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Old 08-21-15, 10:41 AM   #3
Steve Hull
Join Date: Dec 2012
Location: hilly, tree covered Arcadia, OK USA
Posts: 829
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Just observed something interesting. 30A receptacles have four prongs (hot, hot, neutral and ground) yet 50A receptacles have only three (hot, hot and neutral).

Why is this?

consulting on geothermal heating/cooling & rational energy use since 1990
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