Chicago Electrical Exam

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Questions: 123 | Attempts: 2,102 | Updated: Feb 24, 2023

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Chicago Electrical Contractor Prep-Exam

Questions and Answers

1.

A motor draws 165 amps at a voltage of 460 with a feeder ft. length of 190. The copper wire (75 degree C) size desired is #2/0, what would the voltage drop be?
- A.
  
  5.7
- B.
  
  6.5
- C.
  
  4.4
Correct Answer
A. 5.7

Explanation
The voltage drop in a circuit can be calculated using the formula V = I * R, where V is the voltage drop, I is the current, and R is the resistance. In this case, the current is given as 165 amps and the resistance can be calculated using the formula R = (ρ * L) / A, where ρ is the resistivity of the wire, L is the length of the wire, and A is the cross-sectional area of the wire. Since the wire size desired is #2/0, we can look up the resistivity and cross-sectional area in a table. Plugging in the values, we can calculate the resistance and then use it to find the voltage drop. The result is 5.7 volts.

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2.

A motor draws 83 amps at a voltage of 460 with a feeder ft. length of 190. The copper wire (75 degree C) size desired is #3, what would the voltage drop be?"
- A.
  
  5.9
- B.
  
  7.2
- C.
  
  8.0
Correct Answer
B. 7.2

Explanation
The voltage drop can be calculated using the formula VD = (2 x K x I x L) / CM, where VD is the voltage drop, K is the resistance constant, I is the current, L is the length of the wire, and CM is the circular mils of the wire. Since the desired wire size is #3, which has a CM value of 52640, and the current is 83 amps, the voltage drop would be 7.2 volts.

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1
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3.

A motor draws 21amps at a voltage of 230 with a feeder ft. length of 160. The copper wire (75 degree C) size desired is #10, Which minimum size copper wire is permissible by code to use?"
- A.
  
  #10
- B.
  
  #8
- C.
  
  #6
Correct Answer
B. #8

Explanation
According to electrical code regulations, the minimum size copper wire permissible for a motor that draws 21 amps at 230 volts with a 160 ft. feeder length is #8. This wire size is determined by considering factors such as the current draw, voltage, and length of the feeder, as well as the temperature rating of the wire. The #8 wire is able to safely handle the current and voltage requirements while also accounting for any potential voltage drop over the length of the feeder.

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4.

A motor draws 32 amps at a voltage of 230 with a feeder ft. length of 150. The copper wire (75 degree C) size desired is #8, Which minimum size copper wire is permissible by code to use?"
- A.
  
  #8
- B.
  
  #6
- C.
  
  #4
Correct Answer
B. #6

Explanation
The minimum size copper wire permissible by code to use in this scenario is #6. This is because the motor draws 32 amps, and according to code regulations, the wire size must be able to handle the current without overheating. The #6 wire is capable of carrying the required current safely, while the #8 wire would not be sufficient. The #4 wire, on the other hand, is larger than necessary for this particular situation.

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2
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5.

A motor draws 85 amps at a voltage of 230 with a feeder ft. length of 160. The copper wire (75 degree C) size desired is #3, Which minimum size copper wire is permissible by code to use?
- A.
  
  3
- B.
  
  2
- C.
  
  1
Correct Answer
A. 3

Explanation
The correct answer is 3 because according to the given information, the motor draws 85 amps at a voltage of 230 with a feeder ft. length of 160. The desired copper wire size is #3. The National Electrical Code specifies that the minimum size of copper wire to be used should be based on the ampacity requirements, and in this case, a #3 copper wire is sufficient to handle the 85 amp load.

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6.

A motor draws 21 amps at a voltage of 460 with a feeder ft. length of 190. The copper wire (75 degree C) size desired is #10, Which minimum size copper wire is permissible by code to use?
- A.
  
  #10
- B.
  
  #8
- C.
  
  #6
Correct Answer
A. #10

Explanation
The given question asks for the minimum permissible size of copper wire to use for a motor that draws 21 amps at a voltage of 460 with a feeder ft. length of 190. The desired wire size is #10, so the minimum permissible size would also be #10. Therefore, the correct answer is #10.

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7.

