Licensed Electrical Contractor NEC General Requirements 2 — Questions and Answers
Question 1: According to NEC Article 110, what is the minimum headroom required for electrical equipment rated 1200A or more and over 6 feet wide in a dedicated electrical space?
- 5 feet
- 6 feet (Correct answer)
- 6.5 feet
- 8 feet
Correct answer: 6 feet
NEC 110.26(A)(3) requires a minimum headroom of 6 feet for equipment rated 1200A or more and over 6 feet wide.
Question 2: Under the NEC, which article governs the requirements for conductors entering enclosures to prevent abrasion?
- Article 100
- Article 110
- Article 300 (Correct answer)
- Article 312
Correct answer: Article 300
NEC Article 300 covers wiring methods and requires conductors to be protected from abrasion where they enter enclosures.
Question 3: What does NEC 110.14 primarily address?
- Conductor ampacity ratings
- Electrical connections and terminals (Correct answer)
- Grounding electrode requirements
- Circuit breaker interrupting ratings
Correct answer: Electrical connections and terminals
NEC 110.14 covers electrical connections, including the requirement that terminals be compatible with the conductors used.
Question 4: Per NEC 110.3(B), installed electrical equipment must be used:
- At any voltage the installer deems appropriate
- In accordance with its listing and labeling instructions (Correct answer)
- Only with copper conductors unless aluminum is specified
- With GFCI protection in all locations
Correct answer: In accordance with its listing and labeling instructions
NEC 110.3(B) requires that listed and labeled equipment be installed and used in accordance with the instructions included in the listing or labeling.
Question 5: Which NEC section requires that interrupting ratings of overcurrent devices be sufficient for the available fault current?
- 110.9 (Correct answer)
- 110.10
- 110.11
- 110.12
Correct answer: 110.9
NEC 110.9 requires that equipment intended to interrupt current at fault levels have an interrupting rating sufficient for the nominal circuit voltage and the current available.
Question 6: According to NEC 110.26(C)(2), what is required for electrical equipment rooms with a door that opens toward the working space?
- The door must be at least 36 inches wide
- The door must open to provide a minimum 90-degree swing
- The door must be equipped with panic hardware or a listed exit device (Correct answer)
- The door must have a minimum 7-foot height
Correct answer: The door must be equipped with panic hardware or a listed exit device
NEC 110.26(C)(2) requires that doors opening into a working space be equipped with panic hardware or listed exit devices for personnel doors.
Question 7: What NEC requirement applies to conductors of different systems occupying the same raceway?
- They must be the same wire gauge
- All conductors must have insulation rated for the highest voltage present (Correct answer)
- They must be color-coded with the same scheme
- Conductors over 600V and under 600V may never share a raceway
Correct answer: All conductors must have insulation rated for the highest voltage present
NEC 300.3(C)(1) requires that conductors of different systems in the same raceway all have insulation rated for the highest voltage present.
Licensed Electrical Contractor NEC General Requirements 2
According to NEC Article 110, what is the minimum headroom required for electrical equipment rated 1200A or more and over 6 feet wide in a dedicated electrical space?