Hazardous Classified Locations

Date: 7/1/2013

Hazardous Classified Locations / Hazardous Areas

Nonincendive Electrical Equipment for Use in Class I and II, Division 2 and Class III, Divisions 1 and 2 Hazardous Classified Locations

According To ISA-12.12.01: The Standards

ISA-12.12.01 Hazardous Classified LocationsThe purpose of this standard is to provide minimum requirements for the design, construction, and marking of electrical equipment or parts of such equipment for use in Class I and Class II, Division 2 and Class III, Divisions 1 and 2 hazardous (classified) locations. This equipment, in normal operation, is not capable of causing ignition of the surrounding atmosphere under the conditions prescribed in this standard, although the equipment may contain electronic components that operate at incendive levels and may also have field wiring that is incendive. In addition, it is the intent of this document to establish uniformity in test methods for determining the suitability of the equipment and associated circuits and components as they relate to potential ignition of a specific flammable gas or vapour-in-air mixture, combustible dust, easily ignitible fibers, or flyings. The standard applies only to equipment, circuits, and components designed specifically for use in Class I and II, Division 2 and Class III, Divisions 1 and 2 hazardous (classified) locations as defined in the National Electrical Code (NEC®) ANSI/NFPA 70.

The Requirements

Requirements for equipment intended to be used in Class I and Class II, Division 2 and Class III, Divisions 1 and 2 hazardous (classified) locations are established on the basis that the equipment in its normal operating condition is not capable of causing ignition of a specified flammable gas, vapor-in-air mixture, dust, fibers, or flyings. The tolerances associated with the components of the equipment shall be considered. Subsequent arcs or thermal effects within the equipment, resulting from opening, shorting, or grounding of nonincendive field wiring, shall be taken into consideration as they affect the suitability of the equipment for use in Division 2 locations. More information

Hazardous Classified Locations

Hazardous Materials

Class/Division System

Zone System

Gasses or Vapours

Class I, Division 2, Groups A, B, C and D

Zone 2

Combustible Dusts

Class II, Division 2, Groups F and G

Zone 22

Fibers or Flyings

Class III, Divisions 1 and 2

No Equivalent

Typical Gas

Class/Division  Gas Groups

Zone Gas Groups






(IIB + H2)







 # # #
ISA, American National Standards Institute ANSI, National Electrical Code (NEC®) and all other brands and product names may be the trademarks or service marks of their respective owners.



Hazardous Areas HMIs and Hazardous Classified Locations HMI Panel PCs-AIS

AIS panel PCs and thin clients with HMI open platforms are designed and certified to meet National Electrical Code (NEC)/Canadian Electrical Code (CEC) Class/Division standards, ATEX Directive 94/9/EC Category 3, IECEx and IEC Zone standards for increased safety in Human Machine Interface (HMI) panels in Division 2 and Zone 2 applications. 

AIS offers UL Class I Division 2 (C1D2 or Class I Div 2), Groups A, B, C, D, T4, ATEX 94/9/EC Category 3 Zone 2, IEC’s IECEx Zone 2, Ex “nA” and Ex “ic” certification on its Hazardous Locations (Hazlocs) & Hazardous Areas panel PCs and open HMI platforms which are primarily designed for the volatile and harsh environments of Oil, Gas, and Petrochemical manufacturing industries. Learn more » 

The standard or custom HMI applications are designed to meet Class I and II, Division 2 and Class III, Divisions 1 and 2 Hazardous (Classified) Locations (North American Classification), and Zone 1/21 and 2/22 Hazardous Areas (European and IEC Classification) specifications.


58福彩 临海市 湖北省 钟祥市 大同市 兰溪市 湘潭市 松滋市 铁力市 彭州市 厦门市 宜春市 邹城市 彭州市 山东省 金昌市 平度市 海南省 双滦区 忻州市 葫芦岛市 十堰市 平度市 潞城市 临沂市 阜新市 普兰店市 汉川市 兴城市 都匀市 枣庄市 安达市 烟台市 高邮市 梅河口市 江油市 白银市 丰城市 孝义市 石首市 池州市 葫芦岛市 福建省 金华市 梅河口市 胶州市 上虞市 大石桥市 江阴市 吉首市 大庆市 铁力市 深州市 山西省 厦门市 项城市 永州市 原平市 明光市 耒阳市