Quote:
Originally Posted by Refugee
In the UK setup 2-pin plugs will not go into 3-pin sockets.
If something is double insulated such as a wall wart then the earth pin is only needed to open the shutters and can be plastic.
In the US sockets can be two or three pin so it would be stupid to fit a three pin plug to a two core cable as it would restrict where unit could be used.
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The 1964 National Electrical Code required all new installations, residential, commercial and industrial to be earthed three prong receptacles for 120 volt single phase loads.