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ICA > Module 2 Test Questions Electrical Study Deck > Flashcards

Module 2 Test Questions Electrical Study Deck Flashcards

1
Q

Service entrance conductors run from the service drop to the service box or service panel. T/F

A

True

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2
Q

The service size is determined by the amperage and voltage ratings of the service. T/F

A

True

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3
Q

Is the service drop overhead or underground?

A

overhead

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4
Q

Are service laterals overhead or underground?

A

underground

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5
Q

The drip loop is typically part of the service drop. T/F

A

False

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6
Q

The wire size for the service drop must be the same as the wire size for the service entrance conductors. T/F

A

False

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7
Q

How many wires would you typically find in a 240-volt service drop?

A

3

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8
Q

What would 4 wires mean?

A

Three phase electricity

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9
Q

What would 2 wires usually mean?

A

120 volts service

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10
Q

List 7 common problems with service drops.

A

overhead wires too low, damaged or frayed wires, trees or vines interfering with wires, wires too close to doors or windows, wires not well secured to the house, poor connection between service drop & service entrance, inadequate clearance from roofs

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11
Q

List clearances above ground, swimming pools, and roofs.

A

above roadway-18 ft
above driveway-12 ft
above flat roof-8-10 ft
above sloped roof-18 inches
away from water in pool-22 1/2 ft in any direction
3 feet above sloped roof w/pitch greater than 4 in 12
above walkway-10 ft

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12
Q

The service entrance conductors run from the __ to the __.

A

from service drop to the service box

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13
Q

All service entrance conductors must be in conduit. T/F

A

False

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14
Q

All service entrance conductors must be attached above roof level. T/F

A

False

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15
Q

The drip loop should be as close to the roof surface as possible. T/F

A

False

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16
Q

List 10 common problems with service entrance conductors.

A

No drip loop
No mast head
Mast head not weather-tight
Mast or conduit bent
Mast or conduit rusted
Mast rotted

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17
Q

List 4 common areas of water penetration into service entrances.

A

Conduit joints, mast head, roof flashing, meter base

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18
Q

List 2 functions of the drip loop.

A

prevents water entry into the conduit or service entrance, shows that the service drop wires are not straining the splice (???)

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19
Q

Roughly 999 out of 1,000 houses have __ volts available

A

240

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20
Q

Roughly 999 out of 1,000 houses have __ service entrance wires

A

Three

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21
Q

Load calculations are part of a home inspection. T/F

A

False

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22
Q

Implications of an undersized service include:
a. shock hazard
b. fire hazard
c. shock & fire hazard
d. melting insulation
e. nuisance tripping of the main fuses or breakers

A

nuisance tripping of the main fuses or breakers

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23
Q

What is the largest single-phase service that you are likely to find in a home?

A

400 amps

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24
Q

What size copper wire would you expect to find on the service entrance for:
a. A 60-amp service
b. A 100-amp service
c. A 200-amp service

A

a. 6 gauge
b. 4 gauge
c. 2-0 gauge

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25
Q

Which of the following is a reliable way to identify the service size? (Need answer choices)

A
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26
Q

Aluminum is an acceptable service entrance conductor material. T/F

A

True

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27
Q

A fused 200-amp service has two 100-amp fuses in the service box. T/F

A

False

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28
Q

If you can’t read the size of the fuses in the service box, you should remove them to try to get a better look. T/F

A

False

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29
Q

Which of the following is a safety issue?
a. main fuses have lower rating than service entrance wire
b. main fuses have higher rating than service entrance wires
c. service box has higher rating than service entrance wires
d. service box has same rating as service entrance wires
e. distribution panel has larger rating than service entrance wires

A

main fuses have higher rating than service entrance wires

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30
Q

Service box can be inside, outside or in a garage. T/F

A

True

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31
Q

There can be up to 10 throws to disconnect all of the electricity in….. T/F

A

False

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32
Q

The service box may stand alone or may be combined with the…panel T/F

A

True

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33
Q

List 16 common conditions you might find in a service box

A

poor access/location, loose, rust or water in box, unprotected opening, damaged parts, overheating, poor connections, illegal taps, neutral wire by -passes service box, fused neutral wire, obsolete box, box not rated for aluminum

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34
Q

The functions of earth grounding systems include:

A

grounding systems can help dissipate electricity from lightning, grounding systems can help avoid the build up of static electricity

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35
Q

The grounding electrode conductor may be called:

A

grounding electrode conductor is the ground wire

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36
Q

You are allowed to ground to the gas piping. T/F

A

False

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37
Q

The grounding systems are connected to the house neutral at the __.

