Question 1

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

Accepted Answer

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

Question 2

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) 135 
A) 45 
B) 60 
C) 90 
D) 135 C

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.

Accepted Answer

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

Question 4

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

Accepted Answer

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

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.

Accepted Answer

A) ell 
B) tee 
C) junction box 
D) fusebox 
A) ell 
B) tee 
C) junction box 
D) fusebox

Question 6

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

Accepted Answer

In the past, panelboards were defined tw

Question 7

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

Accepted Answer

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

Question 8

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

Accepted Answer

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

Question 9

What are the requirements for panelboard cabinet sizing?

Accepted Answer

If there are special requirements for us

Question 10

What are the requirements for preparing a circuit directory?

Accepted Answer

NEC 408.4 is very clear as to its requir

Question 11

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) blue 
A) green 
B) black 
C) yellow 
D) blue

Question 12

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

Accepted Answer

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

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.

Accepted Answer

A) 15 
B) 30 
C) 50 
D) 100 
A) 15 
B) 30 
C) 50 
D) 100

Question 14

Do not confuse the term with room.

Accepted Answer

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

Question 15

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

Accepted Answer

It seems obvious that there should be no

Question 16

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

Accepted Answer

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

Question 17

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

Accepted Answer

Condition 1-Exposed live parts on one si

Question 18

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

Accepted Answer

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

Question 19

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) lightboard 
A) panelboard 
B) switchboard 
C) fusebox 
D) lightboard

Question 20

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

Accepted Answer

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

Exam 12: Panelboard Selection and Installation

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

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

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

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

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

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

What are the requirements for panelboard cabinet sizing?

What are the requirements for preparing a circuit directory?

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

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

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.

Do not confuse the term with room.

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

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

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

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

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.

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

Commercial Building Plans and Specifications

Reading Electrical Working Drawings- Entry Level

Calculating the Electrical Load

Branch Circuits

Switches and Receptacles

Wiring Methods

Motor and Appliance Circuits

Feeders

Special Systems

Working Drawings- Upper Level

Special Circuits Owners Circuits

The Electric Service

Lamps and Ballasts for Lighting

Luminaires

Emergency, Legally Required Sstandby, 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 Protection

Low-Voltage Remote-Control

The Cooling System

Commercial Utility Interactive Photovoltaic Systems

Filters