The Blog

How To Install An External Power Supply

The job should be done professionally though, ensuring the outlet is safe and protected from the elements because water and electricity don't mix well.

The most important thing to keep in mind is that any changes to a power or light circuit outside of a property must meet IEE wiring regulations. These are in place to promote safety and protect inhabitants. It may also be wise to notify the local authority before you start work to ensure you can go ahead with the project.

One thing to make sure with every outdoor power supply is that they are suitably weatherproofed. The surface mounting box should feature seals that prevent moisture from getting in. There should be a cover for when the socket is not in use that also prevents water from reaching the connections. Some sockets also have a cover that provides protection even when the socket is in use.


Every outdoor power supply should also be fitted with a residual current device (RCD). These fast-acting switches trip off within a fraction of a second as soon as there is a leak on the earthing wire. This provides protection against potentially fatal electrical shocks.

The most suitable sockets for outdoor use are IP68 rated. This means they are protected against both dust and water. You should never use a socket that does not have an IP rating that says it is safe to use in the particular setting.

Generally you can wire an external power supply in the same way you would a normal spur. Simply run the cable from the junction box or another socket on the main circuit. Use a switched connection unit to boost safety. Attach the cable to the external socket you have fitted and everything should be ready to go.

An important thing to keep in mind is that frost can cause serious damage to cable insulation. As a result you should ensure that cables are not left exposed at any point, including during installation. This means you should always install the socket first and then connect it up straight away.

When fitting the power supply you will need to drill a hole in the wall for it to run through to reach the socket. Before doing this you need to check to make sure you won't hit any pipes or cables. A good tip is to drill with the bit angled slightly upwards; this will make it harder for any rainwater to ingress into the hole.

If your external socket is specifically for outdoor lights in the garden you may want to select a system that allows remote control. This will save you a lot of time and effort when it comes to switching on and off. It also means you avoid additional stresses on cables and wear on the socket itself.


Another thing you should consider when you install a power supply specifically for outdoor lighting is where you want to position it. Keep in mind the cabling for the lights will need to be run to it so you want it in an accessible location.

Your garden and gardening activities can be seriously improved by installing an external power supply. Just make sure the installation is done with care and to a professional standard. It you have any concerns, consult qualified electricians to get some help. Contact us today for further information. We would love to hear from you.

Back to Posts