: Three flange bobbin construction with primaries and secondaries wound side by E side for low capacitive coupling. UL Class F Insulation System (155°C). Agency File: UL: File E65390, UL 5085-1 & 3 (1585), Class 2 not wet / Class 3 wet Transformer cUL: File E65390, UL 5085-1 & 3 (1585) For Canad.