table_all_copyword- meaning(N)- connection() - (N)- connection- endpoint() - - (N)- connection- endpoint- identifier() - - (N)- data- source ()(N)- layer() - ( )(N)- protocol() - ( )(N)- protocol- control- information () - - - (N)- protocol- data- unit () - - - (N)- protocol- identifier () - - (N)- relay () (N)- service () (N)- service- access- point () - - (N)- service- data- unit () - - (N)- subsystem -(N)(N)- user data() - (N+1)- layer(+1) - (N-1)- layer(-1) - 15-supergroup assembly / 15-supergroup hypergroup 15 15-supergroup assembly modulating equipment / hypergroup modulating equipment - 15 15-supergroup assembly translating equipment / hypergroup translating equipment 15 - A pole; A frameA a.c. converter a.c. line a.c. machine a.c. voltage converter a.c./ d.c.converter / a.c.electrolytic capacitor abandoned call attempt abandoned traffic Abney phenomenon Abneys law Abnormal cathode fall absence of offsetzero offset absolute chronologytime tagging absolute chronology; time tagging Absolute error absolute error Absolute thermal detector ; Self-calibrating thermal detector ()absorbed voltage AbsorptanceabsorptionAbsorptionAC conversion factor AC filter accelerated accelerated ageing Accelerated test accelerated underreach protection (AUP) (abbreviation) accelerating torque accelerationaccelerator,promoteuracceptance angle acceptance test Accessible part Accessory (for a measuring instrument) ( )Accessory of limited interchangeability Accidental voltage transfer AccommodationAccumulated down time Accumulated time Accuracy (of a measuring instrument) ( )Accuracy class Accuracy class accuracy class index accuracy limit factor (of a protective current transformer) ( )Achromatic (perceived) colour ( ) Achromatic stimulus acid number,neutralization value acid treatment acknowledgementa-contact / Make contact a-contact ; make contact Acoustic enclosure acousto-optic effect acquisition time Actinic ( )Actinic dose ()Actinism ()actionaction flow action line action path action spectrum (actinic) ()activation (of primary battery) ( )activation polarization Active corrective maintenance time Active energy active fault Active laser medium - Laser medium Active maintenance time active material (electrochemically) ()active material mix Active network Active preventive maintenance time Active redundancy active surface of an electrode / working surface of an electrode / actual transformation ratio of a current transformer actual transformation ratio of a voltage transformer actual value actual value of a specified time Actuating means Actuating member actuator (in process control) ( )acyclic machine AdaptationAdaptive (perceived) colour shift Adaptive colorimetric shift adaptive control Adaptive control adaptive differential pulse code modulation / ADPCM (abbreviation) / adaptive prediction (in ADPCM) adaptive quantizing Adaptor (for accessories) - ()additive Additive mixture of colour stimuli addressAddress ( information ) / Address ( in telecommunication) ( )adhesiveadhesive tape adjustable constant speed motor ()adjustable insulated fork Adjustable luminaire() adjustable pliers adjustable speed motor ()adjustable tension pole (adjustable strain stick) adjustable varying speed motor ()adjustable wrench, open end adjusting command adjusting command Adjustment device / adjuster Administrative delay ( for corrective maintenance) aeolian vibration aerial (insulated) cable aerial lift device with insulating arm (bucket truck with insulating boom) Aerodrome beacon Aeronautical ground light Afterglow ageingageingAgeing failure Wearout failure Ageing fault Wearout fault air - gap air insulated terminal box air -to-air cooled machine air trunking aircraft warning marker (for conductor and earth wire) ( )air-metal (primary) battery / air depolarised battery (deprecated) air-to-water cooled machine Air-turbo lamp ; Compressed air luminaire alarmalgorithmaliasing aliasing / foldover distortion / alkaline air-zinc (primary) battery alkaline manganese dioxide-zinc (primary) battery / alkaline manganese battery (deprecated) - () alkaline primary battery ()alkaline secondary battery () all aluminium alloy conductor (AAAC) all aluminium conductor (AAC) all-angle cog spanner pole (all angle cog wrench) all-angle pliers Allards law all-glass fibre All-in tariff all-or-nothing relay alloy reinforced aluminium conductor (ACAR) all-plastic fibre all-silica fibre alternate mark inversion code / AMI (abbreviation) / bipolar code ()alternate mark inversion signal / AMI signal / bipolar signal alternate mark inversion violation / AMI violation / alternating current generator Alternating current system a.c.system ()Alternating light alternative control alternative route / alternate route Alternative test method ( for optical fibres ) - ATM ( abbreviation ) - Practical test method ( ) aluminium clad steel reinforced- aluminium conductor (ACSR/AC) Alychne ambient air temperature Ambient temperature ambient temperature (of a cell or battery) ( )Ammeter ammeter holder ()ampere - turns- Ampere-hour meter - amplifierAmplitude modulated signal generator Amplitude modulation Amplitude modulation distortion Amplitude modulation factor Amplitude of fluctuation of the luminous flux () analog signal analog-digital converter - Analogue (measuring) instrument () analogue repeater analogue signal analogue signal analogue transmission Analogue-to-digital conversion analogue-to-digital conversion / A/D conversion (abbreviation) anchoranchor clamp bracket / anchor clamp; tension clamp; dead-end clamp / / anchor rod Angle of deviation between two e.m.f.'s angle of incidence angle of overlap angle of shade (shielding angle) angle support angular displacement in synchronous generator Angular misalignment loss aniline point anisechronous / asynchronous (strongly deprecated in this sens) anisotropic (for electromagnetic waves) ( )annealed glass Annual[quarterly][monthly][weekly][daily] maximum demand ()()() ()anode / negative electrode / Anodic brush anodic polarization anodic reaction / (electrochemical) oxidation / answer bid ratio ABR (abbreviation) answer seizure ratio (asr) answering delay anti-climbing guard; anti-climbing device anti-clockwise rotationcounter clockwise rotation Anti-collision light anti-interference braid applicator antioxidant, oxidation inhibitor - antioxidant,oxidation inhibitor antipollution-type insulator anti-pumping device Antireflection coating antistatic (agent) Anti-Stokes luminescence Antivibration jumper installation tool antivibration jumper installing tool aperiodic time constant Aperture colour Apparatus mounting device Apparatus of category ia "ia"Apparatus of category ib "ib"apparent internal resistance Apparent magnitude [m] appearance (of an insulating liquid) ( )Appliance coupler Appliance inlet Appliance outlet application association application entity (AE) application functions application functions(in the sense of the basic reference model) application- process - application profile application service element applied voltage Approach lighting system Arc discharge ; electric arc Arc lamp arc resistance Arc tube arc-chute arc-control device ( )Arch dam architecture of a telecommunication network arcing contact (of a mechanical switching device) ( )arcing distance arcing horn arcing ring arcing time () arcing time of a multipole switching device arcing time of a pole arc-suppression coil () Arial lift device with insulating arm arm ( valve ) Arms reach Arms reach armature armature circuit armature reaction armature winding armourarmour rods ()aromatic carbon content aromatic hydrocarbon content artificial intelligence Artificial pollution test Artificially induced actinic effect askarel ()assemblies used on structures or supports to handle various pieces or equipment Associated electrical apparatus Associated phase layout association control service element Astatic measuring instrument Astronomical sunshine duration Asymmetrical input (output) Asymmetrical input (output) asymmetrical phase control Asymptotic availability Asymptotic mean availability Asymptotic mean unavailability Asymptotic unavailability asynchronous impedance ( ) Asynchronous link asynchronous machine asynchronous operation Asynchronous operation of a synchronous machine asynchronous reactance asynchronous resistance asynchronous telecontrol transmission asynchronous transmission Atmospheric transmissivity [T] [T]Attended substation attenuationAttenuationattenuation coefficient attenuation constant (term deprecated (symb:a Attenuation-limited operation Attenuatoraudible indications audioconference augered pile; bored pile Authorized maximum demand auto - sequential commutation auto - transductor auto self - excitation , self - saturation auto self - excitation valve auto self - excited transductor auto-compound current transformer auto-ignition temperature automate automaticautomatic come-along clamp (wire grip) automatic control Automatic disconnection of supply automatic generation control (AGC) automatic load restoration equipment Automatic maintenance ()automatic monitor function, self-monitoring function (USA) Automatic multiple shot reclosing automatic operation Automatic reclosing automatic reclosing equipment, automatic reclosing relay (USA) automatic restoration equipment automatic supervision function, self-checking function (USA) automatic switching equipment, automatic control equipment (USA) automatic switching off automatic switching on automatic test function, self-testing function (USA) automatically regulated autoreclose interruption time autoreclose open time auto-reclosing (of a mechanical switching device) auto-transformer auto-transformer starting auxiliary arm Auxiliary arm assembly auxiliary circuit auxiliary circuit (of a mechanical switching device) ( )Auxiliary contact auxiliary contact (of a mechanical switching device) auxiliary energizing quantity Auxiliary generator auxiliary information Auxiliary source auxiliary starting winding Auxiliary switchboard auxiliary switching unit Auxiliary transformer Auxiliary transformer of a unit (of a power station) ( )Auxiliary transformer of a unit (of a power station) auxiliary winding availabilityAvailabilityAvailability ( performance ) ()availability (Steady-state) Availability factor Available capacity of a unit (of a power station) ( )Available capacity of a unit (of a power station) ( )Avalanche photodiode Avalanche photodiode - APD (abbreviation ) average cladding diameter average core diameter average daily peak hour traffic intensity Average life Average price per kwh average reference surface diameter average transfer time average transfer time (in