RE: Class I Division 1 versus Class I Division 2
Robert, I don't have the answer, but if you review Article 500 of the National Electric Code (NEC) and UL's website you may be enlightened. http://www.ul.com/hazloc/ Best Regards, Jody Leber Laboratory Manager jle...@ustech-lab.com http://www.ustech-lab.com U. S. Technologies 3505 Francis Circle Alpharetta, GA 30004 770.740.0717 Fax: 770.740.1508 -Original Message- From: Loop, Robert [SMTP:rl...@hnt.wylelabs.com] Sent: Thursday, March 15, 2001 11:13 AM To: emc-p...@majordomo.ieee.org Subject:Class I Division 1 versus Class I Division 2 Hello Group, I need some education on Classified/Hazardous locations. What is the difference between a product that is certified to Class I Division 1 versus Class I Division 2? If I had a product that was certified to Division 2, what would be needed to make it pass Division 1 requirements? I apologize for my ignorance, there are simply too many standards out there and this is out of my league. Sincerely, Robert Loop Engineering Supervisor Wyle Laboratories Product Safety ph - (256) 837-4411 x313 fax- (256) 721-0144 e-mail: rl...@hnt.wylelabs.com --- 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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://www.rcic.com/ click on Virtual Conference Hall, --- 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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://www.rcic.com/ click on Virtual Conference Hall,
Re: Class I Division 1 versus Class I Division 2
Div 1 = normally hazardous. Div 2 = only hazardous in the event of a failure (e.g. ventilation breakdown, pipe/tank rupture). For that reason, Div 2 hardware need only pass in the normal operating state, no circuit faults are considered. The logic being applied is that two unrelated faults are not going to happen at the same time. It's very easy for many types of product to pass the Div. 2 requirements with little or no modification. Div. 1 is another matter. The product has to be made to be effectively intrinsically safe. It cannot be capable of causing ignition via spark or temperature with any two induced failures. You'll need to learn about diode barriers, purged enclosures, and explosion proof technologies to decide whether you want to proceed with this compliance. If you're still interested, then I suggest that you got to the NFPA site and purchase Electrical Installations in Hazardous Locations at: http://www.nfpacatalog.org/cgi-bin/SoftCart.exe/STORE/PAGES/HLH-97.htm?L+nfpanonmembers+tbba4286 Best of luck, Carl From: Loop, Robert rl...@hnt.wylelabs.com on 03/15/2001 11:13 AM Please respond to Loop, Robert rl...@hnt.wylelabs.com To: emc-p...@majordomo.ieee.org cc:(bcc: Carl Newton/XYCOM) Subject: Class I Division 1 versus Class I Division 2 Hello Group, I need some education on Classified/Hazardous locations. What is the difference between a product that is certified to Class I Division 1 versus Class I Division 2? If I had a product that was certified to Division 2, what would be needed to make it pass Division 1 requirements? I apologize for my ignorance, there are simply too many standards out there and this is out of my league. Sincerely, Robert Loop Engineering Supervisor Wyle Laboratories Product Safety ph - (256) 837-4411 x313 fax- (256) 721-0144 e-mail: rl...@hnt.wylelabs.com --- 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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://www.rcic.com/ click on Virtual Conference Hall, --- 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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://www.rcic.com/ click on Virtual Conference Hall,
RE: Class I Division 1 versus Class I Division 2
Robert, Check out the National Electric Code (NFPA 70) Article 500-7(a) and 500-7(b) for your answer, but simply stated, In a Division 1 location, the hazardous atmosphere is assumed to be present under normal conditions, and a Division 2 location, the hazardous atmosphere is present under abnormal conditions (a chemical spill, leak, etc.) What is needed to bring a Division 2 product into compliance with Division 1 requirements? It ultimately depends on what the product is, and what method of protection was employed. I will assume that the Division 2 product was evaluated as a Non-Incendive product, if this is the case, then that product was only investigated under normal operating conditions. To upgrade the certification to a Division 1 location, one would have to look at the product operating under normal operating conditions, a single fault condition, and also a double fault condition (whichever is worst case...NOTE: a double fault is not always worst case). If you are NOT using Non-Incendive/Intrinsic Safety type protection then I would have to have a little more information about the product as well as the method of protection being used. Contact the lab who did the original certification, they should have some intimate knowledge of the product and be able to tell you after reviewing the original investigation data if upgrading to a Division 1 classification would even be possible for the product, but be forewarned, it is usually not a simple process and may require some rather severe product modifications. Kevin Robinson Senior Project Engineer/QA Safety Laboratory MET Laboratories The Nation's FIRST NRTL Phone: (410) 354-3300 x 361 Fax: (410) 354-3313 -Original Message- From: Loop, Robert [SMTP:rl...