Re: [PSES] Definition of accessible parts

[Doug Powell]

Title: Definition of accessible parts

Generally speaking hot surfaces and electrically accessible should not be confused. They are both hazards however. The standards I usually work with talk about touch on hot surfaces. Whereas an accessible surface is one which may become energized as a result of insufficient insulation from voltage.  A classic case is way back when electric drills were first made double insulated. Sometimes a manufacturer would forget and the metal rating plate had rivets that could become live. That said, it is possible for a hot surface to become energized as a result of heating or cooling. For example melting or failure or a plastic due to cold impact and cracking or shattering.   As for the glass envelope of a bulb and breakage, I would think the same rules apply regardless of surface temperature.   Thanks, - doug Douglas Powell http://www.linkedin.com/in/dougp01 From: Scott Xe Sent: Friday, November 1, 2013 11:32 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Reply To: Scott Xe Subject: [PSES] Definition of accessible parts In dielectric strength test, normally the high voltage is required to apply between live mains input and accessible parts.  What are the exact meaning of accessible parts?  In general, we use test fingers and/or test pins to determine an accessible parts.  Is there any other requirement to determine it such as operating temperature? Recently we notice there are dielectric strength tests for LED lamps and compact FL lamps but no dielectric strength tests required for halogen lamps.  Actually they all have glass bulb and all are operating on 230 Vac.  Isn’t glass bulb considered as an accessible parts on halogen lamp due to high operating temperature? Thanks and regards, Scott - ---------------------------------------------------------------- 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://www.ieee-pses.org/list.html (including how to unsubscribe) 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://www.ieee-pses.org/list.html (including how to unsubscribe) 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>