Applicable to Class I and II, Division 2 and Class III, Divisions 1 and 2 locations

This standard applies only to equipment, circuits, and components 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 or in the Canadian Electrical Code (CEC) CSA C22.1.

NOTE 1 Some equipment designed for use in unclassified locations is permitted by the NEC^® or CEC for installation in Division 2 locations. The judgment of acceptability for the installation would be determined by the authority having jurisdiction. Such equipment would not have the hazardous location marking or documentation described in this standard. It is anticipated that such equipment would comply with the other requirements in this standard and that the determination of compliance is elementary (e.g., a nonarcing instrument inside a Type 4 or Type 12 enclosure used in a Class II, Division 2 location).

NOTE 2 Throughout this standard, reference to CAN/CSA C22.2 No. 60079-0 and ANSI/ISA 60079-0 are made as CSA/ISA 60079-0. Similarly reference to CAN/CSA C22.2 No. 60079-1 and ANSI/ISA 60079-1 are made as CSA/ISA 60079-1. Similarly reference to CAN/CSA C22.2 No. 60079-11 and ANSI/ISA 60079-11 are made as CSA/ISA 60079- 11. Similarly reference to CAN/CSA C22.2 No. 60079-15 and ANSI/ISA 60079-15 are made as CSA/ISA 60079-15.

NOTE 3 The US and Canadian adoptions of IEC 60079-0, IEC 60079-1, IEC 60079-11 and IEC 60079-15 may be adopted at different revision levels and may have different National Deviations.

Applicable to associated nonincendive field wiring apparatus

This standard also applies to associated nonincendive field wiring apparatus located in a nonhazardous (unclassified) location specifically designed to directly connect to nonincendive field wiring in Class I and II, Division 2 and Class III, Divisions 1 and 2 hazardous (classified) locations.

NOTE The 2015 CEC does not address nonincendive field wiring circuits in Class II or Class III hazardous locations.

Applicable ambient conditions

The requirements of this standard are based on consideration of the following ambient conditions:

a) A lower ambient temperature of -50°C or higher.

b) An upper ambient temperature of 40 °C or lower.

c) An oxygen concentration of not greater than 21 percent by volume.

d) A pressure of 80 kPa (0.8 bar) to 110 kPa (1.1 bar) .

NOTE Equipment specified for atmospheric conditions beyond the above limits may be subject to additional investigation.

Not applicable to specified ignition mechanisms

This standard is not applicable to mechanisms of ignition from external sources, such as static electricity or lightning, that are not related to the electrical characteristics of the equipment.

Not applicable to specific products

This standard does not apply to electric luminaires for use in Division 2 hazardous (classified) locations.

This standard does not apply to electric motors, electric heaters, heat tracing cables, and similar heat-producing products, except where they are an integral part of the equipment under evaluation, for use in Division 2 locations. Where electric motors, electric heaters, heat tracing cables or similar heat-producing products are an integral part of the equipment under evaluation, applicable requirements from the Division 2 hazardous locations standards for these products shall be considered.

In the United States, this standard does not apply to battery-operated flashlights and lanterns within the scope of ANSI/UL 783.

Purpose

The 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 I I, Division 2 and Class III, Divisions 1 and 2hazardous (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 maycontain electronic components used in anincendive circuit and may also have field wiring that is anincendive circuit.

In addition, it is the intent of this document to establish uniformity in test methods for determiningthe 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.

This 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.

NOTE Some equipment designed for use in unclassified locations is permitted by the NEC® for installing in Division 2 locations. The judgment of acceptability for the installation would be determined by the authority having jurisdiction. Such equipment would not have the hazardous location marking or documentation described in this standard. It is anticipated that such equipment would comply with the other requirements in this standard and that the determination of compliance is elementary (e.g., a nonarcing instrument inside a NEMA Type 4 or 12 enclosure used in a Class II, Division 2 location).

This standard also applies to certain unclassified location equipment specifically designed to directly connect to nonincendive field wiring in Class I and II, Division 2 and Class III, Divisions 1 and 2 hazardous (classified) locations as defined in the NEC®.

This standard is primarily intended to provide requirements for electrical and electronic test, measuring, and controlling equipment.

This standard is concerned only with equipment construction and test criteria related to electrical or thermal ignition of specified flammable gases, vapors, combustible dusts, fibers, and flyings in air.

