Exam Questions And Correct Answers

Limited Energy Technician Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the maximum voltage permitted for a Class 2 circuit under

normal conditions?

• 60 volts
• 30 volts
• 50 volts
• 100 volts

Rationale: Class 2 circuits are limited to 30 volts maximum under

normal operating conditions to reduce shock hazards.

• Which NEC Article covers Fire Alarm Systems?
• Article 725
• Article 760
• Article 800 1 / 4

• Article 820

Rationale: Fire alarm systems are governed by NEC Article 760.

• What is the primary purpose of a Class 1 circuit?
• Data transmission
• Audio communications
• Remote control and signaling
• Computer networking

Rationale: Class 1 circuits are designed for remote control and

signaling purposes where higher voltage or power may be required.

• Which conductor color is typically used for negative polarity in DC

control circuits?

• White
• Green
• Blue
• Red

Rationale: Blue is commonly used to indicate the negative or grounded

side in DC control wiring.

• What is the minimum bending radius for a communication cable

according to manufacturer’s instructions?

• 2 times cable diameter
• 4 times cable diameter
• As specified by the manufacturer
• 10 times cable diameter 2 / 4

Rationale: The NEC defers to manufacturer instructions for bending

radius limits to prevent cable damage.

• What type of cable is rated for plenum use?
• CM

B. CMR

C. CMP

D. CAT6

Rationale: CMP-rated cable is designed for plenum spaces and meets

stringent fire-resistance requirements.

• Which NEC Article governs communication circuits?

A. 725

B. 760

C. 800

D. 805

Rationale: Article 800 of the NEC covers communication circuits such

as telephone and data wiring.

• What type of wire insulation is required in a fire-rated cable system?
• Polyethylene
• Fire-resistant insulation

C. PVC

• Nylon

Rationale: Fire-rated systems require insulation materials designed to

resist flame propagation. 3 / 4

• Which color must never be used for an ungrounded conductor?
• Red
• Blue
• Green
• Black

Rationale: Green is reserved exclusively for grounding conductors.

• In a low-voltage lighting system, transformers must be listed for

what type of use?

• Power distribution
• Low-voltage lighting
• Industrial control
• Communication

Rationale: Transformers must be listed specifically for low-voltage

lighting to ensure proper safety compliance.

• What is the maximum voltage permitted for Class 3 circuits?
• 24 volts
• 30 volts
• 100 volts
• 150 volts

Rationale: Class 3 circuits can operate up to 100 volts under normal

conditions.

• / 4