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
