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.
