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

Systems less than 50V supplied by grounded transformers

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

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

Circuits for electrolytic cells

Question 1 of 35

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

vandalism

undervoltage conditions

contact with the earth

voltage surges

Question 2 of 35

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

should be connected to metal raceways

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

Question 3 of 35

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

25 ohms or less

35 ohms or less

45 ohms or less

75 ohms or less

Question 4 of 35

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

each other

the main bonding jumper

the grounding electrode conductor

neutral

Question 5 of 35

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

0.06ʺ thick

1⁄4ʺ thick

0.08ʺ thick

1⁄2ʺ thick

Question 6 of 35

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

1.5' below grade

2.0' below grade

3.0' below grade

2.5' below grade

Question 7 of 35

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

six-point method

ten-point method

one-point method

three-point method

Question 8 of 35

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

between the equipment and ground bar

between the feeder panel and the equipment

on the supply side of the service disconnect

between the equipment and the equipment grounding bus

Question 9 of 35

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

It supersedes the operation of overcurrent devices.

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

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

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

Question 10 of 35

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

10' apart

6' apart

8' apart

12' apart

Question 11 of 35

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

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

NEC Section 250.64

NEC Section 250.52(A)(2)

NEC Article 250, Part III

Question 12 of 35

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

grounded connectors and non-current carrying conductors

ungrounded connectors and non-current carrying conductors

ungrounded conductors

any of the conductors of an electrical system

Question 13 of 35

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

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 have sufficiently high impedance to facilitate the operation of protective devices.

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

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

Question 14 of 35

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

the system housing to the feeder panel

system housing to the neutral bus bar

neutral bus bar to the grounding electrode conductor

neutral on the supply side to the equipment housing

Question 15 of 35

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

Metal water pipe

Plate electrode

Grounding electrode conductor

Main bonding jumper

Question 16 of 35

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

Ground mat

Ground rod

Grounding clip

Grounding electrode

Question 17 of 35

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

maximizing impedance

minimizing impedance

utilizing threaded couplings

electrical continuity

Question 18 of 35

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

No connection to the box is required.

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.

Question 19 of 35

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

10'

16'

Question 20 of 35

21. System grounding relates to the ________.

EGCs

systems over 250 volts

rod and pipe electrodes

service-entrance equipment

Question 21 of 35

22. Which of the following describes bonding?

Connecting to establish electric continuity and conductivity

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

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

Securing a bonding conductor to an outlet box

Question 22 of 35

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

EGC carries the current to the earth

current travels to the grounding electrode

overcurrent devices are opened

surge current is dissipated by the grounding electrode

Question 23 of 35

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

1ʺ

1-1⁄4ʺ

1⁄2ʺ

3⁄4ʺ

Question 24 of 35

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

is the maximum capacity of the system

is 240V

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

is 120V

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%

14%

20%

12.5%

Question 26 of 35

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

grounded directly to the grounding electrode conductor

powered from a source other than a service

limited to DC power

completely contained in one building

Question 27 of 35

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

length of the conduit

size of the largest conductor

size of the neutral

size of the overcurrent device

Question 28 of 35

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

Equipment grounding conductor

Rod electrode

Pipe electrode

Plate electrode

Question 29 of 35

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

Systems 1kV and over

Systems less than 50V

Systems of 150V

Systems 1,000V and over

Question 30 of 35

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

10ʺ above grade

6ʺ above grade

below permanent moisture level if practicable

4ʺ above grade

Question 31 of 35

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

NEC Table 310.15(B)(16)

NEC Article 280

NEC Table 400.4

NEC Sections 250.20 and 250.21

Question 32 of 35

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

grounding conductors

grounding electrodes

bonding

metal raceways

Question 33 of 35

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

metal frame of a building which is effectively grounded

PVC water pipe

underground gas pipe

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

Question 34 of 35

35. Which of the following describes a ground fault?

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

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 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

Question 35 of 35

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