What is this?
A plug that gets hot during use indicates that excessive heat is being generated, either within the plug itself, at the connection between the plug and socket, or from the appliance drawing too much current. UK three-pin plugs (BS 1363) are designed to handle up to 13A without significant heating, so a hot plug suggests something is wrong.
Common causes
- Loose wire connections inside the plug (live, neutral, or earth)
- Fuse in the plug is the wrong rating or is making poor contact
- Corroded or damaged plug pins not making good contact with the socket
- Appliance drawing more current than expected due to an internal fault
- Cheap or non-compliant plug not made to BS 1363 standard
- Socket internal contacts worn and not gripping the plug pins
Is it dangerous?
Yes. A hot plug means electrical energy is being converted to heat at a connection point where it should not be. This can melt the plug plastic, damage the socket, and in extreme cases cause a fire. If a plug is so hot you cannot comfortably hold it, stop using it immediately. A plug that smells of burning or shows discolouration must be replaced before the appliance is used again.
Can I fix it myself?
If you are competent to do so, you can inspect the inside of the plug. Turn off and unplug the appliance. Open the plug and check that the wires are properly stripped, firmly secured in the correct terminals, and that no bare wire is exposed. Check the fuse is the correct rating (3A for appliances up to 700W, 13A for higher loads). Ensure the cord grip is holding the cable, not the wires. If the plug pins are bent or discoloured, replace the plug entirely.
When to call an electrician
Call an electrician if you are not confident inspecting the plug yourself, if the plug pins are damaged or discoloured, if the problem persists after you have checked the plug, or if multiple appliances experience hot plugs in the same socket (indicating a socket problem).
What will an electrician do?
Inspect the plug connections and replace the plug if damaged
Check the socket for worn contacts that may not be gripping plug pins
Test the appliance current draw to check for internal faults
Replace the socket if it is causing overheating
Advise on correct fuse ratings for your appliances
Typical cost
£40 – £120
Plug replacement is inexpensive. If the socket also needs replacing, costs are slightly higher. Appliance testing may incur an additional fee.
