[mikethedruid]

   Also use polarized  PLUG,,,,fat plated Plug

Yes, the wider blade goes to ground, and, by UL convention should be connected to the ribbed or white wire in the cord. The narrow blade goes to the smooth insulated, or black wire. The wide blade is the grounded side of the line voltage, the narrow blade goes to the hot side. Of course, this assumes the house wiring is done correctly, which it isn't always.