Ampacity charts (particularly in the NEC) may assume wire pulled in conduit, more than one current-carrying conductor, etc. You may be better off using a chart from your product Standard (60950 has something to say on this topic but it's a bit conservative). In your case, I would approach the agency with some thermal testing showing that you haven't exceeeded the insulation's temperature rating (assuming it has one) in the application and you continue to pass all the other requirements of your product standard. If it's not a ground wire I think they would be OK with this approach and some limited testing.
-Ken On Wed, Sep 4, 2013 at 3:15 PM, McInturff, Gary < gary.mcintu...@esterline.com> wrote: > I was just discussing the current handling capabilities of appliance > wiring material and while I have a chart it is of unknown heritage and > differs from some other reference material. For example the chart I have > says 26AWG wire can handle about 0.25 amps, but when I look at the > connector it says about 1 amp with a 26 AWG wire. I made a search for the > NEC amperages but they I could find anything smaller (larger?) about 18 > guage and it was primarily for power wiring.**** > > Can anybody give me a good reference for AWM current handling > capabilities? The UL web-site seems pretty useless as well. Heck I think I > talked one of their engineers out of the chart I have. My original > supposition was that the wire insulation rating would be exceeded if X amps > were run through Y gauge wire, and that was from a safety perspective the > upper limit of current. I realized that impedance per/foot has implications > on voltage drop etc, but in this case those things are moot. I just want to > run 0.5 amps down a 26 AWG wire for about 3 inches at low frequency > without overheating the insulation. Again one reference holds about ¼ amp, > while another says 1 amp.**** > > ** ** > > ** ** > > ** ** > > .**** > > Gary McInturff**** > > Reliability/Compliance Engineer**** > > ** ** > > ** ** > > ** ** > > ** ** > > **** > > *Esterline Interface Technologies*** > > *Featuring * > > *ADVANCED INPUT, GAMESMAN, LRE MEDICAL, and MEMTRON products* > > 600 W. Wilbur Avenue**** > > Coeur d’Alene, ID 83815-9496**** > > Toll Free: 800-444-5923 X1XXX**** > > Tel: (208) 635-8**** > > Fax: (208) 635-8**** > > ** ** > > www.esterline.com/interfacetechnologies**** > > ** ** > > *Technology, Innovation, Performance…* > > "Information in or attached to this e-mail message may be subject to > export control restrictions of the International Traffic in Arms > Regulations (ITAR) (22 CFR pts. 120-130) or the Export Administration > Regulations (EAR) (15 CFR pts. 730-774). Before exporting this information > outside the United States or releasing it to a foreign person in the United > States, you need to determine whether a license under the EAR or the ITAR > is required to do so. If you have any questions about this obligation, > please contact me."**** > > ** ** > > Click > here<http://www.esterline.com/governance/email_disclaimer/tabid/1532/Default.aspx>to > read disclaimer > ** > > ** ** > > ** ** > - > ---------------------------------------------------------------- > > 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://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 <emcp...@radiusnorth.net> > Mike Cantwell <mcantw...@ieee.org> > > For policy questions, send mail to: > Jim Bacher <j.bac...@ieee.org> > David Heald <dhe...@gmail.com> > - ---------------------------------------------------------------- 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://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 <emcp...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
