Exam 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.

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(Multiple Choice)

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Question 1

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What are the requirements for panelboard cabinet sizing?

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(Essay)

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Question 2

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If there are special requirements for using the wiring gutters in a panelboard, the physical size of the cabinet is required to be sufficient to accommodate those requirements. Often a feeder serves two or more panelboards, in which case either a junction box or wireway is installed or the feeder connects to the first panelboard and then is extended to the others. In some cases, double lugs are installed for the phase conductors and neutral, if used. Other designs have feed-through lugs with the supply-side feeder conductors connected to the line terminals of the first panelboard and conductors of the same size connected from the load terminals of the first panelboard to the line terminals of the second panelboard. Both methods require the installation of additional feeder conductors. The cabinet must have sufficient gutter width for bending these conductors and for the required splices if splices are made.

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

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Question 3

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What are the requirements for preparing a circuit directory?

(Essay)

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Question 4

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.

(Multiple Choice)

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Question 5

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.

(Multiple Choice)

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Question 6

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

(Essay)

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Question 7

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

(Essay)

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Question 8

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

(Multiple Choice)

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Question 9

Unused openings in panelboards and switches should be ____.

(Multiple Choice)

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Question 10

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

(Multiple Choice)

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Question 11

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

(Essay)

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Question 12

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

(Multiple Choice)

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Question 13

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.

(Multiple Choice)

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Question 14

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

(Multiple Choice)

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Question 15

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

(Multiple Choice)

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Question 16

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.

(Multiple Choice)

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Question 17

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

(Multiple Choice)

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Question 18

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

(Multiple Choice)

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Question 19

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

(Multiple Choice)

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Question 20

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Exam 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.

What are the requirements for panelboard cabinet sizing?

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

What are the requirements for preparing a circuit directory?

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.

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.

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

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

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

Unused openings in panelboards and switches should be ____.

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

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

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

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.

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

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

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.

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

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

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

Commercial Building Plans and Specifications

Reading Electrical Working Drawings--Entry Level

General Requirements for Conductors

Branch Circuits

Switches and Receptacles

Wiring Methods

Motor and Appliance Circuits

Feeder Installation and Load Calculation

Special Systems

Working Drawings--Upper Level

Special Circuits Owners Circuits

The Electric Service and Grounding

Lamps and Ballasts for Lighting

Luminaires

Emergency, Legally Required Standby, and Optional Standby Power Systems

Overcurrent Protection: Fuses and Circuit Breakers

Short-Circuit Calculations and Coordination of Overcurrent Protective Devices

Equipment and Conductor Short-Circuit

Low-Voltage Remote Control

The Cooling System

Commercial Utility-Interactive Photovoltaic Systems

Filters

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