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100+ Free NV C-2A Electrical Wiring Practice Questions

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2026 Statistics

Key Facts: NV C-2A Electrical Wiring Exam

60 Q

Official Exam Questions

PSI Nevada Contractor CIB updated 3/25/2026

70%

Passing Score

PSI Nevada Contractor CIB updated 3/25/2026

2.5 hours

Time Allowed

PSI Nevada Contractor CIB updated 3/25/2026

USD 95

PSI Exam Fee (one portion)

PSI Nevada Contractor CIB updated 3/25/2026

Open Book

Book Policy

PSI Nevada Contractor CIB updated 3/25/2026

Nevada C-2A Electrical Wiring Contractor Examination is the official NSCB/PSI open book exam: 60 questions, 70% (42 of 60 points), 2.5 hours, USD 95 (bulletin 270, updated 3/25/2026). Official delivery: English.

Sample NV C-2A Electrical Wiring Practice Questions

Try these sample questions to test your NV C-2A Electrical Wiring exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A resistive heater on an existing 120-volt branch circuit draws 8 amperes. What is the heater resistance?
A.8 ohms
B.15 ohms
C.96 ohms
D.960 ohms
Explanation: Ohm's law is E = I × R, so R = E / I. Dividing 120 volts by 8 amperes yields 15 ohms. Nevada C-2A Electrical Wiring is an open-book NEC 2017 exam, but basic circuit math is still tested under general electrical knowledge and is not looked up in a table.
2Per NEC Article 100, a continuous load is a load whose maximum current is expected to continue for at least how long?
A.1 hour
B.2 hours
C.3 hours
D.8 hours
Explanation: NEC Article 100 defines a continuous load as one in which the maximum current is expected to continue for 3 hours or more. That definition drives the 125 percent conductor and overcurrent-device sizing rules in 210.19, 210.20, 215.2, and 215.3. Store lighting and similar existing commercial loads are commonly treated as continuous.
3A 480-volt, 3-phase panel on an existing building supplies a balanced 30-kilowatt load at unity power factor. What is the line current?
A.36 amperes
B.42 amperes
C.62 amperes
D.125 amperes
Explanation: Three-phase current is I = P / (1.732 × E × PF). At unity power factor, I = 30,000 / (1.732 × 480) = 36.1 amperes, which rounds to 36 amperes. Use 1.732 (√3), not 3 or 2, for balanced three-phase line current.
4On a 4-wire, 120/240-volt, 3-phase, high-leg delta service being upgraded on an existing structure, the high-leg conductor must be identified by which color?
A.White
B.Green
C.Orange or other effective means
D.Gray
Explanation: NEC 110.15 and 230.56 require the high-leg (wild-leg) conductor on a 4-wire delta system to be durably marked orange or identified by other effective means. The high-leg is approximately 208 volts to ground and must be the B phase in panelboards so 120-volt breakers are not landed on it.
5A balanced 480-volt, 3-phase existing motor feeder carries 40 amperes at 0.85 power factor. What is the true power?
A.16.3 kW
B.19.2 kW
C.28.3 kW
D.33.3 kW
Explanation: True power is P = 1.732 × E × I × PF. Substituting gives 1.732 × 480 × 40 × 0.85 = 28,265 watts, or 28.3 kW. Apparent power would be 33.3 kVA (no PF). C-2A general-knowledge items routinely mix kW and kVA on existing commercial feeders.
6An existing 240-volt, single-phase electric furnace is nameplated 12 kW at unity power factor. What is the load current used for branch-circuit calculations?
A.25 amperes
B.50 amperes
C.58 amperes
D.100 amperes
Explanation: Single-phase current is I = P / E. 12,000 watts / 240 volts = 50 amperes. Fixed electric space-heating is sized as a continuous load in 424.3/424.4, so conductors and the overcurrent device are then taken at 125 percent of this 50-ampere current (62.5 A).
7Two equal resistive loads are reconnected from series to parallel on the same existing 120-volt source. What happens to source current?
A.It stays the same
B.It doubles
C.It becomes four times as large
D.It falls to one-fourth
Explanation: Two equal resistors in series draw I = E / 2R. In parallel the equivalent resistance is R/2, so I = E / (R/2) = 4E / 2R, four times the series current. Parallel reconnection of equal loads on a fixed voltage therefore quadruples source current, which can overload an existing branch circuit.
8In a dwelling being rewired, receptacle outlets along an unbroken wall space in a habitable room must be installed so that no point along the floor line is more than how far from a receptacle?
A.4 feet
B.6 feet
C.8 feet
D.12 feet
Explanation: NEC 210.52(A)(1) is the 6-foot / 12-foot wall-spacing rule: no point along the floor line of any wall space may be more than 6 feet from a receptacle outlet. That typically places receptacles at no more than 12 feet on center, with the first outlet within 6 feet of a door opening.
9NEC 210.11(C)(1) requires at least how many 20-ampere small-appliance branch circuits for the kitchen, pantry, breakfast room, dining room, or similar area of a dwelling unit?
A.One
B.Two
C.Three
D.Four
Explanation: NEC 210.11(C)(1) requires at least two 20-ampere small-appliance branch circuits to supply receptacle outlets in those kitchen and dining areas. They may supply only the small-appliance receptacle loads specified in 210.52(B) and are included at 1,500 VA each in Article 220 calculations.
10The bathroom receptacle outlet required by 210.52(D) in an existing dwelling must be supplied by at least one 20-ampere branch circuit. That circuit may also supply which of the following?
A.Receptacle outlets in other bathrooms, and in one bathroom it may also supply other equipment in that bathroom
B.Kitchen counter receptacles on the same floor
C.The dwelling laundry receptacle
D.Outdoor receptacles at the front and rear
Explanation: NEC 210.11(C)(3) requires at least one 20-ampere branch circuit to supply bathroom receptacle outlet(s). It may serve receptacle outlets in more than one bathroom. The exception permits that circuit to also supply other equipment in the same bathroom if it supplies a single bathroom and no other bathrooms.

