Question 1

A circular mil is the ____ of the wire in mils squared.
A) area
B) circumference
C) diameter
D) radius

Accepted Answer

C

Question 2

A device that measures insulation resistance in millions of ohms is called a(n) ____.
A) ammeter
B) megger
C) voltmeter
D) wattmeter

Accepted Answer

A megger is a specialized device used for measuring very high insulation resistance, typically in the range of millions of ohms. An ammeter is used for measuring current, a voltmeter for measuring voltage, and a wattmeter for measuring power.

Question 3

Which of the following conditions must be met before conductors are permitted by the NEC to be run in parallel?
A) The conductors must be the same length
B) One conductor must be copper and the other must be aluminum
C) The conductors must have the same circular mil area
D) All of the above
E) a and c only

Accepted Answer

The NEC permits conductors to be run in parallel only if they have the same circular mil area. The requirement for conductors to be the same length is not necessary for parallel installations. While copper and aluminum conductors can be connected in parallel, it is not a requirement for such installations. Therefore, the correct choice is E, as it includes the necessary condition for parallel installations (same circular mil area) and excludes unnecessary conditions (same length and copper/aluminum combination).

Question 4

When determining the conductor size for a particular application, you are determining the maximum current a conductor can carry.

Accepted Answer

The answer of When determining the conductor size for a...

Question 5

A location that is subject to saturation by water is called a ____ location.
A) damp
B) dry
C) wet

Accepted Answer

A wet location is where water can accumulate or saturate the ground. A damp location is typically a location with high humidity or moisture content but may not necessarily be saturated with water. A dry location is typically a location that is not subject to water infiltration or saturation.

Question 6

When selecting conductors for a particular application, the ambient temperature correction factors note need not be considered.

Accepted Answer

Ambient temperature correction factors should be considered when selecting conductors for a particular application as they can affect the ampacity of the conductor.

Question 7

The maximum amount of voltage drop permitted in a circuit is ____% of the applied voltage.
A) 0
B) 3
C) 6
D) 9

Accepted Answer

The maximum amount of voltage drop permitted in most circuits is 3% of the applied voltage, to ensure efficient operation and to minimize potential issues related to excessive voltage drop.

Question 8

Which of the following are included in NEC Table 310.13?
A) Insulation trade name
B) Conductor identification code letter
C) Maximum operating temperature of the conductor
D) All of the above
E) a and c only

Accepted Answer

NEC Table 310.13 includes information such as insulation trade name, conductor identification code letter, and maximum operating temperature of the conductor, among other details related to conductors.

Question 9

The conductors listed in NEC Tables 310.18 and 310.19 are generally used for ____ temperature locations.
A) high
B) low
C) all
D) cold

Accepted Answer

The conductors in NEC Tables 310.18 and 310.19 are designed for high temperature locations, as they are rated for higher temperature conditions.

Question 10

A location that is not normally subject to dampness or wetness is called a ____ location.
A) damp
B) dry
C) wet

Accepted Answer

The term "not normally subject to dampness or wetness" implies that the location is usually dry, making choice B the most appropriate option.

Question 11

When using a megger to test a circuit for grounds or shorts, the meter should be set ____.
A) lower than the circuit voltage
B) at the circuit voltage
C) slightly higher than the circuit voltage
D) a and b only
E) b and c only

Accepted Answer

Meggers are designed to test insulation resistance by applying a voltage higher than the circuit's normal operating level, hence options B and C are correct. Applying a voltage at or slightly higher than the circuit voltage helps in accurately determining the insulation's ability to withstand operational or higher stresses.

Question 12

A location that is covered and not likely to be saturated by water is a ____ location.
A) damp
B) dry
C) wet

Accepted Answer

The answer of A location that is covered and not...

Question 13

When determining conductor size for an area where ambient temperature is a concern, you must divide the needed current by the correction factor.

Accepted Answer

This statement is true. When ambient temperature affects the ampacity of a conductor, a correction factor (also known as derating factor) must be applied to determine the correct conductor size. The correction factor takes into account the maximum allowable temperature for the conductor insulation and the actual ambient temperature of the installation site. The corrected ampacity value is then used to size the conductor based on the maximum allowable voltage drop, among other factors.

