There is disclosed structure which overcomes the difficulties encountered with respect to mounting wiring devices such as a receptacle and/or a switch to a box and then attaching a wall plate. Some of the difficulties encountered are positioning the wiring devices to be in alignment with each other, locating the wiring devices to be parallel to each other, adjusting the spacing between the different devices to be equal and uniform and fixing all of the devices to be flat against the wall. These deficiencies are overcome by an alignment plate having a single centrally located opening sized to receive one of more wiring devices and a set of alignment pins for each wiring device. Each set of alignment pins on the alignment plate is located on a vertical axis which defines the center for a wiring device and each wiring device has openings for frictionally receiving and holding captive a set of alignment pins. The alignment pins accurately position, align and locate all of the wiring devices relative to each other. Thereafter the alignment plate and the wiring devices can attached to a box by means of mounting screws and a wall plate can then be positioned around the wiring devices without further adjustment.