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100+ Free SC Electrician Practice Questions

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2026 Statistics

Key Facts: SC Electrician Exam

80 Q

Official Exam Questions

PSI SC Commercial Contractor CIB updated 5/15/2025

70%

Passing Score (56 of 80)

PSI SC Commercial Contractor CIB updated 5/15/2025

5 hours

Time Allowed

PSI SC Commercial Contractor CIB updated 5/15/2025

USD 75

PSI Exam Fee

PSI SC Commercial Contractor CIB updated 5/15/2025

Open Book

Book Policy

PSI SC Commercial Contractor CIB updated 5/15/2025

South Carolina Electrician Contractor Examination is the official CLB/PSI open-book exam: 80 questions, 70% (56 of 80), 5 hours, USD 75 (bulletin updated 5/15/2025). Official delivery is English.

Sample SC Electrician Practice Questions

Try these sample questions to test your SC Electrician exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A balanced 208-volt, three-phase lighting panel on a Charleston commercial job draws 48 amperes at a lagging power factor of 0.82. Using √3 = 1.732, what is the real power of this load?
A.17.3 kW
B.20.0 kW
C.8.2 kW
D.14.2 kW
Explanation: Three-phase real power is P = 1.732 × V × I × PF. Substituting gives 1.732 × 208 × 48 × 0.82 = 14,180 W, or 14.2 kW. Apparent power without the power factor is 17.3 kVA and is not the real-power answer.
2A 120-volt, single-phase, 2-wire branch circuit supplies an 18-ampere load. The one-way conductor length is 85 feet of 12 AWG copper (K = 12.9, area = 6,530 CM). What is the calculated voltage drop?
A.3.02 volts
B.5.23 volts
C.6.05 volts
D.9.94 volts
Explanation: Single-phase voltage drop is VD = (2 × K × I × L) / CM. Substituting gives (2 × 12.9 × 18 × 85) / 6,530 = 39,474 / 6,530 = 6.05 V. That is about 5.0 percent of 120 V, above the NEC 210.19(A) Informational Note recommendation of 3 percent on a branch circuit.
3A purely resistive 240-volt strip heater installed in a Columbia shop has a measured resistance of 20 ohms. What current does the heater draw, and what is its power?
A.8 A and 1,920 W
B.10 A and 2,400 W
C.12 A and 2,880 W
D.16 A and 3,840 W
Explanation: Ohm's law gives I = V / R = 240 / 20 = 12 A. Power is P = V × I = 240 × 12 = 2,880 W, which also equals V² / R = 57,600 / 20 = 2,880 W. The American Electricians' Handbook treats this resistive case as the starting point for AC power calculations.
4A single-phase dry-type transformer serving a Greenville tenant space has a 480-volt primary and a 208-volt secondary. If the primary current is 45 amperes, what is the secondary current? Ignore losses.
A.19.5 A
B.45 A
C.90 A
D.104 A
Explanation: Transformer ampere-turns balance means I_s = I_p × (V_p / V_s). Substituting gives 45 × (480 / 208) = 104 A. The secondary current rises in the same ratio that voltage steps down.
5What is the peak (zero-to-peak) value of a 208-volt RMS sinusoidal line-to-line voltage? Use √2 = 1.414.
A.147 V
B.187 V
C.208 V
D.294 V
Explanation: For a sine wave, V_peak = V_RMS × √2. Multiplying 208 × 1.414 gives 294 V. The 208-volt name is an RMS value, not the peak of the waveform.
6A 120-volt, 60 Hz series circuit contains 8 ohms of resistance, 12 ohms of inductive reactance, and 6 ohms of capacitive reactance. What is the circuit current?
A.8.6 A
B.10.0 A
C.12.0 A
D.15.0 A
Explanation: Net reactance is XL − XC = 12 − 6 = 6 Ω. Impedance is Z = √(R² + X²) = √(8² + 6²) = 10 Ω. Current is I = V / Z = 120 / 10 = 12.0 A.
7A three-phase motor load on a Rock Hill feeder measures 36 kW of real power and 48 kVA of apparent power. What is the power factor, and what is the reactive power?
A.0.75 lagging and 12.0 kVAR
B.1.33 leading and 31.7 kVAR
C.0.80 lagging and 27.0 kVAR
D.0.75 lagging and 31.7 kVAR
Explanation: Power factor is P / S = 36 / 48 = 0.75. Reactive power is Q = √(S² − P²) = √(2,304 − 1,296) = √1,008 = 31.7 kVAR. A motor load is inductive, so the power factor is lagging.
8A 25-horsepower, 480-volt, three-phase motor is 88 percent efficient and operates at a 0.90 lagging power factor. Using 746 W/hp and √3 = 1.732, what line current does the motor draw?
A.34.0 A
B.49.1 A
C.24.9 A
D.28.3 A
Explanation: Output power is 25 × 746 = 18,650 W. Input power is 18,650 / 0.88 = 21,193 W. Line current is I = Pin / (1.732 × V × PF) = 21,193 / (1.732 × 480 × 0.90) = 28.3 A. NEC Table 430.250 full-load current is used for conductor sizing, not this nameplate-style input-current calculation.
9A 480-volt, three-phase feeder carries 65 amperes for 220 feet on 2 AWG copper. Use K = 12.9, √3 = 1.732, and a circular-mil area of 66,360 CM. What is the calculated voltage drop?
A.4.82 volts
B.5.56 volts
C.7.91 volts
D.2.78 volts
Explanation: Three-phase voltage drop is VD = (1.732 × K × I × L) / CM. Substituting gives (1.732 × 12.9 × 65 × 220) / 66,360 = 319,502 / 66,360 = 4.82 V, about 1.0 percent of 480 V.
10Two 24-ohm resistors are connected in parallel, and that combination is in series with an 8-ohm resistor. The circuit is supplied at 120 volts. What current flows through each 24-ohm resistor?
A.3.0 A
B.5.0 A
C.6.0 A
D.2.0 A
Explanation: The parallel pair equals 12 ohms. Total resistance is 12 + 8 = 20 ohms, so the source current is 120 / 20 = 6.0 A. Voltage across the parallel pair is 6.0 × 12 = 72 V, and each 24-ohm resistor then draws 72 / 24 = 3.0 A.

