If there is a possibility of voltage backfeed from sources of cogeneration or from the secondary system (for example, backfeed from more than one energized phase feeding a common load), the requirements of WAC 296-45-325 apply if the lines or equipment are to be worked as energized, and the requirements of WAC 296-45-335 and 296-45-345 apply if the lines or equipment are to be worked as deenergized.