![]() Switched Live is only live when the switch is on (this is where it gets its name from). The blue wire is known as the Switched Live and takes power to the light. The brown wire is Live (also know as permanent live), this brings the live supply to the switch. But for the sake of simplicity we ignore the Earth wire when explaining wiring as it plays no active role in the day-to-day workings of your light circuits.Ī 2-wire system includes two wires - Live and Switched Live.įigure 1: A standard 2-wire lighting System.Ī standard 2-wire lighting circuit is shown in Figure 1. The Earth is a very important part of the electrical system and all switches, appliances and lights must be correctly earthed. However, the third wire, which typically has a green/yellow sleeve is the Earth wire. The term is slightly confusing as the system will actually include three wires. This is the most common lighting system in Europe, almost all homes use this system, especially in the UK and Nordic regions. The simple explanation is that a 2-wire system does not include a Neutral wire at the light switch, the 3-wire system does include the Neutral at the switch. This application note explains the difference between 2-wire and 3-wire lighting systems and helps you understand which version you have in your installation.įirstly, what do we mean by 2-wire and 3-wire systems. This is an important point as many products, such as relays, cannot work if installed into a 2-wire system. You'll often see us refer to 2-wire and 3-wire lighting systems.
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