telecontrol) Avoidable costs axial core duct () Axial dimension axial propagation coefficient Axial ray Axial stagger Back face (back) Back flashover back span backfillbacking (material),base (material)/ ()Back-pressure set backscattering backup protection Bactericidal lamp;germicidal lamp Bactericidal radiation bafflebagbalance test balanced circuit; balanced line; balanced signal pair balanced code balanced metallic circuit Balanced state of a polyphase network balanced transmission Balancing bus Balancing of a distribution network ball and socket coupling ball bearing ball socket adjuster Ballast Ballast lumen factor Ballistic galvanometer Band overlap Bandingbanding insulation bandwidth (frequency) bandwidth (of an optical fibre) ( )Bandwidth-limited operation bank (capacitor) bar primary bushing type current transformer bar primary type current transformer Bare hand method Barrette Barrierbarrierbarrier device barrier layer barrier sheath; barrier jacket barring gearturning gear Base (of an accessory) Base load set base material (for printed circuits) ( )base standard baseband baseband transfer functionbaseband response function () basic 15-supergroup assembly / basic (15-supergroup) hypergroup 15 basic application function (in telecontrol) ( basic converter connection basic functions basic group ()()Basic insulation Basic insulation basic mastergroup Basic protection () basic reference model basic supergroup battery (primary) ( )battery base battery capacity battery crate battery for specific application (secondary) () battery polarization battery rack / battery stand / battery stillage battery tray baud (Bd) ( )Bay (of a substation) Bayonet cap ; bayonet base Bayonet pin b-contact / Break contact b-contact ; break contact , beaconbeam diameterbeamwidth beam divergence beam gantry; bridge; girderbeamsplitter bearing bearing bracket bearing clearance bearing hosing bearing liner bearing lining bearing pedestal bearing pressure bearing shell Beat (method of) measurement() bedding beginning of simultaneous sequence simultaneous sequence divergence beginning of sequence selection sequence selection divergence bell; undercut belt insulation belted cable Bevelled contact surface (bevelled contact face) ( )Bevelled corner Bevelled top Bezold-Brucke phenomenon bias winding bias-cut fabric Biased switch bid bidirectional bidirectional bidirectional bilateral control Billing error probability Bimetallic instrument Bin-and-feeder system boiler () binary (digital) signal ( ) binary delay element binary digit rate / bit rate Binary hue binary signal binary state information binary state information binary-logic element - binding band binding wire (tie wire) ()binding wire cutter blade (tie wire cutter) binding-wire cutter pole (tie wire cutter) Biological rhythm ()Bioluminescence ()Bipolar d.c.link bipolar line birefringence birefringent medium bistable element bistable relay bit erasure probability bit erasure rate bit error bit error probability bit error probability (in telecontrol) ( )bit error rate bit error rate (in telecontrol) ( )bit error ratio / BER (alation) / bit error (deprecated) bit oriented code bit oriented data transmission bit rate bit sequence independence black band black band test Black light lamp;Woods glass lamp ( )Blended lamp ; self-ballasted mercury lamp bloc foundation bloc mica - blockblockblock code block error probability block error probability (in telecontrol) ( )block error rate block error rate (in telecontrol) ( )Block tariff blockedblocked call attempt blocked spontaneous data transfer blocked traffic blockingblocking congestionblocking overreach protection (SOP) (abbreviation), blocking directional comparison protection (USA) blocking protection blow-out coil board, paper board body (of a suspension clamp) ()body extension Boiler bollard (traffic) Bolometer bolted-type separable connector bonding lead Boolean operation boost and buck connection boost charge boost converterstep - up converter boosterbooster transformer, series transformer (usa) ( )bose chaudhuri Hocquenghem- code both-way / two-way ( )both-way ; two-way both-way circuit / two-way circuit both-waytwo-way - bounce time bouncing (for a contact circuit) bound mode Bowl box (ring) wrench, single end, deep offset or not box frame bracing system; lacing system bracket braidBrake light; stop light brake test braking torque ()Braking torque (of an integrating instrument) branchBranch line / Spur branching point branch-joint break contact (for a monostable relay) ( )break loose torque(of the load) ()breakawayBreakdown breakdown (electric) breakdown (of an electronic valve device or of a valve arm ) ( )breakdown voltage break-in state (of an echo suppressor) ( )breaking capability Breaking capacity breaking capacity ( of a switching device) ()breaking current ()breaking length breakthrough break-time Breather (of an electrical apparatus for explosive atmospheres) breeches; Y joint ybreeches-joint; Y jointY ,Brewster's angle ""bridgebridge connection bridging time Bright - brightness (deprecated) (symb : L)Brightness; luminosity broadcast command broadcast command broadcastingbroadcasting (service) brouterBrushbrushbrush - holder fixing device brush box Brush contact drop brush flexible brush holder Brush potential curve brush pressure device brush-holder rocker brush-holder supporting structure brushless brushless wound-rotor induction motor buck converterstep - down converter buffer battery Building void built-up mica ()Bulb bulb-type unit Bulk power system Bulkhead luminaire () bunched conductor bunched frame alignment signal bundle assembled aerial cable Buoy Burden ( )Burn in ( for a non-repairable item ) Burn in (for repairable hardware ) burningburst isochronous burst transmission Bus admittance matrix; Y bus matrix ()Bus coupler circuit-breaker Bus impedance matrix; Z bus matrix ()bus type current transformer Busbar ()Busbar fault Busbar section Busbar section disconnector Busbars (commonly called BUSBAR ) bushed outblocked bushing ()bushing ()bushing type current transformer ()busybusy hour Busy state butt contact button (primary) cell ()by - pass arm by-pass jumper byte ( )Cab ; base Cable brackets Cable channel cable coupler cable cutter Cable duct (in a substation ) ( )Cable ducting system Cable ladder Cable management Cable rack Cable reel Cable tray Cable trough (in a substation) ( )Cable trunking system Cable trunking system Cable tunnel Cable tunnel ( )cable type current transformer cabled distribution cage induction motor cage synchronous motor cage winding calculation of efficiency from summation of losses calculation of efficiency from total loss calibrated driving machine test Calibrating quantity CalibrationcallcallCall abandonment probability call attempt call attempt (by a user) call congestion call control procedure call establishment call intensity call intent call release call string callingcalorimetric test camber of an insulator can (of a primary battery) Candela (cd) ( )Candela per square meter (cd.m-2) canned machine cantenary cantenary constant Cantilever brush Cantilever top cap and pin insulator () Cap lamp Capabilitycapacitance graded bushing capacitance of a capacitor (property) ()capacitance of a capacitor (quantity) ()capacitance tolerance (of a capacitor) capacitor bank protection capacitor braking capacitor commutation capacitor installation capacitor losses capacitor motor capacitor start and run motor capacitor start motor capacitor voltage divider capacitor voltage divider capacitor voltage transformer capacity (of a primary battery) ( )Capacity cost capacity density (of a primary battery) / volumic capacity (of a primary battery) ( ) / ( )Capital contribution to connection costs Capital contribution to network costs Carbon filament lamp Carbon- graphite- carbon monoflouride-lithium (primary) battery - ()carbon-type analysis carbon-zinc (primary) battery / zinc-carbon (primary) battery - () / - ()Cardiac fibrillation Cardinal light Cardinal mark carriercarrier frequencies (in multichannel carrier transmission) ( )Carrier frequency shift carrier transmission cartridge type bearing cascade (inductive) voltage transformer ()cascade control casting- casting resin,casting plastic( ) Cataleptic failure Catastrophic failure Catering [pumping] [public lighting] etc tariff () ( )cathode / positive electrode / Cathode fall ; cathode drop () Cathodic brush cathodic polarization Cathodic protection cathodic reaction / (electrochemical) reduction / Cathodoluminescence ceiling voltage cell (primary) ()cell / (rechargeable) cell (secondary) () / cell / (rechargeable) cell / storage battery (USA) (secondary) () / / cell or battery (electrochemical) ()cellular plastic, foamed plastic ()cellulosic paper cement (noun)cement (verb) centralized absolute chronology centralized absolute chronology Centralized telecontrol (of loads) Centre line ceramicceramic glass (material) chafe tape winder (armour tape winder) chainchain binder chain extension chain flow chain structure ChamferChamfered bars Chamfered top (bevelled edge) change of state announcement change- of- state announcement change over contact: two-way contact (deprecated) ( )change-over break-before-break contact non bridging contact (deprecated) ( )change-over contact with neutral position change-over make-before-break contact bridging contact (deprecated) ( )change-over selector change-over time (for a bistable relay) channelchannel (FDM telephone) channel (frequency) ()channel (PCM) (telephone) ( )channel (transmission) ()channel (transmission) ( )channel carrier frequencies channel gate channel selecting telecontrol systemcommon diagram telecontrol system channel selecting telecontrol system; common diagram telecontrol system channel time-slot channel translating equipment / channel bank (USA) Character (of a light signal) characteristic (curve) (of a converter) ( ) characteristic curve characteristic equation characteristic of a switching device ( I2t) (I2t) characteristic quantity (of a measuring relay) charge (of a battery) / charging (of a battery) ( )/ ()charge acceptance charge efficiency (of a cell or battery) ( )charge factor charge rate charge retention / capacity retention (USA) Chargeable demand charged drained (secondary) battery / conserved charge (secondary) battery () / () charging current of capacitor charging of a capacitor Chart driving mechanism check command check command check sequence; check sum check time check zone checkback signal Check-out time chemical vapour deposition technique / CVD (abbreviation) Chemiluminescence chimney of a foundation ; pier of a foundation chirping Chopped lightning