I have a little information on the possible origins of 60950 Annex J. Please note the following information is for reference purposes only. I am not stating definitively that this information is the basis of Annex J, nor I am not stating that the information in Annex J is correctly applicable to Information Technology Equipment and the environment in which it is used.
The values listed in Annex J appear to be from ASTM G82: Guide for Development and Use of a Galvanic Series for Predicting Galvanic Corrosion Performance. In particular, Annex J is close to the values given for metals immersed in sea water. The scope of ASTM does give appropriate warning and states: "This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use." ASTM G82 gives ranges where 60950 gives specific values, so there isn't an exact correlation. A copy of the ASTM G82 table is in this link. http://www.assda.asn.au/asp/index.asp?pgid=18533 I cannot say with any certainty that the ASTM standard is the origin of the table. However, it is likely that Underwriters Laboratories used ASTM G82 in their standards and it has been copied through the history of revisions all the way to the latest versions. If anybody has more definitive information on the history, I would like to know the correct story. I would also be interested in better sources for information on the corrosion of dissimilar metals in environments more common for Information Technology Equipment. Ted Eckert American Power Conversion/MGE 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. - 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
