Ron, The Mains to Applied part isolation (Sub-clause 20.2, category B-a) is typically achieved by selecting a power-supply that meets IEC 60601-1 requirement. This also helps meet Sub-clause 20.1, category A-a1 & A-a2 of the standard. Most medical grade Power-supplies will meet 4KV isolation, as well as the required creepage/clearance distances.
If you have "BF" applied part - you will need isolation at the Applied part as well. This is more trickier than isolating mains since you need to assure that your Applied part signals are not affected. This isolation is greater of the two - double insulation (dependent on the voltages on your applied part) or basic insulation (at 240 Volts) - which assumes that if another equipment with probes into the patient fails, you will be applying 240V to your applied part. Hope this helps. Thanks Dan Modi Asst. Director - Product Certification Alcon Surgical (Note: All opinions are personal, and do not reflect that of my employer). -----Original Message----- >From: [email protected] >[mailto:[email protected]]On Behalf Of Ron >Sent: Wednesday, August 29, 2001 11:26 AM >To: EMC >Subject: Medical application-Isolation voltage > > > >I have a medical application that requires "double insulation" from the >Mains to an "applied part" according to IEC60601. IEC60601 states that for >a reference voltage of 250v and double insulation, the test voltage is 4000v >for 1 min. I am assuming that the voltages are RMS values. > >How does one go about meeting the 4000v test when the highest rated ac-dc >converter I can find is 3500v RMS continuous. > >Any help is appreciated. > Thanks. > > > > >Ronald Cyprowski >Vascor Inc. >566 Alpha Drive >Pittsburgh PA 15238 >412-963-7438 x139 >[email protected] > > >------------------------------------------- >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. > > >------------------------------------------- >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. ------------------------------------------- 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.
