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 Heald davehe...@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 Heald davehe...@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,"
