Nevada C-2 Electrical Contractor Exam
Newest 2025-2026 Update Questions
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1. A residential branch circuit is protected by a 20-amp breaker. What is the
maximum allowable load on this circuit under NEC guidelines?
A. 12 amps
B. 16 amps
C. 20 amps
D. 24 amps
Answer: B
Rationale: Continuous loads should not exceed 80% of breaker capacity,
so 20A × 0.8 = 16A.
2. According to NEC, what is the minimum working clearance in front of
electrical equipment rated 600V or less?
A. 2 feet
B. 3 feet
C. 4 feet
D. 5 feet
Answer: B
Rationale: NEC requires at least 3 feet of clear working space in front of
electrical equipment.
,3. What is the primary purpose of a ground-fault circuit interrupter (GFCI)?
A. Prevent overloads
B. Reduce arc faults
C. Protect against shock hazards
D. Increase circuit capacity
Answer: C
Rationale: GFCIs protect people from electric shock by detecting ground
faults.
4. A 240V single-phase load draws 30 amps. What is the apparent power?
A. 3,600 VA
B. 6,000 VA
C. 7,200 VA
D. 8,400 VA
Answer: C
Rationale: VA = V × I = 240 × 30 = 7,200 VA.
5. Which wire is typically used as the grounding conductor in residential
wiring?
A. Black
B. Red
C. White
D. Bare copper
Answer: D
Rationale: Bare copper or green insulation is used for grounding.
6. What is the maximum number of 12 AWG conductors allowed in a standard
1/2-inch EMT conduit (approximate fill)?
A. 4
B. 6
C. 9
D. 12
Answer: C
, Rationale: Conduit fill tables allow about 9 conductors depending on
insulation type.
7. A circuit breaker trips repeatedly. What is the most likely cause?
A. High voltage
B. Overloaded circuit
C. Low resistance ground
D. Excessive conductor size
Answer: B
Rationale: Overload is the most common reason breakers trip.
8. What is the function of a transformer?
A. Store electrical energy
B. Change AC voltage levels
C. Convert AC to DC
D. Limit current flow only
Answer: B
Rationale: Transformers step voltage up or down using electromagnetic
induction.
9. Which NEC article covers grounding and bonding?
A. Article 240
B. Article 250
C. Article 300
D. Article 310
Answer: B
Rationale: NEC Article 250 covers grounding and bonding requirements.
10.What is the resistance of a circuit with 120V and 10A current?
A. 1 ohm
B. 10 ohms
C. 12 ohms
D. 120 ohms
Answer: C
Rationale: Ohm’s Law: R = V/I = 120/10 = 12 ohms.
Newest 2025-2026 Update Questions
Fast Reviwed From Actual Exams 100
Questions And 100% Verified Answers
With Convenient Explanations Grade A+
Q&A | Instant Download Pdf
1. A residential branch circuit is protected by a 20-amp breaker. What is the
maximum allowable load on this circuit under NEC guidelines?
A. 12 amps
B. 16 amps
C. 20 amps
D. 24 amps
Answer: B
Rationale: Continuous loads should not exceed 80% of breaker capacity,
so 20A × 0.8 = 16A.
2. According to NEC, what is the minimum working clearance in front of
electrical equipment rated 600V or less?
A. 2 feet
B. 3 feet
C. 4 feet
D. 5 feet
Answer: B
Rationale: NEC requires at least 3 feet of clear working space in front of
electrical equipment.
,3. What is the primary purpose of a ground-fault circuit interrupter (GFCI)?
A. Prevent overloads
B. Reduce arc faults
C. Protect against shock hazards
D. Increase circuit capacity
Answer: C
Rationale: GFCIs protect people from electric shock by detecting ground
faults.
4. A 240V single-phase load draws 30 amps. What is the apparent power?
A. 3,600 VA
B. 6,000 VA
C. 7,200 VA
D. 8,400 VA
Answer: C
Rationale: VA = V × I = 240 × 30 = 7,200 VA.
5. Which wire is typically used as the grounding conductor in residential
wiring?
A. Black
B. Red
C. White
D. Bare copper
Answer: D
Rationale: Bare copper or green insulation is used for grounding.
6. What is the maximum number of 12 AWG conductors allowed in a standard
1/2-inch EMT conduit (approximate fill)?
A. 4
B. 6
C. 9
D. 12
Answer: C
, Rationale: Conduit fill tables allow about 9 conductors depending on
insulation type.
7. A circuit breaker trips repeatedly. What is the most likely cause?
A. High voltage
B. Overloaded circuit
C. Low resistance ground
D. Excessive conductor size
Answer: B
Rationale: Overload is the most common reason breakers trip.
8. What is the function of a transformer?
A. Store electrical energy
B. Change AC voltage levels
C. Convert AC to DC
D. Limit current flow only
Answer: B
Rationale: Transformers step voltage up or down using electromagnetic
induction.
9. Which NEC article covers grounding and bonding?
A. Article 240
B. Article 250
C. Article 300
D. Article 310
Answer: B
Rationale: NEC Article 250 covers grounding and bonding requirements.
10.What is the resistance of a circuit with 120V and 10A current?
A. 1 ohm
B. 10 ohms
C. 12 ohms
D. 120 ohms
Answer: C
Rationale: Ohm’s Law: R = V/I = 120/10 = 12 ohms.
