Do you know what UL standards are related to transformers?
UL50--Enclosures for Electrical Equipment, Non-Environmental Considerations (Ed. 13 Oct.16.2015)
UL50E--Enclosures for Electrical Equipment, Environmental Considerations (Ed. 3 Oct 15 2020)
UL379--Power Units for Fountain, Swimming Pool, and Spa Luminaires (Ed.1 Jun.19.2013)
UL506--Specialty Transformers (Ed.14 Jun.2.2017)
UL508--Standard for Industrial Control Equipment (Ed. 18 Mar.30 2018)