NEVADA C-2 ELECTRICAL CONTRACTOR EXAM – COMPLETE QUESTIONS AND ANSWERS | VERIFIED AND WELL-
DETAILED ANSWERS | EXPERT RATIONALES | COMPREHENSIVE EXAM PREPARATION | LATEST EXAM UPDATE
CORE KNOWLEDGE DOMAINS
General Electrical Knowledge and Theory
Service, Feeders, and Branch Circuit Calculations
Grounding, Bonding, and Overcurrent Protection
Conductors, Cables, Raceways, and Boxes
Motors, Controls, and Electrical Power Systems
Special Occupancies, Equipment, and Low Voltage Applications
Lighting Systems, Illuminated Signs, and Fire Detection
Nevada Contractor Law, Licensing, and Business Practices
OSHA Safety Regulations and NFPA 70E Workplace Standards
Plan Reading, Estimating, and Project Management
INTRODUCTION
,This assessment is designed to evaluate the knowledge and competency of candidates preparing for the Nevada C-2
Electrical Contractor examination. It measures mastery of the National Electrical Code, Nevada Administrative Code,
electrical theory, and practical application. The multiple-choice structure includes realistic scenario-based questions
that require critical thinking, problem-solving, and professional judgment. By simulating realistic examination
situations, this resource helps candidates apply their knowledge to real-world electrical contracting decisions while
reinforcing safe, compliant, and ethical practices.
SECTION ONE — QUESTIONS 1–100
1. A contractor is installing a new electrical service for a small commercial building. The calculated load is 180
amperes. What is the minimum standard size service disconnecting means required?
A. 150 amperes
B. 175 amperes
✓ C. 200 amperes
D. 225 amperes
▸ Expert Rationale: The service equipment must have an ampacity not less than the calculated load. Standard
ampere ratings for disconnecting means include 200 amperes. Since 175 amperes is not a standard size for this
application, the next standard size of 200 amperes is required to safely carry the calculated load.
2. What is the primary purpose of bonding in an electrical system?
,A. To provide a return path for normal operating current
✓ B. To ensure a low-impedance path for fault current
C. To increase the overall resistance of the grounding system
D. To reduce voltage drop on long branch circuits
▸ Expert Rationale: Bonding connects normally non-current-carrying metal parts to establish an effective ground-
fault current path. This low-impedance path facilitates the operation of overcurrent protective devices during a fault,
thereby protecting people and equipment from dangerous voltages.
3. A journeyman electrician is working in a panelboard and discovers a neutral conductor that has been improperly
used as an equipment grounding conductor on a 120-volt branch circuit. What is the primary safety hazard
associated with this condition?
A. The circuit breaker will trip immediately upon energization
✓ B. Metal parts of equipment may become energized under normal operation
C. The voltage at the load will be significantly reduced
D. The neutral conductor will overheat only during fault conditions
▸ Expert Rationale: Using the neutral as an equipment grounding conductor creates a parallel path for neutral
current on metal enclosures and raceways. During normal operation, this can energize metal parts, creating a shock
hazard. The correct method is to run a separate equipment grounding conductor.
, 4. According to the National Electrical Code, what is the maximum allowable continuous load on a 20-ampere circuit
breaker that supplies a continuous duty load?
A. 20 amperes
B. 18 amperes
✓ C. 16 amperes
D. 14 amperes
▸ Expert Rationale: A continuous load is defined as a load where the maximum current is expected to continue for
three hours or more. Overcurrent devices must be sized at 125% of the continuous load. Therefore, a 20-ampere
breaker can supply a continuous load of no more than 16 amperes.
5. An electrical contractor is preparing a bid for a commercial tenant improvement project. The specifications require
all raceways to be electrical metallic tubing (EMT). The contractor notices that the drawings show the EMT passing
through a rated fire wall. What is the appropriate action?
A. Ignore the fire wall requirement since the NEC does not address fire ratings
B. Use rigid metal conduit for the entire run without notifying anyone
✓ C. Verify the required firestop assembly and ensure proper penetration sealing
D. Substitute PVC conduit through the fire wall to simplify the installation
▸ Expert Rationale: Penetrations through fire-rated walls must maintain the fire-resistance rating of the assembly.
