Grounding And Bonding 1

Front 1

This is described as the practical safeguarding of persons and property from using electricity?

Back 1

Purpose of the NEC

Front 2

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

Back 2

Grounded

Front 3

In one word, define ground?

Back 3

Earth

Front 4

The connection to earth through which grounding is accomplished is provided by what?

Back 4

Grounding Electrode

Front 5

This 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:

Back 5

Bonding

Front 6

The processes of "this" and "this" work simultaneously to reduce potential differences between conductive parts and the earth, thereby reducing shock hazards:

Back 6

Grounding and Bonding

Front 7

This occurs when electrical current in a circuit returns through the equipment grounding conductor; through conductive material other than the electrical system ground; through a person; or through a combination of these ground return paths.

Back 7

Ground Fault

Front 8

Grounding includes two basic concepts: Grounding of "this" and grounding of "this".

Back 8

Equipment and systems

Front 9

Opposition to a DC circuit is?

Back 9

Resistance

Front 10

Opposition in a AC circuit is?

Back 10

Impedance

Front 11

The frame of an automobile is typically what of the electrical system?

Back 11

Negative side of the battery

Front 12

This is the Electromotive force of a circuit

Back 12

Voltage

Front 13

For current to be present in electrical circuits, including grounding and bonding circuits, the circuit must be what?

Back 13

Complete

Front 14

In its simplest form, this is two conductors separated by insulation.

Back 14

Capacitor

Front 15

This is the maximum current a system is capable of delivering at any point on the wiring installation.

Back 15

Available Fault Current

Front 16

This is an unintentional conduction connection between two ungrounded conductors of a circuit.

Back 16

Short Circuit

Front 17

There are three common causes of conductor insulation failure, what are they?

Back 17

Heat, Moisture, Excessive Voltage Stress

Front 18

This organization developed the formulas to determine insulated conductor current withstand ratings.

Back 18

Insulated Cable Engineers Association-ICEA

Front 19

Wire-type equipment grounding conductors expressed in table 250.122 of the NEC are approximately what percent of the circuit conductor size?

Back 19

25%

Front 20

What instrument best determines the integrity of conductor insulation?

Back 20

Megohmmeter

Front 21

This is defined as 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.

Back 21

Ground-Fault Current Path

Front 22

This is the foundation of an electrical system.

Back 22

Grounding Electrode System

Front 23

These chapters in the NEC apply generally:

Back 23

1 through 4

Front 24

Who has the responsibility for approval of electrical installations and systems and interpreting NEC rules?

Back 24

AHJ

Front 25

This is a reliable conductor to ensure the required electrical conductivity between metal parts required to be electrically connected:

Back 25

Bonding Conductor or Jumper

Front 26

The NEC is made up of an introduction and how many chapters?

Back 26

9

Front 27

Green wire is not permitted to be used to identify what?

Back 27

Grounded Conductor

Front 28

How many equipment grounding conductors are required to be installed with branch circuits serving patient care locations?

Back 28

2

Front 29

If a term is used in more than two articles in the NEC, it qualifies for inclusion where in the NEC?

Back 29

Article 100

Front 30

What part of Article 250 specifically applies to grounding systems and circuits over 1000V?

Back 30

Part X

Front 31

This NEC table is required to be used for minimum sizing of equipment grounding conductors for branch circuit.

Back 31

NEC Table 250.122

Front 32

This provides the essential function of connecting the electrical system or electrical equipment to the earth.

Back 32

Grounding Electrode

Front 33

Underground metal gas piping is not permitted to be used as what?

Back 33

Grounding Electrode

Front 34

A concrete-encased electrode can be installed in either a vertical or horizontal orientation and it must have not have less than how many feet in direct contact with the earth?

Back 34

20 Feet

Front 35

The NEC makes it clear that if any grounding electrodes are present at the building or structure served by electrical power, the electrodes must be what?

Back 35

Bonded Together

Front 36

A ground ring electrode must completely encircle a building or structure, be not less that 20 feet in length and must be buried not less that how many inches below the grade?

Back 36

30 Inches

Front 37

Stainless Steel rod electrodes that are listed must not have a diameter less than what?

Back 37

5/8" or 1/2"

Front 38

A plate electrode is required to have not less than how much of its surface in direct contact with the earth?

Back 38

2 square feet

Front 39

A rod or pipe electrode is generally required to be driven to a depth of not less that what?

Back 39

8 feet

Front 40

What is the maximum resistance to a ground permitted for a grounding electrode system consisting of a concrete-encased electrode, building steel electrode and metal water pipe electrodes

Back 40

There is no MAX Resistance Value

Front 41

A distance of not less than how far should be maintained between an 8 foot ground rod and the next closest ground rod?

Back 41

6 feet

Front 42

This is defined as the conductors and equipment for delivering electric energy from the serving utility to the wiring system of the premises served.

Back 42

Service

Front 43

There are four necessary conductors in the grounding and bonding scheme for a service supplied by a ground system:

Back 43

Grounded Conductor, Equipment Grounding Conductor, Main Bonding Jumper, Grounding Electrode Conductor

Front 44

This conductor carries the maximum unbalanced return neutral load and serves as an effective ground-fault current path in ground fault conditions.

Back 44

Grounded neutral conductor

Front 45

Where the service disconnecting means is made up of 2 to 6 disconnects in a listed assembly, how many main bonding jumpers are required within the assembly?

Back 45

As many as the number of service disconnects

Front 46

If a main bonding jumper is a screw, what color must it be?

Back 46

Green

Front 47

The NEC requires that "this" be provided in the grounded conductor service equipment.

Back 47

Disconnecting Means

Front 48

Grounding connections to the grounded conductor are generally not permitted on this side of the grounding point within the service equipment enclosure.

Back 48

Load side

Front 49

The NEC generally requires all metal enclosures and raceways for service conductors to be grounded except for metal elbows in a run of nonmetallic service raceway that are isolated from contact by persons by not less than how many inches of cover to any part of the elbow?

Back 49

18 inches

Front 50

These are required to be installed on services supplied by ungrounded systems.

Back 50

Ground Detectors

Front 51

The grounded conductor is required to be routed to the service equipment along with its associated what?

Back 51

Ungrounded Service-Entrance Conductors