the outside of the box should rest firmly against the wall so that you can screw it in securely.


Screw the electrical box into the wall. The box has fins that flip inside the wall when you screw it. Make sure you feel the fins flip as these secure the box to the wall.


Use a GFCI outlet.

A ground fault circuit interrupter outlet will help prevent dangerous shocks that could seriously injure or kill someone.

[11] Once installed, this outlet ground-fault circuit interrupter will shut off instantly if the circuit shorts or is overloaded.


Connect the wires from the new outlet to the cables in the electrical...
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Before going to the store to buy recessed lighting, it would be wise to create a recessed lighting layout. This will allow you to buy the right number of recessed lights with the correct trim and will help the electrician or yourself place them in the ceiling with little damage.


Draw a box to scale with the room you will be lighting Draw the lights into the space to scale Group them for switches

Guidelines and Considerations

1. What room is this for?

Some rooms need more light than others. Kitchens and bathrooms, where specific tasks are taking place like cooking, need more light than rooms for general purpose, such as a living room. This, however, does not necessarily mean that every spot in the kitchen should be covered with recessed lighting, only that there should be adequate lighting (cans are 2 ft. apart with a stronger bulb accompanied by under cabinet lighting and pendants).

2. Is it general lighting...

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Arnie has been in touch again:

“Jim, Nice work. Looks like your N layout is progressing nicely.

And Dave — many thanks to you for taking the time to create a How-To video on lighting. I’ve gotten a number of requests on this topic but have not had an opportunity to make a How-To video. I all too often jump into my projects only to realize later that a How-To on my lighting (and other things) would have been helpful to others. So thanks again.

By the way, pay heed to Dave’s comments and reiterations of using regulated power. Using multi-voltage power supplies is a safe bet.

But if you don’t have such power supplies available, be sure to use resistors to help ensure the voltage capacity of bulbs and LEDs is not surpassed! If your lighting items do not come with resistors, you can check online for info on how to calculate what capacity resistor you should be using with your light source. I’ve found that resistor values of ~620...

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2 way switching means having two or more switches in different locations to control one lamp. They are wired so that operation of either switch will control the light. This arrangement is often found in stairways, with one switch upstairs and one switch downstairs or in long hallways with a switch at either end.

Here we have a two way switching system that utilises two single gang two-way switches and a three wire control, shown in the old cable colours. It is possible to achieve a similar result using a two wire control which, although it saves on cable, is not recommended. This is the preferred approach.

Here we a have a schematic (Fig 1) which makes it easy to visualise how this circuit works. In this state the lamp is off, changing the position of either switch will switch the live to the lamp turning it on. If you now change the position of the other switch the circuit is broken once again.

Fig 1: Two way switching schematic wiring diagram (3 wire...

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