Hi,
Do you also need to de-rate the section of wire that is thermally insulated by the cable tie? Maybe the cable tie is too narrow to be of concern – but then what width is needed before de-rating does become necessary? I agree – all de-rating factors need to be applied. Regards Tim ************************ Tim Haynes A1N10 Electromagnetic Engineering Specialist SELEX Sensors and Airborne Systems 300 Capability Green Luton LU1 3PG * Tel : +44 (0)1582 886239 * Fax : +44 (0)1582 795863 * Mob : +44 (0)7703 559 310 * E-mail : [email protected] P Please consider the environment before printing this email. There are 10 types of people in the world-those who understand binary and those who don't. J. Paxman ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Kunde, Brian Sent: 02 February 2009 19:48 To: [email protected] Subject: De-Rating Hookup Wire I want to make sure I’m properly de-rating the current capacity of hook-up wire. A 105º hookup wire size 10 AWG is rated 58 amps at 30ºC. At 50ºC (40ºC out side temp and 10ºC internal temp rise) I have to de-rate by .86 which would now make it handle only 49.9 amps. If I bundle 2 to 5 wires together, I have to de-rate another .8 which would make it only rated for 39.9 amps. So do I de-rate the de-rated value or is there some other method that is more correct? What is considered a “Bundle”? If I cable tie 2 wire together is this considered a bundled? Is there an additional de-rating for wire length of hookup wire? I assume wire length only affected voltage drop, not current rating. Thanks to all for your help. The Other Brian _________________________ LECO Corporation Notice: This communication may contain confidential information intended for the named recipient(s) only. If you received this by mistake, please destroy it and notify us of the error. Thank you. - 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]> SELEX Sensors and Airborne Systems Limited Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England & Wales. Company no. 02426132 ******************************************************************** This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. ******************************************************************** - 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]>
