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Exam 15: Hazardous Classified Locations

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Question 1

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

A) adequacy of dust removal systems
B) potential for arcing
C) chemical composition of the dust
D) proximity of sprinkler systems

E) None of the above
F) A) and B)

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Question 2

Multiple Choice

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Class II locations are hazardous because of the presence of ____.

A) combustible vapors
B) potential arcing
C) volatile mixtures
D) combustible dust

E) A) and B)
F) All of the above

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Question 3

Multiple Choice

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All cut ends of intermediate metal conduit (IMC) and rigid metal conduit (RMC) shall be ____.

Class III locations are hazardous because of the presence of ____, or where materials producing combustible flyings are handled, manufactured, or used, even though they are not likely to be airborne in quantities sufficient to produce ignitable mixtures.

Equipment markings shall include: (1) class, (2) division, (3) material classification group, (4) equipment temperature, and (5) ____.

Garages used for parking or storage are ____.

____ locations contain ignitable or combustible elements (gases, dust, fibers, etc.) in quantities sufficient to produce explosive (or ignitable) mixtures.

Group G is the catchall group whose atmospheres contain combustible dusts not included in Group E or F, including ____.

Tensile stress at Type MI cable termination fittings can be avoided by ____.

The space adjacent to an enclosed dipping (or coating) process/apparatus is ____.

Class II, Division 1 locations require interlocked armor Type MC cable having an overall jacket of suitable polymeric material and provided with termination fittings and ____.

Flammable/combustible gases (or liquid-produced vapor) are categorized by considering ____ and minimum igniting current ratio (MIC ratio) values.

Article 515 covers a property or portion of a property where ____ are received by tank vessel, pipelines, tank car, or tank vehicle and are stored or blended in bulk for the purpose of distribution.

The temperature marking for organic dusts that may dehydrate or carbonize, the temperature marking shall not exceed the lower of either the ignition temperature or ____.

The simultaneous presence of flammable gases, flammable liquid-produced vapors, combustible liquid-produced vapors, or combustible dusts shall be considered when determining the ____ of the electrical equipment.

Equipment protection techniques may include explosionproof junction boxes, dusttight enclosures, heremetic sealing and ____.

Areas in a garage adjacent to classified locations in which flammable vapor release is unlikely (such as a storeroom) shall be unclassified where ____.

Hazardous (classified) locations are divided into certain categories and subcategories, otherwise known as ____.

Conduit/cable system seals minimize the passage of ____ and prevent the passage of flames from one portion of the electrical installation to another through the conduit.

Askarel-containing transformers, rated in excess of 25 kVA, shall have ____.