Deck 12: Panelboard Selection and Installation

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

Answer 1

A

Question 2

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

A)safety
B)registration
C)precision
D)scheduling

Answer 2

A

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

Answer 3

B

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

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

Question 6

What are the requirements for panelboard cabinet sizing?

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

Question 8

What are the requirements for preparing a circuit directory?

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

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

Question 11

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

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

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

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

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

Question 16

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

A)voltage-carrying
B)current-carrying
C)resistance
D)impedance

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

Question 18

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

A)dimensions
B)ampacity
C)resistance
D)voltage drop

Question 19

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

Question 20

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