Luiz, The applicable standards would depend on the product, e.g. whether it is a laser printer (ITE) with the necessary fuser, or a hair dryer, or a coffee maker. However, it is my understanding that most products involving heating devices would require two components, i.e. a temperature controlling device (thermostat) and a fail-safe device (thermal fuse).
ITE standards require safety after any single fault. If the control device fails in a shorted mode, what prevents the heating element from melting the product and potentially starting an external fire? At least for ITE, a bimetal thermostat would not also serve as the protection device unless there is no possible way to fail in the shorted mode. George ---------------- Forwarded by George Alspaugh/Lex/Lexmark on 09/21/2000 08:45 AM --------------------------- jim_bacher%mail.monarch....@interlock.lexmark.com on 09/21/2000 10:46:00 AM Please respond to jim_bacher%mail.monarch....@interlock.lexmark.com To: luizbonilla%ig.com...@interlock.lexmark.com, emc-pstc%majordomo.ieee....@interlock.lexmark.com cc: (bcc: George Alspaugh/Lex/Lexmark) Subject: Re:Protection or Control? forwarding for luizboni...@ig.com.br ____________________Reply Separator____________________ Subject: Protection or Control? Author: "Luiz Claudio" <luizboni...@ig.com.br> List-Post: emc-pstc@listserv.ieee.org Date: 9/20/00 9:59 PM I have a question to those who are familiar with the safety requirements established electrical appliance standards. A bimetal thermostat is usuallly used to control the temperature of a certain ambient within certain limits. Can it also be considered as a protection device? I'm not going to give my oppinion to avoid any possibility of biased answers. But, please, give your oppinion. If you have a reference publication which I could use as a reference for a work to be presented, please include it in your answer. If not, no problem. Just give your oppinion. Please answer this message to my personal email address: luizboni...@ig.com.br Thanks a lot, Luiz ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson: pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org