Code, Standards, and Practices 1, Based on the 2020 NEC Online Materials: Lesson 3 Understanding and Applying Article 110 of the NEC

Question 1

NEC 110.12(B) warns against the possible damage to electrical equipment due to paint, plaster, cleaners, abrasives, or corrosive residues.
Select one:
True
False

Answer 1

True

Question 2

NEC 110.12(B) warns against the possible damage to electrical equipment due to paint, plaster, cleaners, abrasives, or corrosive residues.
Select one:
True
False

Answer 2

True

Question 3

When the term voltage is used throughout the Code, it means the voltage at which the circuit ? .

a. is approved
b. is protected from overcurrent
c. is rated
d. operates

Answer 3

operates

Question 4

One of the ways that conductor sizes are expressed in the NEC is by using ? .
a. American Wire Gage or circular-mils
b. resistance or Ω
c. square-mils
d. color of conductor insulation

Answer 4

American Wire Gage or circular-mils

Question 5

Electrical equipment shall be installed in a neat and workmanlike manner.
a. True
b. False

Answer 5

True

Question 6

A piece of electrical equipment with a UL label on it shall be installed in accordance with any ? included in the listing or labeling.
a. field marks
b. hardware
c. instructions
d. lists

Answer 6

instructions

Question 7

When the word conductor is not identified with a material, it indicates the use of ? .
a. aluminum
b. aluminum or copper-clad aluminum
c. copper
d. copper, aluminum, or copper-clad aluminum

Answer 7

c. copper

Question 8

Manufacturers are required to mark their products so the manufacturer can be identified. The marking may consist of manufacturer’s ? .
a. information about the material the product is made of
b. name and information about the material the product is made of
c. trademark
d. trademark or name

Answer 8

trademark or name

Question 9

Which of the following is/are required relating to the general requirement for identification of a disconnecting means that is not located and arranged so that its purpose is evident?
Select one:

a.
Each disconnecting means must be legibly marked to indicate its purpose.

b.
The marking must be of sufficient durability to withstand the environment involved.

c.
Both a. and b.

d.
Neither a. nor b.

Answer 9

Both a. and b.

Question 10

Unused openings in boxes are generally required to be ? .
a. approved
b. closed
c. identified
d. used

Answer 10

closed

Question 11

The width of the working space in front of electrical equipment 1,000 volts or less shall ? .

I. allow at least a 90° opening of equipment doors
II. allow at least a 180° opening of all equipment doors
III. not be less than 30” wide or the width of the equipment (whichever is greater)
IV. not be less than 36” wide or the width of the equipment (whichever is greater)

a. I. only
b. I. and III.
c. II. and IV.
d. III. only

Answer 11

i and iii

Question 12

NEC 110.14(B) requires a splice in a conductor to be covered with an insulation ? .
Select one:

a.
as thick as the conductor’s insulation

b.
equivalent to the conductor’s insulation or with an identified insulation device

c.
of the same material as the conductor

d.
thicker than the conductor’s insulation

Answer 12

equivalent to the conductor’s insulation or with an identified insulation device

Question 13

Which statement(s) is/are true according to NEC 110.14(A) for terminals?
Select one:

a.
Terminals for more than one conductor shall be so identified.

b.
Terminals used to connect aluminum conductors shall be so identified.

c.
Both a. and b.

d.
Neither a. nor b.

Answer 13

Both a. and b.

Question 14

Which statement(s) is/are true according to NEC 110.13(A) and (B)?
Select one:

a.
Electrical equipment provided with ventilating openings shall be installed so that the ventilated openings are not obstructed.

b.
Electrical equipment shall be firmly secured to the surface on which it is mounted.

c.
Both a. and b.

d.
Neither a. nor b.

Answer 14

Both a. and b.

Question 15

The temperature rating associated with the ampacity of a conductor shall be so selected and coordinated as to not exceed the lowest temperature rating of any connected ? .
a. conductor
b. termination
c. device
d. all of the above

Answer 15

all of the above

Question 16

On a 4-wire, delta-connected system where the midpoint of one phase winding is grounded to supply lighting and similar loads, the conductor or busbar having the higher phase voltage to ground shall be durably and permanently marked by an outer finish that is ? in color or by other effective means.
a. green
b. light blue
c. orange
d. red

Answer 16

orange

Question 17

Electrical equipment such as switchboards, switchgear, panelboards, industrial control panels, meter socket enclosures, and motor control centers, that is in other than dwelling units, and is likely to require examination, adjustment, servicing, or maintenance while energized, shall be ? to warn qualified persons of potential electric arc flash hazards.
a. engraved
b. field or factory marked
c. identified
d. marked

Answer 17

field or factory marked

Question 18

Each disconnecting means shall be legibly ? to indicate its purpose unless located and arranged so the purpose is evident.
a. engraved
b. field marked
c. identified
d. marked

Answer 18

marked

Question 19

Why does the NEC specify that sufficient access and working space shall be provided and maintained about all electric equipment?
a. To permit cleaning crews safe access around the electrical equipment
b. To permit ready and safe operation and maintenance of such equipment
c. To permit safe operation at 1,000 V and above
d. To permit safe operation at 1,000 V, nominal, or less

Answer 19

To permit ready and safe operation and maintenance of such equipment

Question 20

For equipment rated ? or more and over six feet wide, that contains overcurrent devices, switching devices, or control devices, there shall generally be one entrance to and egress from the required working space not less than 24 inches wide and 6 1/2 feet high at each end of the working space.
a. 200 A
b. 600 A
c. 1,200 A
d. 1,600 A

Answer 20

1,200 A

Question 21

All switchboards, switchgear, panelboards, and motor control centers shall generally be located in ? spaces and protected from damage.
a. accessible
b. dedicated
c. guarded
d. open

Answer 21

dedicated

Question 22

For electrical equipment rated 1,000 volts, nominal or less, the space equal to the width and depth of the equipment and extending from the floor to a height of ? above the equipment or to the structural ceiling, whichever is lower, shall generally be dedicated to the electrical installation.
a. 6’
b. 10’
c. 25’
d. 30’

Answer 22

6’

Question 23

In general, the Code requires that live parts of electrical equipment operating at ? to 1,000 volts, nominal, shall be guarded against accidental contact.
a. 24 V
b. 50 V
c. 120 V
d. 600 V

Answer 23

50 V

Question 24

Service equipment at other than dwelling units shall be legibly marked in the field with the available fault current. The field marking(s) shall include ? and be of sufficient durability to withstand the environment involved.
a. the date the calculation was performed
b. the date the fault-current calculation was performed
c. the name of the engineer or engineering firm that performed the calculation
d. the name of the individual that performed the calculation

Answer 24

the date the fault-current calculation was performed