impulse Chroma Chromatic (perceived) colour () Chromatic adaptation Chromatic stimulus ChromaticityChromaticity coordinates Chromaticity diagram Chromaticness;colourfulness chromium oxide-lithium (primary) battery ()chronological transmission of change- of- state information CIE 1931 standard colorimetric observer 1931CIE 1931 standard colorimetric system (X Y Z ) 1931CIE 1964 supplementary standard colorimetric observer 1964CIE 1964 supplementary standard colorimetric system ( X10 Y10 Z10 ) 1964CIE 1974 general colour rendering index [Ra] 1974CIE 1974 special colour rendering index [Ri] 1974CIE 1976 L*a*b colour difference 1976CIE 1976 L*a*b colour space 1976CIE 1976 L*u*v colour difference 1976CIE 1976 L*u*v colour space 1976CIE 1976 uniform-chromaticity-scale diagram 1976CIE colour-matching functions 1931CIE standard clear sky CIE standard illuminants CIE standard overcast sky CIE standard photometric observer CIECIE standard sources () ciphertext circle diagram circuit (electric) Circuit (in electric power system) circuit (of an installation (Electrical) () ()circuit (of an overhead line) circuit (telecommunication) ( )circuit (telecommunication) circuit (telecommunication) circuit angle circuit crest working off - state voltage circuit crest working reverse voltage circuit group / trunk group Circuit insulation voltage circuit local backup protection circuit non - repetitive peak off - state voltage circuit non - repetitive peak reverse voltage circuit off - state interval circuit repetitive peak off- state voltage circuit repetitive peak reverse voltage circuit reverse blocking interval circuit subgroup circuit switched data network (CSDN); circuit switched network circuit switched network circuit switched public data network (CSPDN) circuit switching circuit switching circuit switching unit circuit-breaker (mechanical) ()Circuit-breaker /RCD (abbreviation) circuit-breaker capacitor circuit-breaker failure protection, breaker failure protection (USA) circulating current Circumferential stagger cladding / cladding centre cladding diameter cladding diameter tolerance Cladding mode Cladding mode stripper - Mode stripper Cladding tolerance field clamp - Clamping unit ()Class index class of an exchange Clean situation Clear bulb clearance ( )clearance between open contacts (gap) clearance between poles Clearance distance clearance to earth (of a pole) ()clearance to obstacles cleat (in pad and chimney foundation) Cleats Clampsclevis and tongue coupling clevis eye attachment clevis screw adapter clevis/tenon pole (clevis/tongue stick) clevis-tenon adaptor - clevis-tenon extension (clevis-tongue extension) - clip-on ammeter pole (amertong clockclockwise rotation clockwise rotation closed action flow closed action path closed circuit (of a cooling system) closed loop controlfeedback control Closed loop stabilization closed machine closed position (of a mechanical switching device) ( )closed transition auto transformer startingclosed circuit auto transformer starting (USA) closed user group closed-circuit voltage / on-load voltage / Closingclosing operation (of a mechanical switching device) ( )closing time closing time of a break contact (output break circuit) (for a monostable relay) ( )closing time of a make contact (output break circuit) (for a monostable relay) ( )cloud point coarse synchronizing Coated bulb coating powder coaxial pair codecodeCode converter code division code division multiplexing CDM (abbreviation) code- independent data communication code- transparent data communication ()code transparent data transmission;bit oriented data transmission ()code word (in pulse code modulation) ( )Coefficient of luminous intensity Coefficient of retroreflected luminance Coefficient of retroreflection Coffer () coherencecoherence length coherence time coherentcoherent area coherent radiation Coherent radiation coilcoil or bar insulation coil section coil side coil side separator coil spancoil pitch Coiled-coil filament Coincidence factor Cold cathode lamp cold curing Cold reserve Cold start-up of a thermal generating set Cold-start lamp ; instant-start lamp collectively shielded cable collimationColor, psychophysical color (perceived)Colorimeter Colorimetric purity ( )Colorimetry Colourcolour (of an insulating liquid) ( )Colour atlas Colour equation Colour matching Colour rendering Colour rendering index [R] () Colour solid Colour space Colour stimulus Colour stimulus function Colour temperature [Tc] ( ) [Tc]Coloured bulb Colour-matching functions comb combination fault combinatorial circuit combined (insulating) material Combined heat and power combined station combined transformer commandcommandcommand ( in telecontrol) ( )command direction command variable Commercial tariff commissioning (of a battery) commissioning test common alarm common alarm Common auxiliaries Common battery common diagram telecontrol system Common equipotential bonding system / Common bonding network / (CBN) Common mode failure ( )Common mode rejection ratio (abbreviation:CMRR) common mode voltage Common mode voltage Common type reference (for accessories) ()common winding communicationcommunicationcommutating group commutating winding commutationcommutation capacitor commutation circuit commutation failure commutation inductance commutation interval commutation notch commutation number commutation reactor commutation test ()commutation voltage commutatorCommutator / brush potential () / commutator mica material () commutator pitch commutator riser () commutator segment commutator segment insulation ()commutator type frequency converter ()commutator V - ring () - Vcommutator V - ring insulation () - Vcompacted conductor companion standard comparative tracking index,CTI (abbreviation) Comparatorcomparing element Comparison (method of measurement)() Comparison lamp Comparison standard Comparison value compatibility (in plastic) compatibility (of insulating materials) ( )compensated regulated compensated repulsion motor compensating winding compensatorComplementary (method of) measurement() Complementary colour stimuli Complementary wavelength complete bridge connection Complete failure Complete fault Function-preventing fault completed call attempt completely immersed bushing completion ration complex permittivity Complex refractive index Compliance test composite characteristic Composite components Composite conduit Composite conduit fitting composite configuration composite error composite insulator compositely excited compound data field (CP) compound excited compounding characteristic compound-wound current transformer Compressed air power station Compressed air storage computer control concentrated winding concentration polarization/ mass-transfer polarization / concentrator station concentric conductor concentric neutral (conductor) ()concentric neutral cable concentric winding concentric winding concentrically stranded circular conductor concrete syntax condensation pressure condensation temperature CondenserCondensing set Condensing set with reheat Condensing steam turbine Condensing steam turbine with bleeding condition of a bistable relay conditional command Conditional residual short-circuit current Conditional short-circuit current (for a residual current device) ( )Conditional stability of a power system ()conditioningconducting direction conducting varnish conduction current conduction interval (of a valve arm) ( )conduction ratio conduction through Conductive clothing conductive clothing Conductive part conductive part Conductorconductor (of a cable) conductor (of an overhead line) conductor (wire) gauge conductor bundle conductor cleaning brush conductor configuration conductor cover (line hose) ( )conductor galloping conductor insulation conductor insulation conductor sander conductor screen ( ) Conductor support assembly conductor support pole (wire support stick) conductor vibration ConduitConduitConduit fitting Conduit joint Conduit system Cones Configuration factor configuringconfirm (primitive)conformance testing Conical head conical rotor motor Connected load Connecting device Connecting terminal plate () connection connectionconnection (complete) Connection charge Connection drop Connection line / Access line / Subscriber's line / Subscriber's loop / / / connection- mode (CO) connection- mode network service (CO- NS) connection- mode transport service (CO- TS) Connection retainability ( in telecommunication ) ()connection symbol connectionless- mode network service (CL- NS) - connectionless- mode (CL) - connectionless-mode transport service (CL- TS) - Connector ()connector (lamp) consequential fault conservation of radiance consistencyConspicuityconstant current charge constant current power supply Constant failure intensity period Constant of a measuring instrument constant speed motor Constant voltage /constant current crossover / constant voltage charge constant voltage or constant current power supply constant voltage power supply constant voltage to constant current crossover constrained current operation , forced excitation ConsumerConsumer; customerConsumer-related cost contact (of a mechanical switching device) ( )contact assembly () Contact bevel angle contact circuit contact follow contact force contact gap () contact member contact piece Contact plate ; eyelet ()contact roll Contact surface ( contact face) ( )contact tip (or point) contact wipe contactor (mechanical) containercontaminant- continuity criterion (Supply) continuity fault / Open Circuit fault (Conductor) () / continuity full current (Conductor) ()Continuity of supply continuous (feedback) control ( )continuous action continuous control system continuous cross-bonding continuous flow (of direct current) ( )Continuous line recorder continuous rated current ()continuous running dutyduty type S1 S1continuous service test ()continuous-operation periodic duty duty type S6 S6continuous-operation periodic duty with electric braking duty type S7 S7continuous-operation periodic duty with related load-speed changesduty type S8 - S8Contrast Contrast rendering factor Contrast sensitivity ]Sc] controlcontrolcontrol valve Control board[desk] Control board[desk] control centre control centre control chain control characteristic Control circuit control circuit (of a switching device) ( )control contact (of a mechanical switching device) control current control direction Control discrepancy switch control discrepancy switch; control discrepancy key control- field control hierarchy control level control lines control loop Control mechanism control range Control range ( )control switch control system control voltage control winding control winding controlgear controllabilityControllable load Controllable set controllable valve device Controlled circulation boiler () controlled conventional no \ load direct voltage controlled ideal no - load direct voltage Controlled maintenance controlled slip controlled station controlled system controlled variable controller ( )controlling (repeater) station ( ) Controlling power range controlling station controlling system control-motor actuatorservomotor actuator conventional error conventional fusing current conventional no - load direct voltage conventional non-fusing current Conventional non-tripping current (symbol Int) ( ) Conventional operating current (of a protective device) ( )Conventional thermal power station Conventional touch voltage limit Conventional touch voltage limit .Conventional tripping current (symbol It) () Conventional true value(of a quantity) conversation (in telecommunication) ( )conversion (electronic) (power) conversion (electronic) a.c.