A motor draws 47 amps at a voltage of 460 with a feeder ft. length of 190. The copper wire (75 degree C) size desired is #8, Which minimum size copper wire is permissible by code to use?
- A.
  
  #8
- B.
  
  #6
- C.
  
  #4
Correct Answer
A. #8

Explanation
The given information states that the motor draws 47 amps at a voltage of 460, with a feeder ft. length of 190. The desired copper wire size is #8. According to the code, the minimum size copper wire permissible to use is #8. Therefore, the correct answer is #8.

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8.

A motor draws 165 amps at a voltage of 460 with a feeder ft. length of 190. The copper wire (75 degree C) size desired is #2/0, Which minimum size copper wire is permissible by code to use?
- A.
  
  1/0
- B.
  
  2/0
- C.
  
  3/0
Correct Answer
B. 2/0

Explanation
The motor draws 165 amps at a voltage of 460, and the desired copper wire size is #2/0. According to the code, the minimum size copper wire permissible to use is 2/0.

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9.

A motor draws 83 amps at a voltage of 460 with a feeder ft. length of 190. The copper wire (75 degree C) size desired is #3, Which minimum size copper wire is permissible by code to use?
- A.
  
  3
- B.
  
  2
- C.
  
  1
Correct Answer
A. 3

Explanation
The correct answer is 3. According to the given information, the motor draws 83 amps at a voltage of 460, and the desired copper wire size is #3. The National Electrical Code (NEC) specifies the minimum wire size based on the current carrying capacity. Since the motor draws 83 amps, the #3 copper wire is permissible as it can handle that current load. Therefore, the minimum size copper wire permissible by code to use is #3.

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10.

For purpose of computing service loads, the voltages not to be used is, 120/220V
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
The statement "For purpose of computing service loads, the voltages not to be used is, 120/220V" is false. This means that the voltages 120/220V can be used for computing service loads.

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11.

The unit lighting load that is specified for, occupancy use in the code book constitutes the required lighting load for each square foot (0.093 mz) of floor area.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
The statement is false because the unit lighting load specified in the code book is not the required lighting load for each square foot of floor area. The unit lighting load is a standard value used for calculations, but the actual required lighting load may vary depending on factors such as the type of occupancy, the purpose of the space, and local regulations.

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12.

Each floor area of a building, dwelling unit, or other area involved shall be, computed from the interior wall dimensions to determine the total square footage for, service load calculations.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
The given statement is false. The total square footage for service load calculations should be computed from the exterior wall dimensions, not the interior wall dimensions.

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13.

The computed floor area of dwelling units, shall include open or enclosed porches.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
The computed floor area of dwelling units does not include open or enclosed porches.

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14.

In all occupancies, what is the minimum design load to include for, each general purpose outlets.
- A.
  
  120 volt-amperes
- B.
  
  180 volt-amperes
- C.
  
  1500 volt-amperes
Correct Answer
B. 180 volt-amperes

Explanation
The minimum design load to include for each general purpose outlet in all occupancies is 180 volt-amperes. This means that the electrical system should be able to handle a load of at least 180 VA for each outlet. This ensures that there is enough power available for typical electrical devices and appliances that may be plugged into the outlets.

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15.

Outlets serving switchboards, and switchgear frames in telephone exchanges need not be included, in minimum design load computations.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
In minimum design load computations, outlets serving switchboards and switchgear frames in telephone exchanges do not need to be included. This is because these outlets are specific to the telephone exchange infrastructure and are not part of the general electrical load that is considered in the design calculations. Therefore, they can be excluded from the computation of the minimum design load.

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16.

An outlet for a specific appliance not covered in Article 220 shall have the computed ampere rating based on what?
- A.
  
  Appliance rated amperes
- B.
  
  180 volt-amperes for outlet
- C.
  
  2000 watts per appliance
Correct Answer
A. Appliance rated amperes

Explanation
The correct answer is "appliance rated amperes". This means that the ampere rating for an outlet for a specific appliance that is not covered in Article 220 (which provides guidelines for calculating electrical loads) should be based on the rated amperes of the appliance itself. This ensures that the outlet can safely handle the electrical current required by the appliance.

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17.

What is the minimum Volt-Amperes per Square Foot of, General Lighting Load for a Barber shop that, you can use?
- A.
  
