CEA NEC Wiring and Protection 2 — Questions and Answers
Question 1: According to NEC Article 210, what is the minimum number of 20-ampere small-appliance branch circuits required in a kitchen?
- One 20A circuit
- Two 20A circuits (Correct answer)
- Three 20A circuits
- One 15A circuit is sufficient
Correct answer: Two 20A circuits
NEC 210.11(C)(1) requires at least two 20-ampere small-appliance branch circuits to serve kitchen receptacle outlets.
Question 2: What is the maximum length of a free conductor left at each outlet box per NEC 300.14?
- 4 inches
- 6 inches (Correct answer)
- 8 inches
- 12 inches
Correct answer: 6 inches
NEC 300.14 requires at least 6 inches of free conductor at each outlet, junction, or switch point.
Question 3: Which NEC article governs the use of electrical metallic tubing (EMT)?
- Article 342
- Article 344
- Article 358 (Correct answer)
- Article 362
Correct answer: Article 358
NEC Article 358 covers Electrical Metallic Tubing (EMT), including its uses, installation, and fittings.
Question 4: Per NEC 210.52, receptacle outlets in a dwelling are required so that no point along the floor line is more than how far from a receptacle?
- 4 feet
- 6 feet (Correct answer)
- 8 feet
- 12 feet
Correct answer: 6 feet
NEC 210.52(A) states that receptacles must be placed so no point along the floor line in any wall space is more than 6 feet from a receptacle.
Question 5: What does NEC Article 250 primarily cover?
- Branch circuits and feeders
- Grounding and bonding (Correct answer)
- Wiring methods in ducts
- Overcurrent protection
Correct answer: Grounding and bonding
NEC Article 250 covers all grounding and bonding requirements, including system grounding and equipment grounding.
Question 6: Under NEC 310.15, what is the ampacity of a 12 AWG copper conductor with 60°C insulation in a conduit with no more than 3 current-carrying conductors?
- 15 amperes
- 20 amperes (Correct answer)
- 25 amperes
- 30 amperes
Correct answer: 20 amperes
Per NEC Table 310.16, a 12 AWG copper conductor with 60°C insulation has an ampacity of 20 amperes.
Question 7: According to NEC 230.70, the service disconnecting means must be installed at a readily accessible location nearest to the point of entrance of service conductors and must be:
- Inside a locked electrical room only
- Outside or inside nearest the point of entry (Correct answer)
- At least 10 feet from the meter
- Located only in the basement
Correct answer: Outside or inside nearest the point of entry
NEC 230.70(A)(1) requires the service disconnect to be located either outside or inside the building nearest to the point where the service conductors enter.
CEA NEC Wiring and Protection 2
According to NEC Article 210, what is the minimum number of 20-ampere small-appliance branch circuits required in a kitchen?