NEVADA CONTRACTOR C-2 ELECTRICAL EXAM | ALL
QUESTIONS AND ANSWERS (VERIFIED ANSWERS) PLUS
DETAILED RATIONALES | COMPLETE STUDY GUIDE |
DOWNLOAD INSTANT PDF 2027-2028
1. What is the minimum size copper equipment grounding conductor required for a branch
circuit protected by a 20-ampere overcurrent protective device according to the National
Electrical Code?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Answer: A
According to NEC Table 250.122, a 20-ampere overcurrent protective device requires a
minimum 14 AWG copper equipment grounding conductor.
2. When calculating the total load for a commercial office building service using the
standard method, what general lighting load demand factor is applied to the first 20,000
volt-amperes?
A. 100 percent
B. 70 percent
C. 50 percent
D. 40 percent
Answer: A
NEC Table 220.12 specifies that for office buildings, the first 20,000 volt-amperes of the
general lighting load must be calculated at 100 percent demand factor.
3. What is the maximum allowable ampacity of a 3/0 AWG THHN copper conductor
operating in a raceway with an ambient temperature of 30 degrees Celsius and no more
than three current-carrying conductors?
A. 150 amperes
B. 175 amperes
C. 200 amperes
D. 225 amperes
Answer: C
,NEC Table 310.16 lists the allowable ampacity for 3/0 AWG THHN copper conductors at the
90-degree Celsius column as 200 amperes.
4. Which type of cable assembly is specifically permitted by the NEC for installation in
cable trays under industrial establishment conditions?
A. Type NM cable
B. Type MC cable
C. Type SE cable
D. Type UF cable
Answer: B
Type Metal-Clad (MC) cable is widely approved under NEC Article 330 for use in cable trays,
damp locations, and various industrial raceway environments.
5. In a three-phase, four-wire wye system operating at 208Y/120 volts, what is the line-to-
neutral voltage available at a standard duplex receptacle?
A. 120 volts
B. 208 volts
C. 240 volts
D. 277 volts
Answer: A
In a 208Y/120 volt three-phase system, the voltage measured between any single phase leg and
the neutral conductor is 120 volts.
6. What is the minimum working clearance depth required in front of a 480-volt electrical
switchboard where there are exposed live parts on one side and grounded parts on the
opposite side (Condition 2)?
A. 3.0 feet
B. 3.5 feet
C. 4.0 feet
D. 5.0 feet
Answer: B
NEC Table 110.26(A)(1) specifies a minimum working clearance depth of 3.5 feet for 480-volt
systems under Condition 2 exposure criteria.
7. When installing nonmetallic-sheathed cable (Type NM) through wood framing members,
what is the mandatory minimum distance holes must be bored from the edge of the stud?
,A. 0.5 inches
B. 1.0 inch
C. 1.25 inches
D. 2.0 inches
Answer: C
NEC Section 300.4(A)(1) requires that holes bored in wood studs for cable protection be at
least 1.25 inches from the edge, or protected by a steel nail plate.
8. What is the standard trip rating percentage for continuous duty loads when sizing
standard branch circuit overcurrent protective devices?
A. 80 percent
B. 100 percent
C. 125 percent
D. 150 percent
Answer: C
Branch circuit overcurrent protective devices must typically be rated at 100 percent of
noncontinuous loads plus 125 percent of continuous loads per NEC Article 210.
9. Which of the following conduit bodies is permitted to contain spliced or tapped
conductors provided it is marked with its cubic inch volume capacity?
A. Type LB conduit body under 2 inches
B. Type LB conduit body containing conductors of any size without volume markings
C. Type LB conduit body with a volume marked capacity complying with NEC 314.16(C)(2)
D. Conduit bodies are strictly prohibited from housing splices under all conditions
Answer: C
NEC Section 314.16(C)(2) permits splices and taps inside conduit bodies if the component is
marked with its cubic inch capacity and sized correctly.
