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Hello Zhang Guoqing. The IEC60417-1, Symbol 5017 is the appropriate symbol for marking the supplemental earthing terminal, if marked at all, even if it's a more solid and reliable earthing means (it's usually hard wired). IEC60417-1, Symbol 5019, is only allowed at the main PE terminal, which must be in the appliance inlet for Pluggable Equipment Type A with a detachable power supply cord. Regards, Peter L. Tarver, PE [email protected] > From: Zhang Guoqing > Sent: Monday, May 31, 2004 9:29 PM > > Hi, > I have a question on UL60950-1, > > in clause 2.6.4.2: > "Equipment required to have protective earthing > shall have a main protective earthing > terminal.For equipment with a DETACHABLE POWER > SUPPLY CORD, the earthing terminal in the > appliance inlet is regarded as the main > protective earthing terminal." > > in clause 2.3.2 > "- for PLUGGABLE EQUIPMENT TYPE A, a separate > protective earthing terminal shall be > provided in addition to the main protective > earthing terminal, if any (see 2.6.4.1)." > > My questions is how to mark the separate > protective earthing terminal, do you think the > symbol 60417-1-IEC-5019 is correct? > > For some equipment(for example, telecommunication > centre equipment), seperate earthing terminal in > the equipment may be a better way for connecting > earth than earthing terminal in the appliance inlet. > So my question is, if seperate earthing terminal > is not required only from the standards > UL60950-1, do you think the equipment which > provide one seperate earthing terminal and > indicated by symbol 60417-1-IEC-5019 do not > comply with UL60950-1? > > Zhang Guoqing > Huawei Technologies CO.,LTD. P.R. CHINA This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. IEEE PSES Main Website: http://www.ieee-pses.org/ To post a message send your e-mail to [email protected] Instructions for use of the list server: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Ron Pickard: [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: http://www.ieeecommunities.org/emc-pstc
