Outlet sparks when plugging something in

Symptoms

• Visible spark or flash when inserting or removing a plug
• Popping or crackling sound from the outlet
• Scorch marks or melted plastic around the slots

Likely causes

• CommonWorn contacts inside the outletYears of plugging and unplugging loosen the metal contacts, causing arcing.
• CommonA loose or damaged wire connectionA loose hot or neutral wire arcs against the outlet body when current flows.
• PossibleA faulty plug or damaged appliance cordExposed or bent prongs can arc as they make contact.
• PossibleMoisture inside the outlet boxWater intrusion can cause visible sparking, especially outdoors.
• Less commonOverloaded or failing circuit wiringDamaged insulation deeper in the circuit can show up as sparking at the outlet.

What to do

1. Stop plugging anything into that outlet immediately.
2. Turn off the breaker for that circuit at the panel.
3. Inspect the plug you were using for bent, blackened, or corroded prongs.
4. Look at the outlet slots for scorch marks, melted plastic, or a burning smell.
5. Do not attempt to open or test the outlet yourself if you saw a large spark or smell burning.
6. Leave the breaker off and avoid using the outlet until a licensed electrician inspects it.
7. If the sparking was small and only on an old, worn plug, try a different device before deciding the outlet itself is bad.

Tools and parts

• Non-contact voltage tester

When to call a pro

Call a licensed electrician any time an outlet sparks more than a tiny, one-time flash, especially if you see scorch marks or smell burning.

Safety