ETCP Certified Entertainment
Electrician Practice Exam 100
Questions And Correct Answers
(Verified Answers) Plus Rationales
2026 Q&A Instant Download Pdf
1. What is the standard voltage for stage lighting circuits in North America?
A. 24V
B. 120V
C. 240V
D. 480V
120V
Rationale: 120V is the standard voltage for most theatrical lighting circuits in
the United States and Canada.
2. What is the primary purpose of a grounding conductor in entertainment
electrical systems?
A. Carry normal load current
B. Increase circuit voltage
C. Provide a safe path for fault current
D. Balance phase loads
Provide a safe path for fault current
Rationale: The grounding conductor provides a safe path for fault current,
reducing the risk of shock and equipment damage.
3. Which NEC article specifically covers temporary installations for theatrical
lighting?
,A. 400
B. 520
C. 530
D. 600
520
Rationale: NEC Article 520 covers theaters, performance spaces, and similar
installations.
4. What device protects circuits from overcurrent conditions?
A. Transformer
B. Circuit breaker
C. Dimmer
D. Receptacle
Circuit breaker
Rationale: Circuit breakers automatically disconnect power when current
exceeds safe limits, protecting against overloads and short circuits.
5. In a three-phase system, what is the phase difference between each leg?
A. 90°
B. 120°
C. 180°
D. 360°
120°
Rationale: Three-phase power is separated by 120 degrees for balanced
power delivery.
6. What is the standard frequency of AC power in North America?
A. 50 Hz
B. 60 Hz
C. 100 Hz
D. 400 Hz
60 Hz
, Rationale: North America uses 60 Hz alternating current for power
distribution.
7. Which color code is used for grounding conductors in the U.S.?
A. Red
B. Blue
C. Green or bare
D. White
Green or bare
Rationale: Grounding conductors must be green or bare according to NEC
standards.
8. In DMX512 protocol, how many unique channels are available per
universe?
A. 128
B. 512
C. 1024
D. 256
512
Rationale: DMX512 provides 512 discrete channels per universe.
9. What is the primary function of a transformer?
A. Store energy
B. Change voltage levels
C. Measure resistance
D. Convert frequency
Change voltage levels
Rationale: Transformers step voltage up or down for proper distribution.
10. What is the maximum load typically allowed on a 20A, 120V circuit for
continuous use?
A. 20A
B. 18A
Electrician Practice Exam 100
Questions And Correct Answers
(Verified Answers) Plus Rationales
2026 Q&A Instant Download Pdf
1. What is the standard voltage for stage lighting circuits in North America?
A. 24V
B. 120V
C. 240V
D. 480V
120V
Rationale: 120V is the standard voltage for most theatrical lighting circuits in
the United States and Canada.
2. What is the primary purpose of a grounding conductor in entertainment
electrical systems?
A. Carry normal load current
B. Increase circuit voltage
C. Provide a safe path for fault current
D. Balance phase loads
Provide a safe path for fault current
Rationale: The grounding conductor provides a safe path for fault current,
reducing the risk of shock and equipment damage.
3. Which NEC article specifically covers temporary installations for theatrical
lighting?
,A. 400
B. 520
C. 530
D. 600
520
Rationale: NEC Article 520 covers theaters, performance spaces, and similar
installations.
4. What device protects circuits from overcurrent conditions?
A. Transformer
B. Circuit breaker
C. Dimmer
D. Receptacle
Circuit breaker
Rationale: Circuit breakers automatically disconnect power when current
exceeds safe limits, protecting against overloads and short circuits.
5. In a three-phase system, what is the phase difference between each leg?
A. 90°
B. 120°
C. 180°
D. 360°
120°
Rationale: Three-phase power is separated by 120 degrees for balanced
power delivery.
6. What is the standard frequency of AC power in North America?
A. 50 Hz
B. 60 Hz
C. 100 Hz
D. 400 Hz
60 Hz
, Rationale: North America uses 60 Hz alternating current for power
distribution.
7. Which color code is used for grounding conductors in the U.S.?
A. Red
B. Blue
C. Green or bare
D. White
Green or bare
Rationale: Grounding conductors must be green or bare according to NEC
standards.
8. In DMX512 protocol, how many unique channels are available per
universe?
A. 128
B. 512
C. 1024
D. 256
512
Rationale: DMX512 provides 512 discrete channels per universe.
9. What is the primary function of a transformer?
A. Store energy
B. Change voltage levels
C. Measure resistance
D. Convert frequency
Change voltage levels
Rationale: Transformers step voltage up or down for proper distribution.
10. What is the maximum load typically allowed on a 20A, 120V circuit for
continuous use?
A. 20A
B. 18A
