Why is my electrical panel showing signs of burning plastic smell when it is cold – Advice from Electriman, North London Electricians

A burning plastic smell coming from your consumer unit or fuse board is never something to ignore, and the fact that it happens or worsens in cold weather gives us an important clue about what might be going wrong.

Why cold weather makes it worse

Electrical connections are made from metal, and metal contracts when temperatures drop. If any connections inside your panel are already slightly loose, the cold makes them contract further, creating tiny gaps. Electricity trying to pass through a poor connection generates heat, and that heat is what burns the plastic insulation around wires and components. You may notice the smell more on cold mornings or after a cold night for exactly this reason.

What could be causing it

The most common causes include loose or corroded terminal connections on circuit breakers or the main isolator, a circuit breaker that is beginning to fail internally, overloaded circuits where cables are running hotter than they should, damaged or degraded cable insulation inside or near the panel, and in older properties, a consumer unit that is simply past its safe working life.

What you should do right now

Do not open the consumer unit yourself. The internal components carry live voltages that can be lethal even with the main switch off. Do not ignore the smell hoping it will go away. Do not reset any tripped breakers without understanding why they tripped. If the smell is strong, you see scorch marks, or

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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.