Symptoms
- Cord is warm or hot to the touch along its length
- Plastic insulation feels soft or smells slightly of plastic
- Cord is thin, long, or coiled while in use
Likely causes
- CommonCord gauge too thin for the loadLight-duty cords aren't rated for high-draw devices like space heaters or power tools.
- CommonCord left coiled while under loadA coiled cord traps heat and can't dissipate it as well as one laid out straight.
- PossibleUsing it for a long-term or permanent connectionExtension cords are meant for temporary use, not as permanent wiring.
- PossibleDamaged insulation causing partial shortingCracked or worn cords can develop hot spots.
What to do
- Unplug the cord immediately if it's noticeably hot.
- Uncoil the cord fully and let both it and the plugged-in device cool before reuse.
- Check the cord's amperage rating against the device's draw; heavier tools and heaters need a heavy-duty cord.
- Inspect the full length for cracks, fraying, or discoloration.
- Never run a space heater or high-draw tool on a thin, light-duty extension cord.
- Replace any cord that overheated or shows damage rather than continuing to use it.
- For anything needing power regularly, have an outlet installed in that location instead of relying on an extension cord.
Tools and parts
Heavy-duty extension cordSearch: “12 gauge heavy duty extension cord”
When to call a pro
If you regularly need power somewhere with no nearby outlet, have an electrician add a proper outlet rather than relying on extension cords.
Safety
Use caution
A hot extension cord is a fire hazard. Unplug it, let it cool, and don't use damaged or undersized cords for heaters or power tools.