Duncan, EN 563:1994 "Safety of machinery. Temperatures of touchable surfaces. Ergonomics data to establish temperature limit values for hot surfaces" should help you to identify whether the combination of temperature and thermal conductivity represents a significant risk or not in your application.
Regards Nick. At 4:46 pm +0100 13/9/05, Duncan Hobbs wrote: >Group, > >UL61010B-1 and EN61010-1 define upper temperature limits for parts of >the equipment, specifically handles have a maximum limit of 55C if they >are metalic or 70C if they are non metalic. The standard also permits >handles that are non metalic and held only for short periods to a >maximum temperature of 80C > >The question I have is what of the situation where you have a metalic >part that has a non metalic finish? Obviously normal paint could not be >used to give a non metalic surface due to its thin nature as it would do >little to change the thermal conductivity of the surface, but what of >the situation where a surface is powder coated or dip coated with a >plastic/rubber finish? FYI the particular part in question is only held >for short period of time in normal use. The surface finish also feels >warm to the touch indicating to me that it has poor thermal conduction >(metal always feels cold as is conducts the heat away from your hand) > >Does anyone have any opinions or can point me to some sources that may >give guidance on this? > >Many thanks in advance, > > >Duncan Hobbs, Senior Compliance Engineer >Product Compliance Laboratory >Xyratex Technology Ltd. >Havant, >Hampshire, >U.K. >PO9 1SA >tel: 02392 496444 >fax: 02392 496014 >[email protected] > - 2005 IEEE Symposium on Product Safety Engineering 3-4 October Schaumburg, IL http://www.ieee-pses.org/symposium 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/listserv/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: 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
