Why do some power outlets have T-shaped plugs? - Quora
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What is the purpose of power outlets with "T-shaped" holes? : r/answers
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Why do some power outlets have T-shaped plugs? - Quora
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Why do some power outlets have T-shaped plugs? - Quora
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Why do some receptacle outlets have a T-shaped hole?
T slot
File:NEMA 5-20RA GFCI Tamper Resistant Receptacle.jpg - Wikimedia Commons
Voltec 09-0T676 :: Temporary Power Box, U-Ground T-Slot :: PLATT ELECTRIC SUPPLY
ELECTRICAL RECEPTACLES - ppt download
