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I was doing electrical construction work when the ground was added to the receptacle or at least when it gained wide spread usage. The debate started immediately. Electrical Construction and Maintenance, a trade magazine, did a series of test to determine which position was better, up or down. The article concluded, by a miniscule amount, that if there was a better way, it was ground up.

Back then, all ground fault receptacles were labeled on the device in such a way that it had to mounted ground up or the writing (Test and Reset) on the receptacle would have been upside down. That's not the case anymore.

The vast majority are mounted ground down.
 
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