About the NV C-2A Electrical Wiring Exam

The Nevada C-2A Electrical Wiring Contractor Examination is the official Nevada State Contractors Board trade or management examination administered by PSI Services LLC. The official exam has 60 scored questions. Passing is 70% (42 of 60 points) in 2.5 hours. The examination is open book. Approved center references include NEC 2017 and NFPA 72 (2010) (allowed in center). PSI lists USD 95 for one examination portion and USD 140 if taken with CMS; otherwise USD 95 per trade exam (Candidate Information Bulletin updated 3/25/2026). NSCB requires a separate CMS examination for most new applicants, plus a USD 300 application fee and a USD 600 biennial license fee. This English-language MCQ bank is a study aid, not an official PSI form. It does not replace required trade experience, board approval, fingerprints, bonding, or the official examination.

Assessment

Open Book computer-based multiple-choice. NEC 2017 and NFPA 72 (2010) (allowed in center)

Time Limit

2.5 hours

Passing Score

70% (42 of 60 points)

Exam Fee

USD 95 (PSI Services LLC (for the Nevada State Contractors Board))

NV C-2A Electrical Wiring Exam Content Outline

7%

General Electrical Knowledge

Electrical theory (4 items)

8%

Service, Feeders, and Branch Circuits

Services, feeders, and branch circuits (5 items)

10%

Grounding and Bonding

Grounding and bonding (6 items)

13%

Conductors and Cables

Conductors and cables (8 items)

7%

Overcurrent Protection

Overcurrent protection (4 items)

8%

Special Occupancies and Equipment

Special occupancies and equipment (5 items)

8%

Electrical Power

Electrical power (5 items)

3%

Low Voltage

Low voltage (2 items)

7%

Lighting

Lighting (4 items)

3%

Illuminated Signs

Illuminated signs (2 items)

7%

Fire Detection and Alarm Systems

Fire detection and alarms (4 items)

5%

Safety Information

Electrical safety (3 items)

5%

Motors

Motors (3 items)

8%

Raceways and Enclosures

Raceways and enclosures (5 items)

How to Pass the NV C-2A Electrical Wiring Exam

What You Need to Know

  • Passing score: 70% (42 of 60 points)
  • Assessment: Open Book computer-based multiple-choice. NEC 2017 and NFPA 72 (2010) (allowed in center)
  • Time limit: 2.5 hours
  • Exam fee: USD 95

Keys to Passing

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

NV C-2A Electrical Wiring Study Tips from Top Performers

1Distribute study time to the official bulletin 270 content outline (updated 3/25/2026)
2Use only the PSI-listed references; temporary tabs such as Post-it notes are prohibited
3Confirm NSCB experience documentation before scheduling with PSI
4This bank is an English-language MCQ study aid, not an official PSI form

Frequently Asked Questions

How many questions are on the Nevada C-2A Electrical Wiring Contractor Examination?

The official PSI examination has 60 scored questions. Passing is 70% (42 of 60 points) within 2.5 hours (Candidate Information Bulletin 270, updated 3/25/2026).

How much does the NV C-2A Electrical Wiring exam cost?

PSI lists USD 95 for one examination portion. Two portions cost USD 140 only if the second portion is CMS. NSCB charges a separate USD 300 application fee and USD 600 biennial license fee.

Is the NV C-2A Electrical Wiring exam open book?

Yes. PSI lists this examination as open book. NEC 2017 and NFPA 72 (2010) (allowed in center)

Do I still need the CMS examination?

CMS is the required Nevada business-and-law examination. Most new applicants must pass CMS and a trade examination for the requested classification. In most cases you will not retake an exam if you have actively served as a qualified employee in the same classification within the last four years.