Question 1

Explain why particular care has to be taken when making aluminum wiring connections.

Accepted Answer

When aluminum is exposed to air it oxidi...

Question 2

Although old fashioned knob-and-tube wiring is no longer used for new construction, NEC Article ____________________ applies when this wiring method is encountered during remodeling work.

Accepted Answer

The answer of Although old fashioned knob-and-tube wiring is no...

Question 3

If the 1-1/4 in. (32 mm) distance from the edge of the hole to the edge of the framing member cannot be maintained, what thickness of steel plate must be used to protect the cable?

Accepted Answer

The steel plate must...

Question 4

Lengths of flexible metal conduit longer than ____________________ feet are not acceptable as an equipment grounding conductor. In such cases a separate bonding jumper is required to run outside of the flexible conduit to maintain the continuity of the grounding path.

Accepted Answer

The answer of Lengths of flexible metal conduit longer than...

Question 5

The National Electrical Code does NOT allow rigid PVC conduit to ____.

Accepted Answer

A)   be installed concealed
B)   support lighting fixtures
C)   support conduit bodies
D)   be used in damp and wet locationsE) None of the above
F) B) and C)

Question 6

Connectors marked ____ are suitable for use with aluminum, copper, or copper-clad conductors.

Accepted Answer

A)   CO-ALR
B)   AL/CU
C)   UL 9
D)   both a and bE) All of the above
F) A) and D)

Question 7

The suffix "B" in Type NM-B nonmetallic cable means that the conductors have an insulation temperature rated ____.

Accepted Answer

A)   30°C (86°F) 
B)   60°C (140°F) 
C)   75°C (167°F) 
D)   90°C (194°F) E) A) and B)
F) A) and C) D

Question 8

The NEC in Table 210.24 shows that the minimum conductor size for branchcircuit wiring is ____.

Accepted Answer

A)   20 AWG
B)   18 AWG
C)   16 AWG
D)   14 AWGE) None of the above
F) A) and D)

Question 9

Match the following conductor insulations with their temperature rating.
-Type THWN

Accepted Answer

A)  60°C
B)  75°C
C)  90°CD) A) and C)
E) A) and B)

Question 10

When fire stopping material is used where more than ____________________ nonmetallic sheathed cables pass through wood framing members, their ampacities must be adjusted, according to 310.15(B)(3)(a).

Accepted Answer

The answer of When fire stopping material is used where...

Question 11

For a given conductor size, which material has the greatest ampacity?

Accepted Answer

A)   copper
B)   copper-clad aluminum
C)   aluminum
D)   both b and cE) B) and D)
F) None of the above A

Question 12

Nonmetallic-sheathed cable is manufactured with copper conductors ranging in size from ____________________ AWG to ____________________ AWG and with aluminum or copper-clad aluminum conductors ranging in size from ____________________ AWG to ____________________ AWG.

Accepted Answer

14 2 12 2
fourteen t...

Question 13

When a 4 ft. piece of nonmetallic-sheathed cable is used as a fixture whip above an accessible ceiling, it ____.

Accepted Answer

A)   is not required to be secured
B)   may be up to six feet in length
C)   is required to be plenum-rated
D)   is subject to all of the above requirementsE) All of the above
F) A) and B)

Question 14

When Type NM cable is run through holes in metal framing members, ____________________ must be provided to protect the cable from sharp metal edges.

Accepted Answer

The answer of When Type NM cable is run through...

Question 15

Describe at least three effects of voltage drop in residences.

Accepted Answer

Voltage drop causes lights to ...

Question 16

The NEC specifies that 60°C ampacity be used for circuits rated 100 amperes or less, except when the equipment terminals are marked for use with higher temperature wire. What is one potential problem with using higher-temperature, higher-ampacity wire?

Accepted Answer

Using higher-ampacity wire rat...

Question 17

Liquidtight flexible nonmetallic conduit is subject to which of the following limitations?

Accepted Answer

A)   cannot be used in direct sunlight, unless marked for this application
B)   can become brittle in extremely cold temperatures
C)   both of theseD) A) and C)
E) B) and C)

Question 18

The NEC requires that conductors 8 AWG and larger must be ____ when installed in a raceway.

Accepted Answer

A)   grounded
B)   bonded
C)   stranded
D)   none of theseE) None of the above
F) All of the above

Question 19

Older electrical books and plans sometimes use the term "MCM," which means the same thing as ____.