About the SC Electrician Exam

The South Carolina Electrician Contractor Examination is the official CLB classification examination administered by PSI. The official exam has 80 scored questions. Passing is 70% (56 of 80) in 5 hours. The examination is open book. PSI lists USD 75 (South Carolina Commercial Contractor Candidate Information Bulletin updated 5/15/2025). SC Electrician-Commercial Contractor candidates may take this state-specific examination or the NASCLA Accredited Examination Trade Examination for Electrical Contractors. This bank covers the South Carolina electrician examination only. All commercial general and mechanical contractor candidates must pass the Business Management and Law for Commercial Contractor Examination in addition to this technical examination. LLR charges a separate USD 350 license application fee. This bank is an English-language MCQ study adaptation. It does not replace required trade experience, board approval, financial statements or bonds, or the official examination.

Assessment

Open-book computer-based multiple-choice. Allowed references are listed in the South Carolina Commercial Contractor Candidate Information Bulletin updated 5/15/2025.

Time Limit

5 hours

Passing Score

70% (56 of 80)

Exam Fee

USD 75 (PSI Services LLC (for the South Carolina Contractor's Licensing Board))

SC Electrician Exam Content Outline

11%

General Electrical Knowledge

General Electrical Knowledge (9 items)

11%

Service, Feeders, and Branch Circuits

Service, Feeders, and Branch Circuits (9 items)

11%

Grounding and Bonding

Grounding and Bonding (9 items)

11%

Conductors and Cables

Conductors and Cables (9 items)

11%

Raceways and Boxes

Raceways and Boxes (9 items)

3%

Special Occupancies and Equipment

Special Occupancies and Equipment (2 items)

9%

Electrical Power

Electrical Power (7 items)

9%

Motors

Motors (7 items)

3%

Low Voltage

Low Voltage (2 items)

6%

Lighting

Lighting (5 items)

3%

Illuminated Signs

Illuminated Signs (2 items)

2%

Fire Detection and Alarm Systems

Fire Detection and Alarm Systems (2 items)

10%

Safety Information

Safety Information (8 items)

How to Pass the SC Electrician Exam

What You Need to Know

  • Passing score: 70% (56 of 80)
  • Assessment: Open-book computer-based multiple-choice. Allowed references are listed in the South Carolina Commercial Contractor Candidate Information Bulletin updated 5/15/2025.
  • Time limit: 5 hours
  • Exam fee: USD 75

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

SC Electrician Study Tips from Top Performers

1Distribute study time to the official PSI content outline (bulletin updated 5/15/2025)
2Use only the PSI-listed references for this classification
3Temporary tabs such as Post-it notes are prohibited in the PSI center
4This bank is an English-language MCQ study aid, not an official PSI form

Frequently Asked Questions

How many questions are on the South Carolina Electrician Contractor Examination?

The official PSI examination has 80 scored questions. Passing is 70% (56 of 80) within 5 hours (South Carolina Commercial Contractor Candidate Information Bulletin updated 5/15/2025).

How much does the SC Electrician exam cost?

PSI lists USD 75 for this examination. The South Carolina Contractor's Licensing Board charges a separate USD 350 license application fee.

Is the SC Electrician exam open book?

Yes. PSI lists the commercial contractor examinations as open book. Candidates may bring the PSI-listed references for this classification. Temporary tabs such as Post-it notes are prohibited.

Can I take the NASCLA electrical examination instead?

Yes. SC Electrician-Commercial Contractor candidates may take either this South Carolina electrician examination or the NASCLA Accredited Examination Trade Examination for Electrical Contractors. This bank is a study adaptation of the South Carolina electrician examination only.