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 <http://www.productsafet.com/>
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
