Journeyman Electrician’s Exam Journeyman Electrician's Special Occupancies 5 — Questions and Answers
Question 1: In a health care facility, which of the following is connected to the 'life safety branch' of the essential electrical system?
- Nurse call systems
- Task illumination in operating rooms
- Exit signs and egress lighting (Correct answer)
- X-ray equipment
Correct answer: Exit signs and egress lighting
NEC 517.32 specifies that the life safety branch supplies exit signs, means of egress lighting, fire alarms, and similar life-safety systems.
Question 2: When installing wiring in a Class I, Division 1 area, which seal requirement applies to conduit entering explosion-proof enclosures?
- Seals are only required on vertical conduit runs
- A sealing fitting must be installed within 18 inches of the enclosure (Correct answer)
- No sealing is required if the conduit is 1/2 inch trade size
- Seals are only required on conduits larger than 2 inches
Correct answer: A sealing fitting must be installed within 18 inches of the enclosure
NEC 501.15(A) requires conduit seals to be installed within 18 inches of explosion-proof enclosures in Class I, Division 1 locations to prevent passage of flames or gases.
Question 3: What is the required GFCI protection for 125V receptacles installed outdoors at a temporary power distribution system for a construction site?
- GFCI is optional at construction sites
- GFCI is only required for wet locations
- All 125V, 15A and 20A receptacles must have GFCI protection (Correct answer)
- GFCI required only for tools rated under 15A
Correct answer: All 125V, 15A and 20A receptacles must have GFCI protection
NEC 590.6 requires GFCI protection for all 125V, 15A and 20A receptacles at construction sites regardless of location type.
Question 4: In a recreational vehicle park, each RV site with electrical supply must have at minimum which receptacle configuration?
- Only a 15A, 125V receptacle
- A 20A, 125V receptacle only
- A 30A, 125V receptacle only
- Both 20A, 125V and 30A, 125V receptacles (Correct answer)
Correct answer: Both 20A, 125V and 30A, 125V receptacles
NEC 551.71 requires that each RV site with electrical supply be equipped with at least a 20A, 125V receptacle and a 30A, 125V receptacle.
Question 5: In an aircraft hangar, the area within 5 feet horizontally from aircraft fuel tanks is classified as:
- Unclassified
- Class I, Division 2
- Class I, Division 1 (Correct answer)
- Class II, Division 2
Correct answer: Class I, Division 1
NEC 513.3(A) classifies the area within 5 feet horizontally from aircraft fuel tanks as Class I, Division 1 due to the continuous presence of ignitable vapors.
Question 6: What NEC article applies to electrical systems installed in floating buildings?
- Article 550
- Article 551
- Article 553 (Correct answer)
- Article 555
Correct answer: Article 553
NEC Article 553 specifically covers electrical wiring and equipment in floating buildings, which are permanent structures on water.
Question 7: In a Class II, Division 2 location where combustible dust may accumulate, luminaires must be designed to prevent surface temperatures from exceeding what percentage of the dust's ignition temperature?
- 80% (Correct answer)
- 75%
- 66%
- 50%
Correct answer: 80%
Equipment in Class II locations must not have surface temperatures exceeding 80% of the ignition temperature of the specific combustible dust to prevent ignition.
