RE: Standards history
Bob, Your memory goes a long way. Additionally, as I remember it, in addition to UL flammability requirements, the mechanical stability section was also adopted almost word for word from UL 478 into IEC 435. The whole was further polished for clarity of thought and good body English by the tireless efforts of the Canadian contingent (Robert Mayhew ?? I may have the spelling wrong!) Tania Grant, Lucent Technologies, Octel Messaging Divsion tgr...@lucent.com -- From: Robert Johnson[SMTP:robe...@ma.ultranet.com] Sent: Wednesday, March 03, 1999 2:12 AM To: Muriel Bittencourt de Liz Cc: Lista de EMC da IEEE Subject: Re: Standards history I can fill in a little. It will be interesting to hear other historical views. EN60950 was copied from IEC 950 IEC 950 has been renumbered to IEC 60950 in line with the EC numbering scheme. IEC 950, Information Technology Equipment First edition1986 Amendment 1Nov-88 Amendment 2Jun-90 Second editionSep 91 Amendment 1Feb-92 Amendment 2Jun-93 Amendment 3Jan-95 Amendment 4Jul-96 Third editionAny day now. IEC 950 was the result of the merger of IEC 380 on business equipment, and IEC 435 on data processing equipment. Sorry, I don't have date histories on 380 or 435. IEC 950 has recently incorporated telecom needs, deriving much from IEC guide 105, EN 41003 and UL 1459 into the standard starting with the second edition third amendment and expanded significantly in the fourth amendment. IEC 435 was developed in the 1970s and inherited the aspects of a couple cultures. In general terms, the fire control portions came from North America, mostly out of UL 478, and the shock control portions came from Europe, mostly from VDE standards. The fire control portions seem to reflect the concerns in North America of largely wood construction which is quite sensitive to fire propagation. UL had previously developed a substantial base of flammability testing and construction rules which were incorporated as flame resisitance ratings and enclosure requirements into UL 478. The shock control seems to be driven from the increased risk of shock from higher mains voltages in Europe. Double insulation and the SELV circuit concept was the primary means to improve shock risk. At the same time IEC 950 was merging from its office and data processing roots, UL was doing the same by merging UL 114, office equipment and UL 478, data processing, into UL 1950, ITE. All use of UL 114 and 478 will be ended on 15 March 2000. CSA likewise merged CSA 143, office equipment and CSA 154, data processing, into CSA 220. UL and CSA made a transition from their old formats to CSA 950 in the IEC 950 format (with deviations) in the current edition. CSA 143 and 154 expired on 30 September 1993 and CSA 220 on 30 September 1999. EN60950 closely followed the IEC 950 schedule with: First edition 1988 Amendment 11990 Amendment 21991 Second edition1992 Amendment 11992 Amendment 21993 Amendment 31995 Amendment 41997 Third editionAlso close on the heels of IEC 950. Muriel Bittencourt de Liz wrote: Hello All, I doing a research that deals with EN standards. I'd like to know if someone has a brief historical of the changes from the early standards till actual standards (for example, IEC555 turned to IEC1000-3-2 and after EN61000-3-2). I'd like to know the reason for different naming and if possible the year of the changing... Thanks in advance for your help. Sincerely Muriel -- == Muriel Bittencourt de Liz INEP - Instituto de Eletronica de Potencia Universidade Federal de Santa Catarina Caixa Postal - 5119 88.040-970 - Florianopolis - SC - BRASIL Phone: +55.48.331.9204 - Fax: +55.48.234.5422 e-mail: mur...@inep.ufsc.br Homepage: http://www.inep.ufsc.br == - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com
Re: Standards history
You're remembering Conrad Maheux, a major player in the integration of the North American standards and the transition to IEC. For a long time he ran Canadian Business Equipment Manufacturer's Association, later to become ITAC. Always had his bucket of commas handy. Fondly remember the dinners at Antolini's. You bring up an interesting thread it would be nice to pursue. I'd like to invite subscribers to provide short bio's or reminiscences of some of the classic players on this scene. Derek Heatherington, Mike DeMartini, Ray Daniels, are just a few of the significant names from the past. Grant, Tania (Tania) wrote: Bob, Your memory goes a long way. Additionally, as I remember it, in addition to UL flammability requirements, the mechanical stability section was also adopted almost word for word from UL 478 into IEC 435. The whole was further polished for clarity of thought and good body English by the tireless efforts of the Canadian contingent (Robert Mayhew ?? I may have the spelling wrong!) Tania Grant, Lucent Technologies, Octel Messaging Divsion tgr...@lucent.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: Standards history
I can fill in a little. It will be interesting to hear other historical views. EN60950 was copied from IEC 950 IEC 950 has been renumbered to IEC 60950 in line with the EC numbering scheme. IEC 950, Information Technology Equipment First edition1986 Amendment 1Nov-88 Amendment 2Jun-90 Second editionSep 91 Amendment 1Feb-92 Amendment 2Jun-93 Amendment 3Jan-95 Amendment 4Jul-96 Third editionAny day now. IEC 950 was the result of the merger of IEC 380 on business equipment, and IEC 435 on data processing equipment. Sorry, I don't have date histories on 380 or 435. IEC 950 has recently incorporated telecom needs, deriving much from IEC guide 105, EN 41003 and UL 1459 into the standard starting with the second edition third amendment and expanded significantly in the fourth amendment. IEC 435 was developed in the 1970s and inherited the aspects of a couple cultures. In general terms, the fire control portions came from North America, mostly out of UL 478, and the shock control portions came from Europe, mostly from VDE standards. The fire control portions seem to reflect the concerns in North America of largely wood construction which is quite sensitive to fire propagation. UL had previously developed a substantial base of flammability testing and construction rules which were incorporated as flame resisitance ratings and enclosure requirements into UL 478. The shock control seems to be driven from the increased risk of shock from higher mains voltages in Europe. Double insulation and the SELV circuit concept was the primary means to improve shock risk. At the same time IEC 950 was merging from its office and data processing roots, UL was doing the same by merging UL 114, office equipment and UL 478, data processing, into UL 1950, ITE. All use of UL 114 and 478 will be ended on 15 March 2000. CSA likewise merged CSA 143, office equipment and CSA 154, data processing, into CSA 220. UL and CSA made a transition from their old formats to CSA 950 in the IEC 950 format (with deviations) in the current edition. CSA 143 and 154 expired on 30 September 1993 and CSA 220 on 30 September 1999. EN60950 closely followed the IEC 950 schedule with: First edition 1988 Amendment 11990 Amendment 21991 Second edition1992 Amendment 11992 Amendment 21993 Amendment 31995 Amendment 41997 Third editionAlso close on the heels of IEC 950. Muriel Bittencourt de Liz wrote: Hello All, I doing a research that deals with EN standards. I'd like to know if someone has a brief historical of the changes from the early standards till actual standards (for example, IEC555 turned to IEC1000-3-2 and after EN61000-3-2). I'd like to know the reason for different naming and if possible the year of the changing... Thanks in advance for your help. Sincerely Muriel -- == Muriel Bittencourt de Liz INEP - Instituto de Eletronica de Potencia Universidade Federal de Santa Catarina Caixa Postal - 5119 88.040-970 - Florianopolis - SC - BRASIL Phone: +55.48.331.9204 - Fax: +55.48.234.5422 e-mail: mur...@inep.ufsc.br Homepage: http://www.inep.ufsc.br == - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
