The vast majority of the worlds population take street lights for granted - in most cases not even knowing that they are there. But a common query is, how are street lights connected?
You can be forgiven to think that all street lights are supplied the same and this surely means the cables supplying them are the same also. However, it is common for street lights to be fed either by a private supply (local authority supply) or a DNO supply (Distribution Network Operator).
In this post we look at the various ways the humble street light is powered:
DNO - Distribution Network Operators
A street light can be connected to the DNOs mains electricity cable - the same cable that could be supplying your property. Effectively they joint onto one of the mains cables and connect it to the street light.
These supplies are considered unmetered supplies - this is because the supply cannot be metered as this would be uneconomical to provide a meter in every street light - to track energy use the DNOs are provided with an UMSUG code for the street light - you can learn more about UMSUG codes here.
The cabling for this type of connection is typically concentric - a cable that has one core with the neutral and earth combined surrounding the inner core.
Private Supply - Local Authority
In some areas street lights are powered by a