The in cable supplies power from the previous light or consumer unit. Lets assume the load you are controlling is a light.
How To Wire Two Way Light Switch Two Way Lighting Circuit
2 way lighting circuit loop at switch. There are different ways to connect up two way lighting circuits if it is a new installation the ideal way is to use a three core earth cable between the two light switches. When i say 2 way swithces i mean a switch with two copper screws. 1 look at diagrams of 2 way switching when the loop circuit runs through the ceiling and only the phase goes to and from the switch network. The principle is exactly the same as when looping at the ceiling rose or using a junction box. Logically it cant be done as both switches would need to be on for the circuit to work power the bulb that is but a two way switch system means that either switch should be able to turn on the bulb. Use two 2 way switches to create a two way switch system.
3 think how little it changes if neutral also goes to and from the switch network. Two way light switch using 3 core cable. The electricity flows from the hot wire black through the 2 way switch shown in off position and then to the light and returns through the neutral wire white. The switch wiring is all the same but the switch wire cable c leads up to a different set up. 2 see how it works. 4 wonder why you couldnt work that out yourself.
The twin and earth switch cable has been replaced with a 3 core and earth cable. 2 way light switch wiring 3 wire. If you are doing a new install or replacing a two way switch system go for the three wire control method. By wiring a 2 way switch the circuit below shows the basic concept of electricity flow to the load. Loop at the switch. You are most likely to see this 2 way lighting circuit in an industrialcommercial setting where the installation is trunkingconduit based and single core conductors are used.
Two way light switching schematic using a two wire control. Lighting circuits loop at the switch. This is a loop in method which can be useful where the light fitting only has three terminals or when using downlighters. 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. Connect a new cable to the switch to provide power to the new light fitting. Replace the one gang switch with a two gang switch.
This is a completed circuit. At the ceiling rose brown connects to loop as before black is now the switched line and the third grey wire is connected to.
Gallery of 2 Way Lighting Circuit Loop At Switch
