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Jim, American Wire Gage (AWG) was originally called the Brown & Sharp Gage (B&S). It is defined by: * A solid, round AWG 4/0 (AWG 0000) wire is 0.4600 inch diameter. * A solid, round AWG 36 wire is 0.005 inch diameter. * Wire diameters follow a geometric progression. Thus solid wire diameter is approximately 0.32486 * 0.89053^AWG inches or 0.0082515 * 0.89053^AWG meters. The diameter of standed wire depends on whether it is: * Concentric-Lay, and the number of strands (7-strand is nominally 1.134 times, 19-strand is nominally 1.147 times, and 37-strand is nominally 1.151 times the diameter of the same AWG solid wire) * Equilay. * Bunched. * Rope/Bunched. * Rope/Concentric. * Smooth-Bunched. For these other constructions you either need to measure a sample, or look in manufacturers' catalogs. This information comes from Appendix H, Wire Gages, of Robust Electronic Design Reference Book, Volume 2 (Kluwer Academic Publishers: Boston, MA, 2004), which discusses 28 common wire gages encountered worldwide. Similarly, Appendix I, Sheet Metal Gages, discusses 13 common sheet metal gages encountered worldwide. By the way, Chapter 17 of the books, Transient Suppressors and Surge Suppressors, can now be downloaded for free from Kluwer's web site at http://www.wkap.nl/prod/b/1-4020-7739-4 . Just click on "Click here for your FREE PREVIEW & additional information" on the right. IEC 600065:2001 and CAN/CSA-22.2 No. 60950-1-03:2003 (UL 60950-1:2003) both use mm^2. As far as I recall, all the safety standards that I have read concerning wires use either AWG or cross-sectional area (CSA). John Barnes KS4GL, PE, NCE, ESDC Eng, SM IEEE dBi Corporation http://www.dbicorporation.com/ This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. IEEE PSES Main Website: http://www.ieee-pses.org/ To post a message send your e-mail to [email protected] Instructions for use of the list server: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
