John, thanx for your note on this. I’m not surprised that the WWW is wooly on this subject. My sources for this are from my experience – with my former employer who had two UK shops producing products and had to deal with this issue as well as feedback from clients that I have had along the way in my consultancy who were caught up in this issue. In either case it all seemed to be quite bureaucratic and inflexible when it got to the factory floor during HSW inspections.
:>) br, Pete Peter E Perkins, PE Principal Product Safety & Regulatory Affairs Consultant PO Box 23427 Tigard, ORe 97281-3427 503/452-1201 IEEE Life Fellow <mailto:p.perk...@ieee.org> p.perk...@ieee.org From: John Woodgate <j...@woodjohn.uk> Sent: Wednesday, August 15, 2018 12:14 PM To: Pete Perkins <peperkin...@cs.com>; EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] hipot test in the UK, the requirements are in fact very woolly, and it's difficult to find definitive information on the Web. But testing doesn't have to be done annually, and hi-pot only in cases of repair of hired-out equipment. Unfortunately, insulation resistance testing, with PASS values even below 1 megohm in some cases, is included. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk <http://www.woodjohn.uk> Rayleigh, Essex UK On 2018-08-15 17:03, Pete Perkins wrote: All, This discussion goes around year after year. The test results reported – especially Nute – show that it takes dozens, maybe hundreds of hipot tests to damage adequate insulation. In the UK, so I hear, the gov’t safety folks expect each piece of equipment to be hipot retested annually to demonstrate adequate insulation. We don’t hear a large hue and cry about failing equipment in that arena. So from the experience and the data it is clear that both the engineering type hipot testing and the factory routine testing should not pose any problem to properly designed and manufactured products. For line connected products it is foolishness to remove components for hipot testing. If that is being done the product is not robust enough in the first place. This includes DC line powered equipment since so much DC power is being installed and used in places where it is subject to the same lighting and starting impulses traditionally seen on AC line operated equipment. :>) br, Pete - ---------------------------------------------------------------- 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>
