# Explanation for wiring diagram for double light switch

• 2 Way Switch Connection | 3 Type of Two Way Switch Circuit Diagram Explanation
• Two way Light Switch Connection
• What is Two Way Switch Wiring : Circuit Diagram & Its Working
• How a 2 Way Switch Wiring Works?
• Light Switch Wiring Guide: Both Single Pole, Two-Way & Dimmer.
• 2 gang 2 way light switch
• ## 2 Way Switch Connection | 3 Type of Two Way Switch Circuit Diagram Explanation

Wiring a Single Pole or one way light control Wiring a single pole light switch is easy, it requires 3 insulated wires. Two hot wires, and a ground wire. Procedures Connect the black wire from the junction box to the dimmer or switch box, and then to the smart bulb. Draw the earth or ground wire straight from the distribution board DB to the switch and then to the incandescent. Also draw the neutral wire from the power source to the light fixture to complete the circuit.

The reason the hot or black wire was first connected to the switch is to control open and close the circuit. After the connection, tighten the switch on the electrical box.

How to wire a 2-way smart switch A 2-way light switch, also called staircase switches, allows you to control a light bulb from two different locations. It is useful in staircase lighting and hallways as you can power ON the light before climbing upstairs and also OFF the light fixture when you climb up. Methods of wiring 2-way switches There are two methods of wiring 2-way switches, the standard or 3 wire control and the old or 2 wire system.

The standard 3 wire control method This wiring method requires two 2-way switches and three-wire controls such as Romex. It uses a new standard wire recommended by the National Electrical Code. Below is the wiring diagram for a standard 2-way outlet. From the schematic diagram, you can see that we connected the live wire to the L1 of the two switches, we also connected the L1 to the respective COM before linking the two COMs together.

We equally connected the L2 terminals of the two outlets to the light fixture or bulb, and the neutral of the bulb, to that of supply.

You can close and open the circuit from any of the toggle switches above. If you still have the old wire in your home, you can still use the 2 wire controls. Below is the wiring diagram. From the diagram, you can see that we connected the live wire from the DB to the COM of the first dimmer, we then ran two traveler wires connecting the L1 to L1, and L2 to L2 of the two dimmers.

Whenever you toggle any of the two switches, it lights on or opens the circuit. Dimmers usually come with three short wires, two blacks, and one earth wire. Installation procedures Before any installation, check the power rating of the dimmer you buy. Most of them can handle up to watts. Check the wattage of your bulbs and make sure you did not overload the dimmer.

These lights require low-voltage dimmers. Here are the steps to follow. Turn OFF the power from your electrical panel Unscrew the switch plate and also check the circuit with voltage tester to make sure it is dead. Lose the switch from the electrical box and pull it out. Disconnect the old wires from the switch and connect the dimmer.

Use the connectors that come with the fixtures to connect the wires, respectively. Frequently Asked Questions Does it matter which wire goes where on a smart light switch? No, it does not matter provided it is a single-pole switch with two terminals. What is the meaning of L1 and L2 on a light switch?

L1 and L2 means line 1 and line 2, while COM is common. Related articles.

## Two way Light Switch Connection

Here is a two way switching solution posted for one of our users who had run the power feed to one of the switch boxes and had no radial circuit to pick up a neutral at the lamp holder.

If you are doing a new install or replacing a two way switch system go for the three wire control method. This is fine when executed correctly but here is what you need to look out for: where this is used in a stairwell where you have a switch upstair and a switch downstairs there is the danger that the neutral and the live come from different lighting circuits.

See Fi2 2. But read on.. You see this method offered on many DIY sites but the safety issues are rarely explained adequately. The good thing about twin and earth cables is that the live and return are always in close proximity in the same cable so there is a cancelling effect.

Now consider Fig 2 again, the live feed leaves the consumer unit fuse board and runs round the house to the downstairs switch, it then runs upstairs to the second switch, up through the light. The path to neutral may well run around the upstairs lighting circuit before making its way back downstairs to the consumer unit. 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. If your circuit has the new cable colours see: Two-way switching 3 wire control, new cable colours 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 control The schematic is nice and simple to visualise the principal of how this works but is little help when it coms to actually wiring this up in real life!!

Fig 2 below shows how we achieve this configuration. Just like any loop-in loop-out radial circuit , the switch cable from the ceiling rose contains two wires, a permanent live and a switched live. This is cable C below, one wire connects to L1 and the other to L2 on the top switch. COM on the first switch connects to COM on the second switch, L1 on the first switch connects to L1 on the second, and L2 on the first switch connects to L2 on the second.

Switch drops from a junction box There is a chance that if your house has these old wiring colours the switch drops may be from a loop-in-loop-out radial lighting circuit done with junction boxes rather than ceiling roses as shown in Fig 2. The switch wiring is all the same but the switch wire cable C leads up to a different set up. Fig 3: 3 way switching wired to a loop-in-loop-out radial lighting circuit done with junction boxes 2 way switch 3 wire system, new harmonised cable colours 2 way switching means having two or more switches in different locations to control one lamp.

Here we have a two way switching system that utilises two single gang two-way switches and a three wire control, shown in the new harmonised cable colours. If your circuit has the old cable colours see: Two-way switching 3 wire control, old colours Here we a have a schematic Fig 1 which makes it easy to visualise how this circuit works. Fig 1: Two way switching schematic wiring diagram 3 wire control The schematic is nice and simple to visualise the principal of how a two way switch works but is little help when it coms to actually wiring this up in real life!!

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## How a 2 Way Switch Wiring Works?

All the switches perform simple task of either interrupting the flow of electric current or divert the flow of current. All the switches we use regularly to turn on or off lights, fans, etc. So, before proceeding to learn about the wiring of a 2 way switch, we will learn about the Two-Way Light Switch, which is the main element of the 2 Way Switching, irrespective of the type of wiring used.

It is a standard single pole double throw switch with three terminals. This is in contrast to a regular two terminal switch, which is just a make or break device.

### Light Switch Wiring Guide: Both Single Pole, Two-Way & Dimmer.

The following image shows the front and back view of a typical household two-way switch. How to Wire a 2 Way Switch? As I have already mentioned in the introduction paragraph, a two way switch is very useful in staircase lighting as you can turn on the light just before you start to climb the stairs and once you reach upstairs, you can turn off the light simply by toggling the switch placed near the top of the staircase.

There are a couple of ways in which you can make a two-way switch connection. One is an older method, which is not often used now-a-days and the other is a more modern and safer version, which is being implemented in industrial as well as residential applications.

Let us take a look at both these wirings. The following is the simple schematic of a three-wire 2-Way Switch wiring.

## 2 gang 2 way light switch

You can observe in the schematic that both the COM terminals are connected together. The terminologies related to switches are different between the US and the UK. In the UK they refer to two-way switch and cross over switch. In the US they refer to a three-way switch and four-way switch. The US terminology used in this explanation. Let start with the basic idea of the light switch in an electric circuit.

The basic circuits of on and off the light is shown in the below figure. Now you need different kinds of switches called three-way switches probably because they have three contacts. In between the two switches, the two lines are called travelers. So now you can on and off the light by the first switch and the same for the second switch or you can on the light with the first switch and off with the second switch.

## thoughts on “Explanation for wiring diagram for double light switch”

1. Doushakar says:

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2. Bram says:

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