Common Electrical Symbols
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1 T: F: W: E: Common Electrical Symbols This is not a definitive list of all symbols used in electrical identification, but merely a guide to some of the more commonly used symbols. Due to the number of variants used, there may have several symbols in this reference chart for the same type of equipment - these can vary dependent upon drawing package used. It is important to note that exact reference should always be sought from drawing producer to avoid errors. Location Symbols for General Installations Machine, general symbol * function etc Load, general symbol * details Motor starter, general symbol * Indicates type etc. Socket-outlet, general symbol Twin Socket-outlet, general symbol 1 gang un switched socket-outlet 2 gang un switched socket-outlet 1 gang switched socket-outlet 1 gang switched socket-outlet
2 Location Symbols for General Installations 2 gang switched socket-outlet 2 gang switched socket-outlet Connection unit fused as specified Switched connection unit fused as specified Switch, general symbol Switch, general symbol double pole 1 gang 1 way switch 1 gang 2 way switch 2 way switch, single pole 2 gang switch 3 gang switch
3 Location Symbols for General Installations Dimmer switch Intermediate switch Intermediate switch Pull switch, single-pole Push button Push button with neon indicator Clock, general symbol Time switch Time clock Key operated switch Cooker control unit
4 Location Symbols for General Installations Thermostat Bell (Audible) Buzzer (Audible) Siren (Audible) Horn Telephone handset, general symbol Lamp (Standard) Lamp Standard Filament Lamp Lamp (Flashing) Lighting outlet position - general symbol
5 Location Symbols for General Installations Fluorescent luminaire (rows indicate number of tubes) Wall mounted luminaire Self - contained emergency lighting luminaire Emergency lighting luminaire (or special circuit) Spot light Flood light Wall mounted fitting Socket outlet (power) with isolating transformer eg shaver outlet Water heater Extract fan
6 Location Symbols for General Installations Projector general symbol Distribution board or consumer unit Connection or junction box Socket Outlet (telecommunications) General Symbols Designated as follows: TP - Telephone M - Microphone FM - Frequency Modulation TV - Television TX - Telex - Loudspeaker
7 Switch Switch- fuse Fuse-switch Isolator (Disconnector), general symbol Disconnector - fuse (fuse combination unit) Fuse - disconnector Switch - disconnector Switch - disconnector - fuse (fuse combination unit) Fuse - switch - disconnector Capacitor, general symbol Inductor, coil, winding or choke Inductor, coil, winding or choke with magnetic core Semi Conductor Diode - general symbol
8 Microphone Loudspeaker Antenna, general symbol Machine, general symbol * Function M=Motor G=Generator Generator, general symbol Indicating instrument, general symbol * function V = Voltmeter A = Ammeter etc. Integrating instrument or Energy meter * function Wh = Watt-hour VArh = Volt ampere reactive hour Lamp, or signal lamp, general symbol Light Emitting Diode (LED)
9 Plug Male Socket (plug female) Coax Plug Male Slow Operating Relay - Delay On Wire Connections (Two Wires) Wire Connections (crossed) Wires Crossing (Not Connected) Terminal Connector Terminal Block Earth Connection Noiseless Earth Protective Earth Chassis Earth Equipotentiality Ammeter Circuit Breaker Voltmeter Selector Switch Normally Open Normally Closed Contactor Contactor
10 Limit Switch Thermal Overcurrent Mechanical Interlock Voltage Transformer Potentiometer Solenoid Valve Normally open Contact Change Over or 2 way Contact Made position Limit Switch Normally Closed Contact Fused Switch Open Contact Limit Switch Flow Switch Flow Switch Time Delay Delay on Closing Thermal Switch - Overload Temperature Switch Time Delay Delay on re-opening Thermal Switch - Overload Temperature Switch Pressure Switch Pressure Switch
11 Normally Open PB Normally Closed PB Emergency Stop PB Indication Contact Emergency Stop PB Pull Switch Pull Switch Turn/Rotary Switch Turn/Rotary Switch Contractor Coil Relay with AC Supply Slow Release Relay Delay Off General Relay (DC Supply)
12 Slow Operating Relay Delay On Mechanically Latched Relay Diode Diode Reverse Conducting Diode Reverse Blocking Zener Diode Transistor (PNP) Transistor (NPN) Light Emitting Diode (LED) Capacitor Bidirectional Triode Thyristor (Triac)
13 Diac Three-phase winding - Star Changer, general symbol Converter, general symbol Notes: (1) If the direction of change is not obvious, it may be indicated by an arrowhead on the outline of the symbol. (2) A symbol or legend indicating the input or output quantity, waveform etc. may be inserted in each half of the general symbol to show the nature of change. Rectifier Inverter Primary cell - longer line positive, shorter line negative Battery Fuse link, rated current in amperes This is not a definitive list of all symbols used in electrical identification, but merely a guide to some of the more commonly used symbols. Due to the number of variants used, there may have several symbols in this reference chart for the same type of equipment - these can vary dependent upon drawing package used. It is important to note that exact reference should always be sought from drawing producer to avoid errors.
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