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BU 2 > Glossary of Electrical Terms > Flashcards

Glossary of Electrical Terms Flashcards

1
Q

a metal or plastic box with a blank cover for insertion into a conduit run, raceway, or metallic tubing, which facilitates the drawing of conductors

A

pull box

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2
Q

a channel for holding wires or cables; constructed from metal, wood, plastics, rigid metal, electrical metal tubing, cast-in-place, underfloor, surface metal, surface wooden types, wireways, busways and auxiliary gutters

A

raceway

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3
Q

constructed, protected or treated so as to prevent rain from interfering with the successful operation of the apparatus under specified test conditions

A

rainproof

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4
Q

constructed or protected so that exposure to a beating rain will not result in the entrance of water under specified test conditions

A

raintight

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5
Q

is the voltage to which operating and performance characteristics are referred

A

rated voltage

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6
Q

is a contact device installed at the outlet for the connection of an attachment pulg

A

receptacle

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7
Q

an outlet where one or more receptacles are installed

A

receptacle outlet

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8
Q

a device that converts alternating current to direct current

A

rectifier

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9
Q

a physical property that opposes current and dissipates real power in the form of heat

A

resistance

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10
Q

a circuit that provides a complete path for current and has its components connected end-to-end

A

Series circuit

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11
Q

service conductors made up in the form of a cable

A

service cable

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12
Q

the conductors from the service point to service disconnecting means

A

service conductors

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13
Q

the overhead service conductors from the last pole or other aerial support to and including the splices, if any, connecting to the service entrance conductors at the building and other stuctures

A

service drop

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14
Q

the service conductors between the terminals of the service equipment and a point usually outside the building, clear of building walls , where joined by tap or splice to the service drop

A

service entrance conductors (Overhead system)

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15
Q

the service conductors between the terminals of the service equipment and the point of connection to the service lateral

A

service-entrance conductors (underground system)

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16
Q

the necessary equipment, usually consisting of a circuit breakers, or switches and fuses and their accessories connected to the load end of service conductors to a building or other structure or an otherwise designated area and intended to constitute the main control and cutoff of the supply

A

service equipment

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17
Q

the underground service conductors between the street main, including any risers at a pole or other structure or from the transformers, and the first point of connection to the service entrance conductors in a terminal box or meter other enclosure, inside or outside the building wall

A

service lateral

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18
Q

the point of connection between facilities of the serving utility and the premises wiring

A

servie point

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19
Q

the raceways that encloses the service-entrance conductors

A

service raceways

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20
Q

the value of the current at which the circuit breaker is set to trip

A

setting

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21
Q

a generator for providing emergency power during power outage; sometimes called emergency generator

A

standby generator

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22
Q

a protective device for limiting surge voltage on equipment by discharging or bypassing surge current; it prevents continuous flow of follow current to ground and is capable of repeating these functions as specified

A

surge arrester

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23
Q

the reciprocal of impedance

A

admittance

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24
Q

a transformer cooled by forced circulation of air through its core and coils

A

air blast transformer

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25
Q

a circuit breaker in which the interruption occurs in air

A

air circuit breaker

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26
Q

a switch in which the interruption of the circuit occurs in air

A

air switch

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27
Q

a periodic current, the average value of which over a period is zero

A

alternating current

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28
Q

a synchronous alternating-current machine that changes mechanical power into electrical power

A

alternator (synchronous generator

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29
Q

an instrument for measuring electric current

A

anmeter

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30
Q

the current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating

A

ampacity

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31
Q

a charge of flow of one coulomb per seconf

A

ampere

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32
Q

current-consuming equipment, fixed or portable, such as heating or motor0operated euqipment

A

appliance

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33
Q

a branch circuit that supplies energy top one or more outlets to which appliances are to be connected, and that has no permanently connected lighting fixtures that are not a art of an appliance

A

appliance branch circuit

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34
Q

a cable provide with a wrapping of metal, usually steel wires, primarily for the purpose of mechanical protection

A

armored cable

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35
Q

a synthetic non=flammable insulating liquid which, when decomposed by electric arc, evolves only non-flammable gaseous fixture, usually used in transformers as insulator

A

askarel

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36
Q

a device used to transfer load from one power source to another e.g. transfer switch, switchboard assembly, etc.

