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1. To be effective, a grounding system must limit the voltage on the electrical system and protect it from ________.

vandalism

undervoltage conditions

voltage surges

contact with the earth

Question 1 of 35

2. A ground ring consisting of 20' of No. 2 bare copper must be buried no less than ________.

2.0' below grade

2.5' below grade

1.5' below grade

3.0' below grade

Question 2 of 35

3. Which of the following is true of the neutral in a grounded system?

It precludes utilization of power at line-to-neutral voltage.

It prevents the current carrying conductor from carrying an unbalanced load.

It supersedes the operation of overcurrent devices.

It provides a low-impedance return path for the flow of fault current to the source.

Question 3 of 35

4. A separately derived system is a premises wiring system that is ________.

completely contained in one building

powered from a source other than a service

grounded directly to the grounding electrode conductor

limited to DC power

Question 4 of 35

5. Which of the following describes bonding?

Connecting to establish electric continuity and conductivity

Securing a bonding conductor to an outlet box

Connecting to the ground or to a conductive body that extends the ground connection

Connecting the normally noncurrent-carrying metal parts of equipment together and to the system grounded conductor

Question 5 of 35

6. Which of the following must be connected to the neutral terminal bus of a main distribution panel?

Grounding electrode conductor

Plate electrode

Main bonding jumper

Metal water pipe

Question 6 of 35

7. Which of the following describes a ground fault?

The unintentional, electrically conducting connection between an ungrounded conductor of an electrical circuit and the normally noncurrent-carrying conductors, metallic enclosures, metallic raceways, metallic equipment, or the earth

An open connection between an electrical circuit or equipment and the earth

A conducting connection between any of the conductors of an electrical system

The connection between two or more portions of the equipment grounding conductor

Question 7 of 35

8. Plate electrodes made of copper must be at least ________.

1⁄4ʺ thick

0.08ʺ thick

1⁄2ʺ thick

0.06ʺ thick

Question 8 of 35

9. When a ground rod is installed, the top of the rod must be positioned ________.

6ʺ above grade

10ʺ above grade

below permanent moisture level if practicable

4ʺ above grade

Question 9 of 35

10. An acceptable grounding electrode is a(n) ________.

metal frame of a building which is effectively grounded

underground water pipe in direct contact with the earth for 6'

PVC water pipe

underground gas pipe

Question 10 of 35

11. Where there is a requirement to add a second grounding electrode, the two electrodes must be spaced at least ________.

6' apart

12' apart

10' apart

8' apart

Question 11 of 35

12. Which of the following is used to secure equipment grounding conductors to metallic outlet boxes?

Ground rod

Ground mat

Grounding clip

Grounding electrode

Question 12 of 35

13. Equipment grounding refers to connecting the normally noncurrent-carrying metal parts of equipment to the system grounded conductor and/or ________.

each other

neutral

the main bonding jumper

the grounding electrode conductor

Question 13 of 35

14. Rod, pipe, and plate electrodes must have a resistance to ground of at least ________.

75 ohms or less

25 ohms or less

35 ohms or less

45 ohms or less

Question 14 of 35

15. System grounding relates to the ________.

service-entrance equipment

systems over 250 volts

rod and pipe electrodes

EGCs

Question 15 of 35

16. Which of the following is an NEC® requirement for grounding and bonding?

The path to ground from circuits, equipment, and metal enclosures shall rely on the earth as an effective ground fault current path.

The path to ground from circuits, equipment, and metal enclosures shall have sufficiently high impedance to facilitate the operation of protective devices.

The path to ground from circuits, equipment, and metal enclosures shall be capable of safely carrying twice the maximum current of the system.

The path to ground from circuits, equipment, and metal enclosures shall be permanent and continuous.

Question 16 of 35

17. The requirements for grounding of services are located in ________.

NEC Article 250, Part III

NEC Section 250.52(A)(2)

NEC Section 250.64

NEC Sections 250.24(A), (B), (C), and (D)

Question 17 of 35

18. Which of the following must have at least 2 square feet of surface area exposed to the surrounding earth?

Equipment grounding conductor

Plate electrode

Rod electrode

Pipe electrode

Question 18 of 35

19. The maximum value of a short circuit current from line-to-ground ________.

is 240V

is the maximum capacity of the system

is 120V

will vary depending on the distance from the source to the fault

Question 19 of 35

20. If Single-Gang Nail-On non-metallic boxes are used with NM cable, which of the following is true?

A standard electrician's staple connects the box to the cable.

A grounding clip connects the box to the cable.

Electrical tape connects the box to the cable.

No connection to the box is required.

Question 20 of 35

21. In a separately derived system, the equipment bonding jumper connects ________.

system housing to the neutral bus bar

neutral bus bar to the grounding electrode conductor

the system housing to the feeder panel

neutral on the supply side to the equipment housing

Question 21 of 35

22. Which type of system is required to be grounded?

Circuits for cranes that operate over combustible fibers in Class III locations

Systems less than 50V supplied by grounded transformers

Circuits for electrolytic cells

AC systems over 1,000V that supply mobile or portable equipment

Question 22 of 35

23. The minimum diameter of galvanized pipe allowed for a grounding electrode is ________.

1⁄2ʺ

1-1⁄4ʺ

1ʺ

3⁄4ʺ

Question 23 of 35

24. Which transformer-supplied system must be grounded if the supply voltage to the transformer exceeds 150V?

Systems 1,000V and over

Systems less than 50V

Systems 1kV and over

Systems of 150V

Question 24 of 35

25. The size of the equipment grounding conductor (EGC) is determined by the ________.

length of the conduit

size of the overcurrent device

size of the largest conductor

size of the neutral

Question 25 of 35

26. Where a main bonding jumper is required by the NEC®, the jumper cannot be less than what percentage of the area of the largest phase conductor?

17.5%

20%

14%

12.5%

Question 26 of 35

27. A ground test utilizing an earth ground resistance tester is known as the ________.

ten-point method

one-point method

six-point method

three-point method

Question 27 of 35

28. The key to successfully clearing ground fault currents is ________.

maximizing impedance

utilizing threaded couplings

electrical continuity

minimizing impedance

Question 28 of 35

29. Ultimately, the ground fault is cleared when the ________.

overcurrent devices are opened

current travels to the grounding electrode

surge current is dissipated by the grounding electrode

EGC carries the current to the earth

Question 29 of 35

30. The minimum length allowed for driven ground rods under normal conditions is ________.

10'

16'

Question 30 of 35

31. The bonding jumper for multiple disconnecting means is located ________.

on the supply side of the service disconnect

between the equipment and the equipment grounding bus

between the feeder panel and the equipment

between the equipment and ground bar

Question 31 of 35

32. The continuity between service equipment and enclosures is maintained by ________.

grounding electrodes

grounding conductors

metal raceways

bonding

Question 32 of 35

33. If the neutral in a grounded system is not needed for voltage requirements, it ________.

must be run to the service and connected to the GEC and EGC

should not be connected to the grounded electrode conductor

should be connected to the overcurrent device

should be connected to metal raceways

Question 33 of 35

34. Grounding requirements for AC systems are contained in ________.

NEC Article 280

NEC Table 400.4

NEC Sections 250.20 and 250.21

NEC Table 310.15(B)(16)

Question 34 of 35

35. A short circuit is a conducting connection between ________.

ungrounded connectors and non-current carrying conductors

ungrounded conductors

any of the conductors of an electrical system

grounded connectors and non-current carrying conductors

Question 35 of 35

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