Chapter 3 wiring Methods And Materials

Question 1

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

Answer 1

300.4A2

Inch and a quarter

Question 2

When direct burial exits the ground what shall it be enclosed in

Answer 2

300.5D 1-4

Raceway 

Question 3

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

Answer 3

310.10 F

2,000v

Question 4

What is the smallest size conductor you can run in parallel

Answer 4

310.10h1

1/0

Question 5

What is the minimum size wire I need to supply a 100 amp single phase 3 wire main service on a mobile home

Answer 5

4 awg copper

310.15b7

Question 6

What is the overcurrent protection for eight number 12 THHN conductors in a half inch pipe

Answer 6

310.15 B3 a

20 a

Question 7

A single-family dwelling has a 100 amp service. What size feeder will be required to supply a 75 amp electric space heater and a 25 AMP air conditioner

Answer 7

310.15 B 16

Number 2 copper

Question 8

What is the minimum size THW conductor that can be used to supply a 200 amp a single phase commercial building

Answer 8

310.15 B 16

3/0 copper

Question 9

What type of conductor is rated for direct burial

Answer 9

310.104A

340.10

UF

Question 10

When using a round box where conductors Orkin nectars requiring the use of lock nuts or bushings are to be connected to a part of the box can they be connected

Answer 10

314.2

Side of the box

Question 11

Type NM cable shall be approved for installing under the lower edges of a joist in crawlspace is if the wire is at least 3-_____awg

Answer 11

8

 334.15 C

Or 2-#6

Question 12

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

Answer 12

314.16 B

2 1/2 in.³

Question 13

What is the maximum number of number 14 conductors allowed in a 4” x 2 in an 8 inch metal octagon trade size box

Answer 13

314.16 A

10


Question 14

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

Answer 14

314.17 C

8 inches

Question 15

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

Answer 15

314.27 a2

50 pounds

Question 16

Floor boxes must be made of what

Answer 16

UL listed

Question 17

What is the maximum distance from a panel that a type M I cable must be secured

Answer 17

332.30

6 feet

Question 18

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

Answer 18

334.80

60°C

Question 19

What type of cable is not approved for service entrance cable 

Answer 19

340.12

UF

Question 20

10 feet of Equipment grounding conductor cannot be made of what

Answer 20

348.20A
250.118.7b

FMC

Question 21

What is the maximum distance between supports for a 1 inch rigid PVC

Answer 21

352.30

3 feet

Question 22

What is the expansion rate of 250 feet of PVC that goes from a temperature change of -20 Fahrenheit to 80 Fahrenheit

Answer 22

352.44

10.15

Question 23

Type RTRC shall be permitted to be unsupported where the raceway is not more than______ Long and remains in unbroken links and terminated in an outlet box

Answer 23

355.30a

3 feet

Question 24

What is the maximum number of conductors allowed in an auxiliary gutter

Answer 24

366.22 a

30

Question 25

What is found in chapter 3

Answer 25

Anything dealing with raceways; distance between support, termination point, Installation is found here.

Ampacity tables

393 Low voltage suspended ceiling power distribution system