IEC symbol forms

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Dd6 transformer connection referenceDd6 · SLD / Schematic Definite-time delay qualifier for measuring relayst · Schematic / SLD Delta winding connectionDELTA · SLD / Schematic Delta-delta transformerTX D-D · SLD / Schematic Delta-star transformerTX D-Y · SLD / Schematic Detuned capacitor bankDCB · SLD DIACDIAC · Schematic Diesel generator setDG · SLD Differential capacitorHCA1_S00573 · Schematic Differential voltmeterDELTA V · SLD / Schematic Dimmer switch plan markSD · GA DiodeD · Schematic Direct neutral earthing connection- · SLD Direct-current supply qualifierQ020201 · SLD / Schematic Directional measuring element qualifier→ · Schematic / SLD Disconnected mechanical couplingQ021217 · Schematic DisconnectorIsolator · SLD / Schematic Disconnector auxiliary NC contactDS AUX NC · SLD / Schematic Disconnector auxiliary NO contactDS AUX NO · SLD / Schematic Dish antenna symbolSAT · GA / Schematic Distribution board plan markDB · GA Disturbance recorderDFR · SLD / Schematic Door contact plan symbolDC · GA Door intercom station symbolIC · GA Double frequency meterHz Hz · SLD / Schematic Double junction of conductors- · Schematic / SLD Double spark gapF · Schematic Double voltmeterV V · SLD / Schematic Doubly-fed induction generatorDFIG · SLD / Schematic Duct smoke detector plan symbolDSD · GA Dump load controllerDLC · SLD / Schematic Duplex power receptacleHCN1RDUP · Schematic Dy5 transformer connection referenceDy5 · SLD / Schematic Dy11 transformer connection referenceDy11 · SLD / Schematic Dynamic voltage restorerDVR · SLD Dz0 transformer connection referenceDz0 · SLD / Schematic Dz6 transformer connection referenceDz6 · SLD / Schematic Early-break normally-closed contactNC EARLY · Schematic Early-make normally-open contactNO EARLY · Schematic Earth connectionEARTH · SLD / Schematic Earth electrodeE · SLD / GA Earth electrode with inspection pitE · GA / SLD Earth grid conductorEG · GA Earth-fault current relayK · Schematic / SLD Earth-fault voltage relayK · Schematic / SLD Earthing switchES · SLD / Schematic Electric space heater plan markHTR · GA Electrolytic capacitorC ELEC · SLD / Schematic Electromagnetic brake actuatorHSV1Y4 · Schematic Electrostatically screened transformerTX SCREEN · SLD / Schematic Emergency-operation qualifierQ021308 · Schematic Emergency-stop operatorE-stop · Schematic Energy meter repeaterkWh · Schematic Energy meter with maximum-demand indicatorkWh/MD · SLD / Schematic Energy meter with pulse transmitterkWh · SLD / Schematic Engaged mechanical couplingQ021218 · Schematic Event-count actuation qualifierQ021402 · Schematic Excess-energy meterkWh> · SLD / Schematic Exit sign luminaire plan markEXIT · GA Extract fan plan markEF · GA Feeder buswayBD · SLD / GA Feedthrough capacitorC FEED · SLD / Schematic Fibre-optic connectorX · Schematic Fibre-optic link symbolFO · Schematic / GA Fire alarm control panel plan symbolFACP · GA Fire alarm sounder plan symbolSNDR · GA Firefighter telephone outlet plan symbolFFT · GA Firewall symbolFW · Schematic Fixed-speed wind turbine generator (Type 1)WTG T1 · SLD Fixed-temperature heat detector plan symbolHD · GA Flame detector plan symbolFD · GA Flashing beaconBEACON FLASH · Schematic Flashing indicator lampLAMP FLASH · Schematic Flex outlet plateFO · GA Flexible bonding strapBS · Schematic / GA Flexible conductorW · Schematic / SLD Float and boost battery chargerBC · SLD / Schematic Float level switch NCLS FLOAT NC · Schematic Float level switch NOLS FLOAT NO · Schematic Floodlight plan markFL · GA Floor box outletFB · GA Flywheel energy storageFESS · SLD Foot-operated switchFOOT · Schematic Foot-operation qualifierQ021310 · Schematic Four-phase winding with accessible connectionQ060203 · SLD / Schematic Four-point current measurement selectorHSW1S95 · Schematic Four-position key selectorKEY SEL 4 · Schematic Four-position maintained selectorSEL 4 HOLD · Schematic Frame or chassis connection- · Schematic Frequency meterHz · SLD / Schematic Fuel cellFC · SLD / Schematic Full-converter wind turbine generator (Type 4)WTG T4 · SLD Functional earthFE · SLD / Schematic Functional equipotential bondingBOND FE · SLD / Schematic FuseFU · SLD / Schematic Fuse-switchFUSE SW · SLD / Schematic Fused connection unit plan markFCU · GA Fused switchSW FUSE · SLD / Schematic GalvanometerG · Schematic Gapped-core inductorL GAP · SLD / Schematic