Why is my socket arcing inside the wall – Advice from Electriman, North London Electricians

What Does Arcing Inside a Socket Mean?

If you have seen a flash of light, heard a crackling or buzzing sound, or noticed a burning smell coming from behind your socket faceplate, your socket is arcing internally. This means electrical current is jumping across a gap rather than flowing safely through a complete circuit — similar to a tiny lightning bolt happening inside your wall.

This is a serious electrical fault and a potential fire hazard. Stop using the socket immediately.

Most Common Causes

Loose terminal screws — the most frequent cause; wires work loose over time due to thermal expansion and contraction

Damaged or frayed cable insulation — the plastic sleeve protecting the wire has worn away, allowing current to jump

Overloaded socket — drawing more current than the wiring can safely handle causes heat and eventual arcing

Old or worn socket — sockets degrade over years of use, and internal contacts can corrode or weaken

Water ingress — moisture behind the socket can cause tracking and arcing between terminals

Poor original installation — cables not properly stripped or clamped at the time of fitting

What You Can Safely Do Right Now

Switch off the circuit at your consumer unit (fuse box) — look for the circuit breaker labelled 'sockets' or 'ring main'

If you are unsure which circuit it is, switch off the main switch entirely

Do not remove the f

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.