Depends a lot on the application, region and where on the equipment. For example, for machinery, if the LEDs are part of the operator interface or machine-mounted control device, both EN 60204-1 (IEC 60204-1) and ANSI/NFPA 79 have specific requirements for "INDICATOR LIGHTS" in general (not specific to LEDs). (As always, the two standards [US/EU] are similar, but not exactly the same.)
Note that red is supposed to be used only for "emergency". Normal operation should _not_ be an emergency. Machine stopped is usually also a safe condition, not an emergency. For example, EN (and IEC) 60204-1: (IMPORTANT: See section 10.3.2 for exceptions and additional requirements.) Colour Meaning Explanation Action by operator ------ --------- ------------------- --------------------------------------- RED Emergency Hazardous condition Immediate action to deal with hazardous condition (e.g. by operating E-stop) YELLOW Abnormal Abnormal condition; Monitoring and/or intervention (e.g. by Impending critical condition re-establishing the intended function) GREEN Normal Normal condition Optional BLUE Mandatory Indication of a condition that Mandatory action requires action by operator WHITE Neutral Other conditions; may be used Monitoring whenever doubt exists about use of RED,YELLOW,GREEN,BLUE If the LEDs were inside the machine, only visible to a service technician, you might consider that they were not "operator interface". Other sectors/products/regions will have different requirements, let's see what we can collect via this listserver. best regards, glyn ---------------------------------------------- TUV Rheinland of North America, Inc. Product Safety & Quality Industrial Machinery Division (Chicago Office) Glyn R. Garside Senior Engineer 1945 Techny Rd, Unit 4 NORTHBROOK, IL 60062-5357, USA Tel (847)562-9888 ext 25 Cell (847)612-1574 Fax (847)562-0688 email ggars...@us.tuv.com http://www.us.tuv.com Luiz Claudio Bonilla de Araujo To: emc-p...@majordomo.ieee.org <luizboni...@ig.com.br> cc: luiz_c_boni...@multibras.com.br Sent by: Subject: LED Color owner-emc-pstc@majordom o.ieee.org 03/21/2002 15:08 Please respond to Luiz Claudio Bonilla de Araujo <Does anybody know any standard or guideline regarding the colors used in LED displays? Usual applications commonly apply green for "ON" and red for "OFF", but I would like to know if there is any national / international standard that specifies the LED color according to the function that it is informing to the user (eg. alarm, continuous operation, high/low speed, etc.) > ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"