Code, Standards, and Practices 1, Based on the 2020 NEC Online Materials: Lesson 5 General Building Wire Properties and the NEC

Question 1

A ? is a slender filament of drawn metal.
Select one:

a.
cable

b.
conductor

c.
conduit

d.
wire

Answer 1

wire

Question 2

The purpose of the conductor is to furnish a path for the flow of electrons.
Select one:
True
False

Answer 2

True

Question 3

Conductance is the ? with which a material will conduct electricity.
Select one:

a.
ease

b.
difficulty

Answer 3

ease

Question 4

A good conductor is a material that will contain many ? .
Select one:

a.
bound electrons

b.
floating electrons

c.
free electrons

d.
inner electrons

Answer 4

free electrons

Question 5

A conductor is a single wire or combination of strands of wire not insulated from one another and capable of carrying an electrical current.
Select one:
True
False

Answer 5

True

Question 6

There is no perfect conductor, as all materials offer some opposition to the electron flow.
Select one:
True
False

Answer 6

True

Question 7

NEC 310.3(C) generally requires that conductors, where they are installed in raceways, shall be stranded when the conductor size is ? or larger.
Select one:

a.
10 AWG

b.
8 AWG

c.
6 AWG

d.
none of the above

Answer 7

8 AWG

Question 8

Steel conduit ? conduct electricity.
Select one:

a.
will

b.
will not

Answer 8

will

Question 9

A hard-drawn solid copper conductor will have ? tensile strength than a soft-drawn copper conductor.
Select one:

a.
less

b.
more

Answer 9

more

Question 10

Which statement(s) is/are true, when comparing copper conductors to aluminum conductors?
Select one:

a.
Aluminum has a higher melting point than copper.

b.
Copper has a higher tensile strength than aluminum.

c.
Both a. and b.

d.
Neither a. nor b.

Answer 10

Copper has a higher tensile strength than aluminum.

Question 11

The title of Article 310 of the NEC is ? .
Select one:

a.
Cabinets, Cutout Boxes, and Meter Sockets

b.
Conductors for General Wiring

c.
Wiring Methods

d.
Wiring Methods and Materials

Answer 11

Conductors for General Wiring

Question 12

Which of the following is not a metal material recognized by the Code in 311.12(B) for electrical conductors?
Select one:

a.
Aluminum

b.
Copper

c.
Copper-clad aluminum

d.
Silver

Answer 12

Silver

Question 13

According to Section 110.5, when the Code refers only to a conductor size and the material of the conductor is not specified, the Code intends the use of ? .
Select one:

a.
aluminum

b.
aluminum, copper-clad aluminum or copper

c.
copper

d.
copper or aluminum

Answer 13

copper

Question 14

Aluminum conductors are terminated in a switch with the use of copper lugs. According to Section 110.14, this is generally ? .
Select one:

a.
acceptable

b.
a violation

Answer 14

a violation

Question 15

The cross-sectional area of a solid, copper-clad aluminum conductor must contain a minimum of ? copper.
Select one:

a.
2%

b.
5%

c.
10%

d.
15%

Answer 15

10%

Question 16

NEC Section 310.3(A) establishes the minimum size conductors generally permitted to be used for voltage ratings up to and including 2,000 volts as ? copper or ? aluminum.
Select one:

a.
16 AWG / 14 AWG

b.
14 AWG / 12 AWG

c.
12 AWG / 14 AWG

d.
12 AWG / 12 AWG

Answer 16

14 AWG / 12 AWG

Question 17

Steel conduit may be used as an equipment grounding conductor as it is capable of conducting electrons under fault conditions.
Select one:
True
False

Answer 17

True

Question 18

Which statement(s) is/are true when silver is used as a conductor?
Select one:

a.
Care must be taken when working with silver-plated contacts.

b.
Silver is a better conductor than copper.

c.
Both a. and b.

d.
Neither a. nor b.

Answer 18

Both a. and b.

Question 19

A stranded conductor used as a single conductor is often referred to as a ? .
Select one:

a.
cable

b.
conductor

c.
wire

d.
none of the above

Answer 19

cable

Question 20

A multiple conductor cable is a combination of two or more insulated conductors under a common jacket.
Select one:
True
False

Answer 20

True

Question 21

This question is based on Table 8, Chapter 9, of the NEC, titled “Conductor Properties.” Ohm/kFT, as used in Table 8, means ohms per one thousand feet.

Table 8 has a different resistance listing for a solid and a stranded 10 AWG copper conductor.
Select one:
True
False

Answer 21

True

Question 22

This question is based on Table 8, Chapter 9, of the NEC, titled “Conductor Properties.” Ohm/1,000 ft., as used in Table 8, means ohms per one thousand feet.

The resistance of a stranded, 8 AWG copper conductor is slightly ? than a solid conductor.
Select one:

a.
less

b.
more

Answer 22

more

Question 23

This question is based on Table 8, Chapter 9, of the NEC, titled “Conductor Properties.” Ohm/1,000 ft., as used in Table 8, means ohms per one thousand feet.

How many strands of wire are used in the makeup of 6 AWG stranded conductor?
Select one:

a.
1

b.
7

c.
19

d.
37

e.
61

Answer 23

7

Question 24

This question is based on Table 8, Chapter 9, of the NEC, titled “Conductor Properties.” Ohm/1,000 ft., as used in Table 8, means ohms per one thousand feet.

How many strands of wire are used in the makeup of 1 AWG stranded conductor?
Select one:

a.
1

b.
7

c.
19

d.
37

e.
61

Answer 24

19

Question 25

This question is based on Table 8, Chapter 9, of the NEC, titled “Conductor Properties.” Ohm/1,000 ft., as used in Table 8, means ohms per one thousand feet.

How many strands of wire are used in the makeup of 4/0 AWG stranded conductor?
Select one:

a.
1

b.
7

c.
19

d.
37

e.
61

Answer 25

19

Question 26

This question is based on Table 8, Chapter 9, of the NEC, titled “Conductor Properties.” Ohm/1,000 ft., as used in Table 8, means ohms per one thousand feet.

How many strands of wire are used in the makeup of 500 kcmil stranded conductor?
Select one:

a.
1

b.
7

c.
19

d.
37

e.
61

Answer 26

37

Question 27

This question is based on Table 8, Chapter 9, of the NEC, titled “Conductor Properties.” Ohm/1,000 ft., as used in Table 8, means ohms per one thousand feet.

What is the resistance per 1,000 feet of 8 AWG copper uncoated, stranded conductors?
Select one:

a.
0.308

b.
0.321

c.
0.778

d.
0.809

e.
1.28

Answer 27

0.778

Question 28

This question is based on Table 8, Chapter 9, of the NEC, titled “Conductor Properties.” Ohm/1,000 ft., as used in Table 8, means ohms per one thousand feet.

What is the resistance per 1,000 feet of 8 AWG aluminum stranded conductors?
Select one:

a.
0.308

b.
0.321

c.
0.778

d.
0.809

e.
1.28

Answer 28

1.28