IO #7 - Chap. 1-5+7

Question 1

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

Answer 1

Grounded

Question 2

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

Answer 2

True

Question 3

The frame of an automobile or airplane is not grounded. T/F

Answer 3

True

Question 4

The conductive object directly connected to Earth through which grounding is established, is the ?.

Answer 4

Grounding Electrode

Question 5

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.

Answer 5

Ground Fault

Question 6

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?

Answer 6

Ground Fault

Question 7

Not connected to ground or to a conductive body that extends the ground connection

Answer 7

Ungrounded

Question 8

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

Answer 8

Negative side

Question 9

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

Answer 9

480V

Question 10

In a 60-cycle AC circuit, the voltage and current change amplitude and direction ? times per second.

Answer 10

120

Question 11

Fuses and circuit breakers are required to be marked with all but which of the following ratings?
Select one:
a. Ampere interrupting current rating
b. Normal current rating
c. Resistance
d. Voltage

Answer 11

c. Resistance

Question 12

The ? of an electrical system is the maximum current a system is capable of delivering at any point on the wiring installation.

Answer 12

Available Fault Current

Question 13

An unintentional conducting connection between two ungrounded conductors of a circuit is a ?.

Answer 13

Short Circuit

Question 14

Inverse time operation of overcurrent devices means that the ? the current, the ? the device will react to the ground fault or short circuit event.

Answer 14

Higher / Faster

Question 15

Which of the following organizations developed the formulas to determine insulated and bare conductor current withstand ratings?
Select one:
a. General Cable Company
b. Insulated Cable Engineers Association (ICEA)
c. International Association of Electrical Inspectors (IAEI)
d. International Code Council (ICC)

Answer 15

b. Insulated Cable Engineers Association (ICEA)

Question 16

Which NEC table provides the minimum sizes for wire-type equipment grounding conductors?

Answer 16

250.122

Question 17

Which of the following test instruments is commonly used to determine the integrity of conductor insulation?

Answer 17

Megohmmeter

Question 18

Wire-type equipment grounding conductors expressed in Table 250.122 of the NEC are approximately   ?   of the circuit conductor size.
Select one:
a. 20%
b. 25%
c. 50%
d. 100%

Answer 18

b. 25%

Question 19

Applying an overcurrent device (fuse or circuit breaker) within its marked interrupting rating will ensure that the overcurrent device can safely open the circuit in a ground fault condition. T/F

Answer 19

True

Question 20

A(n) ? is defined as a reliable conductor that ensures continuity and conductivity between metal parts required to be electrically connected.

Answer 20

Bonding conductor or Jumper

Question 21

A grounded conductor of a system could be a ? conductor or a phase conductor.

Answer 21

Neutral

Question 22

Which of the following is NOT permitted to be used to identify a grounded conductor?
Select one:
a. Bare conductor of Type SEU cable
b. Gray
c. Green
d. White

Answer 22

c. Green

Question 23

? of Article 250 specifically applies to grounding systems and circuits over 1,000 volts.

Answer 23

Part X

Question 24

What is the largest size aluminum grounding electrode conductor required by the NEC?

Answer 24

250kcmil

Question 25

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

Answer 25

2

Question 26

Requirements for installing AC grounding electrode conductors are provided in ? of Article 250.

Answer 26

Part III

Question 27

Which part of Article 250 applies specifically to grounding DC systems?

Answer 27

Part VIII

Question 28

Notes to NEC Tables are mandatory requirements. T/F

Answer 28

True