I was replacing as outlet..when I disconnected it there were 3 wires being used RED, White and blue. none were connected to the ground so I checked another outlet on the same wall, and saw that only blue and white were being used, again nothing on the ground. White was on the top screw, on the ground side, and the blue was on the top screw on the other side...red was not connected on that outlet. not sure if I should connect the new outlet the same way using only the White and blue?...and leave off the Red? Im confused!!