A brief, faint blue flash or micro-spark inside a wall outlet when you plug in an appliance is often a normal occurrence caused by the sudden inrush of electrical current bridging the internal contact gap, especially with high-wattage devices like space heaters. However, if the blue spark is large, loud, accompanied by a snapping sound, or leaves black scorch marks on the plastic faceplate, it indicates a serious problem such as worn internal contact springs or a loose terminal wire. You can troubleshoot outlet wear easily. You can verify that your corrective action is successful when replacing an old, loose receptacle with a new tamper-resistant outlet eliminates abnormal blue arcing flashes.
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