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UL Standards Update: Safety for Household and Similar Electrical Appliances – Part 2-40

The fourth edition of this Standard was published on Dec. 15, 2022 and includes several new updates.

Six outdoor air conditioning units in the backyard

November 29, 2023

The fourth edition of UL 60335-2-40, the Standard for Household and Similar Electrical Appliances - Safety - Part 2-40: Particular Requirements for Electrical Heat Pumps, Air-Conditioners and Dehumidifiers, was published on Dec. 15, 2022. This bi-national standard includes the following updates:  

  • Updated definition and test method for releasable charge with relation of refrigerant leaks into the occupiable space
  • Refinement of leak detection system requirements to accommodate various methods, increase robustness and reliability, and account for deviation and drift over the system lifecycle
  • Clarification of potential leak point definition and requirements, and leak sensor location requirements
  • New combined flame symbol markings for fire service identification
  • Leakage current requirements for permanently connected appliances 
  • Mechanical strength and vibration tests 
  • Safety shut-off valve requirements for limiting the releasable charge 
  • Audible alarm requirements 

For a more detailed summary of changes in this edition, you may refer to the webinar here.

These updated requirements will be mandatory for all new certifications of these products by UL Solutions after Jan. 1, 2025.

Special note: Because the previous Standard for these products, UL 1995, the Standard for Heating and Cooling Equipment, does not address refrigerants other than class A1, UL 1995 is no longer being maintained and will not be used for new certifications after Jan. 1, 2025. Products certified to UL 1995 before this date may be allowed to have continuing certification until Jan. 1, 2028, in alignment with the EPA’s allowed sell-through date.

Information on how to obtain a copy of the Standard and general information regarding the consensus process are available here.


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