A method and apparatus for transferring AC electrical power to a load from a first power source to a second power source provides for a time delay in the transfer to avoid problems associated with differences in the phases between the power sources. CT Contrast has typically had to be scraped and heated to be removed from floors and scanning equipment. A steering wheel return controller for applying a steering wheel return control signal to the steering assist command value is provided, thereby to execute the steering wheel return control only when the steering wheel returns. A data switch connects to the network bus, receives the superimposed signal, and sends the superimposed signal to one or more switch ports of the data switch.