Accepted Answer

A)   metric
B)   kcmil
C)   A.I.C.
D)   GFCIE) B) and C)
F) None of the above B

Question 20

Branch circuit conductors shall have an ampacity ____ the maximum to be served.

Accepted Answer

A)   one-fourth
B)   one-half
C)   not less than
D)   125% greater thanE) A) and B)
F) All of the above

Exam 4: Conductor Sizes and Types, Wiring Methods, Wire Connections, Voltage Drop, Neutral Conductor Sizing for Services

Explain why particular care has to be taken when making aluminum wiring connections.

Correct AnswerverifiedWhen aluminum is exposed to air it oxidi...View AnswerShow Answer

Although old fashioned knob-and-tube wiring is no longer used for new construction, NEC Article ____________________ applies when this wiring method is encountered during remodeling work.

Correct AnswerverifiedShow Answer

If the 1-1/4 in. (32 mm) distance from the edge of the hole to the edge of the framing member cannot be maintained, what thickness of steel plate must be used to protect the cable?

Correct AnswerverifiedThe steel plate must...View AnswerShow Answer

Lengths of flexible metal conduit longer than ____________________ feet are not acceptable as an equipment grounding conductor. In such cases a separate bonding jumper is required to run outside of the flexible conduit to maintain the continuity of the grounding path.

Correct AnswerverifiedShow Answer

The National Electrical Code does NOT allow rigid PVC conduit to ____.

Correct AnswerverifiedShow Answer

Connectors marked ____ are suitable for use with aluminum, copper, or copper-clad conductors.

Correct AnswerverifiedShow Answer

The suffix "B" in Type NM-B nonmetallic cable means that the conductors have an insulation temperature rated ____.

Correct AnswerverifiedD

The NEC in Table 210.24 shows that the minimum conductor size for branchcircuit wiring is ____.

Correct AnswerverifiedShow Answer

Match the following conductor insulations with their temperature rating. -Type THWN

Correct AnswerverifiedShow Answer

When fire stopping material is used where more than ____________________ nonmetallic sheathed cables pass through wood framing members, their ampacities must be adjusted, according to 310.15(B)(3)(a).

Correct AnswerverifiedShow Answer

For a given conductor size, which material has the greatest ampacity?

Correct AnswerverifiedA

Nonmetallic-sheathed cable is manufactured with copper conductors ranging in size from ____________________ AWG to ____________________ AWG and with aluminum or copper-clad aluminum conductors ranging in size from ____________________ AWG to ____________________ AWG.

Correct Answerverified14 2 12 2fourteen t...View AnswerShow Answer

When a 4 ft. piece of nonmetallic-sheathed cable is used as a fixture whip above an accessible ceiling, it ____.

Correct AnswerverifiedShow Answer

When Type NM cable is run through holes in metal framing members, ____________________ must be provided to protect the cable from sharp metal edges.

Correct AnswerverifiedShow Answer

Describe at least three effects of voltage drop in residences.

Correct AnswerverifiedVoltage drop causes lights to ...View AnswerShow Answer

The NEC specifies that 60°C ampacity be used for circuits rated 100 amperes or less, except when the equipment terminals are marked for use with higher temperature wire. What is one potential problem with using higher-temperature, higher-ampacity wire?

Correct AnswerverifiedUsing higher-ampacity wire rat...View AnswerShow Answer

Liquidtight flexible nonmetallic conduit is subject to which of the following limitations?

Correct AnswerverifiedShow Answer

The NEC requires that conductors 8 AWG and larger must be ____ when installed in a raceway.

Correct AnswerverifiedShow Answer

Older electrical books and plans sometimes use the term "MCM," which means the same thing as ____.

Correct AnswerverifiedB

Branch circuit conductors shall have an ampacity ____ the maximum to be served.

Correct AnswerverifiedShow Answer

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When aluminum is exposed to air it oxidi...
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The steel plate must...
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D

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A

Nonmetallic-sheathed cable is manufactured with copper conductors ranging in size from AWG to AWG and with aluminum or copper-clad aluminum conductors ranging in size from AWG to AWG.

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14 2 12 2
fourteen t...
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Voltage drop causes lights to ...
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Using higher-ampacity wire rat...
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B

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