@hnt.wylelabs.com] Sent: Thursday, March 15, 2001 11:13 AM To: emc-p...@majordomo.ieee.org Subject: Class I Division 1 versus Class I Division 2 Hello Group, I need some education on Classified/Hazardous locations. What is the difference between a product that is certified to Class I Division 1 versus Class I Division 2? If I had a product that was certified to Division 2, what would be needed to make it pass Division 1 requirements? I apologize for my ignorance, there are simply too many standards out there and this is out of my league. Sincerely, Robert Loop Engineering Supervisor Wyle Laboratories Product Safety ph - (256) 837-4411 x313 fax- (256) 721-0144 e-mail: rl...@hnt.wylelabs.com --- 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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://www.rcic.com/ click on Virtual Conference Hall, --- 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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://www.rcic.com/ click on Virtual Conference Hall,
Re: Class I Division 1 versus Class I Division 2
Robert: To my best recollection, the essential difference is that Div. 2 is an environment subject to occasional presence (leaks) of flammable/explosive gases, while Div. 1 is where this stuff is always present or potentially present. I suppose this is a simplification, but I think it expresses things correctly. What you need to do, is ideally, to design for Div 1 in the first place. I mean that it is engineering's job to design for Div 1 NOT test or safety's job to obtain compliance to Div 1. That said, I know that's not how it often works. I had good results with Factory Mutual in doing testing and gaining approvals for hazardous locations. Hazardous location design has many departures from the usual UL 1950/ 60950 type safety considerations. Regards, Jack Jacob Z. Schanker, P.E. 65 Crandon Way Rochester, NY 14618 Phone: 716 442 3909 Fax: 716 442 2182 j.schan...@ieee.org - Original Message - From: Loop, Robert rl...@hnt.wylelabs.com To: emc-p...@majordomo.ieee.org Sent: Thursday, March 15, 2001 11:13 AM Subject: Class I Division 1 versus Class I Division 2 Hello Group, I need some education on Classified/Hazardous locations. What is the difference between a product that is certified to Class I Division 1 versus Class I Division 2? If I had a product that was certified to Division 2, what would be needed to make it pass Division 1 requirements? I apologize for my ignorance, there are simply too many standards out there and this is out of my league. Sincerely, Robert Loop Engineering Supervisor Wyle Laboratories Product Safety ph - (256) 837-4411 x313 fax- (256) 721-0144 e-mail: rl...@hnt.wylelabs.com --- 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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://www.rcic.com/ click on Virtual Conference Hall, --- 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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://www.rcic.com/ click on Virtual Conference Hall,
Re: Class I Division 1 versus Class I Division 2
Hello Robert, A visit to the Safety Link www.safetylink.com and an in-page search on the term hazloc will deliver you to a spot within the Safety Link with several very good tutorials and other resources on this topic. Regards, Art Michael Int'l Product Safety News A.E. Michael, Editor 166 Congdon St. East P.O. Box 1561 Middletown CT 06457 U.S.A. Phone : (860) 344-1651 Fax: (860) 346-9066 Email : i...@connix.com Website: http://www.safetylink.com ISSN : 1040-7529 -- On Thu, 15 Mar 2001, Loop, Robert wrote: Hello Group, I need some education on Classified/Hazardous locations. What is the difference between a product that is certified to Class I Division 1 versus Class I Division 2? If I had a product that was certified to Division 2, what would be needed to make it pass Division 1 requirements? I apologize for my ignorance, there are simply too many standards out there and this is out of my league. Sincerely, Robert Loop Engineering Supervisor Wyle Laboratories Product Safety ph - (256) 837-4411 x313 fax- (256) 721-0144 e-mail: rl...@hnt.wylelabs.com --- 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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://www.rcic.com/ click on Virtual Conference Hall, --- 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: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@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://www.rcic.com/ click on Virtual Conference Hall,
