Hi Brian, Since this is machinery, typically IEC 60204-1 would be applied. Check out clause 8.2.6 Additional requirements for electrical equipment having earth leakage currents higher than 10 mA.
Best regards, Mark Stultz | CMSE(r) | Sealed Air | AUTOBAG(r) brand Equipment | Streetsboro, OH | 330-342-2402 From: Brian Kunde <bkundew...@gmail.com> Sent: Friday, February 16, 2024 4:24 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] High Touch Current in Industrial Machinery You don't often get email from bkundew...@gmail.com<mailto:bkundew...@gmail.com>. Learn why this is important<https://aka.ms/LearnAboutSenderIdentification> CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. I am working on an Industrial Machine with a 3-phase 5hp motor driven by a VFD. To pass the EMC conducted emissions requirements, we had to add a RF Line Filter that is recommended by the VFD manufacturer. This filter has large Y-Caps. I know these currents theoretically cancel out in a balanced system, but when performing the traditional Touch Current test according to IEC 60990 6.2.2.2, Fault Condition No. 1 (open Protective Conductor) we measure a current about 50mA. However, the standard says that "this subclause do not apply to reliably earthed equipment. . . .". This Industrial Machine is either permanently wired or it can use an industrial grade plug and socket, so this fault test would not apply. So even though the measured current is high if we perform this fault test, because the machine is well grounded I do not have to do anything? In contrast, the IEC 62368 would require a warning label, warning in the manual, and a secondary PE terminal. I have read comments online such as, "in the industrial environment, they don't give a hoot about leakage current." Is this true? On the other hand, an industrial machine could be the size of a building and have dozens of VFD driven motors and line filters creating a huge amounts of currents in an unbalance environment. So in my case, do I have any concerns other than to insure the machine is well bonded to PE during installation? But isn't this a normal installation consideration? Thanks to all. 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-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/emc-pstc@listserv.ieee.org/ Website: https://ewh.ieee.org/soc/pses/ Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe)<https://ewh.ieee.org/soc/pses/list.html> List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: msherma...@comcast.net<mailto:msherma...@comcast.net> Rick Linford at: linf...@ieee.org<mailto:linf...@ieee.org> For policy questions, send mail to: Jim Bacher at: j.bac...@ieee.org<mailto:j.bac...@ieee.org> ________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 - ---------------------------------------------------------------- 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-PSTC@LISTSERV.IEEE.ORG All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/emc-pstc@listserv.ieee.org/ Website: https://ewh.ieee.org/soc/pses/ Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: msherma...@comcast.net Rick Linford at: linf...@ieee.org For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
