308 Equipment Grounding And Equipment Grounding Conductors Flashcards

1
Q

A _____ is permitted to serve as equipment grounding conductor.

I. Bare conductor included as part of a list cable assembly
II. Metallic cable sheath to armor
III. Metallic water pipe system

a. I & lII only
b. II & III only
c. II only
d. I & II only
e. I only
f. None of these

A

d. I &II only

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2
Q

Under conditions of maximum ground fault current flow, an equipment grounding system should ____.

I. Incorporate adequate conductance. II. Not present a fire hazard

a. I only
b. II only
c. Both I & II
d. neither I nor II

A

c. Both I & II

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3
Q

A circuit is installed in EMT and compression fittings are used. A separate EGC is not installed in the conduit. If a ground fault occurs and one or more couplings were never tightened properly, compared to normal operation, the fault current will be ____ and the OCPD will take ____ time to open.

a. Lower Less
b. Higher More
c. Lower More
d. lower The same
e. Higher More

A

c. Lower More

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4
Q

Which part of article 250 covers equipment grounding and equipment grounding conductors.

a. I
b. IV
c. VI
d. III

A

c. Part VI

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5
Q

During periods of ground fault, loose couplings and connectors used in metal conduit systems can cause fire hazard.

a. True
b. False

A

a. True

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6
Q

The equipment grounding conductor size according to the type of material (copper, aluminum, copper-clad aluminum) used for Phase conductors and the cross-section areas of the phase conductors.

a. True
b. False

A

b. False

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7
Q

For portable tools used in other than residential occupancies, NEC 250.114(4)(g) exception allows the use of _____ in lieu of grounding.

a. Drain wires
b. Metallic shielding
c. Isolation transformers
d. Double insulation

A

c. Isolation transformers

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8
Q

The resistance of conductor is inversely proportional to the Cross-section area. This means that the resistance _____  as the Cross-section area of the conductor increases.

a. Decreases
b. Increases

A

a. Decreases

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9
Q

To avoid arcing and sparking at the threaded joints in RMC and IMC, the threads must be _____ Before assembly.

a. Cleaned
b. Tack-welded
c. Cut
d. All of these

A

a. Cleaned

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10
Q

During periods of ground fault, a circuit that utilizes large circuit conductors will have a _____ level of fault current than a circuit with small conductors.

a. Lower
b. Higher

A

b. Higher

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11
Q

When a circuit is installed in a metal conduit, installation of an _____ Equipment grounding conductor reduces the ground fault current path Impedance and makes it more effective.

a. External
b. Internal

A

b. Internal

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12
Q

Under ground fault current conditions, inductive reactance will exert a powerful influence in directing a return (fault) Current to flow in the path that is _____ The outgoing power (“hot”) conductor.

a. In close proximity to
b. In parallel with
c. Both a & b

A

c. Both a & b

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13
Q

When the EMT is used as the EGC for a circuit, its length has no effect on the opening time of the circuit breaker protecting the circuit.

a. True
b. False 

A

b. False

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14
Q

You have installed 465 feet of PVC underground from a breaker panel to a sign. The sign circuit is protected with a 15 amp breaker. Instead of installing a ground conductor with the circuit conductors could you drive a ground rod at the base of the metal sign and bond the sign to it.

a. Yes
b. No

A

b. No

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15
Q

Some types of AC and MC cables are furnished with an integral ______ Equipment grounding conductor for the purpose of establishing an isolated ground.

a. Covered
b. Bare
c. Insulated
d. All of these

A
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16
Q

The equipment grounding conductor is normally _____ in color.

a. Light grey
b. Green
c. White
d. Black

A

b. Green

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17
Q

NEC section 250.119(A)(2) Permits an insulated conductor, larger than 6 AWG, Of a basic color other than green to be used as an equipment grounding conductor when which of the following conditions is satisfied?

a. The identification encircles the conductor
b. The likelihood of a fault is low
c. The Installation is a separately derived system
d. Ground monitors are provided

