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Exam Review

Key Facts: NV C-2E Transmission Lines Exam

40 Q

Official Exam Questions

PSI Nevada Contractor CIB updated 3/25/2026

70%

Passing Score

PSI Nevada Contractor CIB updated 3/25/2026

1.5 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-2E Lines to Transmit Electricity Contractor Examination is the official NSCB/PSI open book exam: 40 questions, 70% (28 of 40 points), 1.5 hours, USD 95 (bulletin 270, updated 3/25/2026). Official delivery: English.

Sample NV C-2E Transmission Lines Practice Questions

Try these sample questions to review concepts for the NV C-2E Transmission Lines exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1On a distribution transformer serving a Nevada C-2E secondary line, the nameplate kVA rating is a rating of:

A.Apparent power the windings can carry continuously at rated voltage and temperature rise

B.Real power in kilowatts that the transformer can deliver only at unity power factor

C.The utility's peak feeder load in megawatts

D.The interrupting rating of the secondary circuit breaker

Explanation: Transformer capacity is stated in kilovolt-amperes because winding heating depends on current, not on load power factor. A 25 kVA tank can deliver 25 kVA continuously at rated voltage and rise whether the load is mostly watts or a mix of watts and vars. Crews use that thermal kVA when sizing secondary leads, connectors, and overcurrent devices under NEC Article 450.

2A single-phase pole-mount transformer serving an overhead secondary is rated 7,200 V primary and 240 V secondary. What is the turns ratio of the windings?

A.10:1

B.24:1

C.30:1

D.240:1

Explanation: Turns ratio equals voltage ratio: Np/Ns = Vp/Vs. Dividing 7,200 by 240 equals 30, so the primary has 30 times as many turns as the secondary. The same ratio predicts primary current from a known secondary load before the tank is energized.

3A 25 kVA single-phase transformer is fully loaded on a 240 V secondary that feeds an overhead secondary bus. What is the approximate full-load secondary current?

A.10 A

B.52 A

C.104 A

D.208 A

Explanation: Single-phase current is I = S / V. Convert 25 kVA to 25,000 VA and divide by 240 V: 25,000 / 240 = 104 A. Use that check when sizing secondary leads, connectors, and expected loading on the 240 V run.

4A 75 kVA, 480–208Y/120 V, three-phase transformer supplies a secondary line. What is the approximate full-load secondary line current?

A.90 A

B.156 A

C.208 A

D.361 A

Explanation: Three-phase current is I = S / (1.732 × V). 75,000 / (1.732 × 208) = 75,000 / 360.3 ≈ 208 A. That 208 A figure is the starting point for NEC Table 450.3(B) secondary protection and for sizing the secondary conductors.

5Per NEC 2017 450.11, which item must appear on the nameplate of a transformer rated 25 kVA and larger?

A.Impedance

B.The utility account number

C.The interrupting rating of the nearest circuit breaker

D.The soil thermal resistivity of the pad

Explanation: NEC 450.11 requires the nameplate to include manufacturer, rated kVA, frequency, primary and secondary voltage, and, for transformers 25 kVA and larger, impedance. Impedance is used for fault-current calculations and for deciding whether tanks can be paralleled. Other 450.11 items include required clearances and insulating-liquid data when they apply.

6A 150 kVA dry-type transformer is being installed indoors to feed a secondary line. Unless an Article 450 exception applies, NEC 2017 450.21(B) requires the transformer to be:

A.Installed in a transformer room of fire-resistant construction

B.Set on a wooden pallet with no clearance to combustibles

C.Installed in a bathroom so it is locked from the public

D.Hung from a tree so heat can rise freely

Explanation: NEC 450.21(B) requires dry-type transformers over 112.5 kVA installed indoors to be in a room of fire-resistant construction, unless a listed exception is met (for example Class 155 insulation with specified clearances, or a completely enclosed ventilated unit). A 150 kVA indoor dry-type is over that 112.5 kVA threshold.