10. What is the maximum percentage of conduit cross-sectional area fill permitted for a
raceway containing four or more THHN current-carrying conductors?
A. 31 percent
B. 40 percent
C. 53 percent
D. 60 percent
Answer: A
, Chapter 9 Table 1 of the NEC mandates a maximum fill capacity of 40 percent for two
conductors, 53 percent for one conductor, and 31 percent for four or more conductors.
11. Which testing instrument is primarily utilized to verify the insulation resistance
integrity of high-voltage feeder cables prior to energization?
A. Standard digital clamp meter
B. Insulation resistance tester (Megohmmeter or Megger)
C. Analog volt-ohm multimeter
D. Circuit tracer
Answer: B
A megohmmeter applies high DC test voltage to measure insulation resistance in megaohms,
verifying cable dielectric health and preventing catastrophic short circuits.
12. According to NEC Article 250, what is the minimum size grounding electrode
conductor required when connecting to a made electrode consisting of a single driven 8-
foot ground rod made of copper-clad steel, using copper wire?
A. 8 AWG
B. 6 AWG
C. 4 AWG
D. 2 AWG
Answer: A
NEC Table 250.66 specifies that when a grounding electrode conductor is connected solely to
a driven rod electrode, the copper conductor is not required to be larger than 8 AWG.
13. In a residential kitchen, all 125-volt, single-phase, 15- and 20-ampere receptacles
installed to serve countertop surfaces require which type of electrical protection?
A. Standard thermal-magnetic breaker protection only
B. Arc-Fault Circuit-Interrupter (AFCI) protection
C. Ground-Fault Circuit-Interrupter (GFCI) protection
D. Both AFCI and GFCI protection where mandated by current NEC rules
Answer: D
Modern NEC requirements specify that kitchen countertop receptacles require both AFCI
protection and GFCI protection to mitigate shock and fire hazards.
14. What is the minimum burial depth required for rigid metal conduit (RMC) installed
beneath a residential driveway carrying vehicular traffic?
QUESTIONS AND ANSWERS (VERIFIED ANSWERS) PLUS
DETAILED RATIONALES | COMPLETE STUDY GUIDE |
DOWNLOAD INSTANT PDF 2027-2028
1. What is the minimum size copper equipment grounding conductor required for a branch
circuit protected by a 20-ampere overcurrent protective device according to the National
Electrical Code?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Answer: A
According to NEC Table 250.122, a 20-ampere overcurrent protective device requires a
minimum 14 AWG copper equipment grounding conductor.
2. When calculating the total load for a commercial office building service using the
standard method, what general lighting load demand factor is applied to the first 20,000
volt-amperes?
A. 100 percent
B. 70 percent
C. 50 percent
D. 40 percent
Answer: A
NEC Table 220.12 specifies that for office buildings, the first 20,000 volt-amperes of the
general lighting load must be calculated at 100 percent demand factor.
3. What is the maximum allowable ampacity of a 3/0 AWG THHN copper conductor
operating in a raceway with an ambient temperature of 30 degrees Celsius and no more
than three current-carrying conductors?
A. 150 amperes
B. 175 amperes
C. 200 amperes
D. 225 amperes
Answer: C
,NEC Table 310.16 lists the allowable ampacity for 3/0 AWG THHN copper conductors at the
90-degree Celsius column as 200 amperes.
4. Which type of cable assembly is specifically permitted by the NEC for installation in
cable trays under industrial establishment conditions?
A. Type NM cable
B. Type MC cable
C. Type SE cable
D. Type UF cable
Answer: B
Type Metal-Clad (MC) cable is widely approved under NEC Article 330 for use in cable trays,
damp locations, and various industrial raceway environments.
5. In a three-phase, four-wire wye system operating at 208Y/120 volts, what is the line-to-
neutral voltage available at a standard duplex receptacle?