A

automatic transfer equipment

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37
Q

a transformer in which part of the winding is common to both the primary and secondary circuits; output voltage adjusts automatically depending on required voltage of utilisation equipment

A

autotransformenr

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38
Q

a device or equipment which aids the main device or equipment

A

auxiliary

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39
Q

a sheet metal enclosure for conductors, cables, and bus bars at switchboards, meter centers, distribution centers and similar points

A

auxiliary gutter

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40
Q

a device used with fluorescent and high-intensity discharge lamps to provide the necessary circuit condition for starting and operating the lamp

A

ballast

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41
Q

the circuit conductors between the final over current device protecting the circuit and the outlets

A

branch circuit

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42
Q

a conductor that branches off at an angle from a continuous run of conductor

A

branch conductor

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43
Q

a synthetic rubber insulation used on wires, cables and other electrical apparatus

A

buna

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44
Q

a conductor or group of conductors that serves as a common connection for three or more circuits in a switchgear assembly

A

bus

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45
Q

a metallic bar used to provide common contact or termination for a group of all wires or cables such as in an auxiliary gutter, panelboard or a switchboard assembly

A

busbar

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46
Q

the protective covering such as non-metallic materials as plastic, applied over a cable

A

cable sheath

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47
Q

a device designed to open and close a circuit by non-automatic means and to open the circuit automatically on a predetermined over-current without damage to itself when properly applied within its rating

A

circuit breaker

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48
Q

in a wiring diagram, an arrow having circuit number designating the point at which such branch circuit will be connected

A

circuit homerun

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49
Q

a unit for measuring the cross-sectional area of a conductor (used in MCM conductors); wires and cables are presently measured by its diameter (mm) or cross-sectional area (sq. mm.)

A

circular mil

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50
Q

a measure of permissiveness to charge flow; the reciprocal of reisstance

A

conductance

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51
Q

a substance that has free electrons or other charge carriers which permit charge flow when an emf (electromotive force) is applied across the substance

A

conductor

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52
Q

a conductor having no covering or electrical insulation whatsoever

A

bare conductor

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53
Q

a conductor encased within material of composition or thickness that is not recognised by code as electrical insulation

A

covered conductor

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54
Q

a conductor encased within material of composition and thickness that is recognized by code

A

insulated conductor

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55
Q

a measure of the ability of a material or substance to conduct electric current, equal to the reciprocal of the resistivity of the substance

A

conductivity

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56
Q

a structure containing one or more ducts; commonly formed from iron pipe or other tubing

A

conduit

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57
Q

accessories used to complete a conduit system, such as boxes, bushings and access fitting

A

conduit fittings

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58
Q

an outlet which receives the plug with flexible cord of electrical appliances or equipment such as lamps, refrigerator, television set, power tools, etc.

A

convenience outlet

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59
Q

conductors drawn from a copper-clad aluminum rod with the copper metallurgical bonded to an aluminum core. the copper forms ten 910) percent of the cross-sectional area of a solid conductor or each strand of a stranded conductor

A

copper-clad aluminum conductor

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60
Q

an electric charge of 6.28 x 10^18 electrons and is transferred when a current of 1 ampere continues past a point for 1 second

A

coulomb

61
Q

the rate of charge flow

A

current

62
Q

an enclosure designed for surface mounting that has swinging doors secured directly to and telescoping with walls of the box proper

A

cutout box

63
Q

the ratio of the maximum demand of a system, or part of a system, to the total connected load of a system or part of the system under consideration

A

demand factor

64
Q

a unit of an electrical system that is intended to carry but not utilize electric energy

A

device

65
Q

an unidirectional current with a constant value

A

direct current

66
Q

a device, or group of devices, or other means by which the conductors of a circuit can be disconnected from their source of supply

A

disconnecting means

67
Q

a point at which energy is divided among feeders or branch or combination of both, and where overcurrent devices are usually located

A

distribution center

68
Q

a conducting path through which electric charges may flow. a dc circuit is a closed path for a charge flow; an ac circuit is not necessary closed and may conduct in part by means of an electric field

A

electric circuit

69
Q

a device for converting electrical energy into mechanical energy

A

electric motor

70
Q

the entire system of conductors, equipment and devices that are interconnected to sources of potential difference for distribution and or utilization of electrical energy

A

electrical system

71
Q

in practical system, electrical units comprise the volt, ampere, ohm, watt, watt-hour, coulomb, henry, farad, joule, etc.

