Deck 12: Panelboard Selection and Installation

Question 1

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

Answer 1

C

Question 2

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

Answer 2

Condition 1-Exposed live parts on one side of the working space and no live or grounded parts on the other side of the working space, or exposed live parts on both sides of the working space that are effectively guarded by insulating materials.
Condition 2-Exposed live parts on one side of the working space and grounded parts on the other
side of the working space.Concrete, brick, or tile walls are considered as grounded.
Condition 3-Exposed live parts on both sides of the working space.

Question 3

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

A)area
B)load plan
C)load/area
D)path

Answer 3

C

Question 4

What are the requirements for preparing a circuit directory?

Question 5

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

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

Question 6

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

Question 7

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

A)480 delta
B)365Y
C)208 delta
D)208Y

Question 8

Working space height is required to not be less than ft.(2.0 m).

A)5.5
B)6.5
C)7.5
D)8.5

Question 9

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 10

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

A)branch circuits
B)receptacles
C)snap switches
D)main feed busbars

Question 11

What are the requirements for panelboard cabinet sizing?

Question 12

Access to and egress from refer to the actual working space requirements about electrical equipment, not to the ____.

A)room itself
B)doorway
C)panelboard
D)circuitry

Question 13

When using a 3-phase supply, the incremental number for determining overcurrent devices is poles.

A)3
B)6
C)10
D)12

Question 14

What should you do if there are unused openings in a panelboard?

Question 15

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 16

Do not confuse the term with room.

A)building
B)working space
C)access point
D)job area

Question 17

For system voltages of 0 to 150 volts to ground, the minimum depth of working space is ft.(914 mm).

A)1
B)2
C)3
D)4

Question 18

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 19

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

Question 20

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

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