A

service box

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38
Q

From the point where the ground and the neutral wires connect, there are two paths to ground. What are they?

A

through the neutral service wire or through the grounding electrode conductor to water pipes or ground rods

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39
Q

List 5 destinations where ground wires can terminate.

A

metal water supply pipes
metal rods driven into the ground
wires buried in the footings of buildings
buried grounding plates
frames of metal buildings
metal well casings

40
Q

List 12 common problems found with grounding systems.

A

no grounding
ground wire attached to plastic pipes
ground wire after meters & valves with no jumper
spliced ground wire
poor connection
ground connections not accessible
ground rod cut off
corroded ground rod
undersized ground wire
neutral bonded to ground wire after service box
service box not bonded to ground wire
no ground in sub panel feeder wires

41
Q

Distribution panels are also called (6 if you can):

A

service panels, panelboards, auxiliary panels, sub panels, fuse boxes, fuse panels, breaker panels

42
Q

Wires run directly from the service box to the branch circuits. T/F

A

False

43
Q

What is the advantage of a 240-volt circuit?

A

more electricity can flow at lower amperage ratings

44
Q

What size copper wires are adequately protected by:
a. 15-amp breaker
b. 20-amp breaker
c. 30-amp breaker
d. 40-amp breaker

A

a. 15-amp breaker-14 gauge
b. 20-amp breaker-12 gauge
c. 30-amp breaker-10 gauge
d. 40-amp breaker-8 gauge

45
Q

What size wire is found on most general purpose outlets for lights and receptacles?

A

14 gauge

46
Q

Which of the following is a safety concern?
a. fuse too small
b. fuse too big

A

fuse too big

47
Q

Subpanels must be immediately adjacent to the main panel. T/F

A

False

48
Q

Typical distribution panels have 60 circuits T/F

A

False

49
Q

Do we normally shut off power when looking at an electrical system in a house? Why or why not?

A

We do not shut off power. This would be a significant inconvenience to the occupant.

50
Q

List 14 conditions that may be found in all panels

A

obsolete and/or fused neutrals
damaged panel
loose or missing door
openings in panel
panel too small
overheating
rust or water in panel
circuits not labeled
panel crowding
poor access
upside down

51
Q

Explain why fused neutrals are a bad idea.

A

dangerous because the fuse on the neutral side only blows. The circuit may not work, but there may be voltage throughout the entire circuit

52
Q

What is the implication of a panel that is too small for the service?

A

panel may overheat

53
Q

Should the neutral & the ground wires be bonded together at the subpanel?

A

No. Electricity may flow through the ground wire under normal circumstances. The ground wire should be reserved for emergency situations.

54
Q

How should the feeder wires to a subpanel from the main panel ideally be protected?
a. no fusing necessary
b. main house fuses or breakers will protect wire
c. fuses should be provided at subpanel
d. fuses should be provided at main panel
e. none of the above

A

fuses should be provided at main panel

55
Q

What are implications of oversized breakers?

A

oversized breakers will allow wires to overheat w/out tripping

56
Q

What does the term “double tap” mean?

A

2 wires connected to single terminal

57
Q

The red and black wires of multi-wire circuits should be on separate bus bars. T/F

A

True

58
Q

List 4 common problems found only with breakers

A
  1. multi-wire circuits not linked
  2. too many breakers
  3. wrong breaker in panel
  4. loose breakers
59
Q

List 6 problems found with wires in panels

A
  1. sheathing not removed
  2. overheating
  3. loose connections
  4. damaged
  5. not well secured
  6. wires crossing bus bars
  7. abandoned wires in panel
60
Q

What is a split receptacle?

A

split receptacle has the top part of the outlet on one circuit and the bottom part on a different circuit

61
Q

What is meant by linking in multi-wire branch circuits?

A

linking means that the fuses or breakers for multi-wire branch circuits have to be shut off in pairs

62
Q

List 2 different branch wire materials you might see

A

copper, aluminum

63
Q

Describe 3 different cable types you might see

A
  1. NM, Romex, Loomex
  2. UF
  3. BX, armored cable
  4. Knob-and-Tube
64
Q

What is the difference between insulation and sheathing?

