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1. Which of the following covers intrinsically safe equipment?

NEC Article 504

NEC Article 503

NEC Article 502

NEC Article 501

Question 1 of 15

2. Which of the following is approved for use in most Class I, Division 1 locations?

EMT

PVC

Liquid-tight conduit

Rigid metal conduit

Question 2 of 15

3. The main purpose of seals or sealoffs in conduit runs is to ________.

insulate the wires

isolate different voltages from each other

prevent the passage of gases, vapors, or flames from one portion of the system to another

prevent moisture from entering the raceway system

Question 3 of 15

4. In hazardous locations where threaded metal conduit is required, threaded joints must be made up with at least how many threads fully engaged?

Three

Four

Five

Two

Question 4 of 15

5. Locations in which flammable gases or vapors may be present in the air in quantities sufficient to produce explosive or ignitable mixtures are identified as ________.

Class I locations

Class III locations

Class II locations

Class IV locations

Question 5 of 15

6. Equipment that is incapable of releasing sufficient electrical energy to cause ignition of a hazardous atmospheric mixture is considered ________.

explosionproof

intrinsically safe

Class I, Group D

Class II, Group G

Question 6 of 15

7. Which of the following best describes the devices that will help prevent moisture from collecting in raceway systems?

Strainers

Elbows

Sealoff fittings

Integral drains

Question 7 of 15

8. Anesthetizing locations of hospitals are considered to be Class I, Division 1 locations to a height of ________.

3' above the floor

5' above the floor

2' above the floor

4' above the floor

Question 8 of 15

9. The main purpose of an explosionproof flexible coupling is to connect ________.

raceways with conductors that have varying voltages

motors to a raceway system

pushbutton control stations

pull boxes to a raceway system

Question 9 of 15

10. The space in the immediate vicinity inside of the motor dispensing unit at an automotive service station is identified as a ________.

Class I, Division 1 location

Class I, Division 2 location

Class III, Division 1 location

Class II, Division 1 location

Question 10 of 15

11. The requirements of electrical equipment and wiring for all voltages in locations where fire or explosion hazards may exist are covered in ________.

NEC Article 514

NEC Articles 525 and 530

NEC Articles 500 through 504

NEC Article 511

Question 11 of 15

12. Which of the following locations are hazardous due to the presence of combustible dust?

Class IV locations

Class II locations

Class I locations

Class III locations

Question 12 of 15

13. What is the classification and division of all floor-level areas up to a height of 18" in an airport hangar?

Class II, Division 2

Class II, Division 1

Class I, Division 2

Class I, Division 1

Question 13 of 15

14. A Class I, Division 1 location is best described as an atmosphere that ________.

is normally hazardous

is never hazardous

is not normally hazardous

could become hazardous

Question 14 of 15

15. In general, when are seals typically installed?

At the same time as the conduit system

Before the conduit system is installed

After the conductors have been installed

After the conduit system is installed

Question 15 of 15

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