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Electrical Holy Shit > Chapter 25 > Flashcards

Chapter 25 Flashcards

1
Q

An electrical device used to stop, start, or redirect the flow of current in an electrical circuit.

A

Switch

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2
Q

The information provided on the back of a switch can be in what form?

A

color coding

abbreviations

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3
Q

What colors are use to identify screw terminals on switches?

A

bronze, silver, and green

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4
Q

Power will always come into a switch by the _____and leave the switch by the _____.

A

common

traveler terminal

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5
Q

What color is the common screw on a switch?

A

It is usually black or a darker color

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6
Q

What color is the traveler terminal on a switch?

A

The traveler terminal is usually bronze or silver

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7
Q

What color is the ground terminal on a switch?

A

The ground terminal is usually green

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8
Q

What inscribe information is on the back of a switch?

A
  1. wire to be used
  2. voltage
  3. current ratings
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9
Q

A stamped or printed icon that indicates that a device or material has been approved for consumer use.

A

UL or underwriters laboratories stamp

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10
Q

Underwriters laboratories inc. was created by?

A

National Board of Fire Underwriters

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11
Q

Indicates the minimum safety requirements and is not meant to serve as a quality comparison between manufacturers.

A

UL label

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12
Q

What is a CSA label?

A

is a marking that indicates that extensive tests have been conducted on a device by the Canadian standards association.

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13
Q

Is an electrical symbol that represents copper and aluminum respectively.

A

Conductor symbol

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14
Q

When a device is marked ___, the device can be used with copper or aluminum wire.

A

CU/AL

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15
Q

What happens aluminum wire is used with copper connectors?

A

The typical result is overheating, but electrical fires due to the chemical reaction between the dissimilar metals are also possible.

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16
Q

What is the maximum current rating of a switch for residential use?

A

the maximum current rating of a residential switch is 15A or 20A.

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17
Q

What is the maximum voltage rating for a residential switch?

A

120V

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18
Q

What does AC mean?

A

Alternating Current

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19
Q

Switches used to control loads with a tungsten filament (such as standard incandescent lamps) must be marked with ____.

A

a letter T

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20
Q

is a special switch information that indicates a switch is capable of handling the severe overloading created by a tungsten load as the switch is closed.

A

T rating

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21
Q

What happens to the resistance of Tungsten when it is cold?

A

it is low

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22
Q

What happens to the resistance of tungsten when it is heated?

A

it increases

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23
Q

At the moment a switch is closed, the low resistance of a tungsten load causes draw to be _____ time the normal operating current.

A

8 to 10

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24
Q

Once a switch is closed, the tungsten filament (load) heats up and the current flow _____.

A

drops immediately

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25
Q

The process of heating up a tungsten filament takes how long?

A

1/240 of a second

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26
Q

Failure to observe the T rating of a switch will do what to the switch?

A

reduce it’s life expectancy

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27
Q

Where is a strip gauge located on a switch?

A

on the back rear portion a back-wired switch

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28
Q

A short groove that indicates the amount of insulation that must be removed from a wire so the wire can be properly inserted into a switch.

A

Strip gauge

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29
Q

When too much insulation is removed, bare wire is left exposed and can cause _____.

A

A short

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30
Q

What are the common switches use din residences?

A

single pole, three-way, four-way, and double-pole switches

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31
Q

Is set to the times that the switch is turned ON and OFF.

A

Timer switch

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32
Q

Allows a sequence of events to be established, such as turning lights ON when no one is home.

A

programmable switch

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33
Q

Are used as security devices or energy savers.

A

motion sensor switches.

34
Q

Is a control device used to turn lights or appliances ON and OFF for a single location.

A

Single pole switch

35
Q

What is the hot side of a circuit referred to?

A

leg

36
Q

As a general rule, neutral conductors (white wires) are not used as what?

A

a leg in a switch loop

37
Q

Not switching the neutral conductor is an easy rule to follow for conduit systems but does not apply to what systems?

A

Armored and nonmetallic sheathed cable

38
Q

When armored or nonmetallic cable is used, an identified white conductor can be used as the feeder conductor from the switch. This is approved by who?

A

The NEC

39
Q

When using armored or nonmetallic cable a load lamp must be ____.

A

controlled from two locations

40
Q

Used in pairs to control light or load from two locations.

A

Three-way switches

41
Q

What are the terminals of a three-way switch identified as?

A

common, traveler A, traveler B

42
Q

The single terminal at one end of a switch is the ____ terminal.

A

common

43
Q

Is easily identified because the terminal is darker than the other terminals or is black.

A

The common terminal

44
Q

The positive or hot wire of a circuit is always connected to the ______.

