A wall plug socket typically sparks due to electrical short circuits, loose terminal wire connections, or normal micro-arcing during appliance connection. When you plug in a high-draw device, a brief spark can occur as current bridges the internal contact gap. However, large or persistent sparks usually indicate loose terminal screws creating high electrical resistance, frayed appliance power cords, or moisture ingress inside the junction box bridging hot and neutral contacts. You can troubleshoot electrical faults safely by shutting off the circuit breaker. You can verify that your corrective action is successful when tightening loose terminal wires, replacing damaged appliance cords, or installing a new receptacle stops abnormal sparking completely.
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