What is a split neutral fault and can it cause a house fire – Advice from Electriman, North London Electricians

A split neutral fault might sound technical, but the effects in your home can be very noticeable and potentially dangerous. Here is what you need to know in plain language.

What the neutral wire actually does

In your home's electrical system, every circuit has a live wire that brings power in and a neutral wire that returns it. The neutral wire is just as important as the live. If the neutral is interrupted or develops a high-resistance connection anywhere along its path, things go wrong quickly.

What a split neutral actually means

A split neutral fault is when the neutral conductor is broken, loose, or has developed a very high resistance at some point. The word split refers to the fault creating two separate sections of the neutral, neither of which is doing its job properly. This is particularly dangerous in a system fed from a three-phase supply, such as in a large property or a flat fed from shared supply cables.

What you might notice in your home

Some lights flickering or going very bright while others dim down unexpectedly.

Appliances behaving strangely, running too fast or too slow.

A burning smell near the consumer unit, a socket, or a fuse spur.

RCD or breakers tripping for no obvious reason.

Bulbs blowing frequently in one part of the house.

Can it cause a fire?

Yes, absolutely. A loose or broken neutral causes arcing at the fault point, and arcing generates intense heat that can ignite surrounding materials

Need a qualified electrician in North London?

Electriman covers Mill Hill, Barnet, Finchley, Edgware, Enfield, Watford and surrounding areas. All work is Part P certified and fully insured.