RE: EMC & Safety Standards
For non ionizing radiation limits, refer to ANSI/IEEE C95.1 > -- > From: Muriel Bittencourt de Liz[SMTP:mur...@grucad.ufsc.br] > Sent: Monday, August 02, 1999 11:42 AM > To: Lista de EMC da IEEE > Subject: EMC & Safety Standards > > > Dear Group, > > I'm making a study on EMC & Safety Standards, and some questions > appeared. I'd like to post them to the group to see if someone can help > me. The questions are: > > # Safety standards seem only to aim the protection the equipment... And > the operator/user of the equipment? Is there any standard for protection > of the user/operator? > > # The VCCI Standard is more restrictive than the European Norms (ENs)?? > > # Is there any standard which covers the effects of Non-Ionizing > Radiation (Electromagnetic Radiation) on the human health? > > I think that's all... Thanks in advance for those who can help! > > > Best Regards, > > Muriel > -- > == > Muriel Bittencourt de Liz > GRUCAD - Grupo de Concep> ção e Análise de Dispositivos Eletromagnéticos > Universidade Federal de Santa Catarina > Caixa Postal - 476 88040-900 - Florianópolis - SC - BRASIL > Fone: +55.48.331.9649 - Fax: +55.48.234.3790 > e-mail: mur...@grucad.ufsc.br > ICQ#: 9089332 > > - 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, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
RE: EMC & Safety Standards
The issue of artifical limits has come up before. Refer VCCI to their own document. The also have the 80/80 statistical limits that CISPR has in their documentation, along with requirements for production line tests. There are no additional mandatory limits in their requlations. If they aren't there they can't impose them (they certainly try often enough and can often be successful but that still doesn't give them any legal authority to do so. Germany tried that for awhile, but I believe has finally gotten that idea beat out of them. Incidentially, even with the 80/80 and other production run tests, I would recommend that you have some corporate direction on what passing really is, a 3 dB or so internal limit is certainly reasonable, but you'll have to have a decision on what you do if you don't meet that internal limit. (Some of your customers may also have something to say on that HP for example generally requires an addtional 3dB 80/80 limits - or atleast the division I have worked with did and they put it into the purchase specifications. Gary -Original Message- From: John Juhasz [mailto:jjuh...@fiberoptions.com] Sent: Tuesday, August 03, 1999 10:08 AM To: 'Muriel Bittencourt de Liz'; Lista de EMC da IEEE Subject: RE: EMC & Safety Standards Muriel, I will only respond on the VCCI issue as others have covered the product safety issue well. The VCCI (Voluntary Control Council for Interference of ITE Equipment)limits are based on the CISPR 22 (EN 55022) limits, with Class A & Class B categories. In my experience with VCCI has shown that although mandatory limits are specified, 'margins' are required. For example, if the limit is 40dBuv, VCCI members would prefer to see a margin of 6dB or 34dBuv. In essence they lower the limit and that's what you have to meet in order for your equipment to be deemed acceptable. The reason for this (as I had been told by a VCCI member company - who I will not name) is that during the manufacturing process of a product, a cable shield may inadvertantly not get grounded, or an ECO (Engineering Change Order) meant to reduce emissions may not get implemented on a specific lot of products, etc. . . therefore the product still has a chance in being compliant. Hope this helps. John A. Juhasz Product Qualification & Compliance Engr. Fiber Options, Inc. 80 Orville Dr. Suite 102 Bohemia, NY 11716 USA Tel: 516-370-1324 Fax: 516-567-8322 -Original Message- From: Muriel Bittencourt de Liz [ mailto:mur...@grucad.ufsc.br <mailto:mur...@grucad.ufsc.br> ] Sent: Monday, August 02, 1999 2:43 PM To: Lista de EMC da IEEE Subject: EMC & Safety Standards Dear Group, I'm making a study on EMC & Safety Standards, and some questions appeared. I'd like to post them to the group to see if someone can help me. The questions are: # Safety standards seem only to aim the protection the equipment... And the operator/user of the equipment? Is there any standard for protection of the user/operator? # The VCCI Standard is more restrictive than the European Norms (ENs)?? # Is there any standard which covers the effects of Non-Ionizing Radiation (Electromagnetic Radiation) on the human health? I think that's all... Thanks in advance for those who can help! Best Regards, Muriel -- == Muriel Bittencourt de Liz GRUCAD - Grupo de Concepção e Análise de Dispositivos Eletromagnéticos Universidade Federal de Santa Catarina Caixa Postal - 476 88040-900 - Florianópolis - SC - BRASIL Fone: +55.48.331.9649 - Fax: +55.48.234.3790 e-mail: mur...@grucad.ufsc.br ICQ#: 9089332 - 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, jim_bac...@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, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
