Why is my neutral wire overheating – Advice from Electriman, North London Electricians

## Why Is My Neutral Wire Overheating? A Homeowner's Guide

Finding a warm or discoloured neutral wire is understandably alarming, and rightly so — it is a genuine fire hazard that needs prompt attention.

### What the neutral wire does

The neutral wire completes the electrical circuit, carrying current back to the supply. In a healthy installation it should carry roughly the same current as the live wire, and a well-made connection will barely warm up.

### Most common reasons it overheats

- **Loose or corroded terminal** — the most frequent cause. A poor connection creates resistance, and resistance turns electrical energy into heat.

- **Overloaded circuit** — too many appliances drawing more current than the cable was designed for.

- **Undersized neutral conductor** — occasionally found in older properties where wiring does not meet modern standards.

- **Shared or floating neutral** — in older ring-main wiring or where DIY work has been carried out, neutrals from different circuits can be incorrectly shared.

- **Three-phase imbalance** — in properties with a three-phase supply, an open-circuit neutral can force full phase-to-phase voltage onto equipment and cause severe overheating.

- **Harmonic loading** — modern electronic equipment (LED drivers, computers, variable-speed drives) can cause neutral currents to exceed line currents due to third-harmonic distortion.

### What you can safely check yourself

- **Smell burning

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