Transfer switches are critical components in the power system and they are tested to meet UL 1008: Standard for Safety – Transfer Switch Equipment. This course discusses some of the UL 1008 short-circuit testing and passing criteria and then demonstrates that high short-circuit and short-time withstand and closing rating help simplify the selection of overcurrent protection devices and enable selective coordination strategies. This course also touches on the differences between switchboards (UL 891) and switchgear (UL 1558).