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100+ Free NV C-2F Residential Wiring Practice Questions

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2026 Statistics

Key Facts: NV C-2F Residential Wiring Exam

50 Q

Official Exam Questions

PSI Nevada Contractor CIB updated 3/25/2026

70%

Passing Score

PSI Nevada Contractor CIB updated 3/25/2026

2 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-2F Residential Wiring Contractor Examination is the official NSCB/PSI open book exam: 50 questions, 70% (35 of 50 points), 2 hours, USD 95 (bulletin 270, updated 3/25/2026). Official delivery: English.

Sample NV C-2F Residential Wiring Practice Questions

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

1Per NAC 624.200, a Nevada C-2F residential wiring contractor may install, alter, and repair electrical wires, fixtures, appliances, and apparatuses not exceeding which voltage, and on which structures?
A.150 volts, existing structures of any height
B.300 volts, new one-family dwellings only
C.1,000 volts, any new or existing building
D.600 volts, new or existing structures not more than three stories above ground
Explanation: NAC 624.200(2)(f) limits C-2F to electrical wires, fixtures, appliances, and apparatuses whose electrical current does not exceed 600 volts on new or existing structures that do not exceed more than three stories above the ground. That is narrower than unlimited C-2 electrical work and different from C-2A, which is existing-structure wiring without the three-story residential limit. PSI Nevada C-2F is an open-book NEC 2017 trade exam for this residential classification only.
2A 120-volt dwelling branch circuit supplies a purely resistive 12-ohm heating element. What is the current?
A.10 amperes
B.6 amperes
C.12 amperes
D.14.4 amperes
Explanation: Ohm's law is I = E / R. 120 volts divided by 12 ohms equals 10 amperes. The same result follows from P = E² / R = 1,440 watts, then I = P / E = 1,440 / 120 = 10 amperes. PSI C-2F general-knowledge items expect this basic single-phase relationship from NEC Article 100 definitions and standard electrical theory.
3A 240-volt, single-phase residential water heater draws 18.75 amperes. What is its power?
A.4,500 watts
B.2,250 watts
C.3,600 watts
D.5,000 watts
Explanation: Single-phase power is P = E × I for a resistive load. 240 volts × 18.75 amperes = 4,500 watts. That is the common 4.5 kW dwelling water-heater nameplate used in Article 220 load calculations. Do not treat a 240-volt two-wire heater as two 120-volt loads.
4One horsepower equals which approximate electrical power?
A.100 watts
B.480 watts
C.1,000 watts
D.746 watts
Explanation: One mechanical horsepower equals 746 watts. Residential motor and appliance estimates convert horsepower to watts with that constant before applying Article 430 or 440 current tables. Do not use 1,000 watts (1 kVA) as a horsepower conversion.
5Per NEC 2017 110.26(A)(1) Condition 1, what is the minimum working-space depth in front of a 120/240-volt dwelling panelboard with exposed live parts on one side and no live or grounded parts on the other side?
A.36 inches
B.24 inches
C.42 inches
D.48 inches
Explanation: Table 110.26(A)(1) Condition 1 requires 900 mm (3 ft) of working space in front of equipment operating at 0 to 150 volts to ground when live parts are on one side and there are no live or grounded parts on the other side. A typical dwelling panel is 120 volts to ground, so 36 inches applies. Measure from the enclosure front, not from the wall behind the panel.
6Per NEC 2017 110.26(A)(2), the width of the working space in front of a dwelling panelboard shall be the width of the equipment or which minimum, whichever is greater?
A.24 inches
B.36 inches
C.42 inches
D.30 inches
Explanation: NEC 110.26(A)(2) requires the working space to be at least 762 mm (30 in.) wide, or the width of the equipment, whichever is greater. The space must also allow the enclosure door or hinged cover to open at least 90 degrees. A narrow loadcenter still needs a full 30-inch-wide clear space in front.
7Per NEC 2017 110.26(A)(3), what is the minimum height of the working space in front of indoor dwelling service equipment that is shorter than 6½ feet?
A.6 feet 6 inches
B.5 feet
C.6 feet
D.8 feet
Explanation: NEC 110.26(A)(3) requires the working space to extend from the grade, floor, or platform to a height of 2.0 m (6½ ft) or the height of the equipment, whichever is greater. For a typical dwelling panel shorter than 6½ feet, the clear height is 6 feet 6 inches.
8On a 120/240-volt single-phase dwelling service, which conductor identification is required by NEC 2017 Articles 200 and 250?
A.White or gray for the equipment grounding conductor and green for the grounded conductor
B.Black for the grounded conductor and white for ungrounded conductors
C.Green, green with yellow stripe, or bare for ungrounded conductors
D.White or gray for the grounded conductor and green, green with yellow stripe, or bare for the equipment grounding conductor
Explanation: NEC 200.6 identifies the grounded conductor with white or gray (or three white/gray stripes). NEC 250.119 identifies the equipment grounding conductor as green, green with one or more yellow stripes, or bare. Ungrounded conductors may be any color other than those reserved colors. Mixing those identities is a common fail on residential services and subpanels.
9Two 20-ohm resistive loads are connected in parallel on a 120-volt dwelling circuit. What is the equivalent resistance?
A.10 ohms
B.40 ohms
C.20 ohms
D.5 ohms
Explanation: Equal resistors in parallel have equivalent resistance R/n. Two 20-ohm resistors in parallel equal 10 ohms. Each branch draws 6 amperes, so the source sees 12 amperes, which is 120 / 10. Series addition (40 ohms) is the opposite connection.
10Per NEC 2017 110.14(C)(1), unless the equipment is listed and identified otherwise, conductor ampacity at terminals rated 100 amperes or less, or marked for 14 AWG through 1 AWG, is selected from which temperature column?
A.90°C column of Table 310.15(B)(16)
B.110°C column
C.30°C ambient column only
D.60°C column of Table 310.15(B)(16)
Explanation: NEC 110.14(C)(1)(a) requires termination ampacity for equipment rated 100 amperes or less, or marked for 14 AWG through 1 AWG conductors, to be based on the 60°C column of Table 310.15(B)(16) unless the equipment is listed and identified for use with 75°C conductors. NM-B insulation may be 90°C, but termination and 334.80 still cap the usable ampacity. Do not size a 100-ampere or smaller dwelling circuit from the 90°C column at the breaker.

