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If the device you are plugging in is "live" then current tries to flow as soon as the metal prong from the plug touches metal on the receptacle. If for example you plug in a lamp that is turned off it won't spark. Turn the same light on first and plug it in and it will likely spark. What is happening is that the act of plugging something in isn't a perfect mechanical process. The metal makes contact here and there and is typically not decisive. If you position the plug straight on to the receptacle and shove it in quickly the spark will be minimized. Best way is to have the device turned off when plugging it in.

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Q: Why does your outlet spark when you insert a plug?
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