A. 120 volts
B. 208 volts
C. 240 volts
D. 277 volts
Answer: A
In a 208Y/120 volt three-phase system, the voltage measured between any single phase leg and
the neutral conductor is 120 volts.
6. What is the minimum working clearance depth required in front of a 480-volt electrical
switchboard where there are exposed live parts on one side and grounded parts on the
opposite side (Condition 2)?
A. 3.0 feet
B. 3.5 feet
C. 4.0 feet
D. 5.0 feet
Answer: B
NEC Table 110.26(A)(1) specifies a minimum working clearance depth of 3.5 feet for 480-volt
systems under Condition 2 exposure criteria.
7. When installing nonmetallic-sheathed cable (Type NM) through wood framing members,
what is the mandatory minimum distance holes must be bored from the edge of the stud?
,A. 0.5 inches
B. 1.0 inch
C. 1.25 inches
D. 2.0 inches
Answer: C
NEC Section 300.4(A)(1) requires that holes bored in wood studs for cable protection be at
least 1.25 inches from the edge, or protected by a steel nail plate.
8. What is the standard trip rating percentage for continuous duty loads when sizing
standard branch circuit overcurrent protective devices?
A. 80 percent
B. 100 percent
C. 125 percent
D. 150 percent
Answer: C
Branch circuit overcurrent protective devices must typically be rated at 100 percent of
noncontinuous loads plus 125 percent of continuous loads per NEC Article 210.
9. Which of the following conduit bodies is permitted to contain spliced or tapped
conductors provided it is marked with its cubic inch volume capacity?
A. Type LB conduit body under 2 inches
B. Type LB conduit body containing conductors of any size without volume markings
C. Type LB conduit body with a volume marked capacity complying with NEC 314.16(C)(2)
D. Conduit bodies are strictly prohibited from housing splices under all conditions
Answer: C
NEC Section 314.16(C)(2) permits splices and taps inside conduit bodies if the component is
marked with its cubic inch capacity and sized correctly.
10. What is the maximum percentage of conduit cross-sectional area fill permitted for a
raceway containing four or more THHN current-carrying conductors?
A. 31 percent
B. 40 percent
C. 53 percent
D. 60 percent
Answer: A
, Chapter 9 Table 1 of the NEC mandates a maximum fill capacity of 40 percent for two
conductors, 53 percent for one conductor, and 31 percent for four or more conductors.
11. Which testing instrument is primarily utilized to verify the insulation resistance
integrity of high-voltage feeder cables prior to energization?
A. Standard digital clamp meter
B. Insulation resistance tester (Megohmmeter or Megger)
C. Analog volt-ohm multimeter
D. Circuit tracer
Answer: B
A megohmmeter applies high DC test voltage to measure insulation resistance in megaohms,
verifying cable dielectric health and preventing catastrophic short circuits.
12. According to NEC Article 250, what is the minimum size grounding electrode
conductor required when connecting to a made electrode consisting of a single driven 8-
foot ground rod made of copper-clad steel, using copper wire?
A. 8 AWG
B. 6 AWG
C. 4 AWG
D. 2 AWG
Answer: A
NEC Table 250.66 specifies that when a grounding electrode conductor is connected solely to
a driven rod electrode, the copper conductor is not required to be larger than 8 AWG.
13. In a residential kitchen, all 125-volt, single-phase, 15- and 20-ampere receptacles
installed to serve countertop surfaces require which type of electrical protection?
A. Standard thermal-magnetic breaker protection only
B. Arc-Fault Circuit-Interrupter (AFCI) protection
C. Ground-Fault Circuit-Interrupter (GFCI) protection
D. Both AFCI and GFCI protection where mandated by current NEC rules
Answer: D
Modern NEC requirements specify that kitchen countertop receptacles require both AFCI
protection and GFCI protection to mitigate shock and fire hazards.
14. What is the minimum burial depth required for rigid metal conduit (RMC) installed
beneath a residential driveway carrying vehicular traffic?