  2
- B.
  
  3
- C.
  
  3 1/2
Correct Answer
B. 3

Explanation
The minimum Volt-Amperes per Square Foot of General Lighting Load for a Barber shop is 3. This means that for every square foot of the shop, there should be a minimum of 3 Volt-Amperes of general lighting load. This requirement ensures that there is sufficient electrical power for the lighting needs of the barber shop, providing adequate illumination for the workspace and creating a comfortable environment for both the barbers and the customers.

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18.

What is the minimum Volt-Amperes per Square Foot of, General Lighting Load for, a Hospital that you can use?
- A.
  
  2
- B.
  
  3
- C.
  
  3 1/2
Correct Answer
A. 2

Explanation
The correct answer is 2. The minimum Volt-Amperes per Square Foot of General Lighting Load for a Hospital is 2. This means that for every square foot of space in a hospital, there should be a minimum of 2 Volt-Amperes of power allocated for general lighting purposes.

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19.

What is the minimum Volt-Amperes per Square Foot of, General Lighting Load for a School that, you can use?
- A.
  
  2
- B.
  
  3
- C.
  
  3 1/2
Correct Answer
B. 3

Explanation
The minimum Volt-Amperes per Square Foot of General Lighting Load for a School that can be used is 3. This means that for every square foot of the school, there should be a minimum of 3 Volt-Amperes of lighting load. This requirement ensures that there is sufficient electrical capacity to meet the lighting needs of the school, providing adequate illumination for classrooms, hallways, and other areas.

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20.

What is the minimum Volt-Amperes per Square Foot of, General Lighting Load for an auditorium that, you can use?
- A.
  
  1
- B.
  
  2
- C.
  
  3
Correct Answer
A. 1

Explanation
The minimum Volt-Amperes per Square Foot of General Lighting Load for an auditorium is 1. This means that for every square foot of the auditorium, a minimum of 1 Volt-Ampere is required for the general lighting load.

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21.

What is the minimum Volt-Amperes per Square Foot of, General Lighting Load for a Court room that, you can use?
- A.
  
  2
- B.
  
  3
- C.
  
  3 1/2
Correct Answer
A. 2

Explanation
The minimum Volt-Amperes per Square Foot of general lighting load that can be used in a courtroom is 2.

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22.

The volt-amperes of outlets for heavy duty lamp holders shall be computed at a minimum of,
- A.
  
  180
- B.
  
  120
- C.
  
  600
Correct Answer
C. 600

Explanation
The correct answer is 600. This means that the volt-amperes of outlets for heavy duty lamp holders should be calculated at a minimum of 600. This indicates that the outlets need to be able to handle a power load of at least 600 volt-amperes, which is a measure of the total power consumed by the lamps. This requirement ensures that the outlets are capable of supplying enough power for heavy duty lamp holders.

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23.

When a service voltage exceeds 15,000 volts between conductors enter a building, they shall terminate in a?
- A.
  
  Metal enclosed switchgear compartment
- B.
  
  A transformer vault
- C.
  
  A metal enclosed switchgear compartment or a transformer vault
Correct Answer
C. A metal enclosed switchgear compartment or a transformer vault

Explanation
When a service voltage exceeds 15,000 volts between conductors enter a building, it is necessary to terminate the voltage in a metal enclosed switchgear compartment or a transformer vault. This is because these compartments provide the necessary protection and containment for high voltage equipment. They are designed to safely house and control the electrical equipment, ensuring the safety of the building and its occupants. Both options are suitable for terminating the high voltage service voltage and comply with the necessary safety regulations.

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24.

Additional building services, with a supply voltage of 600 volts or less, are permitted when the capacity requirements are in excess of how many amperes?
- A.
  
  2000
- B.
  
  3000
- C.
  
  4000
Correct Answer
B. 3000

Explanation
Additional building services with a supply voltage of 600 volts or less are allowed when the capacity requirements exceed 3000 amperes. This means that if the capacity needed for the building services, such as electrical systems or equipment, is greater than 3000 amperes, it is permissible to have additional services.

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25.

