Mark, No, it absolutely must be YELLOW as the recognized colour combination is RED and YELLOW. See NFPA 79, 2015, 9.2.5.4, IEC 60204-1:2018, 10.7, ISO 13850:2015, 4.3.6.
BTW, here are the actual words WRT to the colour and size: > 4.3.6 The actuator of the emergency stop device shall be coloured RED. As far > as a background exists > behind the actuator and as far as it is practicable, the background shall be > coloured YELLOW. > Emergency stop devices shall be designed and mounted in such a way that the > actuation cannot be easily > blocked by simple means. > NOTE This can happen when objects fall beneath the actuating surface or when > there is an intention of defeating. > Emergency stop device requiring a key on the actuator to be disengaged > (unlatched) should be avoided. > When an emergency stop actuator can only be disengaged by using a key, to > avoid injuries to hands, > instruction for use of the machine shall describe the correct use of the key > and provide a warning that > the key should only be in the actuator of the device to disengage the > actuator. As to the “Emergency Stop” text marking: > 4.3.7 Neither the actuator nor the background should be labelled with text or > symbols. Where a symbol > is needed for clarification, the symbol from IEC 60417-5638 shall be used, > see Figure 2. > When it is necessary to identify the direction of unlatching of the actuator > (button) then this identification > shall have the same or nearly the same colour as the actuator (see also IEC > 60947-5-5). > NOTE The identification of unlatching (i.e. arrows) could be misinterpreted > as direction of actuation. The IEC standard that details the requirements for the estop device is IEC 60947-5-5, Low voltage switchgear and controlgear—Part 5-5: Control circuit devices and switching elements—Electrical emergency stop device with mechanical latching function. Doug Nix d...@ieee.org +1 (519) 729-5704 > On 24-Apr-19, at 14:52, Mark Ortlieb <ortl...@braincorporation.com> wrote: > > Gents, > > This is a very timely discussion as some of this has come up as a topic of > discussion for me in just the last couple days. Specifically regarding the > yellow background. My question is: > > Must the background be yellow, or can it be any color as long as it provides > strong contrast with the red button? Someone suggested blue as a background > color because allegedly this is easier for color blind persons to see. > > What standard(s) does this requirement come from? > > Thanks, > > Mark > > Mark Ortlieb > Sr. Product Safety Engineer > 858-207-7591 > > Brain Corporation™ > 9401 Waples Street, Suite 100 > <https://maps.google.com/?q=9401+Waples+Street,+Suite+100+San+Diego,+CA%C2%A0+92121&entry=gmail&source=g> > San Diego, CA > <https://maps.google.com/?q=9401+Waples+Street,+Suite+100+San+Diego,+CA%C2%A0+92121&entry=gmail&source=g> > 92121 > <https://maps.google.com/?q=9401+Waples+Street,+Suite+100+San+Diego,+CA%C2%A0+92121&entry=gmail&source=g> > www.braincorp.com <http://www.braincorp.com/> > > > > > > From: "Doug Nix, C.E.T." <d...@ieee.org> > Reply-To: "Doug Nix, C.E.T." <d...@ieee.org> > Date: Wednesday, April 24, 2019 at 10:16 AM > To: "EMC-PSTC@LISTSERV.IEEE.ORG" <EMC-PSTC@LISTSERV.IEEE.ORG> > Subject: Re: [PSES] E-Stop Questions > > Hi Brian, > > I’ve dealt with many related questions on my blog, machinerysafety101.com > <http://machinerysafety101.com/> > https://machinerysafety101.com/series/emergency-stop/ > <https://machinerysafety101.com/series/emergency-stop/>, but not these > specific questions, so I’ll answer them now. Then I’ll add them to the blog > (thanks for the inspiration!). > > 1) How mushroom-shaped is enough? > > There’s no hard answer to this, but I can say this: there are three > fundamental shapes for push button operators, flush, extended, and mushroom. > The intent is that neither flush nor extended head operators be used for > e-stop functions. More info in IEC 60947 on that. > > 2) Yellow background. Yellow backgrounds have to be big enough to provide > clear contrast with the red button operator. A tiny ring, or just a yellow > stripe around the base of the button is not enough in my opinion. Typical > rings are 2x the operator nominal size, i.e., 30 mm buttons get a 60 mm ring, > 22 mm buttons get a 44 mm ring. These are common practice recommendations. > > 3) Printing “emergency stop” on the yellow ring is not required in any > jurisdiction anymore, and has been removed from NFPA 79, as well as IEC > 60204-1. Just leave it off, as the red/yellow combination is internationally > recognized as the sign for e-stop and emergency switching off devices. > > Best, > Doug Nix > > d...@ieee.org <mailto:d...@ieee.org> > Mobile: (519) 729-5704 > Office:(519) 650-4753 > > On Apr 24, 2019, at 12:49, John Woodgate <j...@woodjohn.uk > <mailto:j...@woodjohn.uk>> wrote: > > Mushrooms come in all sorts of shape, so the description is not very > scientific. It's only a concern if the AHJ thinks it is! > > Whether the English is acceptable is a matter for national legislation, so > there are probably several incompatible answers. > > Best wishes > John Woodgate OOO-Own Opinions Only > J M Woodgate and Associates www.woodjohn.uk <http://www.woodjohn.uk/> > Rayleigh, Essex UK > On 2019-04-24 17:43, Brian Kunde wrote: > I am constantly being asked three questions about E-Stops which I cannot find > the answers to. > > 1. "Mushroom Shape" is specifically called out in some standards but the > newer style e-stop switches are becoming less and less Mushroom Shaped. If > this a concern? > > 2. "Yellow Background" is getting smaller and smaller. Some small e-stop > switches has no yellow background but has a small area on the shaft of the > switch that is yellow. This is not technically the "background". Is this > acceptable or is a yellow background required in addition? The size of the > yellow area is not specified as far as I have found. > > 3. English text "Emergency Stop" printed on the button or on the yellow > background ring: Is this a problem in non-english speaking countries? Do I > have to translate (like in French for France and Canada) or are these words > "globally acceptable"? I have been telling our engineers to choose e-stop > switches and yellow rings without text but some manufacturers only provide it > with the text. > > Thanks to all. > > 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 > <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/ > <http://product-compliance.oc.ieee.org/> can be used for graphics (in > well-used formats), large files, etc. > > Website: http://www.ieee-pses.org/ <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 > <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 <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 > <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/ > <http://product-compliance.oc.ieee.org/> can be used for graphics (in > well-used formats), large files, etc. > > Website: http://www.ieee-pses.org/ <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 > <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 <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 > <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/ > <http://product-compliance.oc.ieee.org/> can be used for graphics (in > well-used formats), large files, etc. > > Website: http://www.ieee-pses.org/ <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 > <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>
