RE: Polarity Markings on AC Adapters
As far as I know, EIAJ CP1104 is the only standard worldwide that has the dc polarity symbol for barrel connectors. (Likewise, as far as I know, Japan has the only standard for barrel connectors.) This symbol is definitely NOT in IEC 417. I'm glad somebody asked that question - I've wondered it myself. Thanks for answering, Rich. Doug Massey LXE, Inc. -Original Message- From: Rich Nute [mailto:ri...@sdd.hp.com] Sent: Thursday, November 30, 2000 12:16 PM To: geor...@lexmark.com Cc: emc-p...@majordomo.ieee.org Subject: Re: Polarity Markings on AC Adapters Hi George: Thanks for the quick response! Does this mean that the symbology is only a Japan requirement? and does it apply to ITE as well as audio-visual equipment? The referenced standard, EIAJ CP1104, is similar to IEC 417. Indeed, EIAJ CP1104 contains many symbols from IEC 417 as well as from other sources. While the symbols are primarily those relating to audio-visual equipment, many of the symbols have much broader application, e.g., ground symbols, ac and dc symbols, etc. I cannot say whether or not these symbols are requirements in Japan or whether or not the standard applies to ITE. I would guess, however, that EIAJ CP1104 is a document which is referenced by end-product standards just as IEC 417 is referenced by end-product standards. (While I have a copy of the standard, it is in Japanese and I cannot read it!) As far as I know, EIAJ CP1104 is the only standard worldwide that has the dc polarity symbol for barrel connectors. (Likewise, as far as I know, Japan has the only standard for barrel connectors.) Best regards, Rich --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
RE: Polarity Markings on AC Adapters
Try this link for IEC 417 symbols http://w3.hike.te.chiba-u.ac.jp/iec417/ver2.0/html/index.html John Juhasz Fiber Options Bohemia, NY -Original Message- From: geor...@lexmark.com [mailto:geor...@lexmark.com] Sent: Thursday, November 30, 2000 10:45 AM To: emc-p...@majordomo.ieee.org Subject: Polarity Markings on AC Adapters To the safety professionals I need some input on a subject for which I am no expert. Typically, our AC adapter suppliers provide units with polarity symbols a la: - + O-C-O ...where the -/+ signs are within the circles. The C represents the outside of a standard barrel connector, and a bold dot in the center of the C represents the inner portion of the connector. Such adapters may be polarized in either direction. I was recently asked the standard specifying this polarity symbol, and did not know, and if it is mandatory. Since the connector typically involves only SELV voltages, I could find no specific references to this polarity marking in IEC 60950. Section 1.7.2 would not apply unless a hazard was introduced by the use of an inappropriate polarity adapter with the intended load. Certainly I could search for the basis of this marking, but like many of you, have found that this forum is often the fastest way to obtain such information. Thank you for any information you may be able to provide. George Alspaugh Lexmark International Inc. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
Re: Polarity Markings on AC Adapters
Hi George: Thanks for the quick response! Does this mean that the symbology is only a Japan requirement? and does it apply to ITE as well as audio-visual equipment? The referenced standard, EIAJ CP1104, is similar to IEC 417. Indeed, EIAJ CP1104 contains many symbols from IEC 417 as well as from other sources. While the symbols are primarily those relating to audio-visual equipment, many of the symbols have much broader application, e.g., ground symbols, ac and dc symbols, etc. I cannot say whether or not these symbols are requirements in Japan or whether or not the standard applies to ITE. I would guess, however, that EIAJ CP1104 is a document which is referenced by end-product standards just as IEC 417 is referenced by end-product standards. (While I have a copy of the standard, it is in Japanese and I cannot read it!) As far as I know, EIAJ CP1104 is the only standard worldwide that has the dc polarity symbol for barrel connectors. (Likewise, as far as I know, Japan has the only standard for barrel connectors.) Best regards, Rich --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
Re: Polarity Markings on AC Adapters
Hi George: The dc polarity symbol is specified in: Symbol 01060 (taken from JEIDA 11) EIAJ CP-1104 (1998) Terms and Grpahical Symbols for Audio and Audio-Visual Equipment Technical Standardization Committee on Audio-Visual Equipment and Systems Electronic Industries Association of Japan This standard now specifies the mark using diamonds rather than circles to enclose the + and - signs. I'll send you a copy of the page in a separate message (because my UNIX mail system can't send attachments). If anyone else wants a copy, please send private mail to me at: ri...@sdd.hp.com Best regards, Rich --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. 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: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
