Journeyman Electrician’s Exam Journeyman Electrician's Special Occupancies 2 — Questions and Answers
Question 1: In a Class I, Division 1 location, which wiring method is NOT permitted?
- Threaded rigid metal conduit
- Type MI cable
- Explosion-proof flexible fittings
- Type NM cable (Correct answer)
Correct answer: Type NM cable
Type NM (nonmetallic sheathed) cable is not permitted in Class I hazardous locations; only approved methods like RMC or MI cable are allowed.
Question 2: What is the minimum distance that open wiring must be kept from the surface of grain storage bins per NEC Article 511?
- 6 inches
- 12 inches (Correct answer)
- 18 inches
- 24 inches
Correct answer: 12 inches
NEC Article 511 and related agricultural occupancy rules require open wiring to be kept at least 12 inches from grain bin surfaces to prevent fire hazards.
Question 3: In a gasoline dispensing station, the area within 18 inches horizontally from a dispenser enclosure is classified as:
- Class I, Division 2 (Correct answer)
- Class I, Division 1
- Unclassified
- Class II, Division 1
Correct answer: Class I, Division 2
Per NEC Article 514, the area within 18 inches horizontally and 4 inches vertically from a dispenser enclosure is classified Class I, Division 2.
Question 4: Which NEC article covers electrical installations in health care facilities?
- Article 500
- Article 517 (Correct answer)
- Article 518
- Article 520
Correct answer: Article 517
NEC Article 517 specifically governs electrical wiring and equipment in health care facilities including hospitals and nursing homes.
Question 5: In a commercial garage, the floor area up to what height above the floor is classified as Class I, Division 2?
- 6 inches
- 12 inches
- 18 inches (Correct answer)
- 24 inches
Correct answer: 18 inches
Per NEC 511.3, the area up to 18 inches above the floor in a commercial garage is classified Class I, Division 2 due to heavier-than-air gasoline vapors.
Question 6: An essential electrical system in a hospital must restore power within how many seconds after a utility outage?
- 5 seconds
- 10 seconds (Correct answer)
- 15 seconds
- 30 seconds
Correct answer: 10 seconds
NEC 517.31 requires the essential electrical system's life safety branch to restore power within 10 seconds of a normal power interruption.
Question 7: In a Class II, Division 1 location, dust-ignitionproof equipment is required. Which type of dust classifies a location as Class II?
- Flammable vapors
- Combustible fibers
- Combustible dust (Correct answer)
- Explosive gases
Correct answer: Combustible dust
Class II locations are defined by the presence of combustible dust, such as grain dust, coal dust, or metal dust, in quantities sufficient to produce an ignitable mixture.
Journeyman Electrician’s Exam Journeyman Electrician's Special Occupancies 2
In a Class I, Division 1 location, which wiring method is NOT permitted?