Question 1

NEC 422.12 on central heating equipment requires that ____.

Accepted Answer

A)   electric furnace overcurrent protection be provided by fuses only
B)   central heating equipment be provided by a separate branch circuit
C)   electric furnaces be grounded according to the requirements of Article 250
D)   a disconnecting means be provided for central heating equipmentE) A) and B)
F) A) and C)

Question 2

The total load of an air conditioner shall not exceed ____ percent of the rating of a branch circuit that also supplies lighting.

Accepted Answer

A)   50
B)   75
C)   80
D)   125E) B) and D)
F) A) and D)

Question 3

Match the following abbreviations used for current values associated with HVAC (heating, ventilating, and air-conditioning)  equipment with their meanings.
-BCSC

Accepted Answer

A)  Minimum requirement to determine the conductor size and switch rating
B)  Value used to select branch circuit conductors and disconnect
C)  Maximum current a motor compressor can draw before damage occursD) All of the above
E) B) and C)

Question 4

The maximum current and voltage rating permitted by Code for a cord-and-plug connected air-conditioner is ______________________________ at 250 volts.

Accepted Answer

The answer of The maximum current and voltage rating permitted...

Question 5

The total load of an air conditioner shall not exceed ____ percent of the rating of a separate branch circuit.

Accepted Answer

A)   50
B)   75
C)   80
D)   125E) B) and C)
F) None of the above

Question 6

Explain how NEC 422.11 affects selection of branch circuit conductors for appliances, including electric furnaces.

Accepted Answer

The branch-circuit overcurrent...

Question 7

The article that covers cord-and-plug connected air conditioners is ____.

Accepted Answer

A)   Article 210
B)   Article 422
C)   Article 430
D)   Article 440E) All of the above
F) A) and B)

Question 8

The disconnect for motor-driven appliances having a motor of greater than ____ must be within sight of the appliance.

Accepted Answer

A)   1/8 hp
B)   1/4 hp
C)   1/2 hp
D)   3/4 hpE) B) and C)
F) All of the above

Question 9

When making a calculation for sizing a service or feeder, you must include 125 percent of the rating of the total connected fixed space heating load.

Accepted Answer

A) True 
 B)False  False

Question 10

Although two-wire cables, such as Type NM and Type AC, contain one black and one white insulated conductor, they are frequently used in residential wiring to supply 240-volt loads. Explain how this can be permitted.

Accepted Answer

NEC 200.7(C) allows a white wire to be used as an ungrounded (hot) conductor so long as it is permanently reidentified at all points where connections are made or where it is visible and accessible. Black paint or tape are normally used to mark a white conductor.

Question 11

Baseboard heating units can be controlled by ____.

Accepted Answer

A)   line-voltage thermostats
B)   low-voltage thermostats
C)   on-off switches
D)   both a and bE) A) and B)
F) A) and C)

Question 12

Explain what the NEC requires for a white wire used as an ungrounded (hot) conductor.

Accepted Answer

It must be permanently reident...

Question 13

For ease of identification, NEC 424.35 requires that leads on heating cables be color-coded. Match the voltages below with the required colors.
-480 volts

Accepted Answer

A)  red
B)  blue
C)  orange
D)  yellow
E)  brownF) D) and E)
G) B) and E)

Question 14

When Class 2 control wiring is used with central heating and air-conditioning equipment, what is the Code section that prohibits running Class 2 wiring in the same raceway as power conductors?

Accepted Answer

The answer of When Class 2 control wiring is used...

Question 15

The NEC permits flexible cords to be used to supply appliances where ____.

Accepted Answer

A)   the appliance is designed to permit ready removal for maintenance and repair
B)   the appliance weighs less than 100 pounds
C)   the appliance is identified for flexible cord connection
D)   both a and cE) None of the above
F) A) and B) D

Question 16

The air-conditioner load shall not exceed ____________________ percent of the branch-circuit ampacity if other loads are also served.

Accepted Answer

The answer of The air-conditioner load shall not exceed ____________________...

Question 17

Explain the reason that baseboard heating manufacturers do not permit their baseboard heaters to be installed below wall receptacle outlets.

Accepted Answer

A possible fire and shock haza...

Question 18

List at least three advantages of electric heating as compared to other types of residential heating systems.

Accepted Answer

Advantages of using electricl heating in...

