Conductor Requirements

Question 1

most common conductor
materials used in building electrical wiring, although
other materials can be used.

Answer 1

Copper and aluminum

Question 2

are used in
small conductor sizes (up to about ______) because
safety issues associated with aluminum are avoided and
weight and cost are not significantly affected.

Answer 2

solid copper conductors, 8 AWG

Question 3

are widely used on
larger (above _____) circuits serving large motors,
equipment, and appliances

Answer 3

‘Stranded aluminum conductors, 30 A

Question 4

Electronic circuits and phone extensions

Answer 4

No. 20 AWG and smaller

Question 5

Light-gauge extension cords, lamp cords, door chime wiring, small appliance cords

Answer 5

No. 16 to 18 AWG

Question 6

Normal 15 A and 20 A branch circuits serving small appliances, convenience (receptacle) outlets,
and luminaires

Answer 6

No. 12 to 14 AWG

Question 7

Larger branch circuits at 30 A and above serving electrical appliances such as electric water heaters, clothes
dryers, air conditioning equipment, and water pumps

Answer 7

No. 4 to 10 AWG

Question 8

Residential and light commercial service entrance conductors and feeders to panelboards

Answer 8

No. 2 to 4/0 AWG

Question 9

Heavy commercial and industrial service entrance conductors, large feeders to closet transformers,
and panelboards

Answer 9

250 kcmil and larger

Question 10

covered with insulation to provide
electrical isolation and physical protection of the
conductor material.

Answer 10

Conductors

Question 11

determines the
environment in which a wire or cable can be used safely.

Answer 11

type of insulation material

Question 12

are used as a
covering for electric wires.

Answer 12

Insulators like plastic and
rubber

Question 13

may need to be adjusted with correction
factors when conditions related to the temperature of the
Surroundings and the number of conductors in a
raceway (e.g., conduit or cable) fall outside normal
operating ranges.

Answer 13

ampacity of a
conductor

Question 14

Armored cable with conductors having thermoset insulation. 194°F (90°C) temperature rating.

Answer 14

ACHH

Question 15

Armored cable with conductors having thermoplastic insulation. 167°F (75°C) temperature rating.

Answer 15

ACTH

Question 16

Armored cable with conductors having thermoplastic insulation. 194°F (90°C) temperature rating

Answer 16

ACTHH

Question 17

Non-metallic sheathed cable. 140°F (60°C) temperature rating. Approved for use in dry, interior residential wiring if properly
installed inside framed walls, floors, and ceilings. Not sunlight resistant.

Answer 17

NM

Question 18

Underground feeder. 140°F (60°C) temperature rating. Generally not sunlight resistant, unless marked.

Answer 18

UF

Question 19

Underground service entrance. 167°F (75°C) temperature rating, wet insulation rating, heat and moisture resistant. Sunlight
resistant.

Answer 19

USE

Question 20

Underground service entrance. 194°F (90°C) temperature rating, wet insulation rating. Heat and moisture resistant. Sunlight
resistant.

Answer 20

USE-2

Question 21

Use to convey power from the service drop to the meter base and from the meter base to the distribution panelboard.

Answer 21

cable

Question 22

__________ for each conductor size are for different
equipment terminal (where connections of wiring are
made) temperatures.

Answer 22

Ampacity values

Question 23

_______________ at the equipment terminals can damage
the conductors if it is not properly dissipated.

Answer 23

Heat generated

Question 24

is the temperature of a
Surrounding medium (e.g., air, Soil).

Answer 24

Ambient temperature

Question 25

As ambient temperature rises, less current generated heat is needed to reach the temperature rating of the insulation. Therefore, ampacity is governed’ by contribution of ambient heat.

Answer 25

TRUE

Question 26

refers to the normal temperature range in the environment in which that conductor is to be used (e.g., the temperature of the Surrounding air, water, or earth).

Answer 26

ambient temperature rating

Question 27

adjusted for changes in ambient temperature, including temperatures below 78°F (26°C) and above 86°F (30°C).

Answer 27

Conductor ampacity

Question 28

applied based on the ambient temperature of the conductor

Answer 28

temperature correction factor (F, )

Question 29

When several current-carrying conductors’ are contained in a ___________, the temperature of the conductors will increase under ______________

Answer 29

raceway or cable, normal loading conditions.

Question 30

must be applied for four or more conductors in a raceway or cable installed in the same raceway or conduit or any bundled cables that are more than ____________.

Answer 30

bundling correction factor (Fy) , 24 in (0.63 m) long.

Question 31

In addition to ampacity requirements, _________ and _________ should be analyzed for voltage drop because of the adverse effect it can have on performance and operating life of appliances and equipment.

Answer 31

branch circuits, feeders

Question 32

Total voltage drop in the feeders and branch circuits should not exceed ____.

