Why does my socket spark when I plug something in?
Quick answer
A small spark when plugging in an appliance is usually normal — it's static or inrush current. A large spark, burning smell, or repeated sparking means the socket needs replacing immediately.
🏠Homeowner view
A tiny flash when you push a plug into a socket is usually harmless — it's caused by the moment the circuit completes and current begins to flow (especially with appliances that have a motor or capacitor inside). This is more noticeable with older or worn sockets where the contacts are slightly loose. However, if the spark is large, loud, or accompanied by a burning smell or scorch marks, stop using that socket immediately and call an electrician. Repeated sparking indicates the socket's internal contacts are worn or arcing, which is a fire risk. Also, if a socket sparks and immediately trips your RCD or MCB, there may be a fault inside the appliance — try a different appliance first. Visually check the socket for any discolouration, melting, or burn marks. If you see any, don't use it.