Here in Huntington Indiana, NIPSCO specified their own intrinsically safe barrier. It was a Peppler Fuchs from Newark, part #81C8243, PF Catalog # KFD2-SR2-EX2.W. Wired contacts from Nipsco meter to intrinsically safe relay in Nema-4X box 10' away from meter. See link to barrier below and reference EX 0,1,2, Div 1,2 environment.
Not an expert defining customer's classifications, but we are using this for pulse counting natural gas consumption from providers meter.
Paul C.
http://www.farnell.com/datasheets/1919433.pdf?_ga=1.149296054.1034508146.1449075413
IEC 60079-10.1 Classification of areas - Explosive gas atmospheres
| Zone | Nature and Probability of Hazard Material |
|---|
| Zone 0 | Ignitable concentrations of flammable gases or vapors which are present continuously or for long periods of time. |
| Zone 1 | Ignitable concentrations of flammable gases or vapors which are likely to occur under normal operating conditions. |
| Zone 2 | Ignitable concentrations of flammable gases or vapors which are not likely to occur under normal operating conditions and do so only for a short period of time. |
Dusts
IEC 60079-10.2 Classification of areas - Combustible dust atmospheres
| Zone | Nature and Probability of Hazard Material |
|---|
| Zone 20 | An area where combustible dusts or ignitable fibers and flyings are present continuously or for long periods of time. |
| Zone 21 | An area where combustible dusts or ignitable fibers and flyings are likely to occur under normal operating conditions. |
| Zone 22 | An area where combustible dusts or ignitable fibers and flyings are not likely to occur under normal operating conditions and do so only for a short period of time. |
Zones compares to classes and divisions in the North American Class/Division system.
Group
Group define the type of hazardous material and (partly) the location of the surrounding atmosphere. Group is divided in three groups where group I is reserved for mining locations.
| Group | Type of Hazardous Material and Location of Atmosphere |
|---|
| Group I | | Mines
susceptible to firedamp (flammable mixture of gases naturally occurring in a mine). |
| Group II | | Explosive gas
atmosphere other than mines susceptible to firedamp. Group II equipment is subdivided into three subgroups. |
