These requirements cover self-contained@ refrigerated vending machines intended for connection to alternating-current circuits rated 600 volts or less and which incorporate refrigeration systems of the air-cooled or water-cooled type employing hermetic refrigerant motor-compressors. These requirements do not cover vending machines incorporating universal motors rated at more than 250 volts@ nor vending machines which have a principal function other than storage and dispensing of refrigerated products; nor to vending stations@ that is@ freestanding stationary structures for outdoor use.