A

a. The identification Encircles the conductor

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18
Q

NEC section 250.118 permits _____ To be used as an equipment grounding conductor.

a. The armor of type MC cable
b. The armor of type AC cable
c. The steel sheath of type MI
d. All of these

A
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19
Q

You are to run a circuit underground in PVC conduit from a service panelboard to an isolated ground receptacle. The isolated ground receptacle is mounted in a metal box. Along with the circuit conductors you will pull in ______.

a. One grounding conductor and connect it to the metal box
b. Ungrounded conductor and connect it to the green screw on the receptacle
c. Both a and b
d. Neither a nor b

A

c. Both a and b

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20
Q

Grounding requirements for equipment operating at “Over 150 V to ground” Apply to which of the following voltage systems?

I. 120/240, 1phase, 3-wire. II. 120/208, 3 phase, 4-wire III. 120/240, 3phase, 4-wire

a. I, II & III
b. I & II only
c. II & III only
d. II only
e. I & III only
f. III only

A

f. III only

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21
Q

When a separate equipment grounding conductor (wire) Is installed and a metal Raceway, the wire is in _____ with the raceway.

a. Series
b. Parallel 

A

b. Parallel

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22
Q

Refer to figure 308.7. The FMC was installed to provide flexibility to this motor. Does the NEC require that an equipment grounding conductor be installed with the conduit to maintain grounding continuity?

a. Yes
b. No

A

a. Yes

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23
Q

The requirements in section NEC 250.110, To ground equipment fastened into place or connected by a permanent wiring method, exempt which of the following?

a. Double-insulated equipment
b. Fire pumps
c.Portable electrical appliances
d. None of these

A

a. Double-insulated equipment

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24
Q

When a short circuit occurs in a circuit where the conduit couplings and connectors are loose, the opening time of an OCPD ____ affected.

a. Is
b. Is not

A

b. Is not

25
Q

All of the following closure materials are suitable for use as an equipment grounding conductor, exempt for ______.

a. Aluminum
b. Steel
c. Polyvinyl chloride
d. Bronze

A

c. Polyvinyl chloride (PVC)

26
Q

NEC section 250.118(1) Permits the equipment grounding conductor to be _____.

a. Stranded
b. Solid
c. Insulated
d. All of these

A

d. All of these

27
Q

Which of the following code references list permitted types of equipment grounding conductors?

a. 250.122(F)(2)
b. 310.4
c. 250.124(A)
d. 250.118

A

d. NEC 250.118

28
Q

Which of the following is not permitted to serve as equipment grounding conductor?

a. A metallic raceway
b. A metallic cable sheath or armor
c. A bare conductor included as part of a listed cable assembly
d. A metallic water pipe system

A

d. A metallic water pipe system

29
Q

When flexible metal conduit installed to provide flexibility, such as a connection to motorized equipment or a movable light fixture does the NEC require that an equipment bonding jumper be installed with the conduit to maintain grounding continuity?

a. Yes
b. No

A

a. Yes

30
Q

Where an equipment grounding conductor is Run with the feeder or the circuit from the first building to a separate building, the size of the EGC is based on____.

a. The size of the main breaker in the service panelboard
b. The ampere Rating of the overcurrent device protecting the feeder or circuit
c. The size of the largest underground feeder or circuit conductor
d. None of these

A

b. The ampere rating of the Overcurrent device protecting the feeder or circuit

31
Q

Which of these conditions is addressed in 250.122?

I. When the circuit conductors adjusted to a size larger than required for the load or the OCPD, the equipment grounding conductor must be correspondingly adjusted in size.

