Question 1

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

Accepted Answer

A)  1
B)  2
C)  3
D)  4E) A) and B)
F) A) and C)

Question 2

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

Accepted Answer

A)  branch circuits
B)  receptacles
C)  cross feed buses
D)  main feed busbarsE) B) and C)
F) A) and C)

Question 3

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

Accepted Answer

A)  45
B)  60
C)  90
D)  135E) A) and B)
F) A) and C) C

Question 4

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

Accepted Answer

A)  voltage-carrying
B)  current-carrying
C)  resistance
D)  impedanceE) A) and D)
F) None of the above

Question 5

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

Accepted Answer

A)  safety
B)  registration
C)  precision
D)  schedulingE) All of the above
F) B) and D)

Question 6

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.

Accepted Answer

A)  ampacity
B)  current limit
C)  purpose of use
D)  panelboard ratingE) None of the above
F) A) and B)

Question 7

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

Accepted Answer

NEC 210.5(C)requires that where more...

Question 8

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

Accepted Answer

Condition 1-Exposed live parts on one si...

Question 9

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

Accepted Answer

A)  5.5
B)  6.5
C)  7.5
D)  8.5E) B) and C)
F) A) and D)

Question 10

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.

Accepted Answer

A)  ell
B)  tee
C)  junction box
D)  fuseboxE) B) and C)
F) C) and D)

Question 11

What are the requirements for panelboard cabinet sizing?

Accepted Answer

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.

Question 12

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

Accepted Answer

A)  dimensions
B)  ampacity
C)  resistance
D)  voltage dropE) None of the above
F) B) and C)

Question 13

Unused openings in panelboards and switches should be ____.

Accepted Answer

A)  marked as a pinch point
B)  marked as a hazard point
C)  available for expansion
D)  closedE) A) and D)
F) B) and D)

Question 14

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.

Accepted Answer

A)  15
B)  30
C)  50
D)  100E) A) and D)
F) A) and C)

Question 15

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.

Accepted Answer

A)  one
B)  two
C)  three
D)  fourE) All of the above
F) B) and D) A

Question 16

What are the requirements for preparing a circuit directory?

Accepted Answer

NEC 408.4 is very clear as to its requi...

Question 17

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

Accepted Answer

A)  480 delta
B)  365Y
C)  208 delta
D)  208YE) A) and B)
F) A) and C)

Question 18

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.

Accepted Answer

A)  panelboard
B)  switchboard
C)  fusebox
D)  lightboardE) C) and D)
F) All of the above

Question 19

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

Accepted Answer

A)  green
B)  black
C)  yellow
D)  blueE) A) and B)
F) None of the above

Question 20

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

Accepted Answer

In the past, panelboards were defined tw...

Exam 12: Panelboard Selection and Installation

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified
C

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

Correct Answer
verified

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

Correct Answer
verified

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.

Correct Answer
verified

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

Correct Answer
verified

NEC 210.5(C)requires that where more...
View Answer

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

Correct Answer
verified
Condition 1-Exposed live parts on one si...
View Answer

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

Correct Answer
verified

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.

Correct Answer
verified

What are the requirements for panelboard cabinet sizing?

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

Correct Answer
verified

Unused openings in panelboards and switches should be ____.

Correct Answer
verified

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.

Correct Answer
verified

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.

Correct Answer
verified
A

What are the requirements for preparing a circuit directory?

Correct Answer
verified
NEC 408.4 is very clear as to its requi...
View Answer

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

Correct Answer
verified

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.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified
In the past, panelboards were defined tw...
View Answer

Exam 12: Panelboard Selection and Installation

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct Answerverified​ NEC 210.5(C)requires that where more...View AnswerShow Answer

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

Correct AnswerverifiedCondition 1-Exposed live parts on one si...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

What are the requirements for panelboard cabinet sizing?

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

Correct AnswerverifiedShow Answer

Unused openings in panelboards and switches should be ____.

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedA

What are the requirements for preparing a circuit directory?

Correct AnswerverifiedNEC 408.4 is very clear as to its requi...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedIn the past, panelboards were defined tw...View AnswerShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

NEC 210.5(C)requires that where more...
View Answer

Correct Answer
verified
Condition 1-Exposed live parts on one si...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A

Correct Answer
verified
NEC 408.4 is very clear as to its requi...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
In the past, panelboards were defined tw...
View Answer