These requirements cover commercial refrigerators and freezers intended for connection to alternating-current circuits rated not greater than 600 volts.These requirements apply to unitary and remote commercial refrigerators and freezers. For the purposes of this standard@ commercial refrigerators and freezers include equipment@ such as display cases@ reach-in cabinets@ meat cases@ frozen food and merchandising cabinets@ beverage coolers@ beverage cooler-dispensers@ food service carts@ ice cream cabinets@ soda fountain units@ door panel assemblies and processing water coolers.Self-contained commercial refrigerators and freezers covered by these requirements employ hermetic refrigerant motor-compressors and air- and water-cooled condensers.These requirements do not apply to refrigeration systems such as those used in cold-storage rooms@ walk-in coolers@ and similar places@ that are fabricated in the field.Requirements for the installation of commercial refrigerators and freezers are included in the National Electrical Code@ ANSI/NFPA 70@ and the Safety Standard for Refrigeration Systems@ ASHRAE 15.