DETAILED ANSWERS | EXPERT RATIONALES | COMPREHENSIVE EXAM PREPARATION | LATEST EXAM UPDATE
CORE KNOWLEDGE DOMAINS
General Electrical Knowledge and Theory
Service, Feeders, and Branch Circuit Calculations
Grounding, Bonding, and Overcurrent Protection
Conductors, Cables, Raceways, and Boxes
Motors, Controls, and Electrical Power Systems
Special Occupancies, Equipment, and Low Voltage Applications
Lighting Systems, Illuminated Signs, and Fire Detection
Nevada Contractor Law, Licensing, and Business Practices
OSHA Safety Regulations and NFPA 70E Workplace Standards
Plan Reading, Estimating, and Project Management
INTRODUCTION
,This assessment is designed to evaluate the knowledge and competency of candidates preparing for the Nevada C-2
Electrical Contractor examination. It measures mastery of the National Electrical Code, Nevada Administrative Code,
electrical theory, and practical application. The multiple-choice structure includes realistic scenario-based questions
that require critical thinking, problem-solving, and professional judgment. By simulating realistic examination
situations, this resource helps candidates apply their knowledge to real-world electrical contracting decisions while
reinforcing safe, compliant, and ethical practices.
SECTION ONE — QUESTIONS 1–100
1. A contractor is installing a new electrical service for a small commercial building. The calculated load is 180
amperes. What is the minimum standard size service disconnecting means required?
A. 150 amperes
B. 175 amperes
✓ C. 200 amperes
D. 225 amperes
▸ Expert Rationale: The service equipment must have an ampacity not less than the calculated load. Standard
ampere ratings for disconnecting means include 200 amperes. Since 175 amperes is not a standard size for this
application, the next standard size of 200 amperes is required to safely carry the calculated load.
2. What is the primary purpose of bonding in an electrical system?
,A. To provide a return path for normal operating current
✓ B. To ensure a low-impedance path for fault current
C. To increase the overall resistance of the grounding system
D. To reduce voltage drop on long branch circuits
▸ Expert Rationale: Bonding connects normally non-current-carrying metal parts to establish an effective ground-
fault current path. This low-impedance path facilitates the operation of overcurrent protective devices during a fault,
thereby protecting people and equipment from dangerous voltages.
3. A journeyman electrician is working in a panelboard and discovers a neutral conductor that has been improperly
used as an equipment grounding conductor on a 120-volt branch circuit. What is the primary safety hazard
associated with this condition?
A. The circuit breaker will trip immediately upon energization
✓ B. Metal parts of equipment may become energized under normal operation
C. The voltage at the load will be significantly reduced
D. The neutral conductor will overheat only during fault conditions
▸ Expert Rationale: Using the neutral as an equipment grounding conductor creates a parallel path for neutral
current on metal enclosures and raceways. During normal operation, this can energize metal parts, creating a shock
hazard. The correct method is to run a separate equipment grounding conductor.
, 4. According to the National Electrical Code, what is the maximum allowable continuous load on a 20-ampere circuit
breaker that supplies a continuous duty load?
A. 20 amperes
B. 18 amperes
✓ C. 16 amperes
D. 14 amperes
▸ Expert Rationale: A continuous load is defined as a load where the maximum current is expected to continue for
three hours or more. Overcurrent devices must be sized at 125% of the continuous load. Therefore, a 20-ampere
breaker can supply a continuous load of no more than 16 amperes.
5. An electrical contractor is preparing a bid for a commercial tenant improvement project. The specifications require
all raceways to be electrical metallic tubing (EMT). The contractor notices that the drawings show the EMT passing
through a rated fire wall. What is the appropriate action?
A. Ignore the fire wall requirement since the NEC does not address fire ratings
B. Use rigid metal conduit for the entire run without notifying anyone
✓ C. Verify the required firestop assembly and ensure proper penetration sealing
D. Substitute PVC conduit through the fire wall to simplify the installation
▸ Expert Rationale: Penetrations through fire-rated walls must maintain the fire-resistance rating of the assembly.
