Article 500 - Hazardous (Classified) Locations

the article 500 section of the chapter 5 test

All areas designated as hazardous (classified) locations shall be properly _____ and shall be available to those authorized to design, install, inspect, maintain, or operate electrical equipment at these locations.

(B) documented

Hazardous (classified) locations shall be classified depending on the properties of the _____ that could be present, and the likelihood that flammable or combustible concentration or quantity is present.

(D) all of these

It is frequently possible to locate much of the equipment in less hazardous or unclassified locations and thus reduce the amount of special equipment required.

(A) True

Class I, Division 1 locations are those in which ignitable concentrations of _____ can exist under normal operating conditions.

(C) flammable gases or flammable liquid-produced vapors

An area that is adjacent to a Class I, Division 1 location, and to which ignitable concentrations of flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors above their flash points might occasionally be communicated is a _____ locations.

(C) Class I, Division 2

When determining a Class I, Division 2 location, the _____ is a factor that should be considered in determining the classification and extent of the location.

(D) all of these

Class II locations are those that are hazardous because of the presence of _____.

(A) combustible dust

Locations in which combustible dust is in the air under normal operating conditions in quantities sufficient to produce explosive or ignitable mixtures are classified as _____.

(B) Class II, Division 1

A Class II, Division 2 location is a location _____.

(D) all of these

Class III locations are those that are hazardous because of the presence of _____.

(B) easily ignitable fibers or materials producing combustible flyings

Class III, Division _____ locations include areas where easily ignitable fibers/flyings are handled, manufactured, or used.

(A) 1

A Class III, Division _____ location is where easily ignitable fibers/flyings are stored or handled but not manufactured.

(B) 2

Electrical and electronic equipment in hazardous (classified) locations shall be protected by a(an) _____ technique.

(D) any of these

Dust-tight protection techniques shall be permitted for equipment in Class I, Division 2 locations.

(B) False

Suitability of identified equipment for use in a hazardous (classified) location shall be determined by _____.

(D) any of these

Equipment shall be identified not only for the class of hazardous (classified) location, but also for the explosive, combustible, or ignitable properties of the specific _____ present.

(D) any of these

Threaded conduits or fittings installed in hazardous (classified) locations shall be made wrench-tight to _____.

(A) prevent sparking when fault current flows through the conduit system