Generator Changeover Switch Wiring Diagram Ireland

By | December 3, 2017



An Essential Guide To Generator Changeover Switch Wiring Diagram Ireland



Installing a generator changeover switch, or transfer switch, is a crucial step in ensuring the safe and reliable operation of any generator. The switch ensures that only one power source – either the utility company or the generator – is connected to the main service panel at any given time. It also helps protect the generator from potential overloads, which can occur when the main power source is interrupted and the generator is suddenly running all home appliances at once. In this article, we’ll explore what a generator changeover switch is, its wiring diagram in Ireland, and the important safety precautions that must be taken before taking on any electrical wiring project.

Understanding Generator Changeover Switch Wiring Diagram Ireland



A generator changeover switch or transfer switch allows you to easily and quickly switch between the AC mains supply and a backup generator in emergency situations. This type of switch is indispensable in emergency situations, such as a power outage. Moreover, they provide the peace of mind that comes with the assurance that your home or office will be powered without interruption should a blackout occur.

Generator changeover switches, also known as transfer switches, are somewhat complex to install, and a professional electrician is recommended for the task. However, it is worth taking the time to understand how they work and their wiring diagram, as it helps determine if the generator is safe for use.

In Ireland, there are two standard wiring diagrams for generator changeover switches; 6-wire and 4-wire systems. Although similar, each configuration has its own unique set of wiring requirements and components.

6-Wire System Wiring Diagram Ireland



A 6-wire system is an electrical switching device that allows an effective electrical connection from both a live low voltage and neutral AC power source to a generator. On the transfer switch, it has three terminals labeled Line 1, Neutral and Line 2, plus an earth connection. The terminals also have assigned colors for easy differentiation: Line 1 is brown, Neutral white, and Line 2 blue.

The wiring diagram for a 6-wire system is represented in the table below:


















Component Color
Line 1 Brown
Neutral White
Line 2 Blue


The 6-wire system requires a 3-way switch, which is composed of a Line 1 live to the Line 1 terminal in the transfer switch, a Line 2 live to the Line 2 terminal and a Neutral connection to the Neutral terminal. Connecting Line 1 live needs to be switched off beforehand for safety reasons.

4-Wire System Wiring Diagram Ireland



The 4-wire wiring diagram is a bit more complex than the 6-wire system, but provides an effective connection to the generator, without the need for a switched connection. The four wires connecting the switch to the generator are labeled: Line 1, Neutral, Auxiliary and Ground.

The wiring diagram for a 4-wire system is represented in the table below:






















Component Color
Line 1 Brown
Neutral White
Auxiliary Blue
Ground Green/Yellow



The 4-wire system requires two separate connections: a Line 1 connection to the Line 1 terminal, and a Neutral connection to the Neutral terminal. In addition, there must also be a ground wire connected to the transfer switch’s earth terminal. The Auxiliary connection is not required but can help increase the efficiency of the connection.

Safety Requirements When Installing A Generator Changeover Switch



When installing a generator changeover switch in Ireland, a few important safety requirements must be followed. These include:


  • Ensuring the power supply is switched off and disconnected from the circuit.

  • Checking that the wiring connections are correct before turning the power back on and testing the voltage by using a multimeter.

  • Checking the ground fault protection to ensure it is working properly.

  • Never attempt to install the switch without verifying all connections.



Finally, always ensure that the switch is installed in a place where it is easily accessible in the event of a power outage.

Installing a generator changeover switch is vital for safe and reliable operation of any generator system in Ireland. Seeing that understanding the wiring diagrams and taking the right safety measures is essential, it is best to get the assistance of a professionally trained electrician. With their expertise, you can rest assured that your generator is connected correctly and safely so that you don’t have to worry about any interruption during a power outage.


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