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 1

Answer

Class 3

Answer

Class 4

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

150 volts

Answer

300 volts

Answer

1000 volts

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

Fire alarm wiring

Answer

Communications wiring

Answer

Telephone cables

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

CM

Answer

CMP

Answer

CMG

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

Require a larger minimum conductor size

Answer

Must always be installed in conduit

Answer

Have no power limitations whatsoever

Question 6

Per NEC Article 725, Class 1 circuit conductors must be protected by overcurrent protection in accordance with:

Accepted Answer

NEC 725.43 based on conductor ampacity

Answer

Article 240 with a maximum of 7 amperes

Answer

GFCI devices rated for low-voltage circuits

Answer

AFCI devices listed for Class 1 use

Question 7

Which of the following is a common example of a Class 2 low-voltage circuit typically installed by journeyman electricians?

Accepted Answer

Residential doorbell and chime systems

Answer

Fire alarm initiating device circuits

Answer

Emergency lighting branch circuits

Answer

120-volt landscape lighting circuits