Technician Exam Practice Questions And

ETCP Portable Power Distribution Technician Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the standard voltage for most portable power distribution

systems in North America?

A. 120V

B. 208V

C. 220V

D. 240V

Rationale: 220V is commonly used for higher-load portable power

distribution setups.

• Which type of connector is typically used for a 3-phase 208V

connection?

A. NEMA 5-15 1 / 4

• Camlock
• Edison Twist-Lock

D. IEC C13

Rationale: Camlock connectors are standard for high-amperage, 3-

phase power distribution.

• What color is used to identify the ground conductor in the US?
• White
• Red
• Green
• Black

Rationale: The National Electrical Code specifies green (or bare) for

grounding conductors.

• When performing a pre-use inspection of a portable distribution

system, which is the most critical?

• Labeling
• Integrity of cables and connectors
• Brand of equipment
• Length of cable

Rationale: Damaged cables or connectors can lead to electrocution

or equipment failure.

• What is the main purpose of a circuit breaker in a portable distribution

system?

• To measure voltage 2 / 4

• To protect against overload and short circuits
• To increase current
• To convert AC to DC

Rationale: Circuit breakers interrupt power when unsafe conditions

occur.

• Which class of fire extinguisher is suitable for electrical fires?
• Class A
• Class B
• Class C
• Class D

Rationale: Class C extinguishers are rated for energized electrical

equipment.

• What is the primary function of a neutral conductor?
• Carrying current to ground
• Providing a return path for current
• Protecting the system
• Acting as a switch

Rationale: The neutral completes the circuit and allows current to

return to the source safely.

• Which device is commonly used to step down voltage for distribution

in portable power systems?

• Generator
• Transformer 3 / 4

• Breaker
• Conductor

Rationale: Transformers adjust voltage levels for safe distribution to

equipment.

• What does the term “three-phase” mean?
• Power from three batteries
• Three alternating currents, each 120 degrees out of phase
• Three single-phase circuits combined
• Three times the voltage of single-phase

Rationale: Three-phase power provides consistent, balanced

electrical flow for high-load applications.

• Which NEMA connector is commonly rated for 20A, 120V?

A. NEMA L5-30

B. NEMA 5-20

C. NEMA L6-20

D. NEMA 14-50

Rationale: The NEMA 5-20 is a standard 120V 20-ampere connector.

• What is the typical duty cycle for a portable generator used in

entertainment applications?

A. 25%

B. 50%

C. 100%

• 75%
• / 4