Hello all, A) What is this group's sense with respect to the need for a UL Recognized Insulation System (UL 1446) in a transformer operating in excess of Class A (65 Deg/C Rise) conditions, when the power supply wherein this transformer resides is being submitted for evaluation in accordance with NRTL marking considerations. NOTE: (Class B or better rated materials will be used for building the transformer -- They just will not be part of a UL Recognized Insulation System).
B) My reading of the Harmonized UL/CSA standard, UL 1950 / CSA 22.2 No. 950, Third Edition, indicates that a component satisfying the relevant UL _or_ CSA component standard, can be used to satisfy the requirements of the harmonized standard. This rationale is derived from Paragraph 2.2.2 and the Annex P2 section addressing paragraph 2.2.2. Both UL 1446 and CSA 22.2 No. 0, General Requirements - CEC, Part 2 are referenced. To my knowledge, neither CSA (nor IEC 85) require the "systems" approach. C) Have I interpreted this correctly? ThanX, Art Michael A.E. Michael, Dir. of Engineering Product Safety Int'l 166 Congdon St. East, Middletown CT 06457-8061 U.S.A. Phone : (860) 344-1651 Fax : (860) 346-9066 Email : [email protected] Website: http://www.safetylink.com
