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CM 2112 > Electrical Vocab > Flashcards

Electrical Vocab Flashcards

1
Q

Metal, plastic or fiber pipes designed to protect electrical cables and wires.

A

Electrical conduit:

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2
Q

A thick-walled threaded tubing, usually made of coated steel, stainless steel or aluminum.

A

Rigid Metal Conduit (RMC):

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3
Q

A galvanized steel tubing, with a tubing wall that is thick enough to allow it to be threaded.

A

Galvanized rigid conduit (GRC):

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4
Q

A thin-walled metal raceway having a circular cross section; used to pull in or withdraw electric cables or wires after the tubing is installed in place; uses connectors and couplings other than the threaded type.

A

Electrical Metallic Tubing (EMT):

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5
Q

A flexible raceway of circular cross section for pulling electric cables through.

A

Flexible Metallic Conduit (FMC):

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6
Q

A metallic flexible conduit covered by a waterproof plastic coating.

A

Liquidtight Flexible Metallic Conduit (LFMC):

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7
Q

A type of rigid conduit generally used in commercial and industrial applications where a higher resistance to corrosion is needed.

A

Aluminum Conduits:

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8
Q

The lightest in weight compared to other conduit materials, and usually lower in cost than other forms of conduit.

A

Polyvinyl Chloride Conduits (PVC):

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9
Q

Refers to several types of flameresistant non-metallic tubing. Interior surfaces may be smooth or corrugated. There may be integral reinforcement within the conduit wall.

A

Liquidtight Flexible Nonmetallic Conduit (LFNC-B):

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10
Q

A thin-walled corrugated tubing that is moistureresistant and flame retardant.

A

Electrical Nonmetallic Tubing (ENT):

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11
Q

Fittings used for connecting runs of conduit together, and for connecting conduit ends to boxes, enclosures or electrical devices.

A

Conduit Fittings:

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12
Q

Tubular units with openings at each end for admitting conduits, and providing access to the wires.

A

Conduit Bodies:

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13
Q

Conduit fittings commonly called ‘factory bends’ or ‘elbows’.

A

Bends:

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14
Q

Conduit fitting used to securely link together lengths of conduit and attaching
sitefabricated bends.

A

Coupling:

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15
Q

Conduit fittings used to prevent drips and water-logging in the conduit runs, especially in areas where the temperature varies significantly, or the conduit runs from a warm area to a cooler one, and moisture in the air starts condensing.

A

Drains:

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16
Q

Conduit fittings used to create a smooth entry point to conduits without any sharp edges, protecting the conductors from damage during wire pulls. Installed on the inside of the box opening and threaded into the conduit end, separating the conductors from the edges of both the opening and the conduit end.

A

Bushings:

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17
Q

Conduit fittings threaded on the inside, with teeth on one surface or both, which grip the surface. Installed on both sides of an opening to ensure that both the conduit and bushing are held firmly in place.

A

Locknuts:

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18
Q

Conduit fitting with two separate heads and a locking mechanism which can connect two pieces of conduit together, even if they can’t be physically turned

A

Unions:

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19
Q

Conduit fittings that do not exceed 24 inches in length, these are threaded on both ends and can be installed quickly and easily. Used for short runs or between nearby enclosures.

A

Nipples:

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20
Q

Fitting used to connect conduits to bus boxes or enclosures that don’t have a factorythreaded entry.

A

Hubs:

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21
Q

Special combination coupling that allows connection of raceways of one trade size to larger or smaller ones.

A

Reducers:

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22
Q

Threaded reducers, similar to hubs, except both the inner and outer surfaces are threaded. Used to connect conduits to enclosure or box openings that have a larger diameter with locknuts on both sides to fasten them in place.

A

Reducing washers:

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23
Q

Used to mount the conduit to ceilings or walls using a screws or bolts.

A

Straps:

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24
Q

To fasten conduit runs to fixed structures, like beams, hangers or unistrut channels.

A

Clamps:

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25
Q

A brand name of construction strut channel.

Enclosed conduit that forms a physical pathway for electrical wiring.

