The way most safety agencies look at this is that if all the materials used meet or exceed Class B requirements, then the transformer is Class B.
BTW UL1950/CSA950 requires components to meet the requirements of UL _and_ CSA (not _or_!). But nowhere in the standard does it say that any or all components must be UL and/or CSA certified. Any uncertified component may be used, as long as it is tested and/or examined to ensure compliance with the applicable standards. If you have a recognized insulation system, then this makes life easier; otherwise, surely the agency engineer should be capable of examining the materials used to ensure compliance. Just my personal opinion .... Egon Varju
