Why is my socket getting dangerously hot when charging my phone overnight – Advice from Electriman, North London Electricians

Finding a hot socket is understandably alarming, and you are right to take it seriously. While phone chargers draw very little current compared to something like a kettle or washing machine, a socket in poor condition can overheat even under that small load. Here is what is likely happening and what you should do.

Why it gets hot

The most common reason is a loose terminal connection inside the socket faceplate. Over years of use, the screws that clamp the wires inside a socket can loosen slightly. When current passes through a loose joint, resistance increases and that resistance turns into heat. The problem is worst during long continuous use, which is exactly what overnight charging provides.

Other causes worth knowing about include corroded terminals, an overloaded extension lead plugged into that socket, a faulty charger or charging cable, or in older homes, deteriorated wiring behind the socket. Occasionally the socket itself has simply worn out internally, especially if it is more than 25 years old.

What you should do right now

1. Unplug the charger immediately.

2. Switch off that socket at the consumer unit if you know which breaker controls it.

3. Do not use the socket again until it has been checked.

4. Feel carefully around the socket faceplate for any scorch marks, discolouration, or a burning smell, but do not remove the faceplate yourself.

What you should not do

Do not attempt to open the socket yourself, e

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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.