It is the fourth edition of the standard, UL 60335-2-40, and provides particular requirements for electrical heat pumps, air-conditioners and dehumidifiers.
The fourth edition is intended for use in conjunction with the sixth edition of UL 60335-1, the Standard for Safety of Household and Similar Appliances, Part 1: General Requirements, dated October 31, 2016.
Some changes for the new edition of UL 60335-2-40 include in the areas of leakage current and electric strength at operating temperature and a new annex on refrigerant detection systems for flammable refrigerants.
The fourth edition of UL 60335-2-40 is scheduled for publication in November from UL Standards & Engagement, the company said.