A

electrical units

72
Q

a transient wave of current, potential or power in the electric circuit

A

electrical surge

73
Q

a physical entity associated with the atomic structure of matter that occurs in polar forms (positive and negative) and that are separable by expenditure of energy

A

electricity

74
Q

a process of emf (electromotive force) generation induced by movement of magnetic flux which cuts an electrical conductor

A

electromagnetic induction

75
Q

an energy-charge relation that results in electric pressure, which produces or tends to produce charge flow

A

electromotive force (EMF)

76
Q

a branch of electrical science dealing with the laws of electricity at rest

A

electrostatics

77
Q

a temporary source of light provided by a lamp powered by storage battery within the unit

A

emergency light

78
Q

a unit of capacitance defined by the production of one volt across the capacitor terminals when a charge of one coulomb is sotred

A

farad

79
Q

all circuit conductors between the service equipment, the source of a separately derived system, or other power supply source and the final branch-circuit over-current device

A

feeder

80
Q

a disruptive electrical discharge around or over (but not through) an insulator

A

flashover

81
Q

non-rigid conduit which conductors may be drawn

A

flexible conduit

82
Q

the number of periods occurring in unit time of a periodic periodic process such as in the flow of electric charge

A

frequency

83
Q

a protective device with a fusible element that opens the circuit by melting when subjected to excessive currentq

A

fuse

84
Q

an instrument for indicating or measuring comparatively circuit by melting when subjected to excessive current

A

galvanometer

85
Q

a branch circuit that supplies a number of outlets for lighting and appliances

A

general purpose branch circuit

86
Q

a machine that converts mechanical energy into electrical energy utilitizing electromagnetic induction principle

A

generato

87
Q

also know as alternator. a generator that produces alternating current

A

ac generator

88
Q

a conducting connection, whether intentional or accidental, between an electric circuit or equipment and the earth, or to some conducting body that serves in place of the earth

A

ground

89
Q

a circuit in which one conductor or point (usually the neutral conductor or neutral point of transformer or generator winding) is intentionally grounded, either solidly or through a grounding service

A

grounded circuit

90
Q

a system or circuit conductor that is intentionally grounded

A

grounded conductor

91
Q

a device installed in circuits where current leakage can be especially dangerous, such as outdoor or bathroom circuits; shuts off current flow within 0.025 second at the onset of leak as small as 5 milli-amperes

A

ground-fault circuit interrupter (GFCI)

92
Q

a conductor used to connect equipment or the grounded circuit of a wiring system to a grounding electrode or electrodes

A

grounding conductor

93
Q

the conductor used to connect the grounding electrode to the equipment grounding conductor, to the grounded conductor, or to both, of the circuit at the service equipment or at the source of a separately derived system

A

grounding electrode conductor

94
Q

a unit of inductance; it permits current increase at the rate of 1 ampere per second when 1 volt is applied across the inductor terminals

A

henry

95
Q

the magnetic property of a substance which results from residual magnetism

A

hysteresis

96
Q

opposition to AC current by a combination of resistance and reactance; impedance is measured in ohms

A

impedance

97
Q

a branch circuit that supplies only one utilization equipment

A

individual branch circuit

98
Q

separated from their conducting surfaces by dielectric permanently offering high resistance to the passage of current and to disruptive discharge

A

insulated

99
Q

a material or substance that does not allow the flow of electricity through it

A

insulator

100
Q

the highest current rating at rated voltage that a device is intended to interrupt under standard test conditions

A

interrupting rating

101
Q

a device used to convert direct current to alternating current

A

inverter

102
Q

a switch intended for isolating an electrical circuit from the source of power

A

isolating switch

103
Q

a short length of conductor used to make a connection between terminals or around a break in a circuit, r around an instrument. it is usually a temporary connection

A

jumper

104
Q

a box with a blank cover which serves the purpose of joining different runs of raceway or cable, and provided with sufficient space for connection and branching of the enclosed conductors

A

junction box

105
Q

a unit of energy, equal to the energy transferred or expended by one kilowatt in one hour

A

kilowatt-hour

106
Q

an instrument or device used to measure power consumption measured in kilowatt-hours

A

kilowatt-hour meter

107
Q

a switch in which the circuit is closed by moving a blade engaging contact clips; such type is used in safety switch design

A

knife switch

108
Q

an outlet used for direct connection of a lampholder, lighting fixture, or a cord that supplies a lampholder

A

lighting outlet

109
Q

device for providing path by which lightning disturbances or other static discharges are passed to earth; this is primarily intended to prevent damage to electrical apparatus due to lightning

A

lightning arrestor

110
Q

device for providing path by which lightning disturbances or other static discharges are passed to earth; this is primarily intended to prevent damage to electrical apparatus due to lightning

A

lightning arrestor

111
Q

partially protected locations under canopies, marquees, roofed open porches, and like locations, and interior locations subject to moderate degrees of moisture, such as some basements, some barns, and some cold storage warehouse.

