Yet another reason why I do not like this standard. And yes, 'external circuits' is on my list. In particular, 61010-1 says something really stupid:
"the RATING of the insulation of external circuits, appropriate for SINGLE FAULT CONDITIONS, if such circuits are nowhere ACCESSIBLE" For background, none of the IEC versions of the major safety standards(950, 65, 335, 601) address the concept of "external circuits" - probably because this is dependent on the conditions of acceptibility for the unit and the local electric code. This is amplified in UL60950-1, Anx NAE, where it says that external cabling must comply with NEC. And some standards are specific about it; e.g., IEC61558-1 says "This standard does not apply to external circuits and their components connected to terminals or socket-outlets of the transformer." FWIW, UL60065 mentions an 'external circuit', but only in reference to the suitability of terminals to the intended end use. To be fair to the writers of 61010, equipment under this standard is more likely to get connected to stuff that is in an OV category it was not designed for, so they probably have a very broad view of "foreseeable misuse". I thought it was not legal to mentor young engineers in America. Should I contact the DHS ? luck, Brian From: [email protected] [mailto:[email protected]]On Behalf Of Doug Kramer Sent: Thursday, October 02, 2008 12:11 PM To: [email protected] Subject: 61010-1 External Circuits A discussion at work today has flummoxed us in logic loop: What is the definition of "external circuit" as used in Section 6.6 of 61010-1? Please cite a source. This came up in training a young engineer in product evaluation of a device with relays that can be used to control a circuit or device external to the unit under evaluation. Thanks, Doug - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
