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CONTENT
270 QUESTIONS AND ANSWERS
1. What is the main purpose of the National Electrical Code (NEC)?
A. To ensure the safety of electrical installations.
B. To promote electrical energy efficiency.
C. To reduce installation costs.
D. To set electrical utility rates.
Answer: A. To ensure the safety of electrical installations.
Explanation: The NEC is primarily designed to ensure the safe installation of
electrical wiring and equipment in buildings.
2. Which of the following is NOT a type of conductor covered by the NEC?
A. Copper wire
B. Aluminum wire
C. Steel wire
D. Fiber-optic cable
Answer: D. Fiber-optic cable
Explanation: The NEC typically covers electrical conductors, such as copper,
aluminum, and steel wire, but it does not generally apply to fiber-optic cables.
3. What is the minimum height for overhead conductors above residential
yards?
,A. 12 feet
B. 14 feet
C. 18 feet
D. 20 feet
Answer: B. 14 feet
Explanation: According to NEC Article 230.24, overhead conductors must be
at least 14 feet above residential yards.
4. What does NEC stand for?
A. National Environmental Code
B. National Electrical Code
C. New Electrical Code
D. National Electrical Commission
Answer: B. National Electrical Code
Explanation: The NEC is a set of standards for electrical installations in
buildings, aiming to ensure safety and prevent electrical hazards.
5. What is the maximum allowable number of circuits in a box according to
the NEC?
A. 6 circuits
B. 8 circuits
C. 10 circuits
D. The number is based on the size of the box.
Answer: D. The number is based on the size of the box.
Explanation: The maximum number of circuits that can be in a box depends on
the box's volume and the size of the conductors.
6. What is the purpose of a grounding electrode system (GES)?
A. To improve electrical system efficiency.
B. To create a return path to the earth for fault currents.
C. To enhance the power distribution system.
D. To protect transformers from overcurrent.
,Answer: B. To create a return path to the earth for fault currents.
Explanation: A grounding electrode system provides a safe path for electrical
currents to return to the earth in the event of a fault.
7. Which of the following materials is acceptable for use as grounding
electrode conductors?
A. Copper
B. Brass
C. Steel
D. Aluminum alloy
Answer: A. Copper
Explanation: Copper is commonly used for grounding electrode conductors
because of its excellent conductivity and corrosion resistance.
8. What is the minimum grounding conductor size for a 100-amp
residential service?
A. 6 AWG copper or 4 AWG aluminum
B. 8 AWG copper or 6 AWG aluminum
C. 10 AWG copper or 8 AWG aluminum
D. 12 AWG copper or 10 AWG aluminum
Answer: A. 6 AWG copper or 4 AWG aluminum
Explanation: According to NEC 250.122, the minimum size of a grounding
conductor for a 100-amp service is 6 AWG copper or 4 AWG aluminum.
9. Which of the following is the proper method of grounding a metal water
pipe that serves as a grounding electrode?
A. Bond the water pipe to the electrical panel.
B. Use a plastic conduit between the panel and the pipe.
C. Install a bonding jumper to the water pipe.
D. Ground the water pipe directly to the ground.
, Answer: C. Install a bonding jumper to the water pipe.
Explanation: A bonding jumper is required to electrically bond a metal water
pipe to the grounding system to ensure continuity.
10. Which type of wiring method is typically used for branch circuits in a
building?
A. Rigid metal conduit
B. Nonmetallic sheathed cable
C. Underground feeder cable
D. Bus ducts
Answer: B. Nonmetallic sheathed cable
Explanation: Nonmetallic sheathed cable (commonly referred to as Romex) is
commonly used for branch circuits in residential buildings.
11. What is the maximum number of 12 AWG conductors allowed in a 4"
square metal box that is 1-1/2" deep?
A. 6
B. 8
C. 9
D. 10
Answer: C. 9
Explanation: Using box fill calculations from NEC Table 314.16(A), a 4" x 1-
1/2" box has 21 cubic inches. Each 12 AWG wire requires 2.25 cu in, so 21 ÷
2.25 = 9 wires.
12. What NEC article covers branch circuits?
A. 210
B. 220
C. 240
D. 250
Answer: A. 210
Explanation: NEC Article 210 covers requirements for branch circuits
including ratings, receptacle placement, and overcurrent protection.