A

Insulation is around the individual wires, and sheathing forms the cables by wrapping around the insulated wires

65
Q

The most common wire size for branch household circuits is __ gauge

A

14

66
Q

What are the issues on running wire through steel studs?

A

Wire may be damaged by sharp edges of steel studs. Wires passing through holes should be protected with grommets, for example, wires running parallel to studs should stand off the studs

67
Q

List 5 common branch circuit wire problems

A

damaged, not well secured, loose connections, open splices, wires too close to ducts, pipes, vents, wires run through steel studs w/out protection, abandoned wire, cable used outdoors, exposed wire in attic, undersized wire

68
Q

Give 4 examples of damaged wire.

A

cut or pinched, chewed on by animal, burned wire, brittle or cracked insulation

69
Q

List 3 methods for securing wire ends.

A
  1. terminal screws
  2. push-in connectors
  3. solderless connector
70
Q

What is meant by open splice?

A

open splice is a connector that is not made ….?????

71
Q

Wire should be _ inches away from edge of studs

A

1 1/4”

72
Q

A grommet is:

A

fitting that protects cable from………studs…..?

73
Q

Wires should not be run on wall surfaces without___.

A

mechanical protection

74
Q

What is the problem with running wires across the top of the attic ceiling joists?

A

not visible and may be stepped on

75
Q

Abandoned wire should be__

A

removed

76
Q

Describe how knob-and-tube wiring is visibly different from modern cable?

A

Need complete answer

77
Q

Does knob-and-tube wiring have a ground wire associated with it?

A

No

78
Q

List 4 common problems with knob-and-tube wiring

A

connectors not in boxes, brittle, buried in insulation, fused neutrals

79
Q

List 3 common problems found with aluminum wiring

A

connectors not compatible with aluminum, no anti-oxidant grease on stranded wire, overheating

80
Q

How would you identify aluminum wiring?

A

the conductor itself is silver colored. The sheathing usually has the word aluminum, alum or Al

81
Q

When was aluminum wiring used?

A

aluminum wiring was used from the mid 1960s to the late 80s

82
Q

What caused problems with aluminum wiring?

A
  1. tends to creep out from under terminal screws
  2. forms corrosion that is an electrical insulator
  3. is softer than copper & easier to damage when working with the wire
  4. was, in some of early material, low quality wire prone to weakness & breaking
83
Q

Where is the anti-oxidant grease typically used?

A

anti-oxidant grease is typically used on stranded aluminum wires

84
Q

List 12 common lighting problems fond in houses?

A

damaged, loose, overheating, inoperative, obsolete, not grounded, missing, poor stairway lighting, heat lamps over doors, isolating links needed on pull chains, improper closet lighting

85
Q

How are lights tested?

A

by turning them on and off by their switches

86
Q

Why should heat lamps not be located over doors?

A

A towel thrown over the door may be ignited by a heat lamp

87
Q

List 14 common receptacle problems

A

damaged, loose, overheating, ungrounded outlets, open neutral or open hot connections, reversed polarity outlets, inoperative, wrong type receptacle, no GFIs, overheated neutral on split receptacles, worn receptacles, broken pin or blade in slots, too far from basins

88
Q

Describe how you would test a GFI receptacle during an inspection

A

use a conventional circuit tester and operate the test button on the receptacle

89
Q

Explain the problem with reversed polarity

A

the collar of a light fixture may be energized, increasing the risk of electrical shock when changing a light bulb

90
Q

Can an outlet be protected by a ground fault interrupter without it being apparent?

A

yes, all outlets downstream of a GFI outlet will be protected

91
Q

Outlets should be close to basins. T/F

A

True

92
Q

List 4 common problems found with switches

A

damaged, loose, overheating, inoperative

93
Q

All junction boxes should be concealed. T/F

A

False

94
Q

List 7 common junction box problems.

A

damaged, missing, loose, not grounded, cover loose or missing, crowded, concealed boxes

95
Q

Knob-and-tube wiring was commonly installed without junction boxes. T/F

A

True

96
Q

One smoke detector is needed in each home, near the kitchen because that’s where most house fires start. T/F

A

False

ICA (26 decks)

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