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The NEC doesn't specify. Generally they are installed vertically with the ground on bottom.

In the world that I work in the ground is always installed on top. This is so if a gap exists between an outlet and the plug, anything falling into the gap hits the ground first and not across the hot and neutral wires simultaneously. Expanding on this premise an outlet installed horizontally with the neutral on top is the most safe installation. But I have never seen this done.

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12y ago

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Q: Are receptacles installed horizontally or vertically?
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