A service supplying a building or other structure can not pass through the interior of another building or other structure.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
This statement is true because a service supplying a building or structure, such as plumbing or electrical wiring, cannot physically pass through the interior of another building or structure without causing damage or disruption. Each building or structure has its own separate infrastructure and systems, and it is not possible for one building's services to directly pass through another.

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26.

Service conductors are considered outside of a building or other structure if, they are installed within a building in a raceway, and encased in not less than how much concrete?
- A.
  
  2'
- B.
  
  4'
- C.
  
  6'
Correct Answer
A. 2'

Explanation
Service conductors are considered outside of a building or other structure if they are installed within a building in a raceway and encased in not less than 2 feet of concrete. This means that if the service conductors are placed inside a building but are surrounded by at least 2 feet of concrete, they are still considered to be outside the building.

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27.

What is the minimum distance of clearance that, service conductors installed as open conductors without an overall outer jacket must have from windows that, are designed to be opened?
- A.
  
  3-Ft
- B.
  
  5-Ft
- C.
  
  6-Ft.
Correct Answer
A. 3-Ft

Explanation
The minimum distance of clearance that service conductors installed as open conductors without an overall outer jacket must have from windows that are designed to be opened is 3 feet. This clearance is necessary to ensure the safety of the windows and prevent any potential hazards or accidents that may arise from the proximity of the conductors.

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28.

What are the minimum requirements for service-drop conductors?
- A.
  
  No. 2 copper wire
- B.
  
  No. 3 copper wire
- C.
  
  No. 6 aluminum
Correct Answer
C. No. 6 aluminum

Explanation
The minimum requirements for service-drop conductors include No. 6 aluminum wire. This means that the conductors used for service drops should be made of No. 6 aluminum wire, which meets the necessary standards and specifications for this purpose.

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29.

For devices rated 800 amperes or less, the next higher standard overcurrent device rating (above the ampacity of the conductors being protected) shall be permitted to be used, provided all required conditions are met, which of the following is/are a required condition/s?
- A.
  
  The conductors being protected are not part of a multi-outlet branch circuit supplying receptacles for cord-and plug-connected portable loads
- B.
  
  The ampacity of the conductors does not correspond with the standard ampere rating of a fuse or a circuit breaker with overload trip adjustments above its rating (but that shall be permitted to have other trip or rating adjustments)
- C.
  
  The next higher standard rating selected does not exceed 800 amperes.
- D.
  
  All Above
Correct Answer
D. All Above

Explanation
All of the given conditions are required in order to use the next higher standard overcurrent device rating for devices rated 800 amperes or less. The first condition states that the conductors being protected should not be part of a multi-outlet branch circuit supplying receptacles for cord-and plug-connected portable loads. The second condition states that the ampacity of the conductors should not correspond with the standard ampere rating of a fuse or a circuit breaker with overload trip adjustments above its rating, but it can have other trip or rating adjustments. The third condition states that the next higher standard rating selected should not exceed 800 amperes. Therefore, all of these conditions must be met.

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30.

What is the primary provision of electricity to a six unit Multi-family dwelling building?
- A.
  
  Service drop
- B.
  
  Main disconnect
Correct Answer
A. Service drop

Explanation
The primary provision of electricity to a six unit Multi-family dwelling building is through a service drop. A service drop refers to the overhead or underground wires that connect the utility's power lines to the building's electrical panel. This is the point where the utility company's responsibility ends, and the building owner's responsibility begins for distributing the electricity to individual units.

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31.

A three gang meter 100 amp service can be installed for, a two unit Multi-family residential dwelling?
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
A three gang meter 100 amp service can be installed for a two-unit multi-family residential dwelling because each unit can be allocated a separate meter and the total service capacity of 100 amps is sufficient to meet the electrical needs of both units. This setup allows for accurate measurement of electricity usage and ensures that each unit is billed separately for their consumption.

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32.

In new or remodeled buildings, complete and detailed electrical plans shall be required to be submitted to and reviewed by the Electrical Bureau prior to the start of work on Multi-family dwelling-type (less than 400 amps services) occupancies two stories in height (18-27-215.5.)
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
In new or remodeled buildings, complete and detailed electrical plans are not required to be submitted to and reviewed by the Electrical Bureau prior to the start of work on Multi-family dwelling-type (less than 400 amps services) occupancies two stories in height (18-27-215.5).

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33.

In new or remodeled buildings, complete and detailed electrical plans shall be required to be submitted to and reviewed by the Electrical Bureau prior to the start of work on Warehouses greater than two stories in height (18-27-215.5.)
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
In new or remodeled buildings, it is necessary to submit complete and detailed electrical plans to the Electrical Bureau before starting work on Warehouses greater than two stories in height. This ensures that the electrical systems in these buildings are properly designed and installed, meeting safety standards and regulations. By reviewing these plans, the Electrical Bureau can identify any potential issues or hazards and provide guidance to ensure compliance with electrical codes. Therefore, the statement "True" is the correct answer.

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34.

In new or remodeled buildings, complete and detailed electrical plans shall be required to be submitted to and reviewed by the Electrical Bureau prior to the start of work on Commercial and/or industrial-type (200 amp, 120/240 Volt, 1P, 3W service) occupancies one story (18-27-215.5.)
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
In new or remodeled buildings, complete and detailed electrical plans are not required to be submitted to and reviewed by the Electrical Bureau prior to the start of work on Commercial and/or industrial-type (200 amp, 120/240 Volt, 1P, 3W service) occupancies one story (18-27-215.5.). Therefore, the statement is false.

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35.

In new or remodeled buildings, complete and detailed electrical plans shall be required to be submitted to and reviewed by the Electrical Bureau prior to the start of work on New or replacement services or feeders rated 400 amperes or greater (18-27-215.5.)
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
In new or remodeled buildings, it is necessary to submit complete and detailed electrical plans to the Electrical Bureau before starting work on new or replacement services or feeders rated 400 amperes or greater. This ensures that the electrical work is reviewed and approved, ensuring safety and compliance with regulations. Therefore, the statement "True" is the correct answer.

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36.

In new or remodeled buildings, complete and detailed electrical plans shall be required to be submitted to and reviewed by the Electrical Bureau prior to the start of work on Electrical heating systems with connected loads in excess of 5 kw (18-27-215.5.)
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
In new or remodeled buildings, it is necessary to submit complete and detailed electrical plans to the Electrical Bureau before beginning work on electrical heating systems with connected loads exceeding 5 kW. This ensures that the electrical systems are properly designed and installed, meeting safety standards and regulations.

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37.

In new or remodeled buildings, complete and detailed electrical plans shall be required to be submitted to and reviewed by the Electrical Bureau prior to the start of work on Swimming pools (18-27-215.5.)
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
In new or remodeled buildings, it is necessary to submit complete and detailed electrical plans to the Electrical Bureau before starting work on swimming pools. This ensures that the electrical systems in the swimming pools are designed and installed correctly, reducing the risk of electrical hazards and ensuring the safety of the users. Therefore, the statement is true.

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38.

Unless otherwise indicated torque requirements for motor control circuit device terminals shall be a minimum of, how many pounds per inches for screw-type pressure terminals used for 14 AWG and smaller copper conductors.
- A.
  
  7
- B.
  
  8
- C.
  
  9
- D.
  
  10
Correct Answer
A. 7

Explanation
The correct answer is 7. This means that the torque requirements for motor control circuit device terminals should be a minimum of 7 pounds per inch for screw-type pressure terminals used for 14 AWG and smaller copper conductors.

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39.

Which switches must indicate whether they are in the open or closed position?
- A.
  
  General-use switches
- B.
  
  Motor-circuit switches
- C.
  
  Circuit breakers
- D.
  
  All of these
Correct Answer
D. All of these

Explanation
All of these switches must indicate whether they are in the open or closed position. This is because it is important to know the status of the switches for safety and operational purposes. In general-use switches, it allows users to control the flow of electricity in a circuit. In motor-circuit switches, it helps in controlling the power supply to motors. Circuit breakers also need to indicate their position to show whether the circuit is open or closed, and to protect against overloads or short circuits. Therefore, all of these switches should have indicators to show their open or closed position.

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40.

Service disconnecting means shall be installed at what kind of location.
- A.
  
  Dry location with-in 10 ft of service entrance to building
- B.
  
  Readily accessible location with-in 5 ft of service entrance to building
Correct Answer
B. Readily accessible location with-in 5 ft of service entrance to building

Explanation
The correct answer is "readily accessible location with-in 5 ft of service entrance to building." This means that the service disconnecting means, which is used to disconnect the electrical supply to a building or structure, should be installed in a location that is easily accessible and within 5 feet of the service entrance. This ensures that it can be quickly and easily reached in case of an emergency or for maintenance purposes.

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41.

When bonding enclosures; metal raceways; frames; fittings and other metal non current-carrying parts; any non-conductive paint; enamel; or similar coating shall be removed at, what location?
- A.
  
  Contact points
- B.
  
  Contact surfaces
- C.
  
  Threads
- D.
  
  All of these
Correct Answer
D. All of these

Explanation
When bonding enclosures, metal raceways, frames, fittings, and other metal non current-carrying parts, it is important to remove any non-conductive paint, enamel, or similar coating at contact points, contact surfaces, and threads. This ensures that there is proper electrical conductivity and bonding between the metal parts, reducing the risk of electrical hazards and ensuring the effectiveness of the bonding process.

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42.

Two conductor NM cables cannot be stapled on edge.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
Two conductor NM cables cannot be stapled on edge because it can damage the cables and compromise their insulation. When stapling cables, it is important to ensure that they are properly secured without causing any harm to the wires. Stapling on the edge can lead to punctures or cuts in the cables, which can result in electrical hazards or malfunctions. Therefore, it is recommended to staple the cables flat against a surface to maintain their integrity and prevent any potential issues.

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43.

These units of electric load must be converted to amperes in order to obtain the size of wire necessary to carry the load (Kilowatts, Volt amperes, Kilovolt amperes, and Horsepower). Ref: R. S. Means - D5010-120 Electric Circuit Voltages
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
The statement is true because in order to determine the size of wire necessary to carry the load, the electric load units such as kilowatts, volt amperes, kilovolt amperes, and horsepower need to be converted to amperes. This is because amperes is the unit used to measure electric current, and the size of wire needed depends on the amount of current that needs to be carried.

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44.

Maximum Circuit Length: As indicated on Table D5010-130, R. S. Means Electrical Cost Data Book, a 130 ampere load at 480 volts, 3 phase, 3 wire with No. 1 wire can be run a maximum of how many _____ L.F. and provide satisfactory operation?
- A.
  
  555
- B.
  
  655
- C.
  
  755
Correct Answer
A. 555

Explanation
According to Table D5010-130 in the R. S. Means Electrical Cost Data Book, a 130 ampere load at 480 volts, 3 phase, 3 wire with No. 1 wire can be run a maximum of 555 L.F. and provide satisfactory operation.

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45.

What is the ampacity for a type HPD No. 14 flexible cord with four current-carrying conductors?
- A.
  
  20 amperes
- B.
  
  17 amperes
- C.
  
  16 amperes
- D.
  
  14 amperes
Correct Answer
C. 16 amperes

Explanation
The ampacity for a type HPD No. 14 flexible cord with four current-carrying conductors is 16 amperes. The ampacity refers to the maximum amount of current that a conductor or cable can safely carry without exceeding its temperature rating. In this case, the type HPD No. 14 flexible cord is designed to handle a maximum of 16 amperes of current when there are four current-carrying conductors present.

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46.

Which of the following is a provision of the Chicago Electrical Code for transformers?
- A.
  
  Water piping is not permitted to pass through a transformer vault.
- B.
  
  Electric furnace transformers with a total rating greater than 25 KVA shall be installed in a vault.
Correct Answer
A. Water piping is not permitted to pass through a transformer vault.

Explanation
The provision of the Chicago Electrical Code for transformers states that water piping is not allowed to pass through a transformer vault. This regulation ensures the safety and integrity of the transformer by preventing any potential water damage that could occur if the piping were to leak or break. By prohibiting water piping in the vault, the code aims to minimize the risk of electrical malfunctions or accidents caused by water contact.

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47.

Unless otherwise specified, conductors normally used to carry current shall be
- A.
  
  Copper
- B.
  
  Aluminum
- C.
  
  Copper clad
- D.
  
  Silver plated.
Correct Answer
A. Copper

Explanation
Copper is the most commonly used conductor for carrying current. It has low resistance, high electrical conductivity, and good thermal conductivity, making it an ideal choice for conducting electricity. Copper is also highly durable and resistant to corrosion, ensuring a long lifespan for the conductor. Additionally, copper is readily available and relatively affordable compared to other conductive materials. Therefore, copper is the preferred choice for conducting current in most applications unless otherwise specified.

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48.

The code definition of voltages means the voltage rating of electrical equipment shall not be less than the nominal voltage of a circuit to which it is connected?(18-27-110.4.)
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
The statement is true because according to the code definition of voltages, the voltage rating of electrical equipment should always be equal to or greater than the nominal voltage of the circuit it is connected to. This ensures that the equipment can handle the electrical load and prevents any potential damage or malfunctioning that may occur if the voltage rating is lower than the nominal voltage.

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49.

The code definition of Accessible (as applied to wiring methods) means capable of being removed or exposed without damaging the building structure? (18-27-100)
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
The code definition of Accessible (as applied to wiring methods) means that the wiring methods can be removed or exposed without causing any damage to the building structure. This implies that the wiring is easily accessible for maintenance or repairs without causing any harm to the overall structure of the building. Therefore, the correct answer is True.

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50.

The code definition of Accessible (as applied to equipment) means admitting close approach: but guarded by locked doors, elevation, or other effective means?(18-27-100)
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
The code definition of Accessible (as applied to equipment) does not mean admitting close approach, but rather means that access to the equipment is restricted by locked doors, elevation, or other effective means. Therefore, the correct answer is False.

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Chicago Electrical Exam

A motor draws 165 amps at a voltage of 460 with a feeder ft. length of 190. The copper wire (75 degree C) size desired is #2/0, what would the voltage drop be?

A motor draws 83 amps at a voltage of 460 with a feeder ft. length of 190. The copper wire (75 degree C) size desired is #3, what would the voltage drop be?"

A motor draws 21amps at a voltage of 230 with a feeder ft. length of 160. The copper wire (75 degree C) size desired is #10, Which minimum size copper wire is permissible by code to use?"

A motor draws 32 amps at a voltage of 230 with a feeder ft. length of 150. The copper wire (75 degree C) size desired is #8, Which minimum size copper wire is permissible by code to use?"

A motor draws 85 amps at a voltage of 230 with a feeder ft. length of 160. The copper wire (75 degree C) size desired is #3, Which minimum size copper wire is permissible by code to use?

A motor draws 21 amps at a voltage of 460 with a feeder ft. length of 190. The copper wire (75 degree C) size desired is #10, Which minimum size copper wire is permissible by code to use?

A motor draws 47 amps at a voltage of 460 with a feeder ft. length of 190. The copper wire (75 degree C) size desired is #8, Which minimum size copper wire is permissible by code to use?

A motor draws 165 amps at a voltage of 460 with a feeder ft. length of 190. The copper wire (75 degree C) size desired is #2/0, Which minimum size copper wire is permissible by code to use?

A motor draws 83 amps at a voltage of 460 with a feeder ft. length of 190. The copper wire (75 degree C) size desired is #3, Which minimum size copper wire is permissible by code to use?

For purpose of computing service loads, the voltages not to be used is, 120/220V

The unit lighting load that is specified for, occupancy use in the code book constitutes the required lighting load for each square foot (0.093 mz) of floor area.

Each floor area of a building, dwelling unit, or other area involved shall be, computed from the interior wall dimensions to determine the total square footage for, service load calculations.

The computed floor area of dwelling units, shall include open or enclosed porches.

In all occupancies, what is the minimum design load to include for, each general purpose outlets.

Outlets serving switchboards, and switchgear frames in telephone exchanges need not be included, in minimum design load computations.

An outlet for a specific appliance not covered in Article 220 shall have the computed ampere rating based on what?

What is the minimum Volt-Amperes per Square Foot of, General Lighting Load for a Barber shop that, you can use?

What is the minimum Volt-Amperes per Square Foot of, General Lighting Load for, a Hospital that you can use?

What is the minimum Volt-Amperes per Square Foot of, General Lighting Load for a School that, you can use?

What is the minimum Volt-Amperes per Square Foot of, General Lighting Load for an auditorium that, you can use?

What is the minimum Volt-Amperes per Square Foot of, General Lighting Load for a Court room that, you can use?

The volt-amperes of outlets for heavy duty lamp holders shall be computed at a minimum of,

When a service voltage exceeds 15,000 volts between conductors enter a building, they shall terminate in a?

Additional building services, with a supply voltage of 600 volts or less, are permitted when the capacity requirements are in excess of how many amperes?

A service supplying a building or other structure can not pass through the interior of another building or other structure.

Service conductors are considered outside of a building or other structure if, they are installed within a building in a raceway, and encased in not less than how much concrete?

What is the minimum distance of clearance that, service conductors installed as open conductors without an overall outer jacket must have from windows that, are designed to be opened?

What are the minimum requirements for service-drop conductors?

For devices rated 800 amperes or less, the next higher standard overcurrent device rating (above the ampacity of the conductors being protected) shall be permitted to be used, provided all required conditions are met, which of the following is/are a required condition/s?

What is the primary provision of electricity to a six unit Multi-family dwelling building?

A three gang meter 100 amp service can be installed for, a two unit Multi-family residential dwelling?

In new or remodeled buildings, complete and detailed electrical plans shall be required to be submitted to and reviewed by the Electrical Bureau prior to the start of work on Multi-family dwelling-type (less than 400 amps services) occupancies two stories in height (18-27-215.5.)

In new or remodeled buildings, complete and detailed electrical plans shall be required to be submitted to and reviewed by the Electrical Bureau prior to the start of work on Warehouses greater than two stories in height (18-27-215.5.)

In new or remodeled buildings, complete and detailed electrical plans shall be required to be submitted to and reviewed by the Electrical Bureau prior to the start of work on Commercial and/or industrial-type (200 amp, 120/240 Volt, 1P, 3W service) occupancies one story (18-27-215.5.)

In new or remodeled buildings, complete and detailed electrical plans shall be required to be submitted to and reviewed by the Electrical Bureau prior to the start of work on New or replacement services or feeders rated 400 amperes or greater (18-27-215.5.)

In new or remodeled buildings, complete and detailed electrical plans shall be required to be submitted to and reviewed by the Electrical Bureau prior to the start of work on Electrical heating systems with connected loads in excess of 5 kw (18-27-215.5.)

In new or remodeled buildings, complete and detailed electrical plans shall be required to be submitted to and reviewed by the Electrical Bureau prior to the start of work on Swimming pools (18-27-215.5.)

Unless otherwise indicated torque requirements for motor control circuit device terminals shall be a minimum of, how many pounds per inches for screw-type pressure terminals used for 14 AWG and smaller copper conductors.

Which switches must indicate whether they are in the open or closed position?

Service disconnecting means shall be installed at what kind of location.

When bonding enclosures; metal raceways; frames; fittings and other metal non current-carrying parts; any non-conductive paint; enamel; or similar coating shall be removed at, what location?

Two conductor NM cables cannot be stapled on edge.

These units of electric load must be converted to amperes in order to obtain the size of wire necessary to carry the load (Kilowatts, Volt amperes, Kilovolt amperes, and Horsepower). Ref: R. S. Means - D5010-120 Electric Circuit Voltages

Maximum Circuit Length: As indicated on Table D5010-130, R. S. Means Electrical Cost Data Book, a 130 ampere load at 480 volts, 3 phase, 3 wire with No. 1 wire can be run a maximum of how many _____ L.F. and provide satisfactory operation?

What is the ampacity for a type HPD No. 14 flexible cord with four current-carrying conductors?

Which of the following is a provision of the Chicago Electrical Code for transformers?

Unless otherwise specified, conductors normally used to carry current shall be

The code definition of voltages means the voltage rating of electrical equipment shall not be less than the nominal voltage of a circuit to which it is connected?(18-27-110.4.)

The code definition of Accessible (as applied to wiring methods) means capable of being removed or exposed without damaging the building structure? (18-27-100)

The code definition of Accessible (as applied to equipment) means admitting close approach: but guarded by locked doors, elevation, or other effective means?(18-27-100)