Abstract: An electric outlet includes a casing having a longitudinal row of split bolts on the middle and two longitudinal row of locating blocks at two opposite sides of the split bolts, a grounding strip and two metal conductive strips respectively fastened to the longitudinal row of split bolts and the longitudinal rows of the locating block and respectively connected to the conductors of the three wires of a three-wire electric wire, a plurality of rotary socket bodies respectively and rotatably mounted on the split bolts, each rotary socket body having insertion slots for receiving the metal blade and grounding prong of an electric plug, and a cover shell covered on the casing to hold the rotary socket bodies in place, wherein when an electric plug is installed in one rotary socket body, the rotary socket body can be rotated on the respective split bolt between "ON" and "OFF" positions.