(power) ( )conversion (electronic) d.c (power) ( )conversion (electronic)a.c./d.c. (power) / Conversion adaptor (for accessories) () ()conversion factor(in general) ( )Conversion of electricity Conversion rate conversion time (Total) converterconverter connection converter section of a double converter Converter substation converter(electronic) ( power ) converter(electronic ) ( power) coolant coolingCooling tower Copper dragging copper oxide-lithium (primary) battery ()copper oxide-zinc (primary) battery / Lalande battery (deprecated) Copper picking Cord extension set ( )Cord operated switch Cord switch cordonCordset ( )corecorecore (of a reinforced conductor) ( )core area core centre core diameter core diameter tolerance core end plate core of an insulator core test Core tolerance field core/cladding concentricity error / core/reference surface concentricity error / core; insulated conductor () Cored brush ()corner frequency Cornice lighting coronacorona shielding correct operation of protection, correct operation of relay system (USA) Corrective maintenance Corrective maintenance time Correlated colour temperature [Tcp] [Tcp]corresponding terminals corrosive sulphur Corrugated conduit cor-type reactor (deprecated) ( )cor-type transformer (deprecated) ( )Cost allocation Cost classification Cost formula Cost of KWH not supplied cotton paper Coulometer counted measurand; metered measurand; metered reading countercounter pulse; meter pulse counterpoise ()counterpoise system (Electric) ()countingcoup de fouet coupled modes coupler loss coupling capacitor Coupling efficiency coupling loss Cove lighting ( )cranked coil crawlingcreepage (of electrolyte) ( )Creepage distance creepage distance creepage distance creeping ( of a c.c. motor ) ( )crepe paper ()crepingcritical angle critical build-up resistance critical build-up speed Critical failure Critical fault Critical resistance (of a permanent- magnet moving-coil measuring element ) ( )critical self - excitation Critical state critical temperature (of a cell or battery) ( )critical torsional speeds critical whirling speeds Cross bar (of lights) cross- talk cycle time crossarm ()cross-bonding Cross-compound set cross-country (USA) Crossingcrossover area Crossover of load characteristic crossover point crystallization polarization cumulative compounded Cumulative downward flux proportion Cumulative flux cuprous chloride-magnesium (primary) battery cure (verb)curing temperature curing time Current circuit (of a measuring instrument ) ( )current controlling transductor Current cut-out current delay angle Current delay angle (symbol ) ( )current error Current in the fault Current in the short circuit current linkage ( of a distributed winding )Ampere -Conductors ( of a distributed winding ) ( )current matching transformer current pulsation current ratiocurrent amplification current setting range (of an over current release) ( )current setting(of an over current release) ( )current stiff a.c./ d.c. converter / current transformer current-carrying capacity (of a conductor) Ampacity (USA) (Continuous) () ()current-limiting circuit-breaker Current-using equipment Cutback technique Cut-off Cut-off angle cut-off current ( of a switching device) ( )cut-off current characteristic (of a switching device on a.c) Cut-off load Cut-off wavelength ( of a mode ) ()Cut-off wavelength ( of a singlemode optical fibre ) ( )cutter key plier pole cut-through test cutting nipper cutting nipper cybernetics cycle (of a battery) ()cycle of operation cyclic control signal cyclic duration factor cyclic irregularity cyclic time (in telecontrol) cyclic time-scale cyclic timing signal cyclic transmission cyclic transmission Cyclic voltage variation Cycling trip- free circuit-breaker cycloconverter Cylinder (of a steam turbine) ( )cylindre (insulation) Cylindrical commutator Cylindrical head Cylindrical irradiance (Ee,z; Ez) () cylindrical post insulator cylindrical rotor machine d .c. resistivity (volume) d.c. converter d.c. injection brakingd.c. braking (USA) d.c. line d.c. resistance (volume) ()d.c. ripple factor d.c.machine DamDamage fault damping ratio Damping torque damping winding damping(of an oscillation) ()Dark - dark current Dark current (Io) datadata circuit data circuit terminating equipment (DCE); line coupler data communication ; data transmission data consistency data integrity data lifetime control data network data security data size data terminal equipment (DTE) data transfer phase data transfer rate data transfer time data transmission data transmission channel data transport functions; data transport services data type data unit data unit type datagram datagram service Data-sensitive fault day to busy hour ratio Daylight Daylight factor [D] [D]Daylight illuminant Daylight lamp Daylight locus Daylight opening DC conversion factor DC filter DC from factor DC power dead banddead zone Dead short dead time dead time ( )dead time (during auto-reclosing) dead time element deadbreak connector dead-end tension joint deblocking decentralized control decision circuit (for a digital signal) ( )decision feedback,transmission with decision feedback, decision instant (for a digital signal) ( )decision table decision value decode decoding (in pulse code modulation) decoupling decryption, decipherment Dedicated battery dedicated circuit Dedicated low-voltage wiring de-electrification Defective colour vision Deferrable load Deferred maintenance definite purpose motor definite time-delay over-current release Deflecting torque Driving torque Deflection coefficient deflection under bending load Degradation failure degree of coherence degree of polymerisation (of a polymer) ()degree of polymerisation (of cellulosic paper) ( )Degree of protection provided by enclosures (of electrical apparatus) () de-iteration delamination delay command Delay device delay mode of operation Delay time (of time-delay switch) ( )Delayed automatic reclosing delayed protection, time-delayed protection (USA) delineator Delivery point delta configuration delta connection ()delta modulation / AM (abbreviation) Delta-Wye conversion;delta-star transformation DemandDemand charge ; fixed charge Demand factor Demand integration period Demand rate ; price per kilowatt[kilovolt-ampre] Demand set up Demand tariff Demand-related cost democratic mutually synchronized network demultiplexer demultiplexing demultiplexing demultiplexing (in SOI sense)Densitometer Dependabilitydependability of protection, dependability of rely system (USA) dependent (repeater) station () dependent manual operation (of a mechanical switching device) dependent power operation (of a mechanical switching device) dependent-time measuring relay depolarisation current depressed cladding deri motor derivative action coefficient derivative action gain derivative action time derivative elementD- element derived channel descrambler (in digital transmission) ( )describing function Design current (of a circuit) ()Design failure Design fault Design review desired value destination (of a call attempt) ( )Detachable part Detecting instrument Detection (of a residual current) ( )Detection threshold - Sensitivity DetectivityDetectivity (of a detector) [D] Determinate fault Determination test Developing fault developing fault, evolving fault (USA) deviationDeviation of synchronous time dew point diagonal leg profile Dial ()Dialling mistake probability dialling time dial-tone delay diamond winding dichroic filter dichroic mirror dielectric dissipation factor Dielectric dry test dielectric loss angle dielectric test Dielectric wet test dielelectricdielelectric loss Difference galvanometer Differential galvanometer difference in levels differential compounded Differential (method of) measurement() differential gap Differential input Differential measuring instrument differential mode attenuation Differential mode delay - Multimode group delayequilibrium mode distribution differential mode voltage differential phase- shift keying (DPSK) differential pulse code modulation / DPCM (abbreviation) Differential quantum efficiency diffractionDiffraction diffraction grating Diffuse reflectance (d) Diffuse reflection Diffuse sky radiation Diffuse transmission Diffuse transmittance ( d) Diffused lighting DiffuserDiffuserDiffusion factor [] Diffusion; scattering digit filling ( )digit position digit rate (in digital transmission) ( )digit sequence integrity digit time-slot Digital (measuring) instrument () digital block digital data circuit digital demultiplexer digital distribution frame digital error digital line link / digital line path (deprecated) digital line section digital line system digital link / digital path (deprecated in this sense) / digital measured value digital muldex digital multiplex equipment digital multiplex hierarchy digital multiplexer digital multiplexing digital pulse duration modulation (DPDM ) digital pulse duration modulation (DPDM) digital radio link / digital radio path (deprecated) digital radio section digital radio system Digital readout digital section digital signal digital signal digital sum digital sum variation (of a line code) ( )digital test sequence DTS (abbreviation) Digital to-Analogue conversion ()digital transmission digital transmission system Digital voltmeter (ammeter)(ohmeter) Digital voltmeter (ammeter)(ohmeter) Digital voltmeter (ammeter)(ohmeter) digital-analog converter - digital-to-analogue conversion / D/A conversion (abbreviation) DimDimmer Dipped-beam headlight; Low-beam headlight , direct - axis transient short-circuit time constant direct ( power ) conversion Direct (indirect) actinic effect ( )Direct (indirect) actinic