Question 19

For ease of identification, NEC 424.35 requires that leads on heating cables be color-coded. Match the voltages below with the required colors.
-240 volts

Accepted Answer

A)  red
B)  blue
C)  orange
D)  yellow
E)  brownF) A) and E)
G) B) and D)

Question 20

For ease of identification, NEC 424.35 requires that leads on heating cables be color-coded. Match the voltages below with the required colors.
-120 volts

Accepted Answer

A)  red
B)  blue
C)  orange
D)  yellow
E)  brownF) None of the above
G) C) and D)

Exam 23: Special-Purpose Outletselectric Heating, Air Conditioning

NEC 422.12 on central heating equipment requires that ____.

Correct AnswerverifiedShow Answer

The total load of an air conditioner shall not exceed ____ percent of the rating of a branch circuit that also supplies lighting.

Correct AnswerverifiedShow Answer

Match the following abbreviations used for current values associated with HVAC (heating, ventilating, and air-conditioning) equipment with their meanings. -BCSC

Correct AnswerverifiedShow Answer

The maximum current and voltage rating permitted by Code for a cord-and-plug connected air-conditioner is ______________________________ at 250 volts.

Correct AnswerverifiedShow Answer

The total load of an air conditioner shall not exceed ____ percent of the rating of a separate branch circuit.

Correct AnswerverifiedShow Answer

Explain how NEC 422.11 affects selection of branch circuit conductors for appliances, including electric furnaces.

Correct AnswerverifiedThe branch-circuit overcurrent...View AnswerShow Answer

The article that covers cord-and-plug connected air conditioners is ____.

Correct AnswerverifiedShow Answer

The disconnect for motor-driven appliances having a motor of greater than ____ must be within sight of the appliance.

Correct AnswerverifiedShow Answer

When making a calculation for sizing a service or feeder, you must include 125 percent of the rating of the total connected fixed space heating load.

Correct AnswerverifiedFalse

Although two-wire cables, such as Type NM and Type AC, contain one black and one white insulated conductor, they are frequently used in residential wiring to supply 240-volt loads. Explain how this can be permitted.

Correct AnswerverifiedNEC 200.7(C) allows a white wire to be used as an ungrounded (hot) conductor so long as it is permanently reidentified at all points where connections are made or where it is visible and accessible. Black paint or tape are normally used to mark a white conductor.

Baseboard heating units can be controlled by ____.

Correct AnswerverifiedShow Answer

Explain what the NEC requires for a white wire used as an ungrounded (hot) conductor.

Correct AnswerverifiedIt must be permanently reident...View AnswerShow Answer

For ease of identification, NEC 424.35 requires that leads on heating cables be color-coded. Match the voltages below with the required colors. -480 volts

Correct AnswerverifiedShow Answer

When Class 2 control wiring is used with central heating and air-conditioning equipment, what is the Code section that prohibits running Class 2 wiring in the same raceway as power conductors?

Correct AnswerverifiedShow Answer

The NEC permits flexible cords to be used to supply appliances where ____.

Correct AnswerverifiedD

The air-conditioner load shall not exceed ____________________ percent of the branch-circuit ampacity if other loads are also served.

Correct AnswerverifiedShow Answer

Explain the reason that baseboard heating manufacturers do not permit their baseboard heaters to be installed below wall receptacle outlets.

Correct AnswerverifiedA possible fire and shock haza...View AnswerShow Answer

List at least three advantages of electric heating as compared to other types of residential heating systems.

Correct AnswerverifiedAdvantages of using electricl heating in...View AnswerShow Answer

For ease of identification, NEC 424.35 requires that leads on heating cables be color-coded. Match the voltages below with the required colors. -240 volts

Correct AnswerverifiedShow Answer

For ease of identification, NEC 424.35 requires that leads on heating cables be color-coded. Match the voltages below with the required colors. -120 volts

Correct AnswerverifiedShow Answer

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The branch-circuit overcurrent...
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False

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NEC 200.7(C) allows a white wire to be used as an ungrounded (hot) conductor so long as it is permanently reidentified at all points where connections are made or where it is visible and accessible. Black paint or tape are normally used to mark a white conductor.

Correct Answer
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It must be permanently reident...
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D

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A possible fire and shock haza...
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Advantages of using electricl heating in...
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