(57) An electric plug of a type for domestic use consists of a body portion (1) and an insert portion (2) which is enterable into a recess (3) within the body portion (1), the insert portion (2) being adapted for having the conductors of a cable assembled thereto as a first step in the connection of the plug to the cable and then being insertable into the recess (3) where insulation-piercing pins (5) make contact with the cable conductors to complete the connection. The plug body (1) has a projection (7) which is externally screw-threaded and co- operates with an internally screw-threaded drive nut (10) in providing a mechanical advantage to facilitate manual insertion of the insert portion (2) into the recess (3). The plug has the advantage of being connectable to a cable entirely without need for use of any tools.