For most IT and AV stuff, Class III equipment has no requirement for protection from electric shock. Any power connected to a Class III device must be considered safe to contact.
A power source with Class I construction, with a SELV output will not necessarily be considered safe to touch (leakage, inherently limited power, etc). Local code requirements could also effect power source requirements. Brian From: [email protected] [mailto:[email protected]]On Behalf Of Piotr Galka Sent: Saturday, November 14, 2009 2:05 AM To: EMC-PSTC Subject: A very basic safety question. All, Consider two power supplies, both AC230V to DC12V: PS1 - with basic insulation and one of its output terminals grounded with protective conductor, PS2 - with double or reinforced insulation and floating output. I understand that PS1 is CLASS I equipment, and PS2 is CLASS II equipment. Now consider the 12V powered device connected to one of them. Is that device CLASS III equipment in both cases? Best Regards Piotr Galka MicroMade Poland - 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]>
