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2-Way Lighting Using LightwaveRF Dimmers

One of the things that confuses people the most is installing home automation into an existing 2-Way lighting system. This application note looks at how a LightwaveRF Dimmer switch and slave can be installed to control a 2-way lighting system.

Firstly, what do we mean by 2-way lighting?

This simply refers to a lighting system where one light is controlled by two light switches. Examples of this are where a room has two entrances (each needs a light switch) or for a hall light that can be controlled from the hall and the upstairs landing.

Standard 2-Way Wiring

Application Note 2-way WiringFigure 1: A standard 2-Way Wiring System.

A 2-core cable (brown and blue) carries the Live and Switched Live to the wall switch and up to the light fitting. An extra 3-core cable (brown, black and grey) connects the two wall switches together; enabling each of them to independently turn the light On or Off.
Note: in some installations two 2-core cables may have been used to connect the switches together, if this is the case the individual cables will be brown and blue rather than brown, black, and grey.

LightwaveRF Dimmer Switch and Slave

Two install a LightwaveRF solution into a 2-way system you need to replace one switch with a LightwaveRF 1-gang dimmer (Master) and the second switch with a LightwaveRF Slave Dimmer as shown in Figure 2.

2-Way Wiring On/Off Control with the LightwaveRF 1-gang Dimmer and Slave switchesFigure 2: 2-Way Wiring On/Off Control with the LightwaveRF 1-gang Dimmer and Slave.

This circuit uses a low-voltage (12V) signal wire running between the 'S' terminals of the Dimmer (Master) and the Slave Dimmer - shown as a grey wire in Figure 2.

This configuration will give us 2-Way On/Off and dim/brightness control of the light.

3-Way and Multi-Way Wiring

A 3-way wiring system can be created by installing an additional LightwaveRF Slave Dimmer to the circuit. In fact up to six LightwaveRF Slave Dimmers can be 'daisy-chained' together to create a multi-way lighting system.

3-Way Wiring with the LightwaveRF Dimmer and SlavesFigure 3: 3-Way and Multi-Way wiring with the LightwaveRF 1-gang Dimmer and Slaves.

Multi-Gang Slaves

One final note on using LightwaveRF Slaves. Often you will have 2-gang switches as part of the 2-way circuit. LightwaveRF have a small range of slaves to cover most installations:

3-Way Wiring with the LightwaveRF Dimmer and SlavesFigure 4: LightwaveRF Multi-Gang Slaves.


Installing the LightwaveRF Dimmer involves working with 230V mains wiring. If you are not comfortable doing this you should consult a qualified electrician. This application note is provided as a guide, all work is are carried out at your own risk. Vesternet do not accept any responsibility or liability.

Related Information

Copyright Vesternet 2015

Updated: 04/02/2015

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