RE: EMC & Safety Standards
Muriel, I will only respond on the VCCI issue as others have covered the product safety issue well. The VCCI (Voluntary Control Council for Interference of ITE Equipment)limits are based on the CISPR 22 (EN 55022) limits, with Class A & Class B categories. In my experience with VCCI has shown that although mandatory limits are specified, 'margins' are required. For example, if the limit is 40dBuv, VCCI members would prefer to see a margin of 6dB or 34dBuv. In essence they lower the limit and that's what you have to meet in order for your equipment to be deemed acceptable. The reason for this (as I had been told by a VCCI member company - who I will not name) is that during the manufacturing process of a product, a cable shield may inadvertantly not get grounded, or an ECO (Engineering Change Order) meant to reduce emissions may not get implemented on a specific lot of products, etc. . . therefore the product still has a chance in being compliant. Hope this helps. John A. Juhasz Product Qualification & Compliance Engr. Fiber Options, Inc. 80 Orville Dr. Suite 102 Bohemia, NY 11716 USA Tel: 516-370-1324 Fax: 516-567-8322 -Original Message- From: Muriel Bittencourt de Liz [mailto:mur...@grucad.ufsc.br] Sent: Monday, August 02, 1999 2:43 PM To: Lista de EMC da IEEE Subject: EMC & Safety Standards Dear Group, I'm making a study on EMC & Safety Standards, and some questions appeared. I'd like to post them to the group to see if someone can help me. The questions are: # Safety standards seem only to aim the protection the equipment... And the operator/user of the equipment? Is there any standard for protection of the user/operator? # The VCCI Standard is more restrictive than the European Norms (ENs)?? # Is there any standard which covers the effects of Non-Ionizing Radiation (Electromagnetic Radiation) on the human health? I think that's all... Thanks in advance for those who can help! Best Regards, Muriel -- == Muriel Bittencourt de Liz GRUCAD - Grupo de Concepção e Análise de Dispositivos Eletromagnéticos Universidade Federal de Santa Catarina Caixa Postal - 476 88040-900 - Florianópolis - SC - BRASIL Fone: +55.48.331.9649 - Fax: +55.48.234.3790 e-mail: mur...@grucad.ufsc.br ICQ#: 9089332 - 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, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
RE: EMC & Safety Standards
Muriel, First of all these answers are based on my knowledge of the safety standards for Information Technology Equipment and Test Equipment, which is what our company produces. # Safety standards seem only to aim the protection the equipment... And the operator/user of the equipment? Is there any standard for protection of the user/operator? Safety standards are for the protection of the user/operator and to some extent, maintenance personnel. They don't really cover protection of the equipment. In fact in the Information Technology Equipment standards (UL 1950, IEC 950, and EN 60950) the equipment will not fail if the equipment catches fire so long as the fire doesn't spread outside of the equipment or emit to much toxic smoke/gases i.e. not a hazard to personnel. # The VCCI Standard is more restrictive than the European Norms (ENs)?? Not sure about this one. As far as I know the VCCI standards are Japanese EMC only standards. I'm not sure how they compare to the EN standards for EMC. I imagine someone else in the group can elaborate on this one. # Is there any standard which covers the effects of Non-Ionizing Radiation (Electromagnetic Radiation) on the human health? The standards I have only deal with Ionizing radiation. All safety standards are product specific i.e. each standard has a scope which indicates what type of equipment it is to be used