No, residential electrical outlets are not normally supposed to produce large, visible, or prolonged sparks during standard use. However, a tiny, momentary micro-spark or faint blue flash can occasionally occur deep inside the receptacle slots the exact millisecond you plug in a high-draw appliance like a space heater, due to the sudden inrush of electrical current bridging the internal contact gap. Any spark that is loud, colorful, long-lasting, accompanied by a popping sound, or leaving black scorch marks is abnormal and dangerous. You can troubleshoot outlet safety easily by monitoring plug insertions. You can verify that your corrective action is successful when replacing worn receptacles eliminates abnormal sparking and ensures secure plug connections.
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