Question 1

Power sources for Class 2 or Class 3 circuits may be derived from ________.

Accepted Answer

A)   A listed or labeled Class 2 or Class 3 power supply or transformer
B)   Any inherently limited power supply
C)   Any power supply having a maximum output of 100VA
D)   Any power supply 150V or lessE) All of the above
F) C) and D)

Question 2

A Power-limited Class 1 circuit may operate at a maximum of _________.

Accepted Answer

A)   600V, 1000VA
B)   30V, 1000VA
C)   150V, 1000VA
D)   30V, 100VAE) A) and D)
F) All of the above

Question 3

Multiple Class 2 or Class 3 power supplies can be wired in parallel with each other.

Accepted Answer

A) True 
 B)False  False

Question 4

Class 2 or Class 3 conductors may be installed within enclosures including electric light and power circuits provided _________.

Accepted Answer

A)   The Class 2 and Class 3 circuits are installed as Class 3 and they maintain ¼" separation
B)   They are installed as Class 1 circuits
C)   The Class 1 circuits are functionally associated and maintain ¼' separation
D)   All the aboveE) All of the above
F) B) and D) D

Question 5

Class 2 or Class 3 audio circuit conductors in accordance with section 640.9 of the NEC, __________ occupy the same cable or raceway with other Class 2 or Class 3 remote control or signaling circuits.

Accepted Answer

A)   Shall not be permitted to
B)   Shall
C)   Shall be permitted to
D)   MustE) A) and D)
F) All of the above

Question 6

Class 3 power supplies may operate up to a maximum of 1000VA.

Accepted Answer

A) True 
 B)False

Question 7

Class 1 circuits typically operate from greater voltage and current levels than those of Class 2 or 3 circuits.

Accepted Answer

A) True 
 B)False

Question 8

Signaling circuits include _________.

Accepted Answer

A)   Circuits that activate notification devices
B)   Circuits that signal other circuits
C)   Circuits that control other circuits
D)   Communication circuitsE) All of the above
F) C) and D)

Question 9

Class 2 or Class 3 conductors may be run in the same raceway with Class 1 circuits provided _________.

Accepted Answer

A)   They are functionally associated
B)   They are separated by a solid and firmly fixed barrier
C)   That there is a 2 inch separation between the conductors
D)   They are carrying less than 150VE) C) and D)
F) A) and C) B

Question 10

If an equipment failure were to introduce a direct life or fire hazard, the circuit must be reclassified as Class 1.

Accepted Answer

A) True 
 B)False

Question 11

Exterior run Class 2 and Class 3 circuits must maintain a minimum separation of _________ from Class 1 electric light and power circuits.

Accepted Answer

A)   ¼ inch
B)   1 inch
C)   2 inch
D)   6 inchE) B) and C)
F) A) and B)

Question 12

You have a Rigid PVC conduit (RNC), schedule 80, that is required to hold the following conductors; six -18AWG TFN, ten -18AWG XFF and four -16AWG XF.   Answer the questions below. 
Calculate the total diameter of the XF conductors.

Accepted Answer

The answer of You have a Rigid PVC conduit (RNC),...

Question 13

In elevators, power-limited circuits must be installed __________.

Accepted Answer

A)   To maintain a 2 inch separation form class 1 circuits
B)   Inside a rigid metal conduit or non-metallic conduit
C)   As class 1 wiring
D)   In a cable trayE) None of the above
F) All of the above

Question 14

Instrumentation tray cable can be used as a substitute for Class 3 wiring.

Accepted Answer

A) True 
 B)False

Question 15

You have a Rigid PVC conduit (RNC), schedule 80, that is required to hold the following conductors; six -18AWG TFN, ten -18AWG XFF and four -16AWG XF.   Answer the questions below. 
What size RNC is needed to accommodate the conductors?

Accepted Answer

The answer of You have a Rigid PVC conduit (RNC),...

Question 16

A power-limited Class 3 power supply must never exceed _________.

Accepted Answer

A)   30V, 100VA
B)   150V, 100VA
C)   300V, 100VA
D)   600V, 1000VAE) None of the above
F) A) and B)

Question 17

Class 1 circuits, that are not functionally associated, must be separated from power conductors by a solid and firmly fixed barrier.

