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UL 427
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UL 427 5th Edition, February 10, 2017 UL Standard for Safety Refrigerating Units
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Description / Abstract:
These requirements cover refrigerating units intended for connection in accordance with the National Electrical Code, NFPA 70, to alternating-current (ac) circuits rated not greater than 600 volts.
This standard also covers component refrigeration systems (self-contained mechanical refrigeration systems), not already covered by a UL standard, that heat, cool or dehumidify as integral (not stand-alone) components of appliances.
Refrigerating units covered by these requirements employ sealed, hermetic-type motor compressors, and air- or water-cooled condensers.
These requirements do not cover equipment intended for comfort cooling.
This standard also covers component refrigeration systems (self-contained mechanical refrigeration systems), not already covered by a UL standard, that heat, cool or dehumidify as integral (not stand-alone) components of appliances.
Refrigerating units covered by these requirements employ sealed, hermetic-type motor compressors, and air- or water-cooled condensers.
These requirements do not cover equipment intended for comfort cooling.