PC Special Occupancies and Equipment 2 — Questions and Answers
Question 1: In a Class II, Division 1 hazardous location involving combustible dust, which wiring method is specifically permitted by NEC Article 502?
- EMT with listed fittings
- Rigid metal conduit (RMC) with dusttight fittings (Correct answer)
- Type NM cable
- Open wiring on insulators
Correct answer: Rigid metal conduit (RMC) with dusttight fittings
NEC 502.10 permits RMC with listed dusttight fittings in Class II, Division 1 locations to prevent ignition of combustible dust.
Question 2: Under NEC Article 517, a 'patient care vicinity' in a healthcare facility extends how far from a patient bed?
- 3 feet horizontally and 5 feet above the floor
- 6 feet horizontally and 7.5 feet above the floor (Correct answer)
- 4 feet horizontally and 6 feet above the floor
- 5 feet horizontally and 8 feet above the floor
Correct answer: 6 feet horizontally and 7.5 feet above the floor
NEC 517.2 defines the patient care vicinity as the space within 6 feet horizontally and 7.5 feet above the floor from the patient bed.
Question 3: What is the maximum allowable distance between receptacles in a marina or boatyard pedestal installation per NEC Article 553?
- The receptacle must be within 15 feet of each slip
- The receptacle must be within 30 feet of the boat connection point (Correct answer)
- No specific distance limit is specified in NEC 553
- Each slip must have its own dedicated receptacle within 50 feet
Correct answer: The receptacle must be within 30 feet of the boat connection point
NEC 553.4 requires shore power receptacles to be located within 30 feet of the connected vessel to minimize cord hazards.
Question 4: For a permanently installed swimming pool, NEC 680.22 requires that no receptacle outlet be installed within what minimum distance from the inside wall of the pool?
- 6 feet
- 10 feet
- 15 feet (Correct answer)
- 20 feet
Correct answer: 15 feet
NEC 680.22(A)(1) prohibits receptacle outlets within 6 feet of the inside walls of permanently installed pools, but no receptacle shall be within 10 feet unless GFCI protected, and 15 feet is the minimum for non-GFCI receptacles.
Question 5: In an agricultural building covered by NEC Article 547, which wiring method is NOT permitted due to moisture and corrosive atmosphere concerns?
- Type UF cable
- Rigid nonmetallic conduit (RNC)
- Type NM cable (Correct answer)
- Liquidtight flexible nonmetallic conduit
Correct answer: Type NM cable
NEC 547.5 prohibits Type NM cable in agricultural buildings because the moisture and corrosive atmosphere degrade its jacket and conductors.
Question 6: Per NEC Article 511, a major repair garage requires that electrical equipment in the area within 18 inches of the floor be listed for use in what classification?
- Class I, Division 2 (Correct answer)
- Class II, Division 1
- Class I, Division 1
- General-purpose only
Correct answer: Class I, Division 2
NEC 511.3 classifies the area up to 18 inches above the floor in major repair garages as Class I, Division 2 due to heavier-than-air flammable vapors.
Question 7: Under NEC Article 550, a mobile home feeder must be rated at minimum how many amperes?
- 60 amperes
- 80 amperes
- 100 amperes (Correct answer)
- 125 amperes
Correct answer: 100 amperes
NEC 550.10(A) requires that the mobile home service equipment and feeder be rated not less than 100 amperes.
PC Special Occupancies and Equipment 2
In a Class II, Division 1 hazardous location involving combustible dust, which wiring method is specifically permitted by NEC Article 502?