A

darker terminal

45
Q

What do the connecting point for the two traveler wires do?

A

connect paired switches together

46
Q

A three-way switch is really _______ switches. When the handle is down, contact is made with terminal 1. When the handle is up, contact is made with terminal 2.

A

two-position switches

47
Q

Have no ON and OFF markings.

A

Three-way switches

48
Q

What is a four-way switch?

A

A four-way switch is used in combination with two three-way switches to allow control of a load from three locations. One or more four-way switches are used with two three-way switches to provide control of a load from three or more locations.

49
Q

What is the most popular type of four-way switch?

A

The through-wired type

50
Q

Any number of four-way switches can be connected to a circuit, but what rule must be followed?

A

All four way switched must be connected between two three-way switches.

51
Q

Two four-way switches can be used and two three-way switches may be used to control a light from four locations, but what rule must be followed?

A

The two four-way switches must always be wired between the two three-way switches.

52
Q

What is a double pole switch?

A

A double-pole switch is a device that consists of two switches in one package for controlling two separate loads.

53
Q

These switches are designed to disconnect, or connect (open or close) at the same time.

A

Double pole switches

54
Q

When are double-pole switches common?

A

Double-pole switches are common for 230 V circuit where both conductors are hot conductors.

55
Q

Double-pole switches look similar to four-way switches but they have one distinct difference which is what?

A

They have ON and OFF markings.

56
Q

Is a contact device installed for the connection of plugs and flexible cords to supply current to portable electrical equipment.

A

Receptacles

57
Q

What does the shape and position of a receptacles slots mean?

A

The shape and position of a receptacles slots differentiate between 15 A, 125 V receptacle and a 15 A, 250 V receptacle.

58
Q

This receptacle has connection slots that are vertical and typically different lengths.

A

A 125 V receptacle

59
Q

This receptacle has connection slots that are horizontal and the same size.

A

A 250V receptacle

60
Q

What is a 125 V receptacle with different sized slots called?

A

Polarized receptacle

61
Q

Is a receptacle in which the size of the connection slot determines the plug connection. The short connection slot is the hot connection and the long connection slot is the common connection.

A

polarized receptacle

62
Q

What determines the number of contacts and the configuration in which the slots are positioned on a receptacle?

A

Ratings

63
Q

What type of plugs are receptacle designed for?

A

Straight blade or locking type plugs

64
Q

These receptacles are more common in commercial and industrial applications than residential work.

A

Locking type receptacles

65
Q

A silver colored screw on a receptacle indicates what?

A

neutral terminal

66
Q

A bronze colored screw indicates what on a receptacle?

A

not terminal

67
Q

A green colored screw indicates what on a receptacle?

A

ground

68
Q

Receptacles marked with 20 A, 125 V are typically required for ____________.

A

laundry and kitchen circuits

69
Q

Typical residential receptacles are marked _____.

A

15A 120V

70
Q

Receptacles marked CU are only used for what?

A

solid copper wire

71
Q

Receptacle marked CU-CLAD are used with what type of wire?

A

copper-collated aluminum wire

72
Q

Receptacles marked with CO/ALR are used with _____.

A

solid aluminum wire

73
Q

What are the typical receptacles found in a residence?

A

standard, isolated ground, split-wired, and GFCI

74
Q

Include a long neutral slot, a short hot clot, and a U-shaped ground hole.

A

Standard receptacles

75
Q

A _____ between the two hot and two neutral screw terminals provides electrical connection between the terminals.

A

Connecting tab

76
Q

How do you wire a 120V duplex receptacle?

A

When wiring a 120 V duplex receptacle, the black or red (hot) wire is connected to the brass-colored screw, and the white wire is connected to the steel-colored screw, and the green or bare wire is connected to the green screw.

77
Q

Is a standard receptacle that has the tab between the two brass-colored (hot) terminal screws removed. The tab between the two steel-colored neutral screws is not removed.

A

Split-wired receptacles

78
Q

What is the purpose of a split wired receptacle?

A

To provide a standard and switched circuit or two separate circuits at the same duplex outlet.

79
Q

Is a special receptacle that minimizes electrical noise by providing a separate grounding path for each connected device. These receptacles are identified with an orange color.

A

isolated-ground receptacles

80
Q

Is a fast-acting receptacle that detects low levels of leakage current to ground and opens the circuit in response to the leakage.

A

GFCI receptacles

81
Q

Any current above the level that is required for a dangerous shock.

A

ground fault

82
Q

To properly trim out a switch or receptacle it must be properly covered with a ______.

A

receptacle cover

Electrical Holy Shit (13 decks)

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