Exam 23: Special-Purpose Outletselectric Heating, Air Conditioning

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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.

Free

(Essay)

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Question 1

Correct Answer:

Verified

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.

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

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(Multiple Choice)

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Question 2

Correct Answer:

Verified

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.

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(True/False)

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Question 3

Correct Answer:

Verified

False

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

(Multiple Choice)

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Question 4

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

(Short Answer)

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Question 5

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

(Multiple Choice)

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Question 6

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

(Multiple Choice)

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Question 7

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

(Essay)

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Question 8

Baseboard heating units can be controlled by ____.

(Multiple Choice)

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Question 9

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

(Short Answer)

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Question 10

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?

(Short Answer)

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Question 11

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

(Multiple Choice)

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Question 12

NEC 422.12 on central heating equipment requires that ____.

(Multiple Choice)

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Question 13

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

(Essay)

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Question 14

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

(Multiple Choice)

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Question 15

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

(Essay)

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Question 16

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

(Multiple Choice)

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(75)

Question 17

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

(Multiple Choice)

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(80)

Question 18

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

(Multiple Choice)

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(91)

Question 19

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

(Essay)

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(73)

Question 20

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Exam 23: Special-Purpose Outletselectric Heating, Air Conditioning

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.

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

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.

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

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

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

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

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

Baseboard heating units can be controlled by ____.

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

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?

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

NEC 422.12 on central heating equipment requires that ____.

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

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

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

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

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

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

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

General Information for Electrical Installations

Electrical Symbols and Outlets

Determining the Required Number of Branch Circuits, Lighting Outlets, Receptacle Outlets

Conductor Sizes and Types, Wiring Methods, Wire Connections, Voltage Drop, Neutral Conductor Sizing for Services

Conductor Identification, Switch Control of Lighting Circuits, Bondinggrounding of Wiring Devices, Induction Heating

Ground-Fault Circuit Interrupters, Arc-Fault Circuit Interrupters, Surge Protective Devices, Immersion Detection Circuit Interrupters, and Appliance Leakage Current Interrupters

Luminaires, Ballasts, and Lamps

Lighting Branch Circuit for the Front Bedroom

Lighting Branch Circuit for the Master Bedroom

Lighting Branch Circuitbathrooms, Hallway

Lighting Branch Circuit-Front Entry, Porch, Post-Light, Underground Wiring

Lighting Branch Circuit and Small-Appliance Circuits for the Kitchen

Lighting Branch Circuit for the Living Room

Lighting Branch Circuit for the Studybedroom

Dryer Outlet, Lighting and Receptacle Circuits for the Laundry, Powder Room, Rear Entry Hall, and Attic

Branch Circuits for the Garage and Outdoors

Recreation Room

Lighting Branch Circuit, Receptacle Circuits for Workshop

Special-Purpose Outletswater Pump, Water Heater

Special-Purpose Outlets for Ranges, Counter-Mounted Cooking Unit G, and Wall-Mounted Oven F

Special-Purpose Outletsfood Waste Disposer, Dishwasher

Special-Purpose Outlets for the Bathroom Ceiling Heatventlights K J, the Attic Fan L, and the Hydromassage Tub a

Gas and Oil Central Heating Systems

Television, Telephone, and Low-Voltage Signal Systems

Smoke, Heat, and Carbon Monoxide Alarms, and Security Systems

Service-Entrance Equipment

Overcurrent Protectionfuses and Circuit Breakers

Service-Entrance Calculations

Swimming Pools, Spas, Hot Tubs, and Hydromassage Baths

Wiring for the Future: Home Automation Systems

Standby Power Systems

Residential Utility-Interactive Photovoltaic Systems

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