UL has announced a revision to the UL 44 standard. UL 44 is the standard for thermoset-insulated wires and cables. It can be purchased on the UL website.
“This Standard specifies the requirements for single-conductor and multiple-conductor thermoset-insulated wires and cables rated 600 V, 1000 V, 2000 V, and 5000 V, for use in accordance with the rules of the Canadian Electrical Code CE Code Part I, CSA C22.1, in Canada, Standard for Electrical Installations, NOM-001-SEDE, in Mexico, and the National Electrical Code (NEC), NFPA-70, in the United States of America. See Annex a for the complete list of types covered by this Standard and the specific electrical codes for which they are intended, and Annex b for a summary of construction and test requirements for these types.”
*Description from the UL website