a receptacle doesn’t by
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itself tell you whether the wiring is correct.
What does the third hole on an outlet do?
It’s the grounding contact. On a properly grounded system, it connects compatible equipment to the equipment grounding path, which provides an important fault-current path and helps protect against electric shock.
Should the ground hole be on top or bottom?
Either orientation may be encountered. Follow the applicable electrical code, manufacturer instructions, and installation requirements
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