The terminology used varies depending on the standard and code making panel.
In the United States, NFPA 70 (National Electrical Code or NEC) article 645.10 still requires remote power disconnect buttons for the information technology equipment, power distribution equipment and cooling equipment in a data center. There are various methods to comply with the requirement, and there are exceptions for critical operation systems that meet specified requirements. Areas of the data center are allowed to be zoned with separate disconnect controls. The power disconnect does not need to turn off the lighting, and it probably shouldn’t. The intention is to allow emergency response personnel to make the area safe if something bad happens. There is no name given to the button in the NEC. Data center managers aren’t thrilled with the requirement because it creates a potential single point of failure where accidental activation could create a big hassle. The buttons are sometimes referred to as “remote power off” to disassociate them from the term “emergency”. Most of the safety test labs I’ve worked in have had one of these buttons by the door out of the room. For the secure labs, the button often disables the lock on the door allowing emergency responders to enter the room without having to break the door down. I worked in one lab where there was also the big red button on the outside of the lab. There was a window on the door so people on the outside could see if your safety test engineer was lying unconscious on the floor in need of rescue. I’m not as familiar with the terminology for machinery, but I’ve usually seen “emergency stop” or “e-stop”. The most common problem I’ve seen here has been when the equipment designer places the button too far away from the potential hazard. The button doesn’t do any good to an operator trapped in a machine if they can’t reach it. Ted Eckert Microsoft Corporation The opinions expressed are my own and do not necessarily reflect those of my employer. ████████ █ STOP █ ████████ From: John Woodgate [mailto:jmw1...@btinternet.com] Sent: Monday, June 27, 2016 2:09 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] EMO vs EPO RE: you could hit the nearest red bottom That would get you shut down these days! With best wishes DESIGN IT IN! OOO – Own Opinions Only www.jmwa.demon.co.uk<http://www.jmwa.demon.co.uk/> J M Woodgate and Associates Rayleigh England We live in exiting times From: Kunde, Brian [mailto:brian_ku...@lecotc.com] Sent: Monday, June 27, 2016 9:34 PM To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: Re: [PSES] EMO vs EPO When I was in High School Shop Class, there were electrical boxes hanging from cords down from the ceiling all around the room with large red buttons. Pressing any of these buttons would turn power off to every piece of machinery and to all work benches in the room (lights would stay on). That way if you saw someone from across the room about to do something stupid, being hurt, electrocuted, caught in a machine, etc., you could hit the nearest red bottom and it would shut everything down. I wonder if this method is still used today. That was 40 years ago. The Other Brian - ---------------------------------------------------------------- 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<mailto: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)<http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org<mailto:sdoug...@ieee.org>> Mike Cantwell <mcantw...@ieee.org<mailto:mcantw...@ieee.org>> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org<mailto:j.bac...@ieee.org>> David Heald <dhe...@gmail.com<mailto: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 <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
