ARSD 44:75:14:23. Emergency electric supply

Each facility shall have an emergency source of electric supply to provide electricity during an interruption of the normal electric supply. The source of emergency electric supply shall be an automatic emergency generating set when the normal service is supplied by one or more central station transmission lines, or an automatic generating set or a central station transmission line when the normal electric supply is generated on the premises. The required emergency generating set, including the prime mover and generator, shall be located on the premises. The emergency generator set shall be of sufficient kilowatt capacity to supply all lighting and power load demands of the emergency system.