Once again my question was what is the harm in using a two wire (indoor cord) when every set of Christmas lights is only a two wire set up. If there is a problem with the strand of lights if the neutral/ground is faulty, even if it is plugged into a grounded 3 wire cord, you will still get zapped. The third ground wire will not come into play.
Birchwood Gardens Landscaping - Full Service Landscaping
Elves and Company - Holiday Decorating