Code, Standards, and Practices 1, Based on the 2020 NEC Online Materials: Lesson 8 General Requirements Related to Installing Wiring Devices

Question 1

Where the NEC uses the word approved related to installations of conductors and equipment, it is defined as acceptable to the ? .
Select one:

a.
authority having jurisdiction

b.
electrical contractor

c.
equipment listing agency

d.
owner

Answer 1

authority having jurisdiction

Question 2

Which of the following best defines the circuit conductors between the final overcurrent protective device and the outlet(s)?
Select one:

a.
Branch circuit

b.
Electrical wiring

c.
Feeder

d.
Supplemental branch circuit

Answer 2

Branch circuit

Question 3

A ? is generally not considered an outlet by the NEC.
Select one:

a.
box with a surge-protective device (SPD) receptacle

b.
device box with a 3-way switch

c.
device box with a duplex receptacle

d.
device box with a GFCI receptacle

Answer 3

device box with a 3-way switch

Question 4

Which of the following are common elements and considerations to all wiring device installations?
Select one:

a.
The finish cover or plate used

b.
The type of device box or box and plaster ring combination used

c.
The wiring method used

d.
All of the above

Answer 4

All of the above

Question 5

If the branch-circuit wiring in conduit to a receptacle is installed in the building walls, the wiring is considered to be ? .
Select one:

a.
concealed

b.
exposed

c.
finished

d.
inaccessible

Answer 5

concealed

Question 6

Boxes are generally required in branch-circuit wiring at ? .

a.
conductor splice points

b.
junction or pull points

c.
receptacle outlet and switch points

d.
all of the above

Answer 6

all of the above

Question 7

Boxes used for wiring devices such as switches and receptacles must provide ? support.
Select one:

a.
additional

b.
minimal

c.
structural

d.
substantial

Answer 7

substantial

Question 8

Specific receptacle and switch box mounting heights are required by the ? .
Select one:

a.
Americans with Disabilities Act Guidelines (ADA)

b.
International Residential Code

c.
National Electrical Code

d.
National Electrical Installation Standard

Answer 8

Americans with Disabilities Act Guidelines (ADA)

Question 9

Where a device box is installed in a wall or ceiling that has a finish surface made of gypsum wallboard, what is the maximum distance that the face of the box or plaster ring is permitted to be set back from the finish?
Select one:

a.
6 mm (1/4”)

b.
13 mm (1/2”)

c.
No set back permitted

d.
None of the above

Answer 9

6 mm (1/4”)

Question 10

The maximum gap permitted between drywall and the edge of a device box or plaster ring shall not be greater than ? .
Select one:

a.
3 mm (1/8”)

b.
6 mm (1/4”)

c.
50 mm (2”)

d.
100 mm (4”)

Answer 10

3 mm (1/8”)

Question 11

Where the branch-circuit wiring is installed (fished) in existing hollow spaces of walls or ceilings, the device boxes are required to be secured to the ? .
Select one:

a.
finished surface

b.
metal framing member of the wall or ceiling

c.
wood framing member of the wall or ceiling

d.
none of the above

Answer 11

finished surface

Question 12

Where branch-circuit conductors enter a standard single-gang device box, the minimum length of free conductor measured from the face of the box or plaster ring shall be not less than ? .
Select one:

a.
75 mm (3”)

b.
150 mm (6”)

c.
200 mm (8”)

d.
300 mm (12”)

Answer 12

75 mm (3”)

Question 13

When determining conductor fill (volume allowances) at device boxes, branch-circuit conductors that pass through a device box without a splice or termination are required to be counted in accordance with which of the following volume allowances?
Select one:

a.
All must be counted as one conductor.

b.
Each conductor must be counted once.

c.
They are not required to be counted.

d.
None of the above

Answer 13

Each conductor must be counted once.

Question 14

When conductors are pulled through a device box, what is the minimum length required for such conductors?
Select one:

a.
Not less than 75 mm (3”)

b.
Not less than 150 mm (6”)

c.
Not less than 200 mm (8”)

d.
Minimum length is not required.

Answer 14

Minimum length is not required.

Question 15

When a GFCI receptacle device is installed on a 20-ampere branch circuit (12 AWG copper), what is the minimum volume allowance (in cubic inches) required for conductor fill for each conductor in the outlet box?
Select one:

a.
2.25 in3

b.
4.00 in3

c.
4.50 in3

d.
5.00 in3

Answer 15

2.25 in3

Question 16

Where standard device boxes are used and all the conductors in the box are of the same size in AWG, which of the following NEC tables is permitted to be used to determine the minimum size required for the box?
Select one:

a.
Table 250.122

b.
Table 310.16

c.
Table 314.16(A)

d.
Table 400.4

Answer 16

Table 314.16(A)

Question 17

Where a multiwire branch circuit in a dwelling unit is connected to a duplex receptacle using an ungrounded (hot) conductor to each of the receptacles on the device (split-wired) and a common neutral conductor connected to the receptacle, which of the following is required?
Select one:

a.
A means to disconnect simultaneously all ungrounded conductors must be provided where the circuit originates.

b.
The overcurrent device(s) ahead of the circuit must not exceed 15 A.

c.
The receptacle must be identified for the purpose.

d.
The receptacle must be rated at 20 A.

