Code, Standards, and Practices 1, Based on the 2020 NEC Online Materials: Lesson 11 Specific Switch Installation Requirements

Question 1

Which UL Standard is required to be used by qualified electrical testing laboratories to evaluate snap switches for electrical safety?
Select one:

a.
UL 20

b.
UL 467

c.
UL 498

d.
UL 891

Answer 1

UL 20

Question 2

A motor circuit switch is generally required to be rated in ? .
Select one:

a.
amperes

b.
horsepower

c.
locked rotor amperes

d.
voltage and short-circuit current

Answer 2

horsepower

Question 3

A general-use dimmer switch is generally only permitted to control ? .
Select one:

a.
ceiling-suspended paddle fans

b.
fluorescent luminaires

c.
incandescent luminaires

d.
standard duplex or single receptacles

Answer 3

incandescent luminaires

Question 4

Where the white or gray conductor of a cable assembly is used as a switch loop for circuits of 50 volts or more, the switch loop must be permanently reidentified as an ungrounded conductor by ? .
Select one:

a.
an effective means of any color

b.
marking tape, painting, or other effective means of a color other than white, gray, or green

c.
the use of gray or white paint

d.
the use of gray or white tape

Answer 4

marking tape, painting, or other effective means of a color other than white, gray, or green

Question 5

The white or gray conductor of a cable assembly, where used in switch loop wiring, is not permitted to be used as a ? .
Select one:

a.
return conductor from a switch to a switched outlet

b.
supply side of single pole switch

c.
supply side (point wire) of a 3-way switch

d.
none of the above

Answer 5

return conductor from a switch to a switched outlet

Question 6

A general-use snap switch used to supply a one-horsepower motor shall be permitted to control a load of not greater than ? .
Select one:

a.
50% of the rating of the switch

b.
80% of the ampere rating of the switch

c.
100% of the rating of the switch

d.
125% of the switch

Answer 6

80% of the ampere rating of the switch

Question 7

Where switches or other devices are ganged in a four-gang box, and the voltage between adjacent switches exceeds 300 volts, which of the following is required?
Select one:

a.
Each switch requires its own device box.

b.
Electrical tape is required around the device terminals.

c.
Permanently installed barriers are required between adjacent devices.

d.
Switches without screw terminals are required to be used.

Answer 7

Permanently installed barriers are required between adjacent devices.

Question 8

Switches are required to be marked in accordance with which of the following?
Select one:

a.
Hospital grade when used at patient bed locations in a critical-care area

b.
Ivory in color

c.
To indicate the load they serve

d.
Voltage and current ratings

Answer 8

Voltage and current ratings

Question 9

Generally, multipole switches are permitted for use only on ? circuits unless listed and marked for other than single circuit use.
Select one:

a.
277 V

b.
480 V

c.
multiple circuits where clearly identified in the field

d.
single

Answer 9

single

Question 10

? are generally required to be grounded.
Select one:

a.
Dimmer switches

b.
Fan controls and other similar switch controls

c.
Snap switches

d.
All of the above

Answer 10

All of the above

Question 11

Switch faceplates made of nonmetallic (insulating), noncombustible material must generally not be less than ? in thickness.

a.
0.76 mm (0.030”)

b.
1.02 mm (0.040”)

c.
2.54 mm (0.100”)

Answer 11

2.54 mm (0.100”)

Question 12

Where a snap switch is marked “CO/ALR,” it is suitable for use with which of the following types of conductors?

Select one:

a.
Aluminum conductors

b.
Copper conductor

c.
Copper-clad aluminum conductors

d.
All of the above

Answer 12

All of the above

Question 13

Snap switches with “push-in” terminal connection means are permitted for use with ? conductors.

Select one:

a.
aluminum

b.
solid copper

c.
stranded aluminum

d.
stranded copper

Answer 13

solid copper

Question 14

Switches marked with an off position are required to ? .
Select one:

a.
be capable of being locked in the open position

b.
completely disconnect all ungrounded conductors to the load they control

c.
partially disconnect the load they control

d.
none of the above

Answer 14

completely disconnect all ungrounded conductors to the load they control

Question 15

A general-use dimmer switch is required to be counted as ? where installed in a single-gang box on a circuit wired with 12 AWG copper conductors.

a.
1 conductor (2.25 in.3 total)

b.
2 conductors (4.00 in.3 total)

c.
2 conductors (4.50 in.3 total)

d.
3 conductors (2.25 in.3 total)

Answer 15

2 conductors (4.50 in.3 total)

Question 16

A 3-pole, general-use snap switch is generally permitted to be used to control ? .
Select one:

a.
multiple branch circuit where rated for the voltage applied

b.
multiple circuits where marked “three-circuit”

c.
3 circuits, all of different voltages

d.
3 separate circuits where properly rated

Answer 16

multiple circuits where marked “three-circuit”

Question 17

What is the minimum size copper equipment grounding conductor required for a 20-ampere lighting circuit?
Select one:

a.
14 AWG

b.
12 AWG

c.
10 AWG

d.
8 AWG

Answer 17

12 AWG

Question 18

What is the minimum size equipment bonding jumper required to be connected from a grounding terminal on a switch for a neon tubing outline lighting circuit protected at 30 amperes?
Select one:

a.
14 AWG copper

b.
12 AWG aluminum

c.
12 AWG copper

d.
10 AWG copper

Answer 18

10 AWG copper

Question 19

? locations in a dwelling unit do not require a switch-controlled lighting outlet.
Select one:

a.
Attached garage

b.
Bathroom

c.
Clothes closet

d.
Kitchen

Answer 19

Clothes closet

Question 20

Where an attic space contains equipment that requires servicing, such as an air conditioner, where is the switch for the required lighting outlet to be located?
Select one:

a.
At the air conditioner

b.
At the usual point of entry to the attic

c.
In the closet (where equipped with a pilot light)

d.
In the garage

Answer 20

At the usual point of entry to the attic

Question 21

Where a neon transformer for a sign is installed in a soffit location, where is the switch-controlled lighting outlet required to be located?
Select one:

a.
At or near the transformer(s)

b.
At the stairway below the access panel

c.
At the usual point of entry to the space

d.
On the roof

Answer 21

At or near the transformer(s)