effect ( )direct (method of) measurement() direct a.c. converter direct a.c./ d.c. converter / Direct acting instrument Direct actuation direct- axis - component of magnetomotive force direct axis synchronous reactance direct calculation of efficiency direct commutation Direct contact Direct contact direct cooled windinginner cooling winding Direct current system d.c.system direct d.c. converterd.c. chopper direct digital control DDC Direct entry (into electrical apparatus) Direct flux (on a surface) ( )Direct glare direct input-output matrix direct inverter Direct lighting Direct lightning strike direct over-current release Direct ratio(of an interior lighting installation) direct rectifier Direct solar radiation direct through-connection filter / direct line filter / direct transfer filter direct through-connection point direct voltage regulation direct water-cooled machine direct-axis component of current direct-axis component of synchronous generated voltage direct-axis component of voltage direct-axis sub - transient direct-axis sub - transient voltage direct-axis sub -transient open-circuit time constant direct-axis sub -transient short - circuit time constant direct-axis transient open - circuit time constant direct-axis transient reactance direct-axis transient voltage Direction indicator light; Turn-signal light Direction light direction of action direction of lay ()direction of lay directional comparison protection directional coupler Directional emissivity Directional lighting directional protection ( )Directly-fired boiler () directly-powered (repeater) station direct-on-line startingacross-the-line starting director current measuring transductor Dirty situation Disability glare Disabled state Outage disabled state (of an echo suppressor) / ( )Disabled time disabling ( )disc and wiper lubricated bearing Disc recorder discharge (electrical) discharge (of a battery) / discharging (of a battery) ()discharge (of a primary battery) ( )Discharge current (of an arrester ) ( )discharge current / current (drain) / discharge device of capacitor discharge energy discharge inception test discharge internal Discharge lamp discharge rate discharged drained (secondary) battery () discharging current of a capacitor discharging of a capacitor Discomfort glare Disconnectable busbar Disconnectable remote control switch Disconnectable time-delay switch / disconnectable TDS disconnector (isolator) discrepancy switch Discrepancy switch discretely-timed signal discriminating zone discriminationdisc-type machine disengaging percentage disengaging ratio disengaging time (for a given function) ( )disengaging value of the characteristic quantity ()disparity dispatching centre dispersion Dispersion - Chromatic dispersion (redundant term) Disruptive discharge / flashover /sparkover distance - velocity lag -distance protection, distance relay (USA) () distortion (of a signal) ( )Distortion limited operation distributed ( computer ) control system ()distributed feedback control distributed frame alignment signal distributed parameter system distributed winding Distribution circuit (of buildings) ()distribution factor distribution framedistribution line Distribution losses Distribution of electricity distribution of luminous intensity (spatial) () ()Distribution temperature (TD) Distribution undertakingDistribution undertaking ; distributordisturbance estimation Disturbance recorder/perturbograph disturbance variable Diversity factor diverter switch dividing box; splitter box Domestic tariff Dominant wavelength DoseDose rate Dotted line recorder double - point information double - way connection (of converter ) ()Double busbar substation double circuit line double circuit semi-vertical configuration double circuit vertical configuration double command double command double converter double crucible technique double ended synchronization Double faults double -fed machine Double insulation Double isolation double phantom circuit double- point information double purpose voltage transformer ()Double shoe terminal () Double tension pole insulator tool double warren redundant support; double lacing redundant support double warren; double lacing double-circuit fault ()double-pole clamp (double-stick clamp) double-winding synchronous generator Dovetailed top (double angle shoulder) Down duration;outage duration Down state Internal disabled state down time Down time Downlight Downlight Downward flux (of a source) Downward flux fraction ( ) Downward light output ratio Drain / Draining device /draw lead bushing Drift ( )drive end of machineD-end driven pile driving mechanism Droop of a set Droop of a system dropper; switching bracketV Drum recorder dry (primary) battery () dry charged (secondary) battery () Dry cooling tower dry discharged (secondary) battery () dry-type reactor dry-type transformer Dual grade brush Dual grade sandwich (laminated) Dual grade split brush Dual grade triple split brush with separate top-piece duct spacer Ducting length dumb-bell shaftspacer shaft dummy coil duplex ; full duplex (deprecated) - duplex lap winding duplex transmission; duplex traffic duplex wave winding Duplicate supply duplicate test Durabilityduration ( Time ) ()Dust grooves dust seal dutyduty cycle duty type duty with non-periodic load and speed variationduty type S9 - S9dynamic braking dynamic conformance requirements dynamic input dynamic viscosity dynamometer dynamometer test earlang (symbol: E) Early failure period earth (-return) phantom circuit Earth (verb) / Ground (verb)(US)Earth / Ground (USA)Earth circuit connector Earth conductor /ground conductor (USA) earth dam Earth electrode Earth electrode / Ground electrode (US) Earth electrode / ground electrode (USA) Earth fault / Ground fault (US) Earth fault current Earth fault factor Earth fault factor / Ground fault factor (US) Earth leakage current Earth leakage detector Earth plate / ground plate (USA) Earth resistance meter earth return Earth rod / ground rod (USA) Earth strip / ground strip (USA) Earth switch / Grounding switch (US) earth terminal earth terminal Earth terminal / ground terminal (USA) earth terminalground terminal earth wire peak; overhead ground wire peak earth wire; shield wire; overhead ground wire Earthed input(output) Grounded input (ouput) Single-ended input(output) Earthed input(output) Grounded input(ouput)(USA) Single-ended input(output) earthed voltage transformer ; grounded voltage transformer (USA) Earth-electrode network /Ground-electrode network (Us) earth-fault protection, ground-fault protection (USA) Earthing arrangement / Grounding arrangement (US) Earthing conductor / Grounding conductor (US) Earthing conductor / Grounding electrode conductor (USA) () / Earthing for work / grounding for work (USA) Earthing for work / Grounding for work(US) Earthing network / grounding network (USA) Earthing switch earthing switch Earthing system/grounding system(USA) Earthing terminal / Grounding terminal (US) Earthing-conductor voltage (to earth) / Grounding-conductor voltage (to ground) (US) ( )earth-return circuit Earth-return path / Ground-return path (US) Earth-surface voltage (to earth) / Ground-surface voltage (to ground) (US) ( )echoecho cancellation echo canceller echo control echo function with weak infeed end echo principle echo suppression echo suppressor Economic loading schedule Economical load of a unit eddy current coupling () eddy-current braking Edge- emitting light emitting diode - ELED ( abbreviation ) edge insulator Effective demand Effective demand factor effective digit rate (of atime-slot) ( )Effective dose Effective intensity (of a flashing light) effective mode volume effective synchronous reactance effective traffic effective turns per phase effectively conducting output circuit (for relays without output contact) ( )effectively non conducting output circuit (for relays without output contact) ( )Effectiveness ( performance ) ()Effects projector efficiencyelastomer Elbow (of a conduit) Bend (of a conduit) ( )- ()electric braking Electric burn Electric burn Electric contact electric coupling () Electric discharge (in a gas) ( )Electric line electric loading of distributed winding electric loading of machine Electric mark electric power system messaging (EPSM) Electric resistivity of soil Electric screen Electric shock Electric shock Electric shock electric strength Electric supply systems for safety service electrical back-to-back test Electrical equipment Electrical installation (of a building) ()Electrical apparatus for explosive atmospheres / Explosion-protected electrical apparatus hazardous location equipment () electrical braking torque () electrical dynamometer Electrical enclosure () electrical insulation Electrical measuring instrument Electrical power system / Electrical power network Electrical power system / Electricity supply system (in a broad sense) electrical relay Electrical zero Electrical zero adjuster Electrically independent earth electrodes electric-rotating machine electrificationelectrification current Electrocution Electrocution electrodeelectrode (of a battery) ()electrode reaction Electrodynamic instrument Electrodynamic meter Electrographite electroluminescence Electroluminescence Electroluminescent lamp Electroluminescent panel Electroluminescent source electrolyte electrolyte electrolyte level indicator electrolyte retention electrolytic capacitor electrolytic capacitor paper Electromagnetic contactor electromagnetic radiation Electromagnetic screen electromagnetic unit (of a capacitor voltage transformer) ( )electromagneting braking electromechanical relay Electromechanically operated contact mechanism Electrometer electrongative gas electronic (power) switch electronic (power) switching electronic AC (power) switch electronic AC power controller Electronic control unit electronic DC (power ) switch electronic device Electronic extension unit Electronic measuring instrument Electronic momentary contact switch electronic power filteractive power filter electronic valve device Electro-ophthalmia electro-optic effect Electro-pneumatic contactor Electroscope Electrostatic instrument element (capacitor) elementary cable section elementary frequency Elementary maintenance activity elementary period elementary repeated section elementary repeater section elementary section em' eddingembedded coil sideslot portioncore portion Emergency stopping emergency battery Emergency lighting Emergency switching emergency tripping device Emission ()emission spectrum (luminescence) Emissive material Emissivityemissivity (hemispherical) ( )enabling (in echo control) ( )enabling signal enamel (1) enamel (2) - Enamelled bulb ( )encapsulated winding encapsulated-winding dry-type reactor encapsulated-winding dry-type transformer encapsulating- encapsulating resin ( ) enclosed fuse-link Enclosure ()EnclosureEnclosure (of electrical apparatus) encoding (in pulse code modulation)encryption; enciphermentend of simultaneous sequence convergence simultaneous sequence end fitting end of sequence selection sequence selection convergence end plate ( of rotor ) ( )end shield end system end winding end- winding cover end-cap end-of-charge rate / finishing rate / end-of-charge voltage (of a cell or battery) ( )end-point voltage / cut-off voltage / end-shift frame enduranceenduranceEndurance test energized condition Energizing input-quantity energizing quantity energizing winding -energy (Electrical ) Energy capability (of one or more hydroelectric installations) ( )Energy capability factor (of one or more hydroelectric installations) Energy capability of a reservoir Energy cost energy density (of a primary battery) / volumic energy (of a primary battery) ( )/ ( )energy efficiency (of a cell or battery) ( )Energy level Energy losses Energy not supplied energy of a battery energy output (of a primary battery) ( )Energy reserve of a reservoir Energy shortfall energy storage capacitor engineers pliers (combination pliers) ()engineers wrench, single head enhanced performance architecture (EPA) Entering edge (leading edge) ( )Entrance angle envelopeEnvelope of an amplitude modulated signal Equal energy spectrum Equality of brightness photometer Equality of contrast photometer equalizerequalizing charge Equilibrium length - Equilibrium mode distribution length Equilibrium mode distribution - Steady state condition equilibrium radiation pattern equipment failure information equipment failure information Equipotential bonding Equipotential bonding Equipotential bonding conductor Equipotential bonding system / EBS (abbreviation) Equipotential bonding terminal Equipotentiality equivalent binary content equivalent bit rate Equivalent contrast (of a task) ( )equivalent dead time Equivalent flicker voltage fluctuation equivalent interruption duration (annual,monthly) (Load weighted) (/ )Equivalent luminance (Leq) Equivalent network equivalent random circuit group equivalent random traffic intensity equivalent series resistance (of capacitor) ()equivalent span ; ruling span equivalent step index profile ESI-profile (abbreviation) / equivalent time constant Equivalent veiling luminance erroneous overreaching erroneous underreaching Errorerror burst error control error detecting code error multiplication / error extension error multiplication factor error ratio error signal error spread error variable errored second ES (abbreviation) error-free second EFS (abbreviation) Ery thermal radiation erythema (actinic) Escape lighting ESI refractive index difference Essential auxiliary circuits EstimatedevaluatingEvaluation (of a residual current) ( )evanescent field event information event information Event recorder excavationExcess energy meter exchange call set-up delay exchange coefficient (mutual) ( )Exchange - Switching unit - Switching entity - Switching office ( ) ( ) ( )Excitation excitation of transductor Excitation purity [Pe] [Pe]Excitation spectrum ( - )excitation system excitation system ceiling current ()excitation system ceiling voltage ()excitation system output terminals excitation system rated current excitation system rated voltage excitation winding excitation winding exciterexciter response exciting current ( )expanded conductor Expanded scale instrument expedited (N)- service- data- unit; (N)- expedited- data- unit ()expended pile; bulb pile; under-reamed pile ( )expert system Explosion (of an explosive atmosphere) ( )Explosive atmosphere ( )Explosive dust atmosphere Explosive gas atmosphere Explosive test mixture Exposed conductive part ()Exposed conductive part exposed conductive part Exposed-conductive-part Exposure (of a telecommunication line to a power line) ( )Exposure meter expulsion fuse Expulsion type arrester extendable universal hand pole (stick) extended processing function extended rating current extended rating current transformer extender extending ladder (extension ladder) extension bar external blocking external commutation External conductor External disabled state External disabled time External loss time external fault external gas pressure cable External influences External insulation External overvoltage external quenching External triggering[synchronization] External triggering[synchronization] Externally reflected component of daylight factor Extra-heavy duty rigid steel conduit EHDRS (abbreviation) Extraneous conductive part Extraneous-conductive-part ExtrapolatedExtraterrestrial solar radiation extreme range of an influencing quantity (factor) () Extreme range of an influencing quantity (for a residual current device) ( )extrinsic joint loss - Misalignment loss extruded insulation fabricFace luminaire () face shield Facesfacsimile ; telecopy Fail safe FailureFailureFailure analysis Failure cause failure intensity (Instantaneous ) Failure intensity acceleration factor failure load Failure mechanism failure rate (Instantaneous ) Failure rate acceleration factor Failure to operate failure to operate of protection, failure to trip (USA) Fall time (of a detector) false firing fan housing fan-shield Far-field diffraction pattern - Fraunhofer diffraction pattern ""Far-field radiation pattern - Far-field pattern far-field region Farm tariff fast select Faultfault impedance ()Fault (in electric power systems)( )Fault analysis Fault clearance Fault clearance time fault clearance time, clearing time (USA) Fault correction Fault correction time Fault coverage Fault current fault current interruption time, interruption time (USA) Fault diagnosis Fault diagnosis time Fault impedance Fault localization Fault localization time Fault location Fault locator Fault masking Fault mode Fault modes and effects analysis FMEA (abbreviation ) Fault modes, effects and criticality analysis FMECA (abbreviation ) Fault protection () Fault recognition fault state range Fault tolerance Fault tree Fault tree analysis Faultyfaulty state information faulty state information Faure plate FDM link FDM ( )fed- in winding feedback path feedback signal feedback variable FeederFeeder bay Feeder circuit-breaker Feeder disconnector feedforward control Female connector Ferrodynamic instrument Ferro-resonance ferruleFibre axis - Optical axis ( )fibre buffer Fibre bundle - Bundle Fibre optic terminal device fibre optics fibre scattering Fibrillating current Fibrillation Fiducial error Fiducial value field coil field coil flange Field data ()field element field pole field spool field spool insulation field system Field test field winding field winding terminals Fifty per cent disruptive discharge voltage figure of merit Filamentfilament (mono) ()filled and charged (secondary) battery () filled discharged (secondary) battery () filled insulating liquid fillerfiller (in a plastic)- fill-wave phase comparison protection, dual-comparer phase comparison protection (USA) film (plastic) ()film capacitor filter (optical) () filter capacitor ()Final circuit (of buildings) / Branch circuit (USA) ()final circuit group final controlling element final coolant Final tripping final voltage / cut-off voltage / finite function ()fire point Fire protection wall firingfiring failure first call attempt first choice circuit group fitting (of trunking or ducting systems) ( )Fixed (measuring) instrument Fixed cable reel Fixed cost Fixed equipment Fixed light Fixed payment tariff fixed programmed control fixed set-point control Fixed socket-outlet ( )fixed trip mechanical switching device fixed-double-prong head ()Fixing device fixing device Flag terminal flame-arrester vent plug, flame retardant vent plug (deprecated) Flameproof bushing Flameproof enclosure d (of electrical apparatus for explosive gas atmospheres) d ( )Flameproof joint Flameproof luminaire; explosion-proof luminaire () /flash barrier Flash point flash point Flash tube ; electronic-flash lamp Flashing light flashover flashover (of an insulator) Flat (flat spot) ( )flat (multicore) cable flat (primary) cell / layer (primary) cell () / () flat formation Flat male tab () Flat male test tab flat or round nose pliers Flat pin terminal () Flat quick-connect termination () Flat rate tariff fleeting informationtransient information fleeting information; transient information Flexible (shunt) Flexible busbar flexible cable flexible conductor Flexible conduit flexible cover Flexible Drop flexible insulated spanner pole (flexible insulated wrench) flexible mica material ()flexible spanner head (flexible wrench head) Flicker Flicker photometer Flicker voltage range Flickermeter Float floating battery Floating input(output) Floating input(output) Flood lighting flood lubricated bearing Floodlight Floor access unit Floor service unit flow control (in the communication sense) Fluctuationsfluid-filled cable; liquid filled cable; oil-filled cable , fluid-filled pipe-type cable; liquid filled pipe-type cable; oil-filled pipe-type cable , fluidised bed coating Fluidised-bed boiler ( ) FluorescenceFluorescent lamp Flush mica or insulated Flux code ( )Flux meter Flux triplet (of a source) flyback converter flying angle support ; running angle support ()foamFollow-on rate ;final rate follow-up control foot; footing forced characteristic (of a line commutated converter ) Forced draught cooling tower forced lubricated bearing Forced outage Forced-outage duration fork; K frame (K)Form factor (between two surfaces) formed-wire tool forward breakdown forward converter forward path foundationfour - quadrant converter Four concentric circle near-field template Four concentric circle refractive index template Four-switch mesh substation with mesh opening disconnectors Four-switch substation () four-wire terminal (de cuatro hilos) / four-wire circuit four-wire repeater four-wire transmission Fovea; fovea centralism / Foveola fractional slot winding frameframe (in TDM) ( )frame alignment frame alignment recovery time frame alignment signal frame alignment time-slot frame delimiter frame format frame leakage protection, case ground protection (USA), frame ground protection (USA) frame slip frame start ( )frame surface cooled machine frame synchronization frame transmission efficiency frame yoke Francis turbine freefree current operation natural excitation free -wheeling arm Free-running time base Freezing current frequency band Frequency band frequency changer set frequency comparison pilot frequency