Why is my kitchen socket sparking when I plug in my microwave – Advice from Electriman, North London Electricians

Seeing a spark when you plug your microwave in can be alarming, but it helps to understand what is actually happening before deciding how worried to be.

A very small, brief flash as you push the plug in is often nothing more than a tiny electrical arc caused by the circuit connecting under load. Microwaves draw a surge of current the moment they are plugged in, and that instant of connection can sometimes produce a faint spark. Many people never notice this with smaller appliances simply because the current surge is lower.

That said, there are situations where a spark is telling you something is genuinely wrong. You should take it seriously if you notice any of the following:

The spark is large, loud, or accompanied by a bang.

The spark happens every time without fail, or gets worse over time.

You can smell burning plastic or see scorch marks around the socket face or plug pins.

The socket feels warm or hot to the touch.

The microwave trips the circuit breaker or RCD.

What could be causing a more serious spark? The most common culprits are a worn or damaged socket where the internal contacts have become loose over years of use, a damaged plug on the microwave itself with bent or corroded pins, a loose connection inside the back box behind the socket, or a problem with the microwave drawing more current than it should.

What can you safely check yourself? First, switch the socket off at the wall and pull the plug out. Have

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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.