A

Unistrut:

Raceway:

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26
Q

A single electrical conductor.

A

Electrical Wire:

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27
Q

Two or more wires running side by side and bonded, twisted, or braided together to form a single assembly, the ends of which can be connected to two devices, enabling the transfer of electrical signals from one device to the other.

A

Electrical Cable:

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28
Q

regulates the manner of installation and the types of wires and cables for various electrical applications.

A

NEC: The National Electrical Code,

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29
Q

The letters THHN, THWN, THW and XHHN represent the main insulation types of individual wires.

A

Wire Lettering:

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30
Q

T (wire lettering):

A

Thermoplastic insulation

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31
Q

H (wire lettering):

A

Heat resistance

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32
Q

HH (wire lettering):

A

High heat resistance (up to 194°F)

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33
Q

W (wire lettering):

A

Suitable for wet locations

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34
Q

N (wire lettering):

A

Nylon coating, resistant to damage by oil or gas

35
Q

X (wire lettering):

A

Synthetic polymer that is flame-resistant

36
Q

An electrical cable composed of two insulated aluminum wires wrapped with a third bare wire which is used as a common neutral.

A

Triplex Wires:

37
Q

Main power feeder wires are the wires that connect the service weather head to the building. Should be rated for 25% more than the actual load.

A

Main Feeder Wires:

38
Q

Connection point on building that is used to electrically connect the building to the utility.

A

Weather head:

39
Q

Electric wires used to power the main junction box and the circuit breaker panels. Should be rated for 25% more than the actual load.

A

Panel Feed Wires:

40
Q

2-3 conductor wire used for instrumentation.

A

Non-Metallic Sheathed Wires:

41
Q

The size of the wire.

A

Wire gauge:

42
Q

The amount of electric current that can flow through a wire.

A

Ampacity:

43
Q

The load a wire can take.

A

Wattage:

44
Q

Known as non-metallic building wire or NM cables. They feature a flexible plastic jacket with two to four wires and a bare wire for grounding.

A

Non-Metallic Sheathed Cable:

45
Q

Similar to NM cables, but wires are grouped together and embedded in the flexible material. They feature three plain stranded copper wires (one wire for the current, one grounding wire and one neutral wire) that are insulated with cross-linked polyethylene, PVC bedding and a black PVC sheathing.

A

Underground Feeder Cable:

46
Q

Also known as armored or BX cables, they are often used to supply mains electricity or for large appliances. They feature more than one conductor, each of which is insulated individually.

A

Metallic Sheathed Cable:

47
Q

The two inner shields share the same geometric axis. They feature a tubular insulating layer that protects an inner conductor which is further surrounded by a tubular conducting shield, and might also feature an outer sheath for extra insulation.

A

Coaxial Cable:

48
Q

Consist of two wires that are twisted together.

A

Unshielded Twisted Pair Cable:

49
Q

Often used in computers and peripherals, with various conducting wires that run
parallel to each other on a flat plane, leading to a visual resemblance to flat ribbons.

A

Ribbon cables:

50
Q

Specially-designed coaxial or bundled fiber-optic cables, which do not require any added sheathing, insulation or piping before being buried underground. They feature a heavy metal core with many layers of banded metal sheathing, heavy rubber coverings, shock-absorbing gel and waterproof wrapped thread-fortified tape.

A

Direct-Buried Cable (DBC):

51
Q

These are flat two-wire cables that are used for transmission between an antenna and receiver, like TV and radio.

A

Twin-Lead Cable:

52
Q

A variant of coaxial cables, which features two inner conductors instead of one and is used for very-short-range high-speed signals.

A

Twinaxial Cable:

53
Q

With two individually insulated conductors, this cable is normally used in DC or low-frequency AC applications.

A

Paired Cable:

54
Q

Similar to paired cables, but the inner insulated wires are twisted or intertwined.

A

Twisted Pair:

55
Q

Color coding of cable insulation is done to determine active, neutral and
earth conductors.

