I read in !emc-pstc that [email protected] wrote (in <117.79cc5a2.29233849@ aol.com>) about 'AW: Define Continuous DC Voltage', on Tue, 13 Nov 2001: >Could either of you clarify why a double insulated SELV circuit can not be >grounded? Is it a 60950 based or based on some other performance(?) based >requirements?
I think the original definition is in IEC60364, certainly not IEC60950, which says that its definition differs from that in IEC60364. The original idea, AIUI, was that a circuit that did not depend on earthing for continued safety was safer than one that required earthing. It seems that the consequences of a fault persisting undetected were not taken into account. There was a great deal of controversy over this matter some years ago, which seems to have stopped once PELV (SELV plus earthing) was introduced. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Eat mink and be dreary! ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
