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Actually, for lamp cord, the ribbed side is Neutral/White. If uncertain, look at the polarized plug. The wider blade is Neutral and should be connected to the ribbed wire. The narrower blade is Hot and should be connected to the smooth wire. Typically, there is lettering on the smooth side identifying the type of wire it is.
3W 4'x4' Arduino Laser Cutter/Engraver
What Would Escher Do?