About the NV C-2F Residential Wiring Exam

The Nevada C-2F Residential Wiring Contractor Examination is the official Nevada State Contractors Board trade or management examination administered by PSI Services LLC. The official exam has 50 scored questions. Passing is 70% (35 of 50 points) in 2 hours. The examination is open book. Approved center references include National Electrical Code, 2017 (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. National Electrical Code, 2017 (allowed in center)

Time Limit

2 hours

Passing Score

70% (35 of 50 points)

Exam Fee

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

NV C-2F Residential Wiring Exam Content Outline

18%

General Electrical Knowledge

Electrical theory (9 items)

20%

Service, Feeders, and Branch Circuits

Services, feeders, and branch circuits (10 items)

14%

Grounding and Bonding

Grounding and bonding (7 items)

14%

Conductors and Cables

Conductors and cables (7 items)

8%

Overcurrent Protection

Overcurrent protection (4 items)

4%

Electrical Power

Electrical power (2 items)

4%

Low Voltage

Low voltage (2 items)

4%

Fire and Intrusion Detection and Alarm Systems

Fire and intrusion alarms (2 items)

8%

Safety Information

Electrical safety (4 items)

6%

Raceways and Enclosures

Raceways and enclosures (3 items)

How to Pass the NV C-2F Residential Wiring Exam

What You Need to Know

  • Passing score: 70% (35 of 50 points)
  • Assessment: Open Book computer-based multiple-choice. National Electrical Code, 2017 (allowed in center)
  • Time limit: 2 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-2F Residential 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-2F Residential Wiring Contractor Examination?

The official PSI examination has 50 scored questions. Passing is 70% (35 of 50 points) within 2 hours (Candidate Information Bulletin 270, updated 3/25/2026).

How much does the NV C-2F Residential 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-2F Residential Wiring exam open book?

Yes. PSI lists this examination as open book. National Electrical Code, 2017 (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.