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Old 08-21-15, 10:41 AM   #3
stevehull
Steve Hull
 
Join Date: Dec 2012
Location: hilly, tree covered Arcadia, OK USA
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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?

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