for. You must use the proper standard for your type of equipment. For instance the IEC 1010-1 standard has the following scope-"This international standard specifies general safety requirements for electrical equipment intended for professional, industrial process, and educational use, including equipment and computing devices for: measurement and test, control, laboratory use, and accessories intended for use with the above. (e.g. sample handling equipment)." You only need to meet the requirements of the standard for your type of equipment. So if the standard required for your type of equipment has something about Non-ionizing radiation then you would need to address that. If it has no requirement, you don't need to worry about it. Hope this helps. Kurt Andrews Compliance Engineer Tracewell Systems, Inc. 567 Enterprise Dr. Westerville, OH 43081 Ph. 614-846-6175 Fax 614-846-7791 Email: kandr...@tracewell.com -Original Message- From: Muriel Bittencourt de Liz [SMTP:mur...@grucad.ufsc.br] Sent: Monday, August 02, 1999 2:43 PM To: Lista de EMC da IEEE Subject:EMC & Safety Standards Dear Group, I'm making a study on EMC & Safety Standards, and some questions appeared. I'd like to post them to the group to see if someone can help me. The questions are: # Safety standards seem only to aim the protection the equipment... And the operator/user of the equipment? Is there any standard for protection of the user/operator? # The VCCI Standard is more restrictive than the European Norms (ENs)?? # Is there any standard which covers the effects of Non-Ionizing Radiation (Electromagnetic Radiation) on the human health? I think that's all... Thanks in advance for those who can help! Best Regards, Muriel -- == Muriel Bittencourt de Liz GRUCAD - Grupo de Concepção e Análise de Dispositivos Eletromagnéticos Universidade Federal de Santa Catarina Caixa Postal - 476 88040-900 - Florianópolis - SC - BRASIL Fone: +55.48.331.9649 - Fax: +55.48.234.3790 e-mail: mur...@grucad.ufsc.br ICQ#: 9089332 - 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, jim_bac...@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, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
RE: EMC & Safety Standards
My comments are embedded below. -- From: Muriel Bittencourt de Liz [SMTP:mur...@grucad.ufsc.br] Sent: Monday, August 02, 1999 2:43 PM To: Lista de EMC da IEEE Subject: EMC & Safety Standards Dear Group, I'm making a study on EMC & Safety Standards, and some questions appeared. I'd like to post them to the group to see if someone can help me. The questions are: # Safety standards seem only to aim the protection the equipment... And the operator/user of the equipment? Is there any standard for protection of the user/operator? The international safety standard that is used for Information Technology Equipment and Business Equipment is IEC950. Many countries have adopted this standard as their national standard. The objective of the standard is to prevent all types of hazards including electrical shock, fire, mechanical, chemical, thermal and radiation hazards. The protection applies to the operator and to service persons. # The VCCI Standard is more restrictive than the European Norms (ENs)?? I understand that the VCCI standards are EMC standards. Japan has adopted IEC safety standards including IEC950. However, as many countries do, they have introduced national deviations. You would have to compare Japan's deviations to those of the EU to determine how they affect your equipment. All of these deviations may be found in the CB Bulletin which is published by the IEC. # Is there any standard which covers the effects of Non-Ionizing Radiation (Electromagnetic Radiation) on the human health? ICNIRP Guidelines:1998 IEEE C95.1:1991 ENV 50166-1:1995 ENV 50166-2:1995 NRPB Vol 4. No. 5:1993 VDE 0848-2:1982 VDE0848-4:1989 ACGIH Guidelines:1999 I think that's all... Thanks in advance for those who can help! Best Regards, Muriel -- == Muriel Bittencourt de Liz GRUCAD - Grupo de Concepção e Análise de Dispositivos Eletromagnéticos Universidade Federal de Santa Catarina Caixa Postal - 476 88040-900 - Florianópolis - SC - BRASIL Fone: +55.48.331.9649 - Fax: +55.48.234.3790 e-mail: mur...@grucad.ufsc.br ICQ#: 9089332 - 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, jim_bac...@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, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
