GET WIRED! 202 Lesson 8 Quiz
11. A service that contains 12 AWG service-entrance conductors, as permitted by 230.23(B) Ex., shall require a grounding electrode conductor sized no larger than _____. A. 6 B. 4 C. 8 D. 10
C. 8
8. The minimum length of a ground rod is ___ft. A. 7 B. 10 C. 8 D. 6
C. 8
12. A main bonding jumper shall be a _____ or similar suitable conductor. A. wire B. bus C. screw D. any of these
D. any of these
4. The minimum diameter of an iron or steel ground rod is ___in. A. 5/8 B. 1/2 C. 1 D. 3/4
A. 5/8
15. When multiple ground rods are used for a grounding electrode, they shall be separated not less than _____ ft apart. A. 6 B. 8 C. 20 D. 12
A. 6
5. The size of the equipment grounding conductor is based upon the rating of the ___ ahead of the supplied equipment. A. overcurrent protective device B. largest service entrance conductor C. ungrounded conductor D. meter
A. overcurrent protective device
14. The minimum diameter of a nonferrous ground rod is ___in. A. 1/2 B. 5/8 C. 3/4 D. 11/32
B. 5/8
6. A metal underground water pipe shall be supplemented by an additional electrode of a type specified in 250.52(A)(2) through (A)(7). Where the supplemental electrode is a rod, pipe, or plate electrode, that portion of the bonding jumper that is the sole connection to the supplemental grounding electrode shall not be required to be larger than _____ AWG copper wire. A. 8 B. 6 C. 4 D. 1
B. 6
10. Electrical service equipment which shall be bonded together includes ___. A. double insulated appliances B. service conductor enclosures C. nonmetallic raceways D. line side service entrance conductors
B. service conductor enclosures
1. Metal underground water piping with at least ___ft. of piping in direct contact with the earth shall be part of the grounding electrode system. A. 5 B. 25 C. 10 D. 6
C. 10
2. The largest size grounding electrode conductor required for any service is a _____ copper. A. 6 AWG B. 1/0 AWG C. 3/0 AWG D. 250 kcmil
C. 3/0 AWG
13. Because of the increasing use of nonmetallic repairs to the interior metal water pipes, interior metal water piping located more than _____ ft from the point of entrance to the building shall not be used as a part of the grounding electrode system or as a conductor to interconnect electrodes that are part of the grounding electrode system. A. 2 B. 4 C. 5 D. 6
C. 5
3. The size of the grounding electrode conductor for a building or structure supplied by a feeder cannot be smaller than that identified in _____ based on the largest ungrounded supply conductor. A. Section 250.66 B. Section 250.122 C. Table 250.66 D. not specified
C. Table 250.66
9. A bare 4 AWG copper conductor installed near the bottom of a concrete foundation or footing that is in direct contact with the earth may be used as a grounding electrode when the conductor is at least _____ ft in length. A. 25 B. 15 C. 10 D. 20
D. 20
7. _____ on equipment to be grounded shall be removed from contact surfaces to ensure good electrical continuity. A. Paint B. Lacquer C. Enamel D. any of these
D. any of these