At what temperature should my consumer unit be before I turn everything off and call for help – Advice from Electriman, North London Electricians

Your consumer unit, sometimes called a fuse box, should feel barely warm to the touch during everyday use. A slight warmth is completely normal because electrical current always produces a small amount of heat as it passes through connections and components. What is not normal is a unit that feels hot, smells of burning, shows any discolouration, or makes crackling or buzzing sounds.

As a rough guide for homeowners, here is what different temperature levels mean in plain terms.

Up to around 40°C (feels slightly warm to the back of your hand): This is normal operating temperature and nothing to worry about.

Around 40°C to 60°C (feels noticeably warm or uncomfortable to touch): This is a warning sign. Something is causing excess heat. Common causes include a loose terminal connection, an overloaded circuit, or a failing RCD or breaker. You should stop using high-load appliances, note which circuits feel warmest, and book an electrician to inspect it soon.

Above 60°C (too hot to keep your hand on for more than a second or two): This is a serious situation. Switch off the main incomer switch at the consumer unit if it is safe to reach, do not touch any individual breakers, and call a registered electrician immediately. If you see smoke, discolouration, or smell burning plastic or a sharp acrid odour, treat this as a potential fire emergency, get everyone out of the property, and call 999.

A few things you can check safely fro

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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.