This standard is not intended to cover equipment for use in Class I and Class II, Division 1 locations, such as equipment constructed to be intrinsically safe, dust ignition-proof, or explosionproof. Such equipment is, however, suitable for use in Class I and Class II, Division 2 locations in the same group and temperature class for which it is suitable in Division 1.

This standard does not cover mechanisms of ignition from external sources, such as static electricity or lightning, that are not related to the electrical characteristics of the equipment.

This standard is not intended as an instructional manual for untrained persons. It is intended to promote uniformity of practice among those skilled in the area of design, construction, and application of equipment suitable for Class I and Class II, Division 2 and Class III, Divisions 1 and 2 locations.

The requirements of this standard are based on consideration of ignition in locations made hazardous by the presence of flammable gases, vapors, combustible dusts, fibers, and flyings under the following ambient conditions:

a) an ambient temperature of -25°C to 40°C

b) an oxygen concentration of not greater than 21 percent by volume

c) a pressure of 80 kPa (0.8 bar) to 110 kPa (1.1 bar)

NOTE If equipment is specified to operate in conditions outside the ranges listed above, the requirements of this standard may not ensure the desired level of safety.

This standard covers portable battery-powered equipment other than flashlights and lanterns for Class I and Class II, Division 2, and Class III, Divisions 1 and 2 hazardous (classified) locations.

This standard does not cover electric luminaires for use in Division 2 hazardous (classified) locations.

This standard does not cover electric motors, electric heaters, heat tracing cables, and similar heat-producing devices, except where they are an integral part of the equipment under evaluation, for use in Division 2 locations.

This standard does not cover AEx requirements for equipment for use in Class I, Zone 2 hazardous (classified) locations.

This standard does not cover the requirements for equipment for use in Zone 20, Zone 21 or Zone 22.

Purpose

The 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 f ield 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.

This 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. NOTE Some equipment designed for use in unclassified locations is permitted by the NEC®for installing in Division 2 locations. The judgment of acceptability for the installation would b e determined by the authority having jurisdiction. Such equipment would not have the hazardous location marking or documentation described in this standard. It is anticipated that such equipment would comply with the other requirements in this standard and that the determination of compliance is elementary (e.g., a nonarcing instrument inside a NEMA Type 4 or 12 enclosure used in a Class II, Division 2 location).

This standard also applies to certain unclassified location equipment specifically designed to directly connect to nonincendive field wiring in Class I and II, Division 2 and Class III, Divisions 1 and 2 hazardous (classified) locations as defined in the NEC®.

This standard is primarily intended to provide requirements for electrical and electroni c test, measuring, and controlling equipment.

This standard is concerned only with equipment construction and test criteria related to electrical or thermal ignition of specified flammable gases, vapors, combustible dusts, fibers, and flyings in air.

This standard is not intended to cover equipment for use in Class I and Class II, Division 1 locations, such as equipment constructed to be intrinsically safe, dust ignition-proof, or explosion-proof. Such equipment is, however, suitable for use in Class I and Class II, Division 2 locations in the same group and temperature class for which it is suitable in Division 1.

This standard does not cover mechanisms of ignition from external sources, such as static electricity or lightning, that are not related to the electrical characteristics of the equipment.

This standard is not intended as an instructional manual for untrained persons. It is intended to promote uniformity of practice among those skilled in the area of design, construction, and application of equipment suitable for Class I and Class II, Division 2 and Class III, Divisions 1 and 2 locations.

The requirements of this standard are based on consideration of ignition in locations made hazardous by the presence of flammable gases, vapors, combustible dusts, fibers, and flyings under the following ambient conditions:

a) an ambient temperature of -25°C to 40°C

b) an oxygen concentration of not greater than 21 percent by volume

c) a pressure of 80 kPa (0.8 bar) to 110 kPa (1.1 bar)

NOTE If equipment is specified to operate in conditions outside the ranges listed above, the requirements of this standard may not ensure the desired level of safety.

This standard covers portable battery-powered equipment other than flashlights and lanterns for Class I and Class II, Division 2, and Class III, Divisions 1 and 2 hazardous (classified) locations.

This standard does not cover electric luminaires for use in Division 2 hazardous (classified) locations.

This standard does not cover electric motors, electric heaters, heat tracing c ables, and similar heat-producing devices, except where they are an integral part of the equipment under evaluation, for use in Division 2 locations.

This standard does not cover AEx requirements for equipment for use in Class I, Zone 2 hazardous (classified) locations.

This standard does not cover the requirements for equipment for use in Zone 20, Zone 21 or Zone 22.

Purpose

The 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.