This is the common CSA and UL standard for low voltage transformers. It is the first edition of CSA C22.2
No. 66.2 and the first edition of UL 5085-2. This edition of CSA C22.2 No. 66.2 supersedes the
requirements of CSA C22.2 No. 66 published in 1988.
CSA C22.2 No.66.2-06-2006 history
2006CSA C22.2 No.66.2-06-2006 Low Voltage Transformers - Part 2: General Purpose Transformers First Edition [: CSA C22.2 NO 66-1988]