Thanks all,
I've found some voltage isolation and earthing requirements in clause 7.2.4 and 13.4.9 of EN 50155 which makes sense. Framing it against more familiar territory for me, it appears to replicate the basic requirements of EN 62368-1 for 1.5kVac/2.1kVdc between AC mains @ 230Vac and any low voltage secondary circuitry. It all seems to make sense. As always thank you for the helpful responses. All the best James James Pawson EMC Problem Solver Unit 3 Compliance Design for EMC / Pre Compliance / Problem Solving / EMC Testing / Consultancy / Environmental & Vibration <http://www.unit3compliance.co.uk/> www.unit3compliance.co.uk -- 07811 139957 Opening Hours: Tuesday to Friday, 0830 to 1800. Closed Monday. From: James Pawson (U3C) <ja...@unit3compliance.co.uk> Sent: 19 July 2019 09:40 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Railway Earthing and Isolation Requirements - Rolling Stock and Trackside Equipment Hello experts, I'm working with a company designing some equipment for both rolling stock and trackside applications for rail applications. Information about earthing schemes for this type of equipment seems to be ill defined. The customer has been given the (vague) requirement that they must achieve a 1.5kV isolation (presumably AC) from all equipment to Protective Earth. I'm assuming that this is on the low voltage side of a power supply but this too is unclear. Does anyone have access to any relevant standards literature, app notes, books, etc on Earthing requirements for rail applications? Any pointers at all would be welcome. Some googling on may part isn't coming up with much useful. Maybe I haven't found the correct search term? Thanks in advance, James James Pawson EMC Problem Solver Unit 3 Compliance Design for EMC / Pre Compliance / Problem Solving / EMC Testing / Consultancy / Environmental & Vibration <http://www.unit3compliance.co.uk/> www.unit3compliance.co.uk -- 07811 139957 Opening Hours: Tuesday to Friday, 0830 to 1800. Closed Monday. <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_cam paign=sig-email&utm_content=emailclient&utm_term=oa-4885-a> Virus-free. <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_cam paign=sig-email&utm_content=emailclient&utm_term=oa-4885-a> www.avg.com - ---------------------------------------------------------------- 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 <mailto:emc-p...@ieee.org> > All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) <http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org <mailto:sdoug...@ieee.org> > Mike Cantwell <mcantw...@ieee.org <mailto:mcantw...@ieee.org> > For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org <mailto:j.bac...@ieee.org> > David Heald <dhe...@gmail.com <mailto:dhe...@gmail.com> > --- This email has been checked for viruses by AVG. https://www.avg.com - ---------------------------------------------------------------- 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 Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
