CEI CEI Service Entrance & Metering Inspection 1 — Questions and Answers
Question 1: According to NEC 230.70, where must the service disconnecting means be located?
- Inside the main electrical panel only
- Outside the building or nearest the point of entrance of service conductors (Correct answer)
- Within 5 feet of the meter socket
- At any accessible location inside the building
Correct answer: Outside the building or nearest the point of entrance of service conductors
NEC 230.70(A)(1) requires the service disconnecting means to be installed at a readily accessible location either outside the building or inside nearest the point of entrance.
Question 2: What is the maximum number of disconnects allowed for a service entrance under NEC 230.71?
- Two disconnects per service
- Four disconnects per service
- Six disconnects per service (Correct answer)
- Eight disconnects per service
Correct answer: Six disconnects per service
NEC 230.71(A) permits a maximum of six disconnects per service, with each disconnect serving a separate load.
Question 3: During a service entrance inspection, you observe service-entrance conductors routed through the interior of a building before reaching the service equipment. Per NEC 230.6, which condition would allow this?
- The conductors are installed in a raceway
- The conductors are encased in 2 inches of concrete (Correct answer)
- The conductors are protected by a steel sleeve
- The conductors are insulated with 600V-rated insulation
Correct answer: The conductors are encased in 2 inches of concrete
NEC 230.6 considers service conductors outside a building when encased in at least 2 inches of concrete beneath a building or structure.
Question 4: What is the minimum clearance required between service-drop conductors and a roof surface with a slope of less than 4 inches in 12 inches?
- 3 feet (Correct answer)
- 8 feet
- 18 inches
- 10 feet
Correct answer: 3 feet
NEC 230.24(A) requires service-drop conductors to maintain a minimum clearance of 3 feet from the roof surface for roofs with less than a 4-in-12 slope.
Question 5: When inspecting overhead service conductors, what is the minimum clearance required above a public sidewalk?
- 10 feet
- 12 feet (Correct answer)
- 15 feet
- 18 feet
Correct answer: 12 feet
NEC 230.24(B) requires service-drop conductors to maintain a minimum vertical clearance of 12 feet above a sidewalk accessible to pedestrians.
Question 6: Which NEC section addresses the requirement that service-entrance conductors must be protected against physical damage?
- NEC 230.50 (Correct answer)
- NEC 230.54
- NEC 230.70
- NEC 230.82
Correct answer: NEC 230.50
NEC 230.50 requires service-entrance conductors to be protected against physical damage, specifying acceptable wiring methods such as rigid conduit and intermediate metal conduit.
CEI CEI Service Entrance & Metering Inspection 1
According to NEC 230.70, where must the service disconnecting means be located?