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Grounding and bonding > ch 1 > Flashcards

ch 1 Flashcards

1
Q

The practical safeguarding of persons and property from hazards arising from the use of electricity best describes which of the following?

A

The purpose of the NEC

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2
Q

If a conductive part is connected to ground or to a conductive body that extends a ground connection it is ? .

A

grounded

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3
Q

Which of the following best defines the word ground?

A

earth

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4
Q

When electrical systems or equipment are grounded, the ground (Earth) is part of the electrical circuit.

A

true

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5
Q

The Earth as a conductive body can serve as an effective ground-fault current path to facilitate the operation of fuses or circuit breakers protecting the system.

A

false

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6
Q

conductive body that extends the ground connection?

A

Equipment bonding jumpers

Equipment grounding conductor

Grounding electrode conductor

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7
Q

The frame of an automobile or airplane is not grounded.

A

true

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8
Q

The conductive object directly connected to Earth through which grounding is established, is provided by which of the following?

A

Grounding electrode

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9
Q

Which of the following is accomplished through electrical bonding?

A

Conductivity

Connecting together

Continuity

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10
Q

Bonding minimizes potential differences between conductive parts that are bonded together. It also safeguards against shock hazards, and in many cases ensures an effective path for ground fault current.

A

true

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11
Q

The processes of grounding and bonding work simultaneously to reduce potential differences between conductive parts and the Earth, thereby reducing shock hazards.

A

true

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12
Q

A(n) ? occurs when electrical current in a circuit returns through the equipment grounding conductor (EGC), through conductive material other than the electrical system ground (metal, water pipes, and so forth), through a person or through a combination of these ground return paths.

A

ground fault

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13
Q

Which of the following conditions is a factor in a person receiving an electric shock?

A

The current must exit through a second contact point.

There must be a contact point on the body for entry of the circuit current.

There must be a voltage to force the current across the human body.

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14
Q

Current will take only the path of least resistance when attempting to return to the source.

A

false

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15
Q

Which of the following is a function of grounding electrical systems?

A

Limit line surges, or unintentional contact with lines of higher voltage

Limit potentials (voltages) imposed by lightning

Stabilize voltages during normal operation

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16
Q

Grounding includes two basic concepts: grounding of equipment and grounding of systems.

A

true

17
Q

When an electrical system is grounded, one conductor of the system is intentionally connected to ground and is referred to by the NEC as the ? conductor.

A

grounded

18
Q

If the Code provides a requirement to ground equipment, it generally implies that there will be either a direct connection to the Earth or a connection to ground through which of the following?

A

Equipment grounding conductor

Grounding electrode

Grounding electrode conductor

19
Q

An unintentional, electrically conducting connection between an ungrounded conductor of an electrical circuit and the normally non–current-carrying conductors, metallic enclosures, metallic raceways, metallic equipment, or Earth best defines which of the following?

A

Ground fault

20
Q

Which of the following are characteristics of an effective ground-fault current path?

A

Intentionally constructed

Low-impedance electrically conductive path

Designed and intended to carry current during ground-fault conditions

21
Q

A(n) ? is an electrically conductive path from the point of a ground fault on a wiring system through normally non–current-carrying conductors, equipment, or the Earth to the electrical supply source.

A

ground-fault current path

22
Q

In an ungrounded electrical system there is normally no connection to Earth from any conductor supplied by the system, other than through distributed leakage capacitance.

A

true

23
Q

In a grounded system, normally non–current-carrying electrically conductive materials that are likely to become energized, such as building metal framing and metal water piping, shall be connected together and to the electrical supply source in a manner that establishes an effective ground-fault current path.

A

true

24
Q

The total opposition to current in an AC circuit is known as circuit ? .

A

impedance

25
Q

The opposition to current in a DC circuit is ? .

A

resistance

26
Q

Loose connections in the equipment grounding conductor and effective ground-fault current path introduce additional impedance that can impact overcurrent device operation.

A

true

27
Q

All electrical conductors and equipment covered by the NEC are required to be installed in a neat and workmanlike manner.

A

true

28
Q

Not connected to ground or to a conductive body that extends the ground connection best describes which of the following terms?

A

Ungrounded

29
Q

The frame of an automobile is typically the ? of the vehicle electrical system.

A

negative side of the battery

30
Q

When an electrical system is not grounded, there is no intentional connection between any of the system conductors and the Earth.

A

true

31
Q

Where the Code requires a conductive part or a system to be grounded, a connection to ? is implied and required.

A

earth

32
Q

If there is no connection to the ground (earth) there is no grounding.

A

true

33
Q

When a person receives an electric shock, the path through the body can be which of the following?

A

Foot to foot

Hand to foot

Hand to hand

34
Q

Which of the following is not a performance function of grounding?

A

Stabilizing voltage to ground

35
Q

What is the phase-to-ground voltage of a corner grounded 480-volt, 3-phase, 3-wire, delta-connected system?

A

480v

Grounding and bonding (6 decks)

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