converter frequency converter (rotating) ()Frequency converter substation Frequency deviation frequency deviation (Absolute) ()frequency division frequency division multiplexing / FDM (abbreviation|) Frequency drift Frequency meter ()Frequency modulated signal generator Frequency modulation Frequency modulation distortion Frequency range Frequency reduction frequency response frequency response characteristicbode diagram frequency response characteristic(of an a.c. machine) ( )frequency response locusinquest plot )frequency shift keying (FSK);frequency shift modulation / frequency spectrum Frequency stability frequency translation Fresnel reflection " "Fresnel reflection method ""Fresnel spotlight frog -leg winding front- end processor Front face (front) Front fog light Front of a voltage impulse ()Front position light front span Frosted bulb fuel (primary) cell Fuel cell Fuel cost adjustment clause Full disconnection full distance protection () full duration half maximum (of a pulse) FDHM (abbreviation) full echo suppressor Full lightning impulse full load full load value full pitch winding full width half maximum FWHM (abbreviation) full-power tapping fully charged state (of a cell or battery) ( )fully controllable connection fully insulated current transformer fully provided circuit group Function -affecting maintenance ()function chart Function check-out function command function command functional block Functional bonding conductor functional diagram Functional earthing / Functional grounding(US) / Functional earthing conductor / Functional grounding conductor (US) Functional equipotential bonding system / FEBS (abbreviation) Functional insulation Functional mode functional profile (FP) Functional switching Functional-equipotential-bonding Function-degrading maintenance ()Function-permitting maintenance ()Function-preventing maintenance fundamental factor fundamental power fusefuse carrier fuse holder fuse-base fused by-pass jumper Fused plug ( ) fused quartz fused silicavitreous silica fuse-disconnector (fuse-isolator) fuse-element fuse-link (fuse-unit) fuse-switch- Fusion frequency ; critical flicker frequency fusion splice fuzzy control gainGain (of a measuring instrument) ( )gain crossover frequency gain margin gain response amplitude response Galvanometer Gap (of flameproof joint) gap gauge gas content (of an insulating liquid gas formation Gas insulated line / Gas insulated circuit (deprecated) / GIC (deprecated) Gas insulated metal-enclosed substation gas release gas seal Gas turbine set gas-absorbing liquid gas-evolving liquid Gas-filled (incandescent) lamp gas-or vapour-proof machine gassing gassing (under electrical stress) ( )gastight sealed (secondary) cell () gatewaygaussian beam Gaussian pulse gelgelgel point gel time General artificial ventilation General diffused lighting general interrogation command general interrogation command General lighting general purpose motor Generating mix forecast Generating set Generation of electricity Generation schedule Generation system generatorgeneric pulse code modulation / generic PCM (abbreviation) Geographical range Geometric extent (of a beam of rays) [G] geometric opticsray optics Geothermal power station Germicidal radiation girder clamp (saddle) suspension attachment Glare Glare by reflection glassglazeglaze (on ceramic) ( )glaze (on paper or board) ( )Global illuminance (Eg) (Eg)Global solar radiation Globe GlossGlossmeter ()Glow discharge go channel / transmit channel Goniophotometer Gonioradiometer grade of service graded index fibre graded index profile Gradual failure Drift failure Grassmanns law Gravity dam greaseproof (paper) Grey body; gray body grillage foundation Grooved cable - Slotted core cable Grooved top GroovingGross (net) thermal efficiency of a unit Gross (net) thermal efficiency of a unit Gross (net)average heat rate of a unit Gross (net)average heat rate of a unit Gross head of a hydroelectric power station Gross output of a power station Gross output of a set ground (US) (Local) earth / (Local) ( )ground clearance group ()groupGroup (of an electrical apparatus for explosive atmospheres) ( )group (of profiles) ( )group A (obsolete term) / basic group A (deprecated) ()()group alarm group alarm group carrier frequencies group command group command group control level group definition group descriptor group descriptor attributes group distribution frame group index (symb : N) group link group management group modulating equipment ()group number group of information elements group of information objects group reference pilot group section group size group translating equipment / group bank (USA) group type group velocity guard band guideguide bearing guided wave hack saw hairpin coil half - coil half - controllable connection half - cycle transductor ( ) half- duplex transmission; half- duplex traffic half echo suppressor Half-peak divergence; one-half-peak spread Half-value angle half-wave phase comparison protection, signal comparer phase comparison protection (USA) halving interval,HIC (abbreviation) hammerhamming distance hand pole (stick) Hand pole / hand stick Hand-held equipment Hand-lamp; trouble lamp Handling assemblies Hard carbon Hard glass bulb hardening agent, hardener - hardware failure hard-wired programmed control harmonic content harmonic factorTHF(abbreviation)( total ) ()Harmonic resonance harmonic test Haulageway luminaire () Hazard warning signal (on a vehicle) ()Hazardous area (on account of explosive gas atmospheres) ( )Hazardous live-part () Hazardous-live-part Headed brush Headlight; headlamp Headpiece heat bondable mica material () heat exchanger heater plate mica )heating cable Heating tariff Helically grooved slip-ring Heliotherapy Helmholtz-Kohlrausch phenomenon Hemeralopia; night-blindnesshermetically sealed (secondary) cell () heterojunction heteropolar machine heuristic program hierarchic mutually synchronized network hierarchic synchronized network hierarchical control High [medium][low] voltage tariff () ()High bar high conductivity polymer high frequency capacitance (of a capacitor) high impedance differential protection High intensity discharge lamp; HID high level data link control protocols (HDLC) High or proud mica or insulation High pressure mercury lamp High pressure sodium lamp High reliability power line (according to CCITT) high resistance fault High speed automatic reclosing high usage circuit group high vacuum valve device High voltage (abbreviation:HV) high voltage capacitor (of a capacitor voltage transformer) ( )high voltage terminal ()High[medium][low] voltage consumer () Highest (lowest) voltage of a system Highest (lowest) voltage of a system Highest voltage for equipment highest voltage for equipment Um (applicable to a transformer or reactor winding) ( )high-frequency repeater distribution frame / HFRDF (abbreviation) high-voltage capacitor (of a capacitor divider) High-voltage d.c. link / HVDC link high-voltage winding highway / bus. hill-side extension hold - off interval holding element holding fork holding time hollow conductor hollow conductor hollow insulator homogeneous cladding homojunction homopolar machine hook ladder hook pole (retractable hook stick) ( )hook pole adaptor (retractable hook stick adaptor) hook pole extension (retractable hook stick extension) Hook terminal () horizontal configuration hose- ()Hot cathode lamp Hot stand-by Hot start-up of a thermal generating set () Hourly [half-hourly] [quarter-hourly] [n-minute]etc.demand ( ) ( )Hue Humhuman intervention huntinghuntingHunting of interconnected synchronous machines hybrid configurationcomposite configuration ( in telecontrol) ( )hybrid configuration; composite configuration hybrid mode hydraulic compression head hydraulic cutter head hydraulic hose hydraulic pump Hydroelectric installation Hydroelectric power station Hydroelectric set hydrogen treatment hydrolytic stability hydrolyzable chlorine (in ascarels) hysteresis hysteresis coupling () hysteresis motor ice load ideal no- load direct voltage ideal self - excitation ideal synchronizing identification ( of a system) ()Identification beacon idleidle circuit conditions idle interval (of a valve arm) ( )idle state Idle state Free state Idle time Free time Ignition temperature of an explosive gas atmosphere IgnitorIlluminance (Ev; E)Illuminance meter ()Illuminance vector (at a point) ()Illuminant Illuminant (perceived) colour shift Illuminant colorimetric shift impedance drop Impedance earthed (neutral) system Impedance earthed neutral system / Impedance grounded neutral system (US) Impedance to earth Impedance to earth Impedance to ground(USA) impedance voltage at rated current (for the principal tapping) ( )implementation conformance statement (ICS) imported backfill impregnated paper insulation impregnatingimpregnating- impregnating - impregnating resin ( ) Impulse chopped on the front Impulse chopped on the tail Impulse generator impulse response impulse test Impulse type turbine IncandescenceIncandescent (electric) lamp ()inching inching (jogging) Incidence matrix ()Incidentincoherence incoherent radiation incoming circuit incoming response delay incoming traffic incomplete bridge connection Incorporated hand-operated device (of a remote control switch) ( )Incorporated switch incorrect operation of protection, incorrect operation of relay system (USA) Increased safety e (for electrical apparatus for explosive gas atmospheres) e ( )incremental command incremental information incremental information Incremental range Indenture level ( for maintenance ) ()Independent earth electrode / Independent ground electrode (US) independent manual operation (of a mechanical switching device) independent-time measuring relay Indeterminate fault Index (of an indicating device) ( )index dip index matching material indicated value Indicating (measuring) instrument () indicating device (indicator) ()Indicating device(of a measuring instrument) indicationindication (primitive) ( )Indication of a measuring instrument () Indicatrix of diffusion; scattering indicatrix indirect ( power) conversion Indirect (method of) measurement() indirect a.c. / d.c. converter / indirect a.c. converter Indirect acting instrument Indirect actuation indirect calculation of efficiency indirect commutation Indirect contact Indirect contact indirect cooled winding indirect current link a.c converter indirect d.c. converter Indirect entry (into electrical apparatus) indirect flux (on a surface) ( )indirect inverter Indirect lighting Indirect lightning strike indirect over-current release indirect rectifier indirect voltage link a.c. converter individual control