Licensed Electrical Contractor NEC Code Requirements 1 — Questions and Answers
Question 1: According to NEC 110.26, the minimum depth of working space required in front of electrical equipment rated 600V or less (Condition 1) is:
- 18 inches
- 2 feet
- 3 feet (Correct answer)
- 4 feet
Correct answer: 3 feet
NEC 110.26(A)(1) Condition 1 mandates a minimum 3-foot depth of clear working space in front of equipment operating at 600V or less to allow safe access and maintenance.
Question 2: Under NEC Chapter 9, Table 1, the maximum allowable raceway fill for three or more conductors is:
- 25%
- 31%
- 40% (Correct answer)
- 53%
Correct answer: 40%
NEC Chapter 9, Table 1 limits raceway fill to 40% of the cross-sectional area when three or more conductors are installed, reducing heat buildup and allowing for conductor movement.
Question 3: The NEC requires that an equipment grounding conductor be identified by:
- White or gray insulation only
- Green insulation, green with yellow stripe, or bare conductor (Correct answer)
- Orange insulation to distinguish it from ungrounded conductors
- Any color except white, gray, or green
Correct answer: Green insulation, green with yellow stripe, or bare conductor
NEC 250.119 requires equipment grounding conductors to be identified by green insulation, green with one or more yellow stripes, or a bare (uninsulated) conductor so they are not confused with ungrounded or grounded conductors.
Question 4: According to NEC 210.8(A), GFCI protection is required for all 125-volt, 15- and 20-ampere receptacles that serve countertop surfaces in a dwelling unit:
- Living room
- Bedroom
- Kitchen (Correct answer)
- Dining room
Correct answer: Kitchen
NEC 210.8(A)(6) specifically requires GFCI protection for receptacles serving countertop surfaces in kitchens of dwelling units due to the proximity of water sources and increased shock risk.
Question 5: Per NEC 230.70(A)(1), the service disconnecting means for a one-family dwelling must be installed:
- Inside the dwelling in a dedicated electrical room
- At any location convenient to the homeowner
- At a readily accessible location either outside or inside the structure nearest the point of service entrance (Correct answer)
- At least 5 feet from any water source inside the home
Correct answer: At a readily accessible location either outside or inside the structure nearest the point of service entrance
NEC 230.70(A)(1) requires the service disconnect to be at a readily accessible location nearest the point where the service conductors enter the building, enabling first responders and utility workers to quickly de-energize the structure.
Question 6: Under NEC 240.4(D), the maximum overcurrent protection permitted for 12 AWG copper conductors is:
- 15 amperes
- 20 amperes (Correct answer)
- 25 amperes
- 30 amperes
Correct answer: 20 amperes
NEC 240.4(D) sets a hard limit of 20 amperes for 12 AWG copper conductors regardless of the conductor's rated ampacity at higher temperatures, protecting the wire from sustained overload conditions.
Licensed Electrical Contractor NEC Code Requirements 1
According to NEC 110.26, the minimum depth of working space required in front of electrical equipment rated 600V or less (Condition 1) is: