Hi Scott: IEC 61239 requires two sets of markings, one for the characteristics of the supply system (3.2.1) and one for the ratings of the equipment (3.2.2). In 3.2, IEC 61239 states: "Each technical committee shall select the characteristics listed in 3.2 necessary to enable proper and safe application of the equipment." Then, 3.3 states: "If a given sequential order is needed,... the following sequence is recommended..." So, sequence is not necessarily required by IEC 61239. IEC 60065 and 60950 preceded 61239. So, the sequences chosen by the product technical committees were long established before 61239 was published. The sequences have been carried forward to the latest editions of these product standards. Since the sequence requirement in 61239 3.3 is an "if needed" requirement, there is no imperative for technical committees to modify the long-standing sequences specified in the product standards. Consequently, the product requirements in 60065 and 60950 are correct and are in accordance with 61239. Best regards, Rich Richard Nute Product Safety Consultant San Diego
From: Scott Xe [mailto:[email protected]] Sent: Thursday, August 16, 2007 9:11 AM To: [email protected]; [email protected] Subject: RE: Rated supply voltage & nature of supply symbol Dear Rich & Brian, Thanks for your advice. Referring to IEC 61293, “~ 230 V” is a correct marking. In many electronics products or electrical appliances, they are commonly marked “230 V~” and I believed they were correct. I am now surprisingly aware that ~ 230 V is a correct marking. Do you have any idea why “230 V~” is considered correct for so long? Thanks and regards, Scott From: Richard Nute [mailto:[email protected]] On Behalf Of [email protected] Sent: Thursday, August 16, 2007 10:58 PM To: 'Scott Xe'; [email protected] Subject: RE: Rated supply voltage & nature of supply symbol Hi Scott: As Brian has mentioned, the base document for rating markings is IEC 61293. This document does specify the sequence of rated values and characteristics. Best regards, Rich Richard Nute Product Safety Consultant San Diego From: [email protected] [mailto:[email protected]] On Behalf Of Scott Xe Sent: Thursday, August 16, 2007 3:53 AM To: [email protected] Subject: Rated supply voltage & nature of supply symbol These are required in supply ratings of many safety standards. Is there any required format, i.e., rated supply voltage + nature of supply symbol, nature of supply symbol + rated supply voltage? Thanks, Scott ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________ - ---------------------------------------------------------------- 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