A

Cable Color Code:

56
Q

The gauge of individual wires within the cable, such as 14, 12, 10 etc. (the bigger the number, the smaller the size).

A

Cable size:

57
Q

Explosion Proof Enclosures
Boxes or cabinets which are used to contain electrical components like knobs, switches, controls and the like, to protect them from the environments, as well as safeguard property and life.

A

Electrical enclosures:

58
Q

NEMA:

A

National Electrical Manufacturers Association.

59
Q

In places where the spark or heat from electrical equipment can cause an
explosion or start a fire, the components are housed in purpose-built electrical enclosures.

A

Explosion Proof:

60
Q

Define hazardous location codes based on both the cause and the nature of the hazardous environment.

A

NEMA Standards 250-2003:

61
Q

Automatically operating safety switches which operate by measuring heat or current flowing through the circuit.

A

Circuit breakers:

62
Q

The external shell of a circuit breaker that encases the other parts.

A

External Casing:

63
Q

Circuit breaker where both the contacts are submerged in insulating
mineral oil.

A

Oil-Based Circuit Breaker:

64
Q

Circuit breaker that can be used for low-voltage and some medium-voltage circuits too. Being classified into two types - plain air and air blast.

A

Air circuit breaker:

65
Q

Circuit breaker that uses heat as a measure of current flowing through a circuit and disconnect once it reaches beyond a certain temperature.

A

Thermal circuit breaker:

66
Q

Circuit breaker that relies on electromagnetic energy created by electricity to trip a switch and disconnect power supply.

A

Magnetic Circuit Breaker:

67
Q

Circuit breakers that combine both magnetic and thermal circuit breakers, they combine the advantages of both.

A

Hybrid Circuit Breaker:

68
Q

IEC:

A

International Electrotechnical Commission.

69
Q

According to the IEC, circuit breakers for controlling highpower transmission lines are rated for 72.5 KV and higher.

A

High Voltage Circuit Breakers:

70
Q

Circuit breakers rated between 1 and 72 KV.

Circuit breakers used when the maximum voltage is about 1000Vac, and include miniature circuit breakers (MCB).

A

Medium Voltage (MV) Circuit Breakers:

Low Voltage Circuit Breakers:

71
Q

Connectors used to join electrical circuits (wires and cables) to form a continuous path for electrical current to flow.

A

Electrical connectors:

72
Q

The structure or case used to contain the terminals, ensure stability of the connections, and protect the electrical contacts from short-circuiting and environmental hazards.

A

Housing:

73
Q

The pins in a connector which provide electrical conduction to make the connections secure.

A

Terminals:

74
Q

Heavy duty rings made from high grade electrolytic copper and are available in sizes ranging from #8AWG to 4/0AWG in a wide range of mounting holes. They have tin plating that provides resistance against corrosion and the terminals are CSA and UL listed.

A

Lugs:

75
Q

Typically ring-shaped power connections with two screws or with four screws usually made of high-grade electrolyte copper or aluminum.

A

Mechanical lugs:

76
Q

Stud-type input power connections that are generally made of high conduction wrought copper or aluminum.

A

Compression lugs:

77
Q

Heavy duty lugs that are used for wires on transformers or steel structures.

A

Grounding lugs:

78
Q

A group of devices that govern the performance of an electric motor in a predefined manner (e.g., starting/stopping the motor, regulating rotation speed).

A

Motor controls:

79
Q

Devices used to control motors, named for the operations they control Reduced Voltage

A

Motor control devices:

80
Q

Two or more starters used for starting a motor in reduced voltage
conditions.

A

Starters:

81
Q

Unified combination of devices that enable operators to drive as well as adjust the operating speed of a mechanical load.

A

Adjustable-Speed Drives:

82
Q

Using advanced microprocessors for controlling the power of electronic devices employed in an electric motor, these controllers monitor the load exerted on a motor and match torque to the recorded load accordingly.

A

Intelligent Controllers:

83
Q

A unit or assembly of units or sections and associated fittings forming a rigid structural system used to securely fasten or support cables and raceways.

A

Cable Tray System:

CM 2112 (12 decks)

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