What this usually means
Treat a burning or fishy plastic smell near electrical equipment as urgent. Stop using the circuit, do not open the device or panel, and if there is smoke, visible arcing, heat you can feel through a cover, or scorching, leave the area and call emergency services. A burning smell means something is already overheating.
The common causes
An electrician works through 5 conditions that all produce a burning smell from an outlet or panel. They are listed so you can describe what you are seeing accurately — not so you can decide which one applies, because several of them look identical from outside the equipment.
- Overheating termination — A loose connection heating the device and surrounding insulation. The most common source of this smell.
- Overloaded circuit or extension lead — Sustained current above the rating heating conductors or a cord.
- Failing device — A receptacle, switch, breaker or fixture breaking down internally.
- Damaged conductor insulation — Insulation degraded by heat, age, rodents or physical damage.
- Failing appliance — The smell can originate in the plugged-in equipment rather than the wiring.
What to note before you call
For this symptom specifically, 4 observations do most of the work. Note them from a safe distance and do not open anything to check. Having them ready turns a vague call into a productive one and shortens the diagnostic visit.
- Where the smell is strongest and when it started
- Any smoke, buzzing, crackling, heat or discolouration
- Which circuit or room is involved
- Whether it followed new equipment or building work
What happens next
An electrician tests the circuit, isolates the cause and explains what the repair involves before doing it. Where this points at urgent electrical help, that page covers what the work usually includes and what changes the scope.