Hi Brian:
1. IEC 61010-1 references IEC 60990 for leakage current tests. The test you describe (MD connected to L1) is NOT in 60990. 2. The PE and N (“grounded” conductor) are connected together at the electrical service entrance to the building and connected to a ground rod. This means the N is “accessible” because ground is accessible. 3. When the MD is connected to the chassis and to L1, the indicated leakage current should be zero, or near zero. This is not a useful test. (Maybe the lab is using an isolating transformer with an ungrounded output to supply the EUT; if this is the case, then the L1 and N leakage current measurements are valid although not in compliance with 60990.) I hope these comments answer your questions. (You should ask the lab to measure leakage current in accordance with 60990!) Best regards, Rich From: Brian Kunde <bkundew...@gmail.com> Sent: Wednesday, July 20, 2022 10:49 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Leakage Current Testing (Touch Current) Reference This has always confused me. Consider the EUT as ITE or Laboratory Equipment (61010-1). I can see where the PE conductor is opened and you place the Human Body Impedance Circuit (Measuring Device or MD) between the accessible metal chassis of the EUT and PE to measure the leakage current that a person might be exposed to. However, when Leakage Current is tested and recorded in the lab, the PE conductor is opened, but the MD is placed between L1 and chassis, and then to Neutral (L2) and chassis. These values are measured and recorded with the power switch ON and OFF. But in real life, the USER does not have access to L1 or N. So why is the test done that way? Or am I totally mistaken about how the MD is referenced during the test? Thanks to all in advance. The Other Brian - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