Answer 17

A means to disconnect simultaneously all ungrounded conductors must be provided where the circuit originates.

Question 18

Branch-circuit conductors may be connected to the terminals of receptacle wiring devices by wrapping the conductor around the screw terminals of the device or by using “push-in” stabbing terminals on the device. What is the maximum size conductor permitted for devices where the “push-in” method is used?

a.
14 AWG copper (solid)

b.
12 AWG aluminum

c.
12 AWG copper

d.
10 AWG aluminum

Answer 18

14 AWG copper (solid)

Question 19

Terminals on receptacles intended for connection of grounded neutral conductors are required to be identified by which of the following methods?
Select one:

a.
A terminal that is metal or metal coated in a substantially white color

b.
The letter “W” adjacent to the identified terminal

c.
Where the terminal is not visible, the word “White” or “W” next to the hole for the grounded conductor or the entrance hole for the conductor shall be colored white

d.
Any of the above

Answer 19

Any of the above

Question 20

A ? is an acceptable means of identification of the equipment grounding conductor terminal on a duplex receptacle.
Select one:

a.
brass colored screw terminal on the receptacle

b.
terminal identified by a green-colored finish, the words “green” or “ground,” or the letters “G” or “GR,” or a grounding symbol

c.
terminal identified by a white color

d.
terminal that is hexagon in shape

Answer 20

terminal identified by a green-colored finish, the words “green” or “ground,” or the letters “G” or “GR,” or a grounding symbol

Question 21

The conductor used to connect from the equipment grounding conductors in a device outlet box to a grounding terminal of a grounding-type receptacle is a(n) ? .
Select one:

a.
equipment bonding jumper

b.
grounded conductor

c.
grounding conductor

d.
main bonding jumper

Answer 21

equipment bonding jumper

Question 22

Where a device box is fastened to a framing member and the screw or nail passes through the box, which of the following is an acceptable location for the screw or nail used to fasten the box?
Select one:

a.
It is not permitted to pass through the box.

b.
It is permitted, but must not be more than 6 mm (1/4”) from the back or end of the enclosure.

c.
It is permitted to pass through the box in any manner so as to not damage the conductors or device within the box or enclosure.

d.
It must pass through the box and be located not more than 25 mm (1”) from the back of the box.

Answer 22

It is permitted, but must not be more than 6 mm (1/4”) from the back or end of the enclosure.

Question 23

What is the maximum overcurrent protection rating for a circuit of 12 AWG THHN conductors (after any applicable correction factors) that originate from a circuit breaker in a panelboard and terminate directly on a 20-ampere receptacle? Note that the breaker and receptacle are not marked with temperature ratings.
Select one:

a.
15 A

b.
20 A

c.
25 A

d.
30 A

Answer 23

20 A

Question 24

What is the minimum size equipment-grounding conductor required for a branch circuit protected by an overcurrent device rated at 40 amperes supplying a range receptacle rated at 50 amperes?
Select one:

a.
12 AWG copper

b.
10 AWG aluminum

c.
10 AWG copper

d.
None of the above

Answer 24

10 AWG copper

Question 25

What is the minimum size equipment-bonding jumper used to connect a grounding-type receptacle to a grounded metal box where the branch circuit supplying the receptacle circuit is protected by a 30-ampere overcurrent protective device?
Select one:

a.
14 AWG copper

b.
12 AWG copper

c.
10 AWG aluminum

d.
10 AWG copper

Answer 25

10 AWG copper

Question 26

How many volume allowances must be taken for each device installed in an outlet box?
Select one:

a.
1

b.
2

c.
3

d.
4

Answer 26

2

Question 27

What is the minimum cubic inch capacity required for 12 AWG copper conductors in an outlet box?
Select one:

a.
1.75 in3

b.
2.00 in3

c.
2.25 in3

d.
2.50 in3

Answer 27

2.25 in3

Question 28

Where an outlet box (having no cable clamps) contains a receptacle and four 12-2 NM cables, what is the minimum cubic inch capacity required for the box?
Select one:

a.
18.0 in3

b.
21.5 in3

c.
24.75 in3

d.
30.0 in3

Answer 28

24.75 in3

Note: Type NM cable is required to contain an EGC per NEC 334.108.

Question 29

A device or utilization equipment wider than a single 50 millimeter (2 inch) device box as described in NEC Table 314.16(B)(4) shall have a ? volume allowance provided for each gang required for mounting the device.

a.
single

b.
double

c.
triple

d.
quadruple

Answer 29

double