Accepted Answer

A) True 
 B)False

Question 18

Coaxial cable connecting a video camera to a monitor is an example of integral wiring.

Accepted Answer

A) True 
 B)False

Question 19

The overcurrent protection device for a Class 1 circuits may be rated to _________.

Accepted Answer

A)   70% of the power supply rating
B)   100% of the power supply rating
C)   167% of the power supply rating
D)   200% of the power supply ratingE) C) and D)
F) All of the above

Question 20

You have a Rigid PVC conduit (RNC), schedule 80, that is required to hold the following conductors; six -18AWG TFN, ten -18AWG XFF and four -16AWG XF.   Answer the questions below. 
 ​ Calculate the total diameter of the XFF conductors.

Accepted Answer

The answer of You have a Rigid PVC conduit (RNC),...

Exam 8: Article 725 of the National Electrical Code; Classification of Circuits

Power sources for Class 2 or Class 3 circuits may be derived from ________.

Correct AnswerverifiedShow Answer

A Power-limited Class 1 circuit may operate at a maximum of _________.

Correct AnswerverifiedShow Answer

Multiple Class 2 or Class 3 power supplies can be wired in parallel with each other.

Correct AnswerverifiedFalse

Class 2 or Class 3 conductors may be installed within enclosures including electric light and power circuits provided _________.

Correct AnswerverifiedD

Class 2 or Class 3 audio circuit conductors in accordance with section 640.9 of the NEC, __________ occupy the same cable or raceway with other Class 2 or Class 3 remote control or signaling circuits.

Correct AnswerverifiedShow Answer

Class 3 power supplies may operate up to a maximum of 1000VA.

Correct AnswerverifiedShow Answer

Class 1 circuits typically operate from greater voltage and current levels than those of Class 2 or 3 circuits.

Correct AnswerverifiedShow Answer

Signaling circuits include _________.

Correct AnswerverifiedShow Answer

Class 2 or Class 3 conductors may be run in the same raceway with Class 1 circuits provided _________.

Correct AnswerverifiedB

If an equipment failure were to introduce a direct life or fire hazard, the circuit must be reclassified as Class 1.

Correct AnswerverifiedShow Answer

Exterior run Class 2 and Class 3 circuits must maintain a minimum separation of _________ from Class 1 electric light and power circuits.

Correct AnswerverifiedShow Answer

You have a Rigid PVC conduit (RNC), schedule 80, that is required to hold the following conductors; six -18AWG TFN, ten -18AWG XFF and four -16AWG XF. Answer the questions below. Calculate the total diameter of the XF conductors.

Correct AnswerverifiedShow Answer

In elevators, power-limited circuits must be installed __________.

Correct AnswerverifiedShow Answer

Instrumentation tray cable can be used as a substitute for Class 3 wiring.

Correct AnswerverifiedShow Answer

You have a Rigid PVC conduit (RNC), schedule 80, that is required to hold the following conductors; six -18AWG TFN, ten -18AWG XFF and four -16AWG XF. Answer the questions below. What size RNC is needed to accommodate the conductors?

Correct AnswerverifiedShow Answer

A power-limited Class 3 power supply must never exceed _________.

Correct AnswerverifiedShow Answer

Class 1 circuits, that are not functionally associated, must be separated from power conductors by a solid and firmly fixed barrier.

Correct AnswerverifiedShow Answer

Coaxial cable connecting a video camera to a monitor is an example of integral wiring.

Correct AnswerverifiedShow Answer

The overcurrent protection device for a Class 1 circuits may be rated to _________.

Correct AnswerverifiedShow Answer

You have a Rigid PVC conduit (RNC), schedule 80, that is required to hold the following conductors; six -18AWG TFN, ten -18AWG XFF and four -16AWG XF. Answer the questions below. ​ Calculate the total diameter of the XFF conductors.

Correct AnswerverifiedShow Answer

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B

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You have a Rigid PVC conduit (RNC), schedule 80, that is required to hold the following conductors; six -18AWG TFN, ten -18AWG XFF and four -16AWG XF. Answer the questions below. Calculate the total diameter of the XFF conductors.

Correct Answer
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