Responses: What is Class 1, Div. 1 Group D?
6057 Hello! My name is Paul Kelly and I am in charge of UL's Hazardous Locations section here at our Northbrook, Illinois office. Mike Windler forwarded your question to me regarding Class I, Division 1, Group D and I hope that the following proves helpful: 1. The marking string "Class I (Roman Numeral One), Division 1 (Arabic Numeral One), Group D" defines the characteristics of a "hazardous" (i.e. potentially explosive) area in accordance with the National Electrical Code (NEC). See Articles 500 and 501 of 1996 NEC. 2. Class I indicates that the "hazard" is flammable gases, vapors or liquids. 3. Division 1 indicates that the "hazard" is likely to exist all of the time or some of the time. 4. Group D indicates that the ignition-related properties of the "hazard" are similar to propane. 5. Equipment installed in such areas must be protected by one of the following methods - explosionproof, intrinsic safety or purging/pressurization. 6. Explosionproof is a protection method that relies on the enclosure of an incendive arcing part to withstand the impact of an internal explosion and to prevent propagation of any flames from the inside to the outside of the enclosure. The U.S. requirements for this protection method are contained in ANSI/UL1203, "Explosion-Proof and Dust-IgnitionProof Electrical Equipment for Use in Hazardous (Classified) Locations". 7. Intrinsic Safety is a protection method that does not rely on the enclosure, but instead relies on the "intrinsic design" of the circuitry to not be able to ignite the atmosphere under single or double fault conditions. The U.S. requirements for this protection method are contained in ANSI/UL913, "Intrinsically Safe Apparatus and Associated Apparatus for Use in Class I, II, and III, Division 1, Hazardous (Classified) Locations". 8. Purging/Pressurization is a protection method that relies on the use of a "protective gas" to prevent entry of the hazardous atmosphere into the enclosure of an incendive arcing part. The U.S. requirements for this protection method are contained in ANSI/NFPA496, "Purged and Pressurized Enclosures for Electrical Equipment". Note: Please realize that these "definitions" in Items 6, 7 and 8 above are only intended to convey the basic concepts of each protection method. 9. Equipment utilizing any of the above protection methods can obtain a "rating" of Class I, Division 1, Group D - but the certification evaluation would be distinctly different for each. 10. UL has an educational poster that details all of the above information - and a good deal more. If you would like complimentary copies of this poster, just let me know your address and how many you could use and I can have them mailed to you. Let me know if I can provide any further assistance... Paul T. Kelly Associate Managing Engineer Hazardous Locations E-mail: kel...@ul.com The question was : __ Reply Separator _ Subject: What is Class 1, Div. 1 Group D? Author: bach...@ccmail.mmsday.com (BACHERJ) at Internet_Gateway List-Post: emc-pstc@listserv.ieee.org Date:6/9/ 0 8:14 AM Yesterday we had a customer call asking if our products were Class 1, Div. 1, Group D compliant. Can anyone tell me where I can get information on what it is and what it takes to meet it? Jim Bacher Paxar-Monarch bach...@monarch.com
Re: What is Class 1, Div. 1 Group D?
Jim, Try National Electrical Code Article 500 Hazardous (Classified) Locations Class 1 is locations where "flammable gases or vapors are or may be in the air in quantities sufficient to produce explosive or ignitible mixtures" Class 1 Div 1 is as above due to 1) normal conditions, or 2) frequently because of repair operations/leakage/etc, or 3) breakdown/faulty operation Group D is atmospheres such as acetone, ammonia, benzene, butane, cyclopropane, ethanol, gasoline, hexane, methanol, methane, natural gas, naptha, propane, etc If your product carries a rating label with the above Class 1 Div 1 Group D rating and a NRTL mark, you can claim to meet this performance level. If not, I suggest to contact UL in Northbrook IL at 847-272-8800 to discuss evaluating your product. I used to work at Square D Co., which makes HazLoc electrical equipment, and was responsible for building an in-house hydrogen-air testing facility, plus testing with UL witnessing our tests for Listing. My company helps manufacturers get UL and other agency certifications. If we can help, feel free to contact me. Mike Harris Teccom Co. tecco...@i-cafe.net 707-258-1360/fax 1361 -- > From: BACHERJ > To: emc-p...@majordomo.ieee.org > Subject: What is Class 1, Div. 1 Group D? > Date: Tuesday, June 09, 1998 5:14 AM > > Yesterday we had a customer call asking if our products were Class 1, Div. > 1, Group D compliant. Can anyone tell me where I can get information on > what it is and what it takes to meet it? > > Jim Bacher > Paxar-Monarch > bach...@monarch.com
Class 1 Div 1 Group D
Jim, You can get further information on Class 1, Div 1, Group D from Factory Mutual Research Corporation (FMRC) and from UL and CSA. FMRC both have wall charts giving information on what the various Classes, Divisions and Groups mean. I think FM's is better but then I am biased. Contact number for FM is (781) 762 4851 if you want to get hold of one. Or you can email at; approv...@factory-mutual.com Nick Ludlam
RE: What is Class 1, Div. 1 Group D?
Jim, I'm not positive but that sounds like classifications under a Hazardous Locations safety standard (UL or CSA) ... I don't have any on hand to verify. Kaz Gawrzyjal Nortel k...@nortel.com > -Original Message- > From: bach...@ccmail.mmsday.com [SMTP:bach...@ccmail.mmsday.com] > Sent: Tuesday, June 09, 1998 6:14 AM > To: emc-p...@majordomo.ieee.org > Subject: What is Class 1, Div. 1 Group D? > > Yesterday we had a customer call asking if our products were Class 1, Div. > > 1, Group D compliant. Can anyone tell me where I can get information on > what it is and what it takes to meet it? > > Jim Bacher > Paxar-Monarch > bach...@monarch.com
FW: What is Class 1, Div. 1 Group D?
Jim: If you have to ask, chances are your products are not compliant, much less approved. A source for information is a safety approval agency such as UL, Factory Mutual, or CSA. Call them or check their web sites for free information. In short, Class I (roman numeral I) is an area where flammable gases, vapors, or liquids may be present. Division 1 is "where ignitable concentrations of flammable gases, vapors, or liquids can exist all of the time or some of the time under normal operating conditions." Group D tells you that the gas in question is propane. To be compliant, a product must be designed, and tested by an approved agency to demonstrate that sparks, or excessive operating temperatures which could cause ignition of the gas, do not exist, and cannot exist even with a fault. Hope this helps. I suggest you tell the customer NO. Jacob Z. Schanker, P.E. Director of Agency Compliance California Microwave 716 242 8454 (voice) 716 242 8427 (fax) j.schan...@mdsroc.com ---> >-- >From: bach...@ccmail.mmsday.com[SMTP:bach...@ccmail.mmsday.com] >Sent: Tuesday, June 09, 1998 8:14 AM >To:emc-p...@majordomo.ieee.org >Subject: What is Class 1, Div. 1 Group D? > >Yesterday we had a customer call asking if our products were Class 1, >Div. >1, Group D compliant. Can anyone tell me where I can get information >on >what it is and what it takes to meet it? > >Jim Bacher >Paxar-Monarch >bach...@monarch.com >
What is Class 1, Div. 1 Group D?
Yesterday we had a customer call asking if our products were Class 1, Div. 1, Group D compliant. Can anyone tell me where I can get information on what it is and what it takes to meet it? Jim Bacher Paxar-Monarch bach...@monarch.com
