Can you use 3 core cable for lighting?

Asked By: Ysolina Begum | Last Updated: 13th May, 2020
Category: home and garden home entertaining
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3 Core cables
Domestic light fittings that are controlled by two switches (two way lighting) use 3 core and earth for connections between the two switches. The cable is made up of 3 solid cores, which are individually insulated and wrapped in an outer PVC sleeving.

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Also, what cable is used for lighting?

Lighting circuits are generally run in 1mm2 two-core-and-earth cable, but particularly long circuits can use 1.5mm2 cable to compensate for the drop in voltage experienced on long cable runs.

Also, what are the 3 wires on LED lights? Generally a white and a black wire will be provided. The white will normally be the ground(-) and the black will be the positive(+). LED Lights with 3 wires will be a multi-function light. They can (most times) be used in whatever configuration is right for your application.

Similarly, you may ask, what is 3 core cable used for?

Three core and earth cable: This type of cable is used for wiring two way light switches. The cable consists of 4 cores with 1 being the neutral and the other three potentially being live depending on the way the lighting circuit is designed and what position the switches are in.

What type of cable should I use for outdoor lighting?

Mains-powered garden lighting Once outdoors, you should supply your lights via 1.5mm² three core steel-wire-armoured cable (SWA). Make sure that you only fit weatherproof lights that are suitable for outdoor use and that your circuit is RCD-protected.

38 Related Question Answers Found

Can I use 2.5 cable for lighting?

1.5mm^2 cable is rated at 14.5 amps continuous under typical installation conditions. 2.5mm^2 cable is rated at 20 amps. It is fatter, heavier, more stiff and more expensive. There just doesn't seem to be any need to use it for domestic lighting.

What size wire is needed for LED lights?

What wire should I use? For single color strips, you only need 2 conductor wire, and for RGB strips, you need 4 conductor wire. We recommend using stranded copper wire 10-22 gauge. You said that the lights are dimmable.

How many LED lights can be on a 15 amp circuit?

Each CFL or LED bulb typically gives the same amount of light as a 60-watt incandescent bulb while drawing 10 watts or less, which is equivalent to a current draw of 1/12 amp. Thus a 15-amp circuit can safely control 180 or more fixtures that use CFL or LED bulbs.

Can I use 1.5 mm cable for sockets?

The cross sectional area of the earth wire in a 1.5mm cable is 1mm and in a 2.5mm cable it is 1.5mm. This should be sufficient for most domestic socket and lighting circuits.

What size wire is used for lights?


A standard 12-gauge copper wire has a diameter of 2.05 mm, while the diameter of 14-gauge copper wire is only 1.63 mm. If you're wiring a circuit on which there are both lights and outlets, or you just aren't sure which wire gauge to use, you can't go wrong by choosing a 12-gauge wire.

How many lights can you have on one circuit?

You can put up to 30 lights (based on 50 watt light) on a 15 amp breaker. You can put up to 40 lights (based on 50 watt light) on a 20 amp breaker.

What amp junction box do I need for lighting?

Rating of Junction boxes
The size used should equate to the current rating of the circuit being connected into – you can always use a higher rated box than the circuit but never a lower rated box. For a lighting circuit use a 20amp junction box and for a ring main or radial circuit use a 30 amp junction box.

Can I use Bell wire for LED lights?

It would be better to use stranded speaker or bell wire. The alarm cable is only designed for low currents and may not be suitable for your LED lights.

What is 3 core Armoured cable used for?

3-Core SWA Armoured Cables are live, neutral and earth, unlike 2-Core. Three core cable is for Class I or Single Insulated which must have earth connections. 4-Core SWA Armoured Cable are perfect for low voltage or low current signal applications.

Which cable is live red or black?


Additions to the old cables mean that some installations will have mixed colours within them. A mixed installation is shown below. You can clearly see that red is connected to the new brown (live), black is connected to the new blue (neutral) and the green and yellow earth stays the same.

What Colour is neutral in 3 core cable?

All three cores have coloured insulation: brown for live, blue for neutral and green/yellow for earth.

What is the GREY cable in 3 core and earth?

3-Core & Earth Cable. Three core and earth cable has three conductors which are colour coded, black grey and brown as well as the earth. One of the main applications for this cable is when two way lighting is required, it provides the additional conductor between two switches operating the same light fitting.

How do I determine electrical cable size?

These methods only require minimal equipment and are effective for virtually all cables.
  1. Look at the insulation on the cable. Search for text written on the insulation.
  2. Cut the wire with your wire cutters.
  3. Measure the diameter of the cross-section in inches.
  4. Divide the diameter of the wire by .

How do you calculate cable?

Divide the voltage running through the cable by your target current. If, for instance, 120 volts will act on the cable, and you want 30 amps to run through it: 120 / 30 = 4. This is your target resistance, measured in ohms. Multiply the cable's length by its material's resistivity.

What is 2.5 mm cable used for?


2.5mm Twin and Earth is commonly used as indoor domestic cable. The most common use for this type of cable is for circuits that provide power to sockets. It is made up of two cores and an earth core which must be covered with the identifying green and yellow sleeve when installed.

What is the difference between 3 core and 4 core cable?

Difference between 3.5 core 4 core cable -…
in 4 core cable all four cables are equal dia and in a 3.5 core cable 3 cores are equal dia and fourth one will be with half dia. and it is used for neutral in 3phase …

What Colour is Earth in Armoured cable?

sparkydude. Standard colours would be brown as live, black sleeved as earth and grey sleeved as blue as neutral.