These requirements apply to the following stationary equipment for use in nonhazardous locations rated 7200 V or less, single- or 3-phase: Heat pumps, for heating and cooling; Air conditioners for cooling; Cooling portion and associated components of combination heating and cooling equipment; Liquid chillers; Condensing units; Add-on heat pumps for comfort heating or heating and cooling; Heat pump water heaters and refrigerant desuperheaters; Fan units and fan coil units for comfort heating and/or comfort cooling; Room fan heater units, central heating furnaces.