Journeyman Electrician’s Exam Journeyman Electrician's Special Occupancies 3 — Questions and Answers
Question 1: In a theater, which NEC article governs the electrical installations for the stage area?
- Article 518
- Article 520 (Correct answer)
- Article 522
- Article 525
Correct answer: Article 520
NEC Article 520 covers electrical installations in theaters, audience areas of motion picture studios, and similar locations.
Question 2: What type of grounding is required for patient care areas in a hospital to minimize electrical shock hazards?
- Standard equipment grounding only
- Isolated grounding
- Equipotential grounding (Correct answer)
- Double insulation
Correct answer: Equipotential grounding
NEC 517.13 requires equipotential grounding in patient care areas to reduce voltage differences between conductive surfaces that could cause microshock.
Question 3: A spray booth used for applying flammable finishes falls under which NEC article?
- Article 500
- Article 511
- Article 516 (Correct answer)
- Article 517
Correct answer: Article 516
NEC Article 516 covers spray application, dipping, and coating processes involving flammable or combustible liquids or powders.
Question 4: In a Class III hazardous location, what is the primary hazard?
- Flammable gases
- Combustible dusts
- Easily ignitable fibers or flyings (Correct answer)
- Explosive vapors
Correct answer: Easily ignitable fibers or flyings
Class III locations are those that are hazardous due to the presence of easily ignitable fibers or flyings, such as cotton, rayon, or hemp.
Question 5: Flexible cord used with portable equipment in a hazardous Class I, Division 2 location must be:
- Any listed flexible cord
- Extra-hard-usage cord with grounding conductor (Correct answer)
- Standard extension cord
- Reinforced cord only
Correct answer: Extra-hard-usage cord with grounding conductor
NEC 501.140 requires extra-hard-usage flexible cord with a grounding conductor for portable equipment in Class I hazardous locations.
Question 6: In an agricultural building with a livestock area, what additional requirement applies to all 125V receptacles?
- AFCI protection
- GFCI protection (Correct answer)
- Isolated ground receptacles
- Locking-type receptacles
Correct answer: GFCI protection
NEC 547.5 requires GFCI protection for all 125V, 15A and 20A receptacles in agricultural buildings with livestock, as animals are more vulnerable to electric shock.
Question 7: Which of the following best describes a 'critical branch' in a hospital essential electrical system?
- Supplies power to life support equipment only
- Supplies task illumination and selected receptacles in patient care areas (Correct answer)
- Supplies only the fire alarm system
- Supplies heating and air conditioning exclusively
Correct answer: Supplies task illumination and selected receptacles in patient care areas
Per NEC 517.33, the critical branch of the essential electrical system supplies task illumination, selected receptacles, and equipment in patient care areas.
Journeyman Electrician’s Exam Journeyman Electrician's Special Occupancies 3
In a theater, which NEC article governs the electrical installations for the stage area?