Hi Dave:
EN60950-1 is not equal to SELV. Certifications and reports do not necessarily indicate outputs are SELV, although careful reading of the test results can conclude that the outputs are SELV or not. Not all outputs of EN60950-1 power supplies are SELV and need not be. The power supplies are nevertheless EN60950-1 power supplies. The requirement for SELV is whether or not the circuit is accessible. Accessible circuits must be SELV. To perform a single-fault test, one must understand how the circuits operate, and what faults could cause the output to possibly exceed SELV limits. In today's power supply topology, such circuit analysis is not necessarily straight-forward. Your statement "Therefore my contention is it cannot be assumed that a power supply listed as EN 60950-1 compliant on a manufacturer's data sheet is also SELV compliant unless explicitly stated so or proven in the test report results." is correct. Best regards, Rich - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
