Brian, If I understand you question, you are correct. IEC 60601-1 second edition does not address any voltages other than rms and DC. The draft third edition does address "peaks".
It is up to you and if applicable the test house, how to interpret what the rms value is. NOTE: you can interpolate. See recommendation 27. If you should have any questions or comments, please feel free to contact me. Sincerely, Ned Devine Entela, Inc. 3033 Madison Ave. SE Grand Rapids, MI 49548 Phone: 616 248 9671 Fax: 616 574 9752 e-mail: ndev...@entela.com www.entela.com Entela, Inc. A Certified Woman Owned Business From: Brian O'Connell [mailto:boconn...@t-yuden.com] Sent: Thursday, August 14, 2003 10:01 AM To: 'emc-p...@majordomo.ieee.org' Subject: RE: IE C60601-1 table 16 Sir Thanks for your reply. What clause in 601-1 provides this definition & determination of WV? I have already discerned what insulation class is being referred to, and which insulation class is required, as 601-1 clearly explains and diagrams (at least) this... Am I blind or is there no clause that defines WV (referred to as "reference" V in the standard) and if peak V shall be considered? thanks very much for everyone's advice. Brian -----Original Message----- From: FastWave [mailto:bi...@fastwave.com] Sent: Thursday, August 14, 2003 5:17 AM To: 'Brian O'Connell'; 'emc-p...@majordomo.ieee.org' Subject: RE: IE C60601-1 table 16 Brian, Working voltage is determined in the same manner as 950, 1010, etc. A special consideration is that you may have to consider the possibility of any patient connection being earthed. Table 16: The first row titled "equivalent to Basic insulation between parts of opposite polarity" is what 950 refers to as Operational insulation in the mains circuit = insulation that may protect from a Risk of Fire but not does not provide Risk of Shock protection. The second row is for Basic & Supplementary insulation. And the third row is for Double & Reinforced insulation. Each row is split to provide the creepage & the clearance requirement for each working voltage column. The weird letters in the second column (A-f, A-a1, etc.) relate to Appendix E in the back of the standard. Appendix E has diagrams showing what constitutes operational, basic, supplementary, reinforced, & double insulation. So if you are unsure if a particular creepage/clearance distance is considered o/b/s/r/d, you can use Appendix E. Just remember that the "601" standards do not use the term "operational" insulation. Regards, Bill Bisenius E.D.& D. bi...@productsafet.com www.productsafeT.com -----Original Message----- From: Brian O'Connell [mailto:boconn...@t-yuden.com] Sent: Wednesday, August 13, 2003 6:00 PM To: 'emc-p...@majordomo.ieee.org' Subject: IE C60601-1 table 16 Good People Would someone please provide relevant clause that explains how to use this table. Are the peak/dc and rms WV used seperately to determine clearance & creepage, as in 60950? or is the greater of the dc or ac WV used to determine both crp & clr ? Is the same measurement technique for determining WV as in 60950, 1010-1, etc ? thanks much Brian 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
