Hazardous Locations: classification of areas

Areas with sealed systems that supply equipment such as a gas-fired boiler are? JATC Hazardous Locations, WB 7

Heavier than air gases are those with a vapor density greater than? JATC Hazardous Locations, WB 7 & Hazardous Locations: 2nd ed. 2007 Int. Ass. of electrical inspectors, PP 23

Pyrophoric materials are what? and are used in what classified locations? JATC Hazardous Locations WB 7

Which of the following are Class II location material groups? Group E, F, or G? Hazardous Locations WB 8

The division system of hazardous area classification divides Class 1 locations into how many material groups? JATC Hazardous Locations WB 8

The Zone system of hazardous area classification divides class I materials into how many groups? JATC Hazardous Locations, WB 8

MESG is an acronym used in hazardous classified areas meaning what? Hazardous Locations: 2nd ed. 2007 Int. Ass. of electrical inspectors,WB 8

What wiring method(s) are allowed in a class I zone 0 classified location? NJATC Hazardous Locations WB 8

What is the color coding for intrinsically safe circuits? NEC 504.80C

What material groups are provided for class 3 locations? Hazardous Locations: 2nd ed. 2007 Int. Ass. of electrical inspectors, WB 9

The flash point of a liquid involves what form? Hazardous Locations: 2nd ed. 2007 Int. Ass. of electrical inspectors,WB 10

Sealed systems, such as metal gas piping systems are generally considered to be ________ locations. Hazardous Locations: 2nd ed. 2007 Int. Ass. of electrical inspectors, WB 10

Combustible dust is finely divided solid material __________ microns or less in diameter. Hazardous Locations: 2nd ed. 2007 Int. Ass. of electrical inspectors, PP16

Is risk analysis and determining if a location is hazardous a job done in the field? Hazardous Locations: 2nd ed. 2007 Int. Ass. of electrical inspectors, PP 18

Adequate ventilation is a condition where _________? Hazardous Locations: 2nd ed. 2007 Int. Ass. of electrical inspectors, PP 21

Some Halogenated liquid hydrocarbons with a flammable range but no flash point are considered what? Hazardous Locations: 2nd ed. 2007 Int. Ass. of electrical inspectors, PP 22

Two key considerations for design of a ventilated area to create an unclassified location are what? Hazardous Locations: 2nd ed. 2007 Int. Ass. of electrical inspectors, PP 22

A commercial repair facility is unclassified when there are more than _________ air changes per hour. Hazardous Locations: 2nd ed. 2007 Int. Ass. of electrical inspectors, PP 22

Housekeeping in every situation should be provided as a supplement to dust source elimination and ventilation. True or False? Hazardous Locations: 2nd ed. 2007 Int. Ass. of electrical inspectors, PP 22
True False

Explosion proof and dust-ignition proof enclosures are able or not able to contain explosions that occur inside? Hazardous Locations: 2nd ed. 2007 Int. Ass. of electrical inspectors, PP 23

The primary wiring method for hazardous locations under the Division System continues to be _____, While the primary wiring method used in the Zone system is ____. Hazardous Locations: 2nd ed. 2007 Int. Ass. of electrical inspectors, WB PP 19

Equipment marking shall specify the class, but division if the equipment is suitable for _________only. NEC 500.8(c)1 &2

As Heavier than air gases are heated, they behave how? Hazardous Locations: 2nd ed. 2007 Int. Ass. of electrical inspectors, PP 23

What is required at the vertical and horizontal boundaries of the classified locations? Hazardous Locations: 2nd ed. 2007 Int. Ass. of electrical inspectors, PP 19 figure 1-03 Note 3

Both the Division and Zone systems can be used in the same facility as long as what? Hazardous Locations: 2nd ed. 2007 Int. Ass. of electrical inspectors, PP 25

In what areas, the abnormal condition, or first fault, would have to occur in the containment system for the flammable or combustible material before an ignitible concentration could occur? Hazardous Locations: 2nd ed. 2007 Int. Ass. of electrical inspectors, PP 37

In addition to being wrench tight, the number of threads required to be engaged into explosion proof equipment entries is ______, whereas threaded joints must be_____. 2011 NEC 505.9E1 exc. 1

What is the maximum spacing for labeling of intrinsically safe wiring raceways, cable trays, and other wiring methods? NEC 504.80B

A combustible gas detection system is a protection technique that is limited to what? JATC Hazardous locations WB PP 23

Define the word approved as described in article 100 of the 2011 NEC.

Usually the AHJ will base approvals on the use of? Hazardous Locations: 2nd ed. 2007 Int. Ass. of electrical inspectors, PP 73

A nonincendive circuit does not include what type of wiring? NEC 500.1

The symbol AEx in Zone equipment marking refers to what? Hazardous Locations: 2nd ed. 2007 Int. Ass. of electrical inspectors, PP 79

If equipment under the zone system is identified with E, what protection technique is incorporated in the equipment? JATC Hazardous Locations, Hazardous Locations: 2nd ed. 2007 Int. Ass. of electrical inspectors, WB PP 33

Conduit seals are required to be listed and installed in what locations? Hazardous Locations: 2nd ed. 2007 Int. Ass. of electrical inspectors, WB PP 41 & 2011 NEC 501&2.15C1 fittings

What class hazardous location does not address seals

Conduit seals shall be installed within _____ of the enclosure. NEC 501.15A1

Metal conduit that contains no unions, couplings, boxes, or fittings, and passes completely through a class 1, Div 1 location with no fittings less than _____ beyond each boundary, shall not require a conduit seal if the termination points of the unbroken conduit are in _______. NEC 501.15A4

Examples of fittings employing other than NPT threads include? 2011 NEC 505.16B1 informational note

Type of protection where electrical parts capable of igniting an explosive atmosphere are fixed in position and completely surrounded by filling material such as ______ to prevent the ignition of an external explosive atmosphere is what? 2011 NEC 505.2 definitions

Combustible metallic dusts are covered by article 506 of the 2011 NEC Zone 20, 21, and 22 locations for combustible dusts or ignitible fivers/ flyings?

In conduit seals the conductor fill is not permitted to exceed _____ percent of the cross sectional area of the conduit unless specifically listed for a higher percentage. 2011 NEC 501.15C6