Question 14

NEC® 110.14(C) states that the temperature rating of a conductor must be selected so as not to exceed the lowest temperature rating of any connected conductor, termination or device.

Accepted Answer

NEC® 110.14(C) does state that the temperature rating of a conductor must not exceed the lowest temperature rating of any connected conductor, termination or device.

Question 15

When a three-phase installation is to be run in conduit, the power conductors ____.
A) must be run with each phase in its own conduit
B) must be run with one phase in each conduit
C) can be run in any manner

Accepted Answer

The answer of When a three-phase installation is to be...

Question 16

In some cases, such as for long wire runs or for the windings of transformers and motors, the electrician must be able to determine the correct conductor size by computing the ____ of the conductor.
A) wattage
B) maximum voltage drop
C) resistance
D) both b and c

Accepted Answer

In order to determine the correct conductor size for long wire runs or windings of transformers and motors, an electrician must calculate both the maximum voltage drop and the resistance of the conductor to ensure that it is capable of carrying the necessary current without overheating or causing other issues.

Question 17

Article ____ of the National Electrical Code deals with conductors used for general wiring.
A) 210
B) 250
C) 310
D) 410

Accepted Answer

Article 310 of the National Electrical Code (NEC) specifically deals with conductors for general wiring, including their specifications, types, and uses.

Question 18

A megohmmeter can produce voltages that range from 250 V to ____ V.
A) 5,000
B) 10,000
C) 25,000
D) 50,000

Accepted Answer

Megohmmeters typically produce voltages ranging from 250 V to 5,000 V for insulation resistance testing.

Question 19

The temperature coefficient can be used to determine the resistance of a material at different temperatures.

Accepted Answer

The temperature coefficient is a measure of how much the resistance of a material changes with temperature. By knowing the temperature coefficient, the resistance of the material can be calculated at different temperatures.

Question 20

Which of the following conductors has the least resistance per mil foot at 20 degrees C?
A) Aluminum
B) Copper
C) Gold
D) Silver

Accepted Answer

Silver has the least resistance per mil foot at 20 degrees C compared to aluminum, copper, and gold. This is because silver has the highest conductivity among common metals, allowing for better flow of electricity with less resistance.

Quiz 9: Using Wire Tables and Determining Conductor Sizes

A circular mil is the ____ of the wire in mils squared.

A device that measures insulation resistance in millions of ohms is called a(n) ____.

Which of the following conditions must be met before conductors are permitted by the NEC to be run in parallel?

When determining the conductor size for a particular application, you are determining the maximum current a conductor can carry.

A location that is subject to saturation by water is called a ____ location.

When selecting conductors for a particular application, the ambient temperature correction factors note need not be considered.

The maximum amount of voltage drop permitted in a circuit is ____% of the applied voltage.

Which of the following are included in NEC Table 310.13?

The conductors listed in NEC Tables 310.18 and 310.19 are generally used for ____ temperature locations.

A location that is not normally subject to dampness or wetness is called a ____ location.

When using a megger to test a circuit for grounds or shorts, the meter should be set ____.

A location that is covered and not likely to be saturated by water is a ____ location.

When determining conductor size for an area where ambient temperature is a concern, you must divide the needed current by the correction factor.

NEC® 110.14(C) states that the temperature rating of a conductor must be selected so as not to exceed the lowest temperature rating of any connected conductor, termination or device.

When a three-phase installation is to be run in conduit, the power conductors ____.

In some cases, such as for long wire runs or for the windings of transformers and motors, the electrician must be able to determine the correct conductor size by computing the ____ of the conductor.

Article ____ of the National Electrical Code deals with conductors used for general wiring.

A megohmmeter can produce voltages that range from 250 V to ____ V.

The temperature coefficient can be used to determine the resistance of a material at different temperatures.

Which of the following conductors has the least resistance per mil foot at 20 degrees C?