Alex, Presumably you can calculate the power per unit length, so if you have a thermal modelling programme and the characteristics of all materials (insulation sheath, etc) then it should be possible to quite accurately model a unit length and predict the thermal performance under the conditions specified. For completeness, it would be ideal to validate the model with an actual test, but thermal models are usually much more accurate than structural models and should give you a good idea whether your cable design will meet requirements. Best regards
Neil R. Barker CEng MIET HonFSEE MIEEE Manager Quality Engineering e2v technologies (uk) ltd 106 Waterhouse Lane Chelmsford Essex CM1 2QU UK Tel: (+44) 1245 453616 Fax: (+44) 1245 453571 Mob: (+44) 7801 723735 P Please consider the environment before printing this email. From: Alex Horvath [mailto:[email protected]] Sent: 19 July 2007 20:33 To: [email protected] Subject: Short term current carrying capacity of braided cable Hi, (Hopefully this is not too far off topic) I'm an EE but a mechanical engineer designing a high current braided cable has 2 specs from the customer. One is simply the continuous current requirement of braided cable they want us to design and the other spec is a current rating 6 times higher but for a 2 minute duration. In both cases a maximum temp rise is specified. Since the cable has a continuous current rating from the manufacturer the first spec is a no-brainer. However, the second specification is beyond my abilities to anayze and in fact is probably quite complex. Even if I could figure out how to analyze the transient temp rise of a solid conductor a braided conductor is much more complex due to it's much larger surface area etc. Is anyone aware of a mil std or similar which addresses this issue? ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________ Sent by E2V TECHNOLOGIES PLC or a member of the E2V group of companies. A company registered in England and Wales. Company number: 04439718. Registered address: 106 Waterhouse Lane, Chelmsford, Essex, CM1 2QU, UK. - ---------------------------------------------------------------- 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
