Safety Data

SAFETY DATA SHEET (U.L. Hazardous Location Standards)

Class I, Division 1

A Class I, Division 1 location is a location where ignitable concentrations of flammable gases, vapors or liquids:

  • can exist under normal operating conditions;

  • may exist frequently because of repair or maintenance operations or because of leakage; or

  • may exist because of equipment breakdown that simultaneously causes the equipment to become a source of ignition

Equipment intended for use in a Class I , Division 1 area is usually of the explosion-proof, intrinsically safe, or purged/pressurized type Explosion-proof

Explosion-proof apparatus: "Apparatus enclosed in a case that is capable of withstanding an explosion of a specified gas or vapor that may occur within it and of preventing the ignition of a specified gas or vapor surrounding the enclosure by sparks, flashes, or explosion of the gas or vapor within and that operates at such an external temperature that a surrounding flammable atmosphere will not be ignited thereby." (See NFPA 70)

Intrinsically safe apparatus: "Apparatus in which all the circuits are intrinsically safe." (See UL 913)

Intrinsically safe circuit: "A circuit in which any spark or thermal effect is incapable of causing ignition of a mixture of flammable or combustible material in air under prescribed test conditions." (See UL 913)

Purging: "The process of supplying an enclosure with a protective gas at a sufficient flow and positive pressure to reduce the concentration of any flammable gas or vapor initially present to an acceptable level."

(See NFPA 496)

Pressurization:"The process of supplying an enclosure with a protective gas with or without continuous flow at sufficient pressure to prevent the entrance of a flammable gas or vapor, a combustible dust, or an ignitable fiber." (See NFPA 496)

Class I, Division 2

A Class I, Division 2 location is a location:

  • where volatile flammable liquids or flammable gases or vapors exist, but are normally confined within closed containers;

  • where ignitable concentrations of gases, vapors or liquids are normally prevented by positive mechanical ventilation; or

  • adjacent to a Class I, Division 1 location, where ignitable concentrations might be occasionally communicated.

Equipment intended for use in a Class I, Division 2 area is usually of the nonincendive, non-sparking, purged/pressurized, hermetically sealed, or sealed device type.

Nonincendive circuit: "A circuit in which any arc or thermal effect produced under intended operating conditions of the equipment is not capable, under the test conditions specified, of igniting the specified flammable gas- or vapor- air mixture."(See UL 1604)

Nonincendive component: "A component having contacts for making or breaking an incendive circuit and the contacting mechanism shall be constructed so that the component is incapable of igniting the specified flammable gas- or vapor-air mixture. The housing of a nonincendive component is not intended to:

  • exclude the flammable atmosphere, or

  • contain an explosion." (See UL 1604)

Nonincendive field circuit: "A circuit that enters or leaves the equipment enclosure and that under intended operating conditions is not capable, under the test conditions specified, of igniting the specified flammable gas- or vapor-air mixture or combustible dust." (See UL 1604)

Non-sparking apparatus: "Apparatus that has no normally arcing parts or thermal effects capable of ignition. Examples of normally arcing parts are relays, circuit breakers, servo-potentiometers adjustable resistors, switches, non-latching type connectors and motor brushes. (See UL 1604)

Purging: See definition under Class I, Division 1

Pressurization: See definition under Class I, Division 1

Hermetically sealed component: "A component that is sealed against entrance of an external atmosphere and in which the seal is made by fusion, such as soldering, brazing, welding, or the fusion of glass to metal." (See UL 1604)

Sealed device: "A device that is constructed so that it cannot be opened, has no external operating mechanisms, and is sealed to restrict entry of an external atmosphere without relying on gaskets. The device may contain arcing parts or internal hot surfaces." (See UL 1604)

Class II, Division 1

A Class II, Division 1 location is a location where:

  • ignitable concentrations of combustible dust can exist in the air under normal operating conditions;

  • ignitable concentrations of combustible dust may exist because of equipment breakdown that simultaneously causes the equipment to become a source of ignition; or

  • electrically conductive combustible dusts may be present in hazardous quantities.

Equipment intended for use in a Class II, Division 1 area is usually of the dust-ignition-proof, intrinsically safe, or pressurized type.

Dust-ignition-proof : "Enclosed in a manner that will exclude dusts and, where installed and protected in accordance with the NEC, will not permit arcs, sparks or heat otherwise generated or liberated inside of the enclosure to cause ignition of exterior accumulations or atmospheric suspensions of a specified dust on or in the vicinity of the enclosure." (See NFPA 70)

Intrinsically safe: See definitions under Class I, Division 1.

Pressurization: See definition under Class I, Division 1.

Class II, Division 2

A Class II, Division 2 location is a location where:

  • combustible dust is not normally in the air in ignitable concentrations;

  • dust accumulations are normally insufficient to interfere with normal operation of electrical equipment;

  • dust may be in suspension in the air as the result of infrequent malfunctioning of equipment; or

  • dust accumulation may be sufficient to interfere with safe dissipation of heat or may be ignitable by abnormal operation.

Equipment intended for use in a Class II, Division 2 area is usually of dust tight nonincendive, non-sparking, or pressurized types.

DusttightDust tight "Constructed so that dust will not enter the enclosing case under specified test conditions. An example of such conditions would be a UL Type 12 enclosure." (See NFPA 70)

Nonincendive: See definitions under Class I, Division 2

Non-sparking: See definition under Class I, Division 2

Pressurization: See definition under Class I, Division 1.

Class III, Division 1

A Class III, Division 1 location is a location where easily ignitable fibers or materials producing combustible flyings are handled, manufactured or used.

Equipment intended for use in a Class III, Division 1 area is usually of dust tight, intrinsically safe type (both previously defined).

Class III, Division 2

A Class III, Division 2 location is a location where easily ignitable fibers are stored or handled.

Equipment intended for use in a Class III, Division 1 area is usually of the dust tight or intrinsically safe type (both previously defined).

Classes

Class I

Flammable gases or vapors are present in the air in quantities sufficient to produce explosive or ignitable mixtures.

Class II

Combustible or conductive dusts are present.

Class III

Ignitable fibers or flyings are present, but not likely to be in suspension in sufficient quantities to produce ignitable mixtures. (Group classifications are not applied to this class.)

Divisions

Division 1

The substance referred to by class is present during normal conditions.

Division 2

The substance referred to by class is present only in abnormal conditions, such as a container failure or system breakdown.

Groups

Group A

Acetylene

Group B

Hydrogen (or gases of equivalent hazard)

Group C

Ethylene (or gases of equivalent hazard)

Group D

Gasoline (or gases of equivalent hazard)

Group E

Metal Dust

Group F

Coal Dust

Group G

Grain Dust




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