Which of the following applications would be a violation of the nec

1. Which of the following applications would be a violation of the NEC for an installation using PVC conduit?

A. Behind walls

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B. Laundry room

C. Supporting a light fixture

D. Underground

 

2. Which of the following raceways is permitted for installation in cinder fill without additional protection?

A. IMC

B. RMC

C. EMT

D. PVC

 

3. Two electricians are discussing different wiring methods. Electrician A says that because the conduit body indicates its capacity in cubic inches, splices can be used within the conduit body. Electrician B says that the conductors must be installed before the raceway is complete. Which of the following statements is correct?

A. Only Electrician A is correct.

B. Only Electrician B is correct.

C. Both electricians are correct.

D. Neither electrician is correct.

 

4. Which of the following is not an acceptable condition for an installation using FMC (Greenfield) raceway?

A. With supports every 3½ feet

B. With angle connectors behind drywall

C. With supports 8″ on either side of each box

D. With three 90° bends between two pull points

 

 

5. What minimum-size, square metal box is required for six, 12 AWG, three, 10 AWG, and 4, 8 AWG conductors spliced in this box? The box has two internal AC cable clamps.

A. 4 × 1½

B. 4 11/16 × 2⅛

C. 4 11/16 × 1½

D. 4 × 2½

 

6. A pull box used for a straight pull is part of an installation where three 2-inch conduit raceways are connected on both side of the pull box. What is the minimum length required for the pull box per the NEC?

A. 8″

B. 24″

C. 16″

D. 48″

 

 

7. According to the NEC, only a _______ wiring method can be used for a surface extension from the cover of a concealed box (provided the cover is unlikely to fall off), and the wiring method must include an equipment-grounding conductor.

A. rigid

B. solid

C. flexible

D. core

 

8. Which of the following boxes commonly used in electrical work is used at a point in the circuit where current is applied to utilization equipment?

A. Device box

B. Pull box

C. Junction box

D. Handhole box

 

9. Two electricians are discussing bonding circuits. Electrician A says that to bond an isolated ground circuit more, you can add reducing washers to improve the low impedance path. Electrician B says that in a hazardous location, the bonding can use a bonding bushing with a jumper. Which of the following statements is correct?

A. Neither electrician is correct.

B. Only Electrician A is correct.

C. Only Electrician B is correct.

D. Both electricians are correct.

 

10. A vertical raceway requires intermediate cable supports. If the raceway carries 3/0 AWG copper conductors, at what distance in meters will the supports be required?

A. 80

B. 60

C. 25

D. 30

 

11. What is the maximum number of No. 6 AWG conductors that can be installed in a 4″ × 2⅛″ round metal box if there are no clamps, fittings, devices or grounding conductors in the box?

A. 4

B. 8

C. 6

D. 3

 

12. What minimum-size, 411∕16″ square box is required for four 12 AWG, four 10 AWG, and four 8 AWG conductors spliced in this box?

A. 411∕16″ × 2⅛″

B. 411∕16″ × 1¼″

C. 411∕16″ × 2¼″

D. 411∕16″ × 1½″

 

 

 

 

13. What is the minimum length of a pull box connected to three, 2-inch diameter raceways?

A. 16 inches

B. 48 inches

C. 12 inches

D. 32 inches

 

14. What is the bending radius for 1½-inch diameter, corrugated MC cable?

A. 10.5 inches

B. 18.0 inches

C. 22.5 inches

D. 15.0 inches

 

15. Flexible metal conduit is permitted for grounding by the NEC if the length in any ground return path is not over 6 feet, and the circuit conductors are protected by an overcurrent protection device that does not exceed _______ amperes.

A. 15

B. 30

C. 20

D. 60

16. What is the required bend radius for service entrance cable, 3-conductor, 3/0 AWG, approximately 1inch in diameter?

A. 15″

B. 5″

C. 1″

D. 3″

17. Where resistance to ground of a single made-electrode exceeds 25 ohms,

A. the electrode can be omitted.

B. no additional electrodes are required.

C. one additional electrode must be added.

D. additional electrodes must be added until the resistance to ground is lower than 25 ohms.

 

18. Two electricians are discussing grounding. Electrician A says that 6″ of an 8′ rod or pipe electrode is allowed to extend above the finished grade. Electrician B says that a “made” grounding electrode constructed from copper rod that is ⅝″ in diameter and 100″ long is acceptable per the NEC. Which of the following statements is correct?

A. Only Electrician A is correct.

B. Neither electrician is correct.

C. Both electricians are correct.

D. Only Electrician B is correct.

 

19. Which of the following is an acceptable installation for the use of Type NM (Romex) cable?

A. Embedded in concrete

B. Service entrance cable

C. Detached garage of two-family residence

D. Wet/damp locations

20. Two electricians are discussing underground installation of raceways. Electrician A says that cables installed under a building must be in a raceway. Electrician B says that nonmetallic raceways placed under a two-family driveway must have at least 18 inches from the top of the raceway to the surface of the finished grade. Which of the following statements is correct?

A. Neither electrician is correct.

B. Both electricians are correct.

C. Only Electrician B is correct.

D. Only Electrician A is correct.

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