No, you should not normally see large, bright, or loud sparks when plugging an appliance into a wall outlet during standard daily use. While a tiny, momentary microscopic flash can occasionally occur deep inside the receptacle slots the exact millisecond a high-wattage device bridges the internal contact gap, any visible spark that is bright, long-lasting, accompanied by a popping sound, or leaving black scorch marks is abnormal and dangerous. You can troubleshoot outlet wear easily by monitoring plug insertions. You can verify that your corrective action is successful when replacing an old, loose receptacle with a new tamper-resistant outlet eliminates abnormal arcing flashes and ensures secure internal contact pressure.
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