Question 1

Two single-pole breakers require installation space________ that of a double-pole breaker.

Accepted Answer

A)  a quarter 
B)  one-half 
C)  equal to 
D)  double 
A)  a quarter 
B)  one-half 
C)  equal to 
D)  double C

Question 2

Circuit control and________ protection must be provided for all circuits and the power-consuming devices connected to these circuits.

Accepted Answer

A)  lighting 
B)  appliance 
C)  busway 
D)  overcurrent 
A)  lighting 
B)  appliance 
C)  busway 
D)  overcurrent D

Question 3

What requirements should be followed for lighting and appliance panelboards?

Accepted Answer

For these panelboards, follow these requirements:
-The panelboard shall have a rating of not less than the minimum feeder capacity as calculated according to NEC Article 408.
-The panelboard must be protected using an overcurrent protective device with a trip setting not exceeding the rating of the panelboard.
-The total 3-hour load shall not exceed 80 percent of the panelboard rating except when specifically rated for 100 percent continuous duty.

Question 4

When planning or diagramming a floor-mounted transformer supplying a power panelboard, what are important components to include?

Accepted Answer

You should include the following:
-feede

Question 5

The temperature rating of conductors must be selected and coordinated after consideration of the________ of any connected termination, conductor, or device.

Accepted Answer

A)  lowest temperature rating 
B)  highest temperature rating 
C)  current load 
D)  voltage load 
A)  lowest temperature rating 
B)  highest temperature rating 
C)  current load 
D)  voltage load

Question 6

Adjustments of the________ determine the degree of protection provided by the circuit breaker if a short circuit occurs.

Accepted Answer

A)  magnetic trip 
B)  double pole 
C)  triple pole 
D)  overcurrent 
A)  magnetic trip 
B)  double pole 
C)  triple pole 
D)  overcurrent

Question 7

For a three-pole circuit breaker, ________pole(s) is (are) required for each breaker used.

Accepted Answer

A)  one 
B)  two 
C)  three 
D)  four 
A)  one 
B)  two 
C)  three 
D)  four

Question 8

What should the selection of a circuit breaker be based on?

Accepted Answer

The selection of the circuit breaker sho

Question 9

If subfeed lugs are used, the electrician must ensure that the lugs are suitable for making________ .

Accepted Answer

A)  taps 
B)  multiple connections 
C)  one connection 
D)  lighting boards 
A)  taps 
B)  multiple connections 
C)  one connection 
D)  lighting boards

Question 10

The trip rating of the circuit breaker cannot exceed the ampacity of the________ in the panelboard.

Accepted Answer

A)  fuses 
B)  appliances 
C)  switches 
D)  busbars 
A)  fuses 
B)  appliances 
C)  switches 
D)  busbars

Question 11

The voltage ratings of the breakers must be higher than that of the system. Breakers are usually rated at 250 or________ volts.

Accepted Answer

A)  300 
B)  400 
C)  500 
D)  600 
A)  300 
B)  400 
C)  500 
D)  600

Question 12

Panelboards are available with standard main ratings of 100, 225, 400, 600, 800, and ________amperes.

Accepted Answer

A)  900 
B)  1000 
C)  1100 
D)  1200 
A)  900 
B)  1000 
C)  1100 
D)  1200

Question 13

If there is any question as to the exact value of the short-circuit current available at a point, a circuit breaker with________ interrupt rating is to be installed.

Accepted Answer

A)  no 
B)  low 
C)  medium 
D)  high 
A)  no 
B)  low 
C)  medium 
D)  high

Question 14

As a general rule, a panelboard for which more than 10 percent of its overcurrent devices are rated at ________amperes or less, and for which neutral connections are provided, is defined as a lighting and appliance branch-circuit panelboard.

Accepted Answer

A)  10 
B)  20 
C)  30 
D)  40 
A)  10 
B)  20 
C)  30 
D)  40

Question 15

When a subfeeder serves more than one panelboard, then connections must be made in the subfeeder for________ .

Accepted Answer

A)  each panelboard 
B)  every other panelboard 
C)  each set of three panelboards 
D)  each set of four panelboards 
A)  each panelboard 
B)  every other panelboard 
C)  each set of three panelboards 
D)  each set of four panelboards

Question 16

Panelboards that are not lighting panelboards are known as________ or distribution panelboards.

Accepted Answer

A)  circuit-breaker 
B)  power 
C)  fused 
D)  feeder 
A)  circuit-breaker 
B)  power 
C)  fused 
D)  feeder

Question 17

In general, in a circuit breaker, a low setting may be________ times the overload rating.

Accepted Answer

A)  two to four 
B)  six to eight 
C)  ten to twelve 
D)  fourteen to sixteen 
A)  two to four 
B)  six to eight 
C)  ten to twelve 
D)  fourteen to sixteen

Question 18

What rules should be followed to set the magnetic trip?

Accepted Answer

Two rules should be followed whenever th

Question 19

Briefly discuss panelboard installations that do not require a main protective device and then outline situations in which individual protection is required.

Accepted Answer

Panelboards are available with standard

Question 20

The main for a panelboard may be either a(n) ________or a circuit breaker.

Accepted Answer

A)  fuse 
B)  appliance 
C)  busbar 
D)  pole 
A)  fuse 
B)  appliance 
C)  busbar 
D)  pole

Exam 4: Panelboards

Two single-pole breakers require installation space________ that of a double-pole breaker.

Circuit control and________ protection must be provided for all circuits and the power-consuming devices connected to these circuits.

What requirements should be followed for lighting and appliance panelboards?

When planning or diagramming a floor-mounted transformer supplying a power panelboard, what are important components to include?

The temperature rating of conductors must be selected and coordinated after consideration of the________ of any connected termination, conductor, or device.

Adjustments of the________ determine the degree of protection provided by the circuit breaker if a short circuit occurs.

For a three-pole circuit breaker, ________pole(s) is (are) required for each breaker used.

What should the selection of a circuit breaker be based on?

If subfeed lugs are used, the electrician must ensure that the lugs are suitable for making________ .

The trip rating of the circuit breaker cannot exceed the ampacity of the________ in the panelboard.

The voltage ratings of the breakers must be higher than that of the system. Breakers are usually rated at 250 or________ volts.

Panelboards are available with standard main ratings of 100, 225, 400, 600, 800, and ________amperes.

If there is any question as to the exact value of the short-circuit current available at a point, a circuit breaker with________ interrupt rating is to be installed.

As a general rule, a panelboard for which more than 10 percent of its overcurrent devices are rated at ________amperes or less, and for which neutral connections are provided, is defined as a lighting and appliance branch-circuit panelboard.

When a subfeeder serves more than one panelboard, then connections must be made in the subfeeder for________ .

Panelboards that are not lighting panelboards are known as________ or distribution panelboards.

In general, in a circuit breaker, a low setting may be________ times the overload rating.

What rules should be followed to set the magnetic trip?

Briefly discuss panelboard installations that do not require a main protective device and then outline situations in which individual protection is required.

The main for a panelboard may be either a(n) ________or a circuit breaker.

Plans and Sitework

The Unit Substation

Feeder Bus System

Trolley Busways

Using Wire Tables and Determining Conductor Sizes

Signaling Systems

Basic Motor Controls

Motors and Controllers

Motor Installation

Power Factor

Ventilating, Air Conditioning, and Other Facilities

System Protection

Lightning Protection

Luminaires

Site Lighting

Programmable Logic Controllers

Developing a Program for a Plc

Fiber Optics

Hazardous Locations

Harmonics

Filters