Lightolier HSCXT Series dimensions Ignitible Dust Locations, Class II Locations

Section 7/Folio Q10-33

	HAZARDLINE ENCLOSED INDUSTRIAL HSCXT SERIES
Page 3 of 4	CLASS I, DIVISION 2 LOCATIONS, GROUPS A,B,C,D; CLASS II, DIVISION I AND 2

GROUPS F AND G; CLASS III, DIVISION I, DIVISION 2 LOCATIONS, WET LOCATIONS

IGNITIBLE DUST LOCATIONS

The following hazardous location definitions pertinent to HAZARDLINE are excerpted from Article 500 of the 1990 National Electrical Code.

Class II Locations

Class II locations are those that are hazardous because of the presence of combustible dust. Class II locations shall include those specified in (a) and

(b) below.

(a) Class II, Division 1

A Class II, Division 1 location is a location; (1) in which combustible dust is in the air under normal operating conditions, in quantities sufficient to pro- duce explosive or ignitible mixtures; or (2) where mechanical failure or abnormal operation of machinery or equipment might cause such explosive or ignitible mixtures to be produced, and might also provide a source of igni- tion through simultaneous failure of electrical equipment, operation of pro- tection devices, or from other causes; or (3) in which combustible dusts of an electrically conductive nature may be present in hazardous quantities.

Combustible dusts which are electrically nonconductive include dusts pro- duced in the handling and processing of grain and grain products, pulverized sugar and cocoa, dried egg and milk powders, pulverized spices, starch and pastes, potato and woodflour, oil meal from beans and seed, dried hay, and other organic materials which may produce combustible dusts when processed or handled. Electrically conductive dusts are dusts with a resistiv- ity less than 105 ohm-centimeter.

(b) Class II, Division 2

A Class II, Division 2 location is a location where combustible dust is not normally in the air in quantities sufficient to produce explosive or ignitible mixtures, and dust accumulations are normally insufficient to interfere with the normal operation of electrical equipment or other apparatus, but com- bustible dust may be in suspension in the air as a result of infrequent mal- functioning of handling or processing equipment and where combustible dust accumulations on, in, or in the vicinity of the electrical equipment may be sufficient to interfere with the safe dissipation of heat from electrical equipment or may be ignitible by abnormal operation or failure of electrical equipment.

The quantity of combustible dust that may be present and the adequacy of dust removal systems are factors that merit consideration in determining the classification and may result in an unclassified area.

Where products such as seed are handled in a manner which produces low quantities of dust, the amount of dust deposited may not warrant classifica- tion.

Group F Atmospheres:

Atmospheres containing carbon black, charcoal, coal or coke dusts which have more than 8 percent total volatile material (coal and coke dusts per ADTM 3175-82) or atmospheres containing these dusts sensitized by other materials so that they present an explosion hazard, and having resistivity greater than 102 ohm-centimeter but equal to or less than 108 ohm- centimeter.

Group G Atmospheres:

Atmospheres containing combustible dusts having resistivity of 108 ohm- centimeter or greater.

Class III Locations

Class III locations are those that are hazardous because of the presence of easily ignitible fibers of flyings, but in which such fibers or flyings are not likely to be in suspension in the air in quantities sufficient to produce ignitible mixtures. Class III locations shall include those specified in (a) and

(b) below.

(a) Class III, Division 1

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

Such locations usually include some parts of rayon, cotton, and other textile mills; combustible fiber manufacturing and processing plants; cotton gins and cotton-seed mills; flax-processing plants, clothing manufacturing plants; woodworking plants; and establishments and industries involving similar hazardous processes or conditions.

Easily ignitible fibers and flyings include rayon, cotton (including cotton lin- ters and cotton waste), sisal or henequen, istle, jute, hemp, tow, cocoa fiber, oakum, baled waste kapok, Spanish moss, excelsior and other materials of similar nature.

(b) Class III, Division 2

A Class III, Division 2 location is a location in which easily ignitible fibers are stored or handled.

Exception: In process of Manufacture.

CAUTION: HAZARDLINE is not UL-listed for Group E: Atmospheres containing combustible metal dusts regardless of resistivity, or other combustible dusts of similarly hazardous characteristics hav- ing resistivity of less than 102 ohm-centimeter.

CAUTION: HAZARDLINE Class I, Division 2 is not listed for Division 1 applications where the hazardous atmosphere is expected to be present continuously or periodically during normal operations or frequently because of repair or maintenance operations. For such locations, only appropriate UL-listed explosion-proof equipment is permitted.

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Lightolier a Genlyte Thomas Companywww.lightolier.com Technical Information: (978) 657-7600 • Fax (978) 658-0595

631 Airport Road, Fall River, MA 02720 • (508) 679-8131 • Fax (508) 674-4710 We reserve the right to change details of design, materials and finish.

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