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Exam: 006828RR - Grounding, Wiring, and Raceway Systems
1. The NEC states that a grounding connection shall not be made to any grounded circuit conductor on the
_______ of the service disconnecting means except as permitted for separately derived systems or separate
buildings.
A. line
B. power
C. supply
D. load
2. What minimum-size, 411 ″ square box is required for four 12 AWG, four 10 AWG, and four 8 AWG
conductors spliced in this box?
3. According to the NEC, the maximum run length of ½-inch, flexible metal conduit for any circuit is
A. 8 feet.
B. 12 feet.
C. 3 feet.
D. unlimited.
4. 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 frac58;″ 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.
5. 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 B is correct.
C. Only Electrician A is correct.
D. Both electricians are correct.
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. 16″
B. 8″
C. 48″
D. 24″
7. Which of the following raceways is permitted for installation in cinder fill without additional protection?
A. RMC
B. EMT
C. IMC
D. PVC
8. 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 11/16 × 1½
B. 4 11/16 × 2⅛
C. 4 × 1½
D. 4 × 2½
9. 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. solid
B. rigid
C. flexible
D. core
10. The NEC requires that when liquid-tight, flexible metal conduit is used as a fixed raceway, it must be secured within _______ inches on each side of each box, and at intervals not exceeding _______ feet.
A. 12, 4½
B. 12, 3
C. 18, 3
D. 18, 4
11. What is the bending radius for 1½-inch diameter, corrugated MC cable?
A. 22.5 inches
B. 10.5 inches
C. 18.0 inches
D. 15.0 inches
12. 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. Pull box
B. Junction box
C. Handhole box
D. Device box
13. When No. 8 AWG copper conductors are contained in a vertical raceway, the raceway must be supported so that the interval between supports does not exceed _______ feet.
A. 135
B. 100
C. 120
D. 60
14. 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. 8
B. 4
C. 6
D. 3
15. Which of the following is an acceptable installation for the use of Type NM (Romex) cable?
A. Service entrance cable
B. Embedded in concrete
C. Detached garage of two-family residence
D. Wet/damp locations
16. 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. Only Electrician A is correct.
B. Both electrician are correct.
C. Only Electrician B is correct.
D. Neither electrician is correct.
17. According to the NEC, _______ must be installed in a raceway system that passes from the interior to
the exterior of a building.
A. S loops
B. tap conductors
C. color tagging
D. seals
18. Which of the following is not an electrode permitted for grounding per the NEC?
A. Stainless steel rod or pipe
B. Copper rod or pipe
C. Aluminum rod or pipe
D. Galvanized steel rod or pipe
19. What is the minimum length of a pull box connected to three, 2-inch diameter raceways?
A. 32 inches
B. 48 inches
C. 12 inches
D. 16 inches
20. According to the NEC, what type of threadless connectors and couplings must be used with rigid metal conduit if installed in masonry?
A. Wet/damp listed
B. Rain tight
C. Weatherproof
D. Concrete tight
