What is a split neutral fault and why did it cause all my appliances to fail – Advice from Electriman, North London Electricians

A split neutral fault is one of the more serious electrical faults that can affect a home, and it explains why multiple appliances can all stop working or get damaged at the same time, often without a single fuse blowing or a breaker tripping.

Here is what the neutral conductor actually does. Every circuit in your home has two main conductors: the live, which carries current to your appliances, and the neutral, which completes the circuit by returning that current. The neutral also acts as a voltage reference, keeping your supply stable at around 230 volts. If the neutral connection is broken or becomes very high resistance, that reference disappears.

When the neutral is lost or split, here is what can happen. Voltages on different circuits become unpredictable. Some appliances may see voltages well above 230 volts, sometimes approaching 400 volts. Others may see very low voltage or none at all. Lights might flicker or burn very brightly before failing. Motors in fridges, washing machines, and boilers can burn out. Sensitive electronics, smart TVs, computers, and routers can be destroyed almost instantly.

Where does this fault usually occur? The most common locations are a loose neutral terminal at the consumer unit main incomer, corrosion or damage in the meter tails, a fault in the service head supplied by your District Network Operator, or a problem on the DNO's supply cable itself, particularly common with older PME or

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.