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

Acetylene

A

IIC

Hydrogen

B

(IIB + H2)

Ethylene

C

IIB

Propane

D

IIA

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CONTINUATION:

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

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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.