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in the olden days, electrical engineers figured if you drop razorblade or pin between the receptacle and the plug, the metal will get in contact with the ground prong thus minimizing the chance of energizing a metal object. this is why most outlets in schools and hospitals are installed ' upside down". nowadays we install them 'downside up' to see a smiling face. ha ha.

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Q: Why are my 3 prong outlet installed upside down?
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