For IP66, the answer is "none shall pass". Which is where a IPx7 or x8 item will usually have a 6 in place of the x, if it is water tight it is usually dust tight. I have seen several potted products where it was dust tight, but not water. It failed to function after water testing.
To Nick's heating/cooling comment, I agree with you, but the general standard does not have the requirement; there are some product family variants that do (such as luminaries). -Doug Kramer From: [email protected] [mailto:[email protected]] On Behalf Of Mark Hone Sent: Thursday, September 03, 2009 12:07 PM To: Subject: Re: IP Rating on Class 2 Powered LED Fixture Colleagues - John Woodgate <[email protected]> 03/09/09 16:55:10 >>> > IP ratings are only about penetration of the > enclosure, not about whether a product is safe or not. If stuff gets in, > it's not IP68. For dust and water penetration, does the Standard say how much can get in? A gram? A milligram? A microgram? Or is it that if you can see anything, it;'s too much? (With glasses on, or without?) Just curious, I haven't (yet) had to get anything qualified. Regards, Mark -- Mark Hone, HESS Manager Wellman Defence Limited Williams Road Portsmouth, Hampshire PO3 5FP, ENGLAND Tel: +44 (0)23 9266 4911 Tel: +44 (0)23 9262 9239 (Direct) Fax: +44 (0)23 9269 7864 Mobile: +44 (0)7919 047775 - 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 <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> - 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 <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
