Chapter 3 Wiring Methods And Materials

Question 1

The minimum distance on the edge of a stud must be from the edge of a hole for NM cable is?

Answer 1

1 1/4”

Question 2

When the direct burial access the ground, what shall they be enclosed in?

Answer 2

Raceway

Question 3

At what rated voltage does direct burial cable have to be shielded?

Answer 3

2,000 volts

Question 4

What is the smallest Size conductor you can run in parallel?

Answer 4

1/0

Question 5

What is the minimum size wire needed to supply hundred amp single phase 3 wire main service on a mobile home?

Answer 5

4

Question 6

Family dwelling has 100 amp service. What size feeder will be required to supply 75 amp electric space heater and a 25 amp air conditioner?

Answer 6

2

75 x 125%=93.75

Question 7

What is the minimum size THW conductor that can be used to supply is 20 amp single phase commercial building?

Answer 7

3/0 copper

Question 8

What type of conductor is rated for a direct burial?

Answer 8

UF

Question 9

When using a round box where conductors or connectors requiring the use of locknuts or bushings are to be connected, to what part of the box can they not be connected?

Answer 9

Side of the box

Question 10

Nm cable shall be approved for installing under the lower edges of a Joist in crawlspaces if the wires are at least three ____AWG?

Answer 10

8 awg or 2 #6s

Question 11

What is the required free space in a junction box for a number 10 conductor?

Answer 11

2.5 cubic inches

Question 12

What is the maximum number 14 conductors in a 4 x 2 1/8” metal octagon trade size box?

Answer 12

10

Question 13

Type NM cable Shall be secured how many inches from a non-metallic box if there is no clamp?

Answer 13

8 inches

Question 14

A fixture box shall be independently supported if the fixture weighs more than how many pounds?

Answer 14

50 lbs

Question 15

Floor boxes must be made of what??

Answer 15

UL listed

Question 16

Maximum distance from a panel that a type MI cable shall be secured?

Answer 16

6 feet

Question 17

What is the temperature rating for the conductor of type NM cable

Answer 17

60 C

Question 18

What type of cable is not approved to be a SE cable?

Answer 18

UF

Question 19

For gas stations ____ can be used as a raceway under class 1 division 1 under 8 inches of fill dirt.

Answer 19

RMC

Question 20

10 feet of equipment grounding conductor cannot be made of what?

Answer 20

FMC

Question 21

What is the maximum distance between supports of 1” rigid pvc?

Answer 21

3 feet

Question 22

What is the expansion rate of 250 feet of pvc that goes from a temperature change of -20 F to 80 F?

Answer 22

10.15

Question 23

Type RTRC shall be permitted to be unsupported where the raceway is not more than ____ long and remains in unbroken lengths and terminated in an outlet box?

Answer 23

3 feet

Question 24

What is the maximum number of conductors allow in an auxiliary gutter?

Answer 24

30