Journeyman Electrician’s Exam Journeyman Electrician's Low Voltage Systems

Question 1

According to NEC Article 725, which class of circuit is characterized by inherently limited power output, making it safe due to low energy levels?

Accepted Answer

Class 2

Answer

Class 2 circuits are defined by their limited power output, making them inherently safe with minimal fire and shock hazards per NEC Article 725.

Question 2

What is the maximum voltage permitted for a Class 1 remote-control or signaling circuit per NEC Article 725?

Accepted Answer

600 volts

Answer

NEC 725.41 limits Class 1 circuits to 600 volts, placing them in the same general voltage range as standard power circuits.

Question 3

Under NEC Article 725, Class 2 and Class 3 conductors shall NOT be placed in the same cable, enclosure, or raceway as which of the following?

Accepted Answer

Class 1 circuit conductors

Answer

Class 2 and Class 3 conductors must be separated from Class 1 circuits because Class 1 operates at higher power levels that could damage or compromise low-voltage wiring.

Question 4

Which cable designation is listed under NEC Article 725 for Class 2 circuits in a general (non-plenum, non-riser) installation?

Accepted Answer

CL2

Answer

CL2 is the listed cable type for Class 2 circuit applications in general (non-plenum, non-riser) installations per NEC Article 725.

Question 5

A Class 3 circuit differs from a Class 2 circuit primarily because Class 3 circuits:

Accepted Answer

Allow higher voltages but with limited current output

Answer

Class 3 circuits allow higher voltages than Class 2 (up to 150V) while still limiting current output, making them suitable for applications requiring voltages above 30V.

Journeyman Electrician’s Exam Practice Test

Journeyman Electrician’s Exam Practice Test

Journeyman Electrician’s Exam Journeyman Electrician's Low Voltage Systems