BANK WITH VERIFIED ANSWERS – PASS
GUARANTEE WITH THE MOST UPDATED EXAM
CONTENT
270 QUESTIONS AND ANSWERS
1. What is the main purpose of the National Electrical Code (NEC)?
A. To ensure the safety of electrical installations.
B. To promote electrical energy efficiency.
C. To reduce installation costs.
D. To set electrical utility rates.
Answer: A. To ensure the safety of electrical installations.
Explanation: The NEC is primarily designed to ensure the safe installation of
electrical wiring and equipment in buildings.
2. Which of the following is NOT a type of conductor covered by the NEC?
A. Copper wire
B. Aluminum wire
C. Steel wire
D. Fiber-optic cable
Answer: D. Fiber-optic cable
Explanation: The NEC typically covers electrical conductors, such as copper,
aluminum, and steel wire, but it does not generally apply to fiber-optic cables.
3. What is the minimum height for overhead conductors above residential
yards?
,A. 12 feet
B. 14 feet
C. 18 feet
D. 20 feet
Answer: B. 14 feet
Explanation: According to NEC Article 230.24, overhead conductors must be
at least 14 feet above residential yards.
4. What does NEC stand for?
A. National Environmental Code
B. National Electrical Code
C. New Electrical Code
D. National Electrical Commission
Answer: B. National Electrical Code
Explanation: The NEC is a set of standards for electrical installations in
buildings, aiming to ensure safety and prevent electrical hazards.
5. What is the maximum allowable number of circuits in a box according to
the NEC?
A. 6 circuits
B. 8 circuits
C. 10 circuits
D. The number is based on the size of the box.
Answer: D. The number is based on the size of the box.
Explanation: The maximum number of circuits that can be in a box depends on
the box's volume and the size of the conductors.
6. What is the purpose of a grounding electrode system (GES)?
A. To improve electrical system efficiency.
B. To create a return path to the earth for fault currents.
C. To enhance the power distribution system.
D. To protect transformers from overcurrent.
,Answer: B. To create a return path to the earth for fault currents.
Explanation: A grounding electrode system provides a safe path for electrical
currents to return to the earth in the event of a fault.
7. Which of the following materials is acceptable for use as grounding
electrode conductors?
A. Copper
B. Brass
C. Steel
D. Aluminum alloy
Answer: A. Copper
Explanation: Copper is commonly used for grounding electrode conductors
because of its excellent conductivity and corrosion resistance.
8. What is the minimum grounding conductor size for a 100-amp
residential service?
A. 6 AWG copper or 4 AWG aluminum
B. 8 AWG copper or 6 AWG aluminum
C. 10 AWG copper or 8 AWG aluminum
D. 12 AWG copper or 10 AWG aluminum
Answer: A. 6 AWG copper or 4 AWG aluminum
Explanation: According to NEC 250.122, the minimum size of a grounding
conductor for a 100-amp service is 6 AWG copper or 4 AWG aluminum.
9. Which of the following is the proper method of grounding a metal water
pipe that serves as a grounding electrode?
A. Bond the water pipe to the electrical panel.
B. Use a plastic conduit between the panel and the pipe.
C. Install a bonding jumper to the water pipe.
D. Ground the water pipe directly to the ground.
, Answer: C. Install a bonding jumper to the water pipe.
Explanation: A bonding jumper is required to electrically bond a metal water
pipe to the grounding system to ensure continuity.
10. Which type of wiring method is typically used for branch circuits in a
building?
A. Rigid metal conduit
B. Nonmetallic sheathed cable
C. Underground feeder cable
D. Bus ducts
Answer: B. Nonmetallic sheathed cable
Explanation: Nonmetallic sheathed cable (commonly referred to as Romex) is
commonly used for branch circuits in residential buildings.
11. What is the maximum number of 12 AWG conductors allowed in a 4"
square metal box that is 1-1/2" deep?
A. 6
B. 8
C. 9
D. 10
Answer: C. 9
Explanation: Using box fill calculations from NEC Table 314.16(A), a 4" x 1-
1/2" box has 21 cubic inches. Each 12 AWG wire requires 2.25 cu in, so 21 ÷
2.25 = 9 wires.
12. What NEC article covers branch circuits?
A. 210
B. 220
C. 240
D. 250
Answer: A. 210
Explanation: NEC Article 210 covers requirements for branch circuits
including ratings, receptacle placement, and overcurrent protection.