II. The equipment grounding conductor is never required to be larger than the circuit conductor.

III. Where more than one circuit is installed in a raceway or cable, only a single equipment grounding conductor is required.

a. II & III only
b. III only
c. II only
d. I, II, & III
e. I only

A

d. I, II & III

32
Q

A set of three phase feeder Conductors are ran under the concrete floor in PVC to feed a distribution panel in a remote part of a large building. If the conductors are sized 1/0 AWG, protected on the supply and with a 150-ampere circuit breaker, The minimum size EGC permitted to be ran with the circuit conductors is _____ AWG.

a. 10
b. 6
c. 4
d. 3
e. 8

A

b. 6 AWG

33
Q

Refer to figure 308.7. Flex contains Three each 14 AWG conductors for the 3-phase motor. The breaker enclosure contains a 30-A, 3-pole circuit breaker. The minimum size of the equipment grounding conductor from the breaker enclosure to the motor is ______ AWG.

a. 12
b. 8
c. 10
d. 14
e. 6

A

d. 14 AWG

34
Q

The equipment grounding conductor is sized according to which of the following?

I. Cross-sectional area of the phase contactor
II. Material ( copper, aluminum, copper-clad aluminum) of the phase conductors
III. Rating of the circuit overcurrent protective devices
IV. Whether a magnetic or nonmagnetic Raceways is used

a. I & II only
b. I only
c. I & IV only
d. II & IV only
e. III only

A

e. III only

35
Q

The following circuits are installed in a single PVC conduit:
12 AWG conductors fed from a 3-pole, 20-A circuit breaker
8 AWG conductors fan from a 3-pole 50-A breaker
6 AWG conductors fed from a 3-pole 60-A breaker

The smallest EGC permitted to be installed in the PVC is ____ AWG.

a. 10
b. 8
c. 4
d. 12
e. 6

A

a. 10 AWG

36
Q

What is the smallest EGC that can be installed in EACH conduit for a feeder? The feeder conductors are connected to a 3-pole 500-amp breaker and are run in TWO separate conduits. Each conduit contains four 250 kcmil connectors.

a. 4
b. 1/0
c. 3
d. 1
e. 2

A

e. 2 AWG

37
Q

A set of three phase feeder Conductors are ran in PVC from a 225 amp breaker and we’ll feed a subpanel. The original plans called for 4/0 feeder conductors. However the sub panel it was relocated so that the feeder conductors were increased in size to 350 kcmil. With this change, the minimum size EGC permitted is ____ AWG.

a. 1/0
b. 1
c. 2
d. 3
e. 4

A

b. 1 AWG

38
Q

The phase conductors of a 400 amp ear circuit are divided into two parallel raceways. The NEC requires which of the following copper EGC’s?

a. Two 3 AWG, one in each raceway
b. Two 1 AWG, one in each raceway
c. A single 1 AWG, in either raceway
d. A single 3 AWG, on either raceway

A

a. Two 3 AWG, one in each raceway

39
Q

The one line diagram on a set of plans cars for 10 AWG wire to be ran from a three pole, 15 amp circuit breaker to a motor. What plans do not specify the grounding conductor size, but you do know that the specifications required that you polo one with each circuit. The plans only state to “ground per the NEC.” The smallest size wire you should install the circuit conductor is____ AWG

a. 8
b. 14
c. 6
d. 10
e. 12

A

d. 10 AWG

40
Q

A 250 amp, 480 V, 3-phase, three wire feeder is installed underground in PVC from one building to deliver power to a 400 amp safety switch (fused at 250 A) That is installed on another building. The feeder consists of three each 250 kcmil Conductors for the “hots.” A conduit will also contain an EGC. The smallest EDC conductor that can be installed is a ____ AWG. Neither the service nor the feeder is protected with a GFPE device.

a. 3
b. 4
c. 2
d. 6
e. 1

A

b. 4 AWG

41
Q

Refer to figure 308.23. Load #3 is a 3 phase motor and is fed with 3/0 AWG conductors. The smallest EGC you can install between the ground bar in the pull box and load #3 is _____ AWG.

a. 2
b. 3
c. 3/0
d. 1/0
e. 1

A

b. 3 AWG

42
Q

Refer to figure 308.23. The minimum size EGC between the panel and the pull box is ___ AWG.

a. 1
b. 2
c. 4
d. 1/0
e. 3

A

e. 3 AWG

43
Q

A ____ conductor is considered to be a current carrying conductor.

