Exam 15: Hazardous Classified Locations

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

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

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

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

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.

Garages used for parking or storage are ____.

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

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 ____.

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.

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

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 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.

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

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.

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

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.

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

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

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

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