Hello Gary, I don't know of a precise definition of pollution degree, but Annex E of IEC 61010-1 may be useful for some guidance. It shows different measures that may be used to reduce the pollution degree of electronics. For example, an IPX4, IPX5 or IPX6 enclosure of IEC 60529 would be considered pollution degree 2 on the inside when placed in a pollution degree environment. These enclosures will not provide a reduction from pollution degree 2 to 1, but an IPX7 or IPX8 enclosure can.
This Annex doesn't give precise humidity or conductivity specifications, but it can be used as another reference to the intended environments for each pollution degree designation. Ted Eckert American Power Conversion http://www.apc.com/ The items contained in this e-mail reflect the personal opinions of the writer and are only provided for the assistance of the reader. The writer is not speaking in an official capacity for APC-MGE or Schneider Electric. The speaker does not represent APC-MGE's or Schneider Electric's official position on any matter. Gary Tornquist <garytor@MICROSOF T.COM> To Sent by: "[email protected]" [email protected] <[email protected]> cc 11/13/2007 01:00 Subject PM Pollution Degrees Compliance comrades – We’ve dug through IEC 60664-1. Unfortunately, we did not find what I was looking for. I need your help once again. I am looking for an official expose on what the IEC precisely means by ‘Pollution Degree’. In which document do they describe/quantify this parameter? I understand that it generally means ‘conductive dust and/or moisture’ and that it is used to establish categories of creepage/clearance distances. Well, what the heck is ‘conductive dust’ and how do they quantify the moisture levels? – our Reliability team is trying to quantify moisture/dust exposure and acceleration factors. Thanks for your help! Sincerely, Gary Tornquist Director of Product Safety Microsoft Corp. 425-705-6099 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