I. Grounded
II. Ungrounded
III. Grounding

a. I, II & III
b. II only
c. I & II only
d. I only
e. II & III only

A

c. I & II only

44
Q

Scenario 304.36
A 600-amp, 277/480-volt, 3 ph, 4 wire feeder is installed underground in PVC from one building to deliver power to a 600-A safety switch (fused at 600 A) that is installed on another building. The parallel feeder consists of two separate conduit with four each 350 kcmil conductors in each conduit.

Refer to scenario 304.36 to answer this question. The smallest EGC conductor that can be installed in each conduit is a _____ AWG.

a. 1
b. 4
c. 1/0
d. 2
e. 3

A
45
Q

The NEC requires a _____, copper-clad aluminum equipment grounding conductor for a circuit protected by a 200-ampere overcurrent protective device.

a. 1/0 AWG
b. 8 AWG
c. 4 AWG
d. None of these

A

c. 4 AWG

46
Q

The 3-phase Load shown in figure 308.24 is connected to a 3-pole, 600-A circuit breaker. There are three 350 kcmil Conductors and each run of RMC. The smallest EGC that can be installed in each conduit is ____ AWG.
a. 1
b. 3
c. 4
d. 2
e. 6

A
47
Q

Hello this is fed with 250 Kcmil Conductors in two parallel conduits for panel LC as shown in figure 205.18. The smallest equipment grounding conductor permitted to be installed in each conduit is _____ AWG. The circuit conductors are connected to a 500-amp breaker in the panel.

a. 1
b. 1/0
c. 3
d. 4
e. 2

A
48
Q

You are going to pull branch-circuit wiring through EMT for a 120/208 V, 3-phase, 4 wire panel out to a 12 x 12 J box. They will be 520 amp multi wire branch circuits. Because you will be installing 20 wires in the EMT you will be installing 8 AWG wire Instead of 12. The largest wire is due to the pasty correction required for the number of conductors in the conduit. The smallest EDC you are permitted to install with the circuit conductors is _____ AWG.

a. 6
b. 14
c. 8
d. 10
e. 12

A
49
Q

Walkways formed by heavy planking shall be provided and used by employees while performing manual demolition.

a. True
b. False

A

a. True

50
Q

During demolition operations, the dust produced may contain _____ Or other hazardous dust that you need to consider in your PPE requirements.

a. Lead
b. Asbestos
c. Silica
d. Any of these

A

d. Any of these

51
Q

Designated _____ Are permitted to be used to gain access to a structure during demolition operations.

a. Passageways
b. Stairways
c. Ladders
d. Any of these

A

d. Any of these

52
Q

During demolition operations, debris dropped through holes in floors requires these openings to be barricaded at ____ Inches above the working level and at least 6 feet back from the edge of the holes.

a. 96
b. 42
c. 72
d. 60

A

b. 42

53
Q

Prior to permitting employees to start demolition operations, and engineering survey shall be made by A competent person to determine _____.

a. The condition of the framing, floors, and walls within the structure
b. The possibility of unplanned collapse of any portion of the structure
c. Both a and b

A

c. Both a & b

54
Q

During demolition operations, debris dropped through a hole in the floor requires these openings to be barricaded at 42 inches above the working level and at least ______ Back from the edge of the holes.

a. 4 feet
b. 3 feet
c. 42 inches
d. 6 feet
e. 18 inches

A

d. 6 feet

55
Q

Each utility provider shall be notified _____ of demolition operations.

a. At the completion
b. in advance

A

b. In advance

56
Q

When employees are required to work within a structure to be demolished that has been damaged by _____ Or other cars, the walls or floor shall be shored and braced.

a. Explosion
b. Flood
c. Fire
d. Any of these

A

d. Any of these

57
Q

During demolition operations at multi story buildings, the stairwells shall be illuminated for safe passage.

a. True
b. False 

A

a. True

58
Q

Subpart T of OSHA’s standards for construction covers _____-type demolition operations.

a. Manual
b. Explosive
c. Either a or b

A

a. Manual