A

damp location

112
Q

a location not normally subject to dampness or wetness. a location classified as dry may be temporarily subject to dampness of wetness, as in the case of a building under construction

A

dry location

113
Q

installations underground or in concrete slabs or masonry in direct contact with earth, and locations subject to saturation with water or other liquids, such as vehicle washing areas, and locations exposed to weather and unprotected

A

wet location

114
Q

is the largest of all the demands which have occurred during the specified period of time

A

maximum demand

115
Q

a component so constructed that the conducting parts are entirely enclosed in metal casing or enclosure

A

metal-clad

116
Q

a point or a place where all meters in a building may be located; usually located in the service area of a building for convenience and easy access

A

meter center

117
Q

a device, equipment or conductor so constructed or treated that exposure to a moist atmosphere will not readily cause injury or harmful effect in its quality

A

moisture-resisant

118
Q

the unit of conductance defined as the reciprocal of the ohm

A

mho

119
Q

the unit of resistance

A

ohm

120
Q

an instrument for measuring resistance values

A

ohmmeter

121
Q

a law stating that current is directly proportional to the applied voltage and inversely proportional to resistance, reactance or impedance

A

ohm’s law

122
Q

a point in a wiring system from which current is taken for supply of fixtures, lamps, heaters, etc

A

outlet

123
Q

any current in excess of the rated current of the equipment or the ampacity of the conductor; it may result form overload, short circuit or ground fault

A

overcurrent

124
Q

operation of equipment in excess of normal, full load rating or of a conductor in excess of rated ampacity that, when it persists for a sufficient length of time, would cause damage or dangerous overheating

A

overload

125
Q

a single or group of panel units designed for assembly in the form of a single panel; including buses, automatic overcurrent devices and equipped with or without switches for the control of light, heat, or power circuits; designed to be places in a cabinet or cutout box placed in or against a wall or partition and accessible only from the front

A

panelboard

126
Q

a device inserted into a receptacle for connection of a cord to the conductor terminations in the receptacle

A

plug

127
Q

is produced when 1 unit of work is done in separating unit charges through unit distance

A

potential difference

128
Q

the rate of doing work, or rate of converting energy when 1 volt is applied to a load and the current demand is 1 ampere, the rate of energy conversion is 1 watt

A

power

129
Q

an enclosed assembly that may include receptacles, circuit breakers, fuseholders, fused switches, buses and watt-hour meter mounting means

A

power outlet

130
Q

a device for making, breaking, or rearranging the connections of an electrical circuit

A

swicth

131
Q

in switch installation, a place or a point in a building where group of switches used to control group of lamps may be located

A

switch bank

132
Q

a large single panel frame or assembly of panels on which are mounted, on the face or back or both , switches, over-current and other protective devices, buses, usually instrument

A

switchboard

133
Q

a general term which covers switching and interrupting devices or apparatus

A

switchgear

134
Q

a device used for transferring one or more load- conductor connections from one power source to another such as an automatic transfer switch or manual transfer switch

A

transfer switch

135
Q

a static alternating current device used to change voltage by increasing or reducing it; it consists of windings, with or without taps, with or without magnetic core, used for introducing mutual coupling by induction between circuits

A

transformer

136
Q

a type of transformer used for increasing voltage

A

step-up transformer

137
Q

a type of transformer used for decreasing voltage

A

step-down transformer

138
Q

a fire-rated room containing a transformer and auxiliary equipment for a large building, usually located on grade or below ground and ventilated directly to the outside air

A

transformer vault

139
Q

the drop in voltage due to transmission of electricity in wires which is attributed to several factors such as resistance and length of conductor and temparature

A

transmission loss

140
Q

a term denoting interruption or disconnection of contact in devices such as circuit breaker, ground fault circuit interrupter and other similar devices

A

tripping

141
Q

a cable designed, constructed and specified for use below grade application

A

underground cable

142
Q

an emergency system designed to provide power automatically and instantaneously upon failure of the normal power supply

A

uninterruptible power supply

143
Q

equipment which utilises electric energy for mechanical, chemical, heating, lighting or similar purposes

A

utilisation equipment

144
Q

a metallic or non-metallic box intended for receptacle outlet or switch plate installation

A

utility box

145
Q

the unit of emf; it produces a current of 1 ampere in a resistance of 1 ohm

A

volt

146
Q

the drop in electric pressure in a circuit due to resistance of the conductor

A

voltage drop

147
Q

constructed so that moisture will not enter the enclosure under specified test conditions

A

watertight

148
Q

the unit of electrical power, equal to the product of 1 volt and 1 ampere in dc values, or in rms ac values

A

watt

149
Q

constructed or protected so that exposure to the weather will not interfere with successful operation

A

weatherproof

BU 2 (1 decks)

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