7Unless an Article 450 exception applies, oil-insulated transformers installed indoors shall be installed:

A.In a transformer vault complying with Part III of Article 450

B.Above a suspended ceiling with no enclosure

C.In any unrated closet next to combustible storage

D.On the roof without a weatherproof enclosure

Explanation: NEC 450.26 requires oil-insulated transformers installed indoors to be in a vault constructed to 450.41 through 450.48, except for the limited indoor exceptions in 450.26. The vault contains a liquid-fire and contains spilled oil. Dry-type rules in 450.21 do not authorize skipping a vault for an oil-filled indoor tank.

8NEC 2017 450.14 requires a transformer disconnecting means to be located in sight of the transformer unless:

A.The disconnect is lockable open and its location is field-marked on the transformer

B.The transformer is smaller than 500 kVA

C.The secondary voltage is 208Y/120 V

D.A ground rod is driven at the pad

Explanation: NEC 450.14 requires a disconnecting means either in sight of the transformer or lockable in accordance with 110.25, with the location field-marked on the transformer. The rule exists so a worker can isolate the tank before opening it. kVA, secondary voltage, and a ground rod do not replace that disconnect.

9NEC 2017 450.13 generally requires transformers to be readily accessible to qualified personnel. A dry-type transformer is permitted in a fire-resistant hollow space of a building, not permanently closed in, only if it is 1000 V or less and does not exceed:

A.10 kVA

B.25 kVA

C.50 kVA

D.112.5 kVA

Explanation: The 450.13 Exception permits dry-type transformers 1000 V or less, not exceeding 50 kVA, in fire-resistant hollow spaces that are not permanently closed in by the structure, and that still meet 450.9 ventilation and 450.21(A). A 112.5 kVA unit is the indoor-room threshold in 450.21, not the hollow-space limit.

10NEC 2017 450.9 requires transformer ventilation to be adequate to dispose of the full-load heat without creating a temperature rise that exceeds the rating. Ventilation openings shall not be located so as to:

A.Expose adjacent combustible material to the exhausted hot air

B.Face any outdoor wall

C.Be more than 6 inches above the floor

D.Be screened against birds

Explanation: NEC 450.9 requires openings arranged so the exhausted air does not expose adjacent combustible material to a fire hazard. The section also requires the manufacturer’s ventilation clearances to be kept. Screening against birds is good practice but is not the 450.9 combustible-exposure rule.

About the NV C-2E Transmission Lines Exam

The Nevada C-2E Lines to Transmit Electricity Contractor Examination is the official Nevada State Contractors Board trade or management examination administered by PSI Services LLC. The official exam has 40 scored questions. Passing is 70% (28 of 40 points) in 1.5 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.

Exam sponsor: PSI Services LLC (for the Nevada State Contractors Board). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Open Book computer-based multiple-choice. National Electrical Code, 2017 (allowed in center)

Time Limit

1.5 hours

Passing Score

70% (28 of 40 points)

Exam / Certification Fees

USD 95

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

PSI Services LLC (for the Nevada State Contractors Board): official exam information

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

15%

Transformers

Transformers (6 items)

12%

Electrical Knowledge

Electrical theory (5 items)

12%

Conductors

Conductors (5 items)

10%

Overhead Lines

Overhead secondary lines (4 items)

10%

Underground Lines

Underground secondary lines (4 items)

10%

Equipment and Safety

Equipment and safety (4 items)

8%

Grounding Methods

Grounding methods (3 items)

8%

Service Drops and Laterals

Service drops and laterals (3 items)

8%

Poles and Structures

Poles and structures (3 items)

8%

Electric Supply Stations

Electric supply stations (3 items)

Preparing for the NV C-2E Transmission Lines Exam

What You Need to Know

Passing score: 70% (28 of 40 points)
Assessment: Open Book computer-based multiple-choice. National Electrical Code, 2017 (allowed in center)
Time limit: 1.5 hours
Exam / certification fees: USD 95 Official sources

Using Our Practice Resources

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NV C-2E Transmission Lines: Suggested Study Strategy

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-2E Lines to Transmit Electricity Contractor Examination?

The official PSI examination has 40 scored questions. Passing is 70% (28 of 40 points) within 1.5 hours (Candidate Information Bulletin 270, updated 3/25/2026).

How much does the NV C-2E Transmission Lines 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-2E Transmission Lines 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.