Nevada Electrical Inspector Certification
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. What is the maximum allowable voltage drop for a feeder circuit
under the National Electrical Code (NEC)?
A. 1%
B. 2%
C. 3%
D. 5%
The NEC recommends that voltage drop not exceed 3% for feeders to
ensure efficient operation and prevent excessive energy loss.
2. According to the NEC, what is the minimum burial depth for a
120/240V nonmetallic-sheathed cable (NM) in residential
applications?
A. 6 inches
B. 12 inches
C. 24 inches
D. 36 inches
NM cables must be buried at least 24 inches below grade when
installed underground to protect against physical damage.
3. Which of the following types of grounding electrodes is permitted by
the NEC?
A. Wood stakes
B. Plastic rods
C. Metal underground water pipe
D. Fiberglass rods
, Metal underground water pipes are conductive and acceptable as
grounding electrodes if they meet length and conductivity
requirements.
4. What is the primary purpose of an overcurrent protective device?
A. To reduce electricity bills
B. To measure energy consumption
C. To protect conductors and equipment from excessive current
D. To ground the electrical system
Overcurrent protective devices, such as fuses and circuit breakers,
prevent overheating and potential fires by interrupting excess
current.
5. In a three-phase, four-wire system, what is the relationship between
line voltage and phase voltage?
A. Line voltage = Phase voltage ÷ √3
B. Line voltage = Phase voltage × 2
C. Line voltage = Phase voltage ÷ 2
D. Line voltage = Phase voltage × √3
In a three-phase system, the line-to-line voltage is √3 times the phase
voltage, as defined by three-phase vector relationships.
6. Which conductor color is typically used for a grounded (neutral)
conductor in the U.S.?
A. Red
B. Black
C. White
D. Green
White is standardized in the NEC for neutral conductors to distinguish
them from hot and ground wires.
7. What is the minimum working space required in front of electrical
panels rated 600 volts or less?
A. 24 inches
B. 36 inches
C. 48 inches
D. 60 inches
The NEC requires 36 inches of clear working space to allow safe
operation and maintenance of electrical equipment.
, 8. Which type of conduit is permitted to be used in damp or wet
locations?
A. PVC schedule 40
B. RMC (Rigid Metal Conduit)
C. EMT (Electrical Metallic Tubing) without coating
D. NM cable
RMC is corrosion-resistant and suitable for wet or damp
environments, providing mechanical protection and moisture
resistance.
9. What is the NEC-required minimum size for a grounding electrode
conductor connecting to a 200-amp service?
A. 6 AWG copper
B. 4 AWG copper
C. 4 AWG aluminum
D. 8 AWG copper
A 200-amp service typically requires at least a 4 AWG copper or
equivalent conductor to ensure effective grounding.
10. What is the maximum number of 12 AWG conductors allowed in
a 3/4-inch EMT conduit?
A. 8
B. 10
C. 12
D. 14
The NEC provides conduit fill tables; for 3/4-inch EMT, a maximum of
12 12-AWG conductors ensures proper heat dissipation and code
compliance.
11. What is the required marking for flexible cords that are rated for
temporary use?
A. THHN
B. SJT
C. UF-B
D. XHHW
SJT cords are specifically rated for temporary use, providing flexibility
and insulation for temporary applications.
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the maximum allowable voltage drop for a feeder circuit
under the National Electrical Code (NEC)?
A. 1%
B. 2%
C. 3%
D. 5%
The NEC recommends that voltage drop not exceed 3% for feeders to
ensure efficient operation and prevent excessive energy loss.
2. According to the NEC, what is the minimum burial depth for a
120/240V nonmetallic-sheathed cable (NM) in residential
applications?
A. 6 inches
B. 12 inches
C. 24 inches
D. 36 inches
NM cables must be buried at least 24 inches below grade when
installed underground to protect against physical damage.
3. Which of the following types of grounding electrodes is permitted by
the NEC?
A. Wood stakes
B. Plastic rods
C. Metal underground water pipe
D. Fiberglass rods
, Metal underground water pipes are conductive and acceptable as
grounding electrodes if they meet length and conductivity
requirements.
4. What is the primary purpose of an overcurrent protective device?
A. To reduce electricity bills
B. To measure energy consumption
C. To protect conductors and equipment from excessive current
D. To ground the electrical system
Overcurrent protective devices, such as fuses and circuit breakers,
prevent overheating and potential fires by interrupting excess
current.
5. In a three-phase, four-wire system, what is the relationship between
line voltage and phase voltage?
A. Line voltage = Phase voltage ÷ √3
B. Line voltage = Phase voltage × 2
C. Line voltage = Phase voltage ÷ 2
D. Line voltage = Phase voltage × √3
In a three-phase system, the line-to-line voltage is √3 times the phase
voltage, as defined by three-phase vector relationships.
6. Which conductor color is typically used for a grounded (neutral)
conductor in the U.S.?
A. Red
B. Black
C. White
D. Green
White is standardized in the NEC for neutral conductors to distinguish
them from hot and ground wires.
7. What is the minimum working space required in front of electrical
panels rated 600 volts or less?
A. 24 inches
B. 36 inches
C. 48 inches
D. 60 inches
The NEC requires 36 inches of clear working space to allow safe
operation and maintenance of electrical equipment.
, 8. Which type of conduit is permitted to be used in damp or wet
locations?
A. PVC schedule 40
B. RMC (Rigid Metal Conduit)
C. EMT (Electrical Metallic Tubing) without coating
D. NM cable
RMC is corrosion-resistant and suitable for wet or damp
environments, providing mechanical protection and moisture
resistance.
9. What is the NEC-required minimum size for a grounding electrode
conductor connecting to a 200-amp service?
A. 6 AWG copper
B. 4 AWG copper
C. 4 AWG aluminum
D. 8 AWG copper
A 200-amp service typically requires at least a 4 AWG copper or
equivalent conductor to ensure effective grounding.
10. What is the maximum number of 12 AWG conductors allowed in
a 3/4-inch EMT conduit?
A. 8
B. 10
C. 12
D. 14
The NEC provides conduit fill tables; for 3/4-inch EMT, a maximum of
12 12-AWG conductors ensures proper heat dissipation and code
compliance.
11. What is the required marking for flexible cords that are rated for
temporary use?
A. THHN
B. SJT
C. UF-B
D. XHHW
SJT cords are specifically rated for temporary use, providing flexibility
and insulation for temporary applications.
