In message <of2ff2a340.a1604da9-on80257552.0038c455-80257553.00309...@ametek.com>, dated Wed, 4 Feb 2009, [email protected] writes:
>where a cable is totally surrounded by thermal insulation having a >greater thermal conductivity than 0.04 Wm-1K-1, the following derating >factors are applied: > >length in insulation(mm) Derating factor >50 0.88 >100 0.78 >200 0.63 >400 0.51 >500 or more 0.50 Presumably, where the insulated length is quite short a significant amount of heat is conducted away through the conductor itself to the uninsulated parts of the cable. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Things can always get better. But that's not the only option. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - 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]>