level individually screened cable; radial field cable indoor bushing ( )indoor post insulator Indoor substation indoor switchgear and controlgear indoor termination indoor-immersed bushing induction coupling () induction frequency converter induction generator Induction instrument Induction luminaire () induction machine Induction meter induction period inductive direct voltage regulation inductor frequency converter inductor machine Industrial tariff inference engine Infinite bus Influence coefficient influence quantity Influence quantity ( )influencing quantity (factor) () Influencing quantity (for a residual current device) ( )informationinformationinformation capacity information capacity (in telecontrol) ( )information element information object information parameter information transfer efficiency information transfer efficiency (in telecontrol) ( )information transfer rate information transfer rate (in telecontrol) ( )infrared IR (abbreviation) Infrared lamp Infrared radiation inherent (of a generator) ( )inherent braking torque () inherent characteristic of a system inherent delay angle inherent direct voltage regulation inherent regulation (of a motor ) ( )Inherent stability of a power system ()inhibited insulating oil inhibitorinitial aperiodic component of short - circuit current initial charge initial closed-circuit voltage initial condition initial periodic short- circuit current initial temperature (of a cell or battery) ( )initial voltage (of a cell or battery) ( )initiatorInjection laser diode - ILD (abbreviation ) - Semiconductor laser - Diode laser injection locked laser inner covering inner sheath; inner jacket Inner side i.e. winding side In-phase (voltage)control Input (for a detector of optical radiation) Input (output)impedance Input (output)impedance ()Input and output with isolated common point input circuit input energizing quantity input matrix input power(of machine) ()input signal (of a transmission system) / transmitted source signal ( )input time constant input variable inrush current insertion loss (of an optical component) Installation flux density (for an interior lighting) ( )Installed lamp flux density (for an interior lighting) ( )Installed load Instant of timeInstantaneousInstantaneous availability instantaneous measurand Instantaneous non-tripping current (symbol Ini) (: Ini)instantaneous protection instantaneous release Instantaneous tripping current (of a circuit-breaker) ( )Instantaneous unavailability Instructed person ()instructed person (Electrically) ()instruction commandstandard command instruction command; standard command Instrument autotransformer instrument lead Instrument lead instrument security factor (FS) Instrument transformer Instrument with contacts Instrument with locking device Instrument with optical index Instrument with suppressed zero instrumentation insulated bearing housing insulated bearing pedestal insulated cable Insulated flexible Insulated gloves method / rubber gloves method (USA) ( insulated shield cable system Insulated tool insulated tool Insulated top insulating arm sleeves insulating blanket clamp (clothes pin) insulating boots insulating clothing Insulating components Insulating conduit Insulating conduit fitting insulating gas Insulating gins insulating gloves insulating hanger insulating ladder insulating liquid Insulating material insulating material insulating oiler pole (insulated oiler stick) insulating or insulated hand tools insulating overshoes Insulating tool insulating tool insulating-glove cover insulation (of a cable) ()Insulation co-ordination Insulation fault Insulation fault detecting instrument Insulation level Insulation of equipment Insulation piercing connecting device IPCD (abbreviation) insulation resistance Insulation resistance meter insulation resistance test insulation screen; core screen ( ) ( ) ()Insulation test voltage insulatorinsulator ball guide ()insulator cradle Insulator cradle ( )insulator fork insulator protective fitting insulator set insulator set insulator string insulator string Insulator support assembly integral action coefficient integral action time integral element l- element integral slot winding Integral switching device Integrated conductor Integrated optical circuit - IOC (abbreviation ) integrated service digital network (ISDN) Integrated switch integrated total; integrated value Integrating (measuring) instrument () Integrating photometer ()Integrating sphere intensity intensity deprecatedintercell connector interchange format and representation profile Interchange point Interchangeable accessory Inter-circuit wiring Interconnected operation Interconnected systems Interconnection (of power systems) Interconnection cord set Interconnection coupler interfaceinterfaceinterfacial tension interferenceInterferenceinterference filter Interferometer interharmonics Interlock of a plug () interlock signal Interlocked socket outlet () interlocking device Intermediate adaptor (for accessories) () ()intermediate state information intermediate state information intermediate support intermediate system intermediate voltage capacitor (of a capacitor divider) intermediate voltage capacitor (of a capacitor voltage transformer) ( )intermediate voltage terminal (of a capacitor divider) intermediate voltage terminal (of a capacitor voltage transformer) ( )intermediate-voltage winding Intermittent fault Intermittent fault Volatile fault transient fault intermittent flow (of direct current ) ( )intermittent periodic duty with startingduty type S4 S4intermittent periodic duty with electric brakingduty type S5 intermittent periodic dutyduty type S3 S3intermittent service test Internal angle of an alternator internal blocking Internal brush drop internal burden (of a current transformer) Internal combustion set Internal conductor internal fault internal fuse of a capacitor internal gas pressure cable Internal insulation internal model control Internal overvoltage internal traffic Internal triggering[synchronization] Internal triggering[synchronization] Internally reflected component of daylight factor International standard international standardized profile internet working ()interphase transformer Interreflection ; interflection Interreflection ratio interrogation command interrogation command interrogative telecontol system Interruptible load Interruption ( )Interruption ( of service ) Break ( of service ) ()Interruption duration Interruption duration Interruption of supply intersystem fault intertripping underreach protection (IUP) (abbreviation), direct underreaching transfer trip protection (USA) (DUTT) (abbreviation) intertripping, transfer tripping (USA) interturn insulation interturn testturn-on-turn test Interwinding fault intramodal distortion - Chromatic distortion Intrinsic error Intrinsic joint loss IntrinsicInherentIntrinsically safe luminaire () Intrinsically-safe circuit Intrinsically-safe electrical apparatus inverse time-delay over-current release inversion (electronic) (power) inversion factor invertedinverterinvertor ion exchange technique ionic valve devicegas - filled valve device Irradiance (Ee; E) ( )irradianceintensity (deprecated) Island (of a power system) ( )Islanding / network splitting isochronous ()Iso-illuminance curve ()Iso-intensity curve;iso-intensity line Iso-intensity diagram ; isocandela diagram Isolated neutral system Isolated neutral system Isolated operation isolating distance (of a pole of a mechanical switching device) ( )IsolationIsolation of a unit isolatorIsoluminance curve ()Isophase light Isotropic diffuse reflection Isotropic diffuse transmission isotrople (for electromagnetic waves) Item - Entity- jack shaft jacket (of a primary battery) japanese tissue paper Jet recorder ()jitter (in digital transmission) ( )joint joint-sleeve insulation Joule-integral (It) journal (of a shaft ) ( )journal bearing jump phenomenon jumper Jumper board jumper flag; jumper lug jumper terminal ()jumping characteristic JunctionJunction block Junction box justifiable digit time-slot / stuffable digit time-slot justification ratio / stuffing ratio / justification / pulse stuffingjustification capacity / stuffing capacity / maximum stuffing rate / maximum justification rate / justification instant / stuffing instant justification rate / stuffing rate / justification service digit / stuffing service digit. ( ) justifying digit / stuffing digit ( ) K bracing; K panel Kkalman filter Kaplan turbine Kelvin (double)bridge Thomson (double)bridge () keyKilowatt-hour rate ; energy rate kinematic viscosity Kiosk substation knee point voltage knowledge base kraft capacitor paper kraft paper Laboratory test lacquer ladder extension lag element Lamberts (cosine) law ( )Lambertian radiator - Lambertian source Lambertian reflector Lambertian surface lamert's cosine lawcosine emission law laminate laminated core laminated frame lampLamp voltage (of a discharge lamp) ( )Lampholder Landing light lap winding lapped insulation Laser Laser Lasing threshold last choice circuit group Latching remote control switch latching valve device Latent fault Lateral light Lateral mark Lateral offset loss - Transverse offset loss latexlattice tower Launch numerical aperture - LNA ( abbreviation ) lay ratio lay ratio; lay factor ()layerlead element lead-acid battery - Leading lights Leading marks leakage (of a primary battery) ()Leakage current Leakage current (in an installation) ( )Leaky mode - Tunnelling mode - Leaky ray - Tunnelling ray - Learning process ( for reliability ) ()Leaving edge (trailing edge) ( )Leblanc connection Leclanch (primary) battery ()leg slope ( )legislative load Length of a scale division Length of flameproof joint / Length of flame path / Width of flameproof joint / / length of lay ()length of lay () Lens spotlight Let-go threshold (current) level compoundedflat compounded Level of maintenance level span leverLever switch lidlid sealing compound Life (of a lamp) Life test Life to X% failures lifetime control lifting yoke LightLightlight (perceived) ( )Light centre (of a source) ( )Light emitting diode - LED (abbreviation ) Light emitting diode; LED light load test Light loss factor ; maintenance factor Light output ratio (of a luminaire) Luminaire efficiency () light ray Light signal Light stimulus Light vessel ; lightship lightvisible radiation Lighted buoy Lighthouse Lighting chain ; lighting string Lighting tariff Lighting technology; illuminating engineering Lighting; illumination Lightness (of a related color) Lightning arrester /surge diverter / surge arrester Lightning conductor Lightning impulse Lightning impulse protective level (of a protective device)