CME Special Occupancies and Equipment 3 — Questions and Answers
Question 1: NEC 680.8 specifies the minimum clearance for overhead service conductors above the water surface of a swimming pool as:
- 10 feet
- 14.5 feet
- 22.5 feet (Correct answer)
- 25 feet
Correct answer: 22.5 feet
NEC 680.8(A) requires a minimum 22.5-foot vertical clearance for overhead service conductors above a pool's water surface to prevent contact hazards.
Question 2: NEC 680.26 requires equipotential bonding for all metal parts within what distance of the inside walls of a swimming pool?
- 3 feet
- 5 feet (Correct answer)
- 10 feet
- 15 feet
Correct answer: 5 feet
NEC 680.26(B) requires all metal parts within 5 feet of the inside walls of a pool to be bonded together to eliminate dangerous voltage differences.
Question 3: Under NEC Article 547, receptacles in agricultural buildings that are subject to moisture must have:
- Twist-lock configuration
- GFCI protection (Correct answer)
- Explosionproof covers
- A minimum 20-amp rating
Correct answer: GFCI protection
NEC 547.5(G) requires GFCI protection for receptacles in areas of agricultural buildings exposed to moisture to protect against electric shock.
Question 4: Per NEC 550.32(C), the minimum ampere rating for the electrical service or feeder to a mobile home is:
- 60 amperes
- 100 amperes (Correct answer)
- 125 amperes
- 200 amperes
Correct answer: 100 amperes
NEC 550.32(C) mandates a minimum 100-ampere, 120/240-volt service or feeder for mobile homes to accommodate their electrical loads.
Question 5: For floating buildings under NEC Article 553, where must the disconnecting means for the feeder or service be located?
- On the utility pole
- On the floating building, at the point conductors enter (Correct answer)
- At the main shore panel only
- Within 50 feet of the water's edge
Correct answer: On the floating building, at the point conductors enter
NEC 553.4 requires the disconnecting means to be located on the floating building at or near the point where the conductors enter, ensuring accessible isolation.
Question 6: NEC 525.20 requires flexible cords and cables used for electrical equipment at carnivals and circuses to be rated for:
- Hard usage (Type SO)
- Extra-hard usage (Type SOOW or equivalent) (Correct answer)
- Portable use only (Type SPT)
- Indoor use only (Type SJO)
Correct answer: Extra-hard usage (Type SOOW or equivalent)
NEC 525.20(A) requires carnival and circus flexible cords to be listed for extra-hard usage due to the physical abuse they are subjected to in outdoor traveling environments.
Question 7: Under NEC Article 545, a manufactured building's electrical installation must be inspected:
- At the manufacturing facility only
- At the installation site only
- At both the manufacturing facility and the installation site (Correct answer)
- By a third-party NRTL laboratory only
Correct answer: At both the manufacturing facility and the installation site
NEC 545.3 requires inspection at the manufacturing facility for factory-installed wiring and at the installation site for completed connections and site wiring.
CME Special Occupancies and Equipment 3
NEC 680.8 specifies the minimum clearance for overhead service conductors above the water surface of a swimming pool as: