Question 1

For electrical equipment not considered large, at least ____  entrance(s)of sufficient area is required to provide access to and egress from the working space.
A)one
B)two
C)three
D)four

Accepted Answer

For electrical equipment not considered large, at least one entrance of sufficient area is required to provide access to and egress from the working space, ensuring safety and accessibility for maintenance and inspection.

Question 2

The reasoning for identifying the system voltage(s)and phases is ____.
A)safety
B)registration
C)precision
D)scheduling

Accepted Answer

Identifying system voltages and phases is crucial for safety reasons. It ensures that electrical systems are correctly and safely installed, maintained, and operated, preventing accidents and injuries.

Question 3

NEC 408.36(A)stipulates that if the panelboard contains snap switches with a rating of ____ amperes or less, the panelboard overcurrent protection is not permitted to exceed 200 amperes. A)15 B)30 C)50 D)100

Accepted Answer

NEC 408.36(A) specifies that if a panelboard contains snap switches with a rating of 30 amperes or less, the panelboard's overcurrent protection must not exceed 200 amperes.

Question 4

Unused openings in panelboards and switches should be ____.
A)marked as a pinch point
B)marked as a hazard point
C)available for expansion
D)closed

Accepted Answer

Unused openings in panelboards and switches should be closed to prevent accidental contact with live parts and to maintain the integrity of the protective enclosure.

Question 5

Separate feeders are to be run from the main service equipment to each of the areas of the commercial building. Each feeder will terminate in a ____, which generally will be installed in the area to be served.
A)panelboard
B)switchboard
C)fusebox
D)lightboard

Accepted Answer

Panelboards are commonly used as the termination point for feeders in commercial buildings, serving the area with circuits for power and lighting.

Question 6

What are the requirements for panelboard cabinet sizing?

Accepted Answer

The answer of What are the requirements for panelboard cabinet...

Question 7

For system voltages of 0 to 150 volts to ground, the minimum depth of working space is ____ ft under all three working space conditions.
A)1
B)2
C)3
D)4

Accepted Answer

The National Electrical Code (NEC) specifies that the minimum depth of working space for systems with voltages of 0 to 150 volts to ground is 3 feet under all conditions.

Question 8

What are the requirements for preparing a circuit directory?

Accepted Answer

The answer of What are the requirements for preparing a...

Question 9

All working spaces must allow for the opening of equipment doors and hinged panels to at least a ____ degree position.
A)45
B)60
C)90
D)135

Accepted Answer

All working spaces must allow for the opening of equipment doors and hinged panels to at least a 90-degree position to ensure safe and easy access for maintenance, inspection, and operation.

Question 10

The circuit directory gives the ____ for each circuit in a wording that would be clear for "nonelectrical" people to decipher and identify the circuit number for luminaires, receptacles, appliances, or equipment.
A)ampacity
B)current limit
C)purpose of use
D)panelboard rating

Accepted Answer

The circuit directory provides the purpose of use for each circuit, making it easier for individuals without electrical knowledge to understand and identify the circuit number for various electrical components.

Question 11

​If more than one system voltage is used for premises wiring, how should panelboards be marked?

Accepted Answer

The answer of ​If more than one system voltage is...

Question 12

Conductors for 480Y/277-volt systems are generally brown, orange, ____ for the ungrounded conductors and gray for the grounded conductor..
A)green
B)black
C)yellow
D)blue

Accepted Answer

For 480Y/277-volt systems, the standard color coding for ungrounded conductors is brown, orange, and yellow. Gray is used for the grounded conductor, and green is typically used for the grounding conductor.

Question 13

Often a feeder serves two or more panelboards, in which case either a(n)____ or wireway is installed or the feeder connects to the first panelboard and then is extended to the others.
A)ell
B)tee
C)junction box
D)fusebox

Accepted Answer

A junction box is used when a feeder serves two or more panelboards, allowing for the distribution of power to multiple locations. It acts as a central point where the feeder can connect and then extend to other panelboards.

Question 14

Working space height is required to not be less than ____ ft.
A)5.5
B)6.5
C)7.5
D)8.5

Accepted Answer

The correct working space height required is not less than 6.5 feet. This is a standard safety requirement to ensure adequate space for movement and to prevent accidents in work environments.

Question 15

In general, panelboards are constructed so the ____ run vertically for nearly the height of the panelboard.
A)branch circuits
B)receptacles
C)cross feed buses
D)main feed busbars

Accepted Answer

Panelboards are designed with the main feed busbars running vertically for nearly the height of the panelboard. This design allows for efficient distribution of power to the various circuits connected to the panelboard.

Question 16

Panelboard ratings are determined by the ____ capacity of the internal main bus.
A)voltage-carrying
B)current-carrying
C)resistance
D)impedance

Accepted Answer

Panelboard ratings are determined by the current-carrying capacity of the internal main bus, which dictates how much current the panelboard can safely distribute.

Question 17

Most large commercial buildings use two voltages: 480Y/277 volts and ____/120 volts.
A)480 delta
B)365Y
C)208 delta
D)208Y

Accepted Answer

Most large commercial buildings use two voltages: 480Y/277 volts for high-power equipment and 208Y/120 volts for general power needs and lighting.

Question 18

The feeder overcurrent protection is sized for the ____ of the feeder conductor.
A)dimensions
B)ampacity
C)resistance
D)voltage drop

Accepted Answer

The feeder overcurrent protection is sized based on the ampacity of the feeder conductor to ensure it can handle the maximum current expected without overheating or causing damage.

Question 19

What is the difference between past and current usages of the term panelboard?

Accepted Answer

The answer of What is the difference between past and...

Question 20

What are the three conditions related to live parts and working space?

Accepted Answer

The answer of What are the three conditions related to...

Quiz 12: Panelboard Selection and Installation

For electrical equipment not considered large, at least ____ entrance(s) of sufficient area is required to provide access to and egress from the working space.

The reasoning for identifying the system voltage(s) and phases is ____.

NEC 408.36(A) stipulates that if the panelboard contains snap switches with a rating of ____ amperes or less, the panelboard overcurrent protection is not permitted to exceed 200 amperes.

Unused openings in panelboards and switches should be ____.

Separate feeders are to be run from the main service equipment to each of the areas of the commercial building. Each feeder will terminate in a ____, which generally will be installed in the area to be served.

What are the requirements for panelboard cabinet sizing?

For system voltages of 0 to 150 volts to ground, the minimum depth of working space is ____ ft under all three working space conditions.

What are the requirements for preparing a circuit directory?

All working spaces must allow for the opening of equipment doors and hinged panels to at least a ____ degree position.

The circuit directory gives the ____ for each circuit in a wording that would be clear for "nonelectrical" people to decipher and identify the circuit number for luminaires, receptacles, appliances, or equipment.

If more than one system voltage is used for premises wiring, how should panelboards be marked?

Conductors for 480Y/277-volt systems are generally brown, orange, ____ for the ungrounded conductors and gray for the grounded conductor..

Often a feeder serves two or more panelboards, in which case either a(n) ____ or wireway is installed or the feeder connects to the first panelboard and then is extended to the others.

Working space height is required to not be less than ____ ft.

In general, panelboards are constructed so the ____ run vertically for nearly the height of the panelboard.

Panelboard ratings are determined by the ____ capacity of the internal main bus.

Most large commercial buildings use two voltages: 480Y/277 volts and ____/120 volts.

The feeder overcurrent protection is sized for the ____ of the feeder conductor.

What is the difference between past and current usages of the term panelboard?

What are the three conditions related to live parts and working space?

Quiz 12: Panelboard Selection and Installation

For electrical equipment not considered large, at least ____ entrance(s) of sufficient area is required to provide access to and egress from the working space.

The reasoning for identifying the system voltage(s) and phases is ____.

NEC 408.36(A) stipulates that if the panelboard contains snap switches with a rating of ____ amperes or less, the panelboard overcurrent protection is not permitted to exceed 200 amperes.

Unused openings in panelboards and switches should be ____.

Separate feeders are to be run from the main service equipment to each of the areas of the commercial building. Each feeder will terminate in a ____, which generally will be installed in the area to be served.

What are the requirements for panelboard cabinet sizing?

For system voltages of 0 to 150 volts to ground, the minimum depth of working space is ____ ft under all three working space conditions.

What are the requirements for preparing a circuit directory?

All working spaces must allow for the opening of equipment doors and hinged panels to at least a ____ degree position.

The circuit directory gives the ____ for each circuit in a wording that would be clear for "nonelectrical" people to decipher and identify the circuit number for luminaires, receptacles, appliances, or equipment.

​If more than one system voltage is used for premises wiring, how should panelboards be marked?

Conductors for 480Y/277-volt systems are generally brown, orange, ____ for the ungrounded conductors and gray for the grounded conductor..

Often a feeder serves two or more panelboards, in which case either a(n) ____ or wireway is installed or the feeder connects to the first panelboard and then is extended to the others.

Working space height is required to not be less than ____ ft.

In general, panelboards are constructed so the ____ run vertically for nearly the height of the panelboard.

Panelboard ratings are determined by the ____ capacity of the internal main bus.

Most large commercial buildings use two voltages: 480Y/277 volts and ____/120 volts.

The feeder overcurrent protection is sized for the ____ of the feeder conductor.

What is the difference between past and current usages of the term panelboard?

What are the three conditions related to live parts and working space?

If more than one system voltage is used for premises wiring, how should panelboards be marked?