Joel asked <When (if ever) is it mandatory to include an Emergency Stop Switch/Button in a machine's design?
Must an emergency stop switch be completly hardware, or can it function through the instrument's computer and software? What responce time should be expected? (2 part question) a) How long must the emergency switch be held before the function is recognized by the instrument (i.e. if I tap the switch and run, will it stop the machine). b) How long till the machine stops its action after the button is pressed?> For medical equipment, in the UK, particularly Linear Accelerators, it's well specified in BS EN 60601-2-1 clause 22.7.101. This is a very particular requirement, I rather think that general safety, as per Machinery Directive and Low Voltage Directive equipment, the requirement is much more open to individual rationale. Power presses, for instance, have very different emergency stop criteria to an electric toaster. Just a few pennies worth. Chris Duprés *******************Internet Email Confidentiality Footer******************* The contents of this e-mail message (including any attachments hereto) are confidential to and are intended to be conveyed for the use of the recipient to whom it is addressed only. If you receive this transmission in error, please notify the sender of this immediately and delete the message >from your system. Any distribution, reproduction or use of this message by someone other than recipient is not authorized and may be unlawful. - 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/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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