Answer 32

5%

Question 33

The percentage of voltage drop is determined by the ratio of ________ and __________.

Answer 33

ratio of voltage drop, system voltage

Question 34

The basic formula for determining voltage drop (Edrop) in a two-wire AC circuit or three-wire AC single-phase circuit with a balanced load at 100% power factor (neglecting reactance) is based on the ____________, in feet or meters; __________, in Q/1000 ft or Q/1000 m; and ____________ in amperes:

Answer 34

one-way circuit length (L), conductor resistance (R), the circuit load

Question 35

In SI (metric) computations, substitute the constant 70.8 for ____ and 118 for ___ to find length (L) in meters.

Answer 35

21.6, 36

Question 36

In SI (metric) computations, substitute the constant 61.3 for _____ and 102.2 for _____ to find length (L) in meters.

Answer 36

18.7, 31.2

Question 37

_________ on small- and medium-size conductors is color coded for identification.

Answer 37

insulation

Question 38

_______ requiring color identification are marked at the terminal ends with a _______ or ________ wrapped around the conductor insulation.

Answer 38

Larger conductors, hand-painted stripe, colored tape

Question 39

The grounding (ground) conductor insulation must be color coded _____, ______ with ________, or may be a bare conductor on small conductors in cables.

Answer 39

green, green, one or more yellow stripes,

Question 40

The _________ standard for color coding is ______ or any color, except ___________ (ungrounded/hot); ______ (grounded/neutral); and ____ (ground).

Answer 40

North American standard, black, white, gray, and green, white, green

Question 41

¢ Grounded neutral, white (first or only neutral in raceway, box, auxiliary gutter, or other types of enclosures) ¢ Grounded neutral, white with black stripe running entire length of insulation (when neutral is installed in raceway, box, auxiliary gutter, or other types of enclosures with another neutral) ¢ Grounding conductor, green, green with one or more yellow stripes, green tape, or bare ¢ Ungrounded conductor, black with “120V-1PH"” marking

Answer 41

120V AC single phase, two wire

Question 42

-Grounded neutral, white (first or only neutral in raceway, box, auxiliary gutter, or other types of enclosures) -Grounded neutral, white with brown stripe running entire length of insulation (when neutral is installed in raceway, box, auxiliary gutter, or other types of enclosures with another neutral) -Grounding conductor, green, green with one or more yellow stripes, green tape, or bare -Ungrounded conductor, black with “240/120V-1PH-A” marking -Ungrounded conductor, red with “240/120V-1PH-B” marking

Answer 42

120/240 V AC single phase, three wire

Question 43

Grounded neutral, white (first or only neutral in raceway, box, auxiliary gutter, or other types of enclosures) Grounded neutral, white with red stripe running entire length of insulation (when neutral is installed in raceway, box, auxiliary gutter, or other types of enclosures with another neutral) Grounding conductor, green, green with one or more yellow stripes, green tape, or bare Phase X (ungrounded) conductor, black with “208Y/120V-3PH-X" marking Phase Y (ungrounded) conductor, red with “208Y/120V-3PH-Y” marking Phase Z (ungrounded) conductor, blue with “208Y/120V-3PH-Z" marking

Answer 43

208 Y/120 V AC three phase, four wire

Question 44

Grounded neutral, white (first or only neutral in raceway, box, auxiliary gutter, or other types of enclosures) Grounded neutral, white with yellow stripe running entire length of insulation (when neutral is installed in raceway, box, auxiliary gutter, or other types of enclosures with another neutral) Grounding conductor, green, green with one or more yellow stripes, green tape, or bare Phase X (ungrounded) conductor, brown with “480Y/277V-3PH-X" marking Phase Y (ungrounded) conductor, orange with “480Y/277V-3PH-Y" marking Phase Z (ungrounded) conductor, yellow with “480Y/277V-3PH-Z" marking

Answer 44

480 Y/277 V AC three phase, four wire

Question 45

Grounding conductor, green, green with one or more yellow stripes, green tape, or bare Phase X (ungrounded) conductor, black with “240VD-3PH-X” marking Phase Y (ungrounded) conductor, black with “240VD-3PH-Y” marking Phase Z (ungrounded) conductor, black with “240VD-3PH-2Z" marking

Answer 45

240 delta/120 V AC three phase, three wire

Question 46

Grounding conductor, green, green with one or more yellow stripes, green tape, or bare Phase X (ungrounded) conductor, brown with “480VD-3PH-X” marking Phase Y (ungrounded) conductor, orange with “480VD-3PH-Y” marking Phase Z (ungrounded) conductor, yellow with “480VD-3PH-Z" marking

Answer 46

480 delta V AC three phase, three wire