IEEE Graphic Symbols for Electrical and Electronic Diagrams

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Contents
Introduction........................................................................................................................................................1
A1 Scope................................................................................................................................................... 1
A2 Arrangement........................................................................................................................................ 2
A3 Application.......................................................................................................................................... 2
A4 Drafting Practices Applicable to Graphic Symbols ............................................................................. 3
Section 1 Qualifying Symbols .............................................................................................................5
1.1 Adjustability Variability ....................................................................................................................... 5
1.2 Special-Property Indicators.................................................................................................................. 7
1.3 Radiation Indicators (electromagnetic and particulate) ....................................................................... 8
1.4 Physical State Recognition Symbols.................................................................................................... 9
1.5 Test-Point Recognition Symbol ......................................................................................................... 10
1.6 Polarity Markings.............................................................................................................................. 10
1.7 Direction of Flow of Power, Signal, or Information.......................................................................... 12
1.8 Kind of Current (General).................................................................................................................. 13
1.9 Connection Symbol........................................................................................................................... 14
1.10 Envelope Enclosure...................................................................................................................... 17
1.11 Shield Shielding ................................................................................................................. 18
1.12 Special Connector or Cable Indicator .............................................................................................. 19
1.13 Electret (shown with electrodes)...................................................................................................... 19

Section 2 Graphic Symbols for Fundamental Items (not included in other sections)......................19
2.1 Resistor.............................................................................................................................................. 19
2.2 Capacitor ........................................................................................................................................... 24
2.3 Antenna ............................................................................................................................................ 28
2.4 Attenuator.......................................................................................................................................... 32
2.5 Battery............................................................................................................................................... 33
2.6 Delay Function Delay Line Slow-Wave Structure ............................................................................ 34
2.7 Oscillator Generalized Alternating-Current Source ..................................................................... 35
2.8 Permanent Magnet ............................................................................................................................ 35
2.9 Pickup Head ................................................................................................................... 35
2.10 Piezoelectric Crystal Unit (including Crystal Unit, Quartz ) .......................................................... 36
2.11 Transducer Accelerometer Motional Pickup Transducer .................................................................. 36
2.12 Squib, Electric ................................................................................................................................ 37
2.13 Thermocouple (dissimilar-metals device)........................................................................................ 37
2.14 Thermal Element Thermomechanical Transducer ................................................................. 38
2.15 Spark Gap Igniter Gap ...................................................................................................................................... 38
2.16 Continuous Loop Fire Detector (temperature sensor)...................................................................... 38
2.17 Ignitor Plug ..................................................................................................................................... 38

Section 3 Graphic Symbols for Transmission Path .........................................................................39
3.1 Transmission Path Conductor Cable Wiring........................................................................... 39
3.2 Distribution Lines Transmission Lines ............................................................................................. 45
3.3 Alternative or Conditional Wiring ..................................................................................................... 47
3.4 Associated or Future .......................................................................................................................... 47
3.5 Intentional Isolation of Direct-Current Path in Coaxial or Waveguide Applications........................ 48
3.6 Waveguide ....................................................................................................................................... 48
3.7 Strip-Type Transmission Line ........................................................................................................... 49
3.8 Termination....................................................................................................................................... 49
3.9 Circuit Return.................................................................................................................................... 50
3.10 Pressure Tight Bulkhead Cable Gland Cable Sealing End .................................................. 51

Section 4 Graphic Symbols for Contacts, Switches, Contactors, and Relays..................................52
4.1 Switching Function ............................................................................................................................ 52
4.2 Electrical Contact .............................................................................................................................. 52
4.3 Basic Contact Assemblies.................................................................................................................. 54
4.4 Magnetic Blowout Coil .................................................................................................................... 57
4.5 Operating Coil Relay Coil................................................................................................................ 57
4.6 Switch................................................................................................................................................ 58
4.7 Pushbutton, Momentary or Spring-Return......................................................................................... 59
4.8 Two-circuit, Maintained or Not Spring-Return ................................................................................. 60
4.9 Nonlocking Switch, Momentary or Spring-Return............................................................................ 60
4.10 Locking Switch ............................................................................................................................... 61
4.11 Combination Locking and Nonlocking Switch................................................................................ 62
4.12 Key-Type Switch Lever Switch .................................................................................... 62
4.13 Selector or Multiposition Switch ..................................................................................................... 63
4.14 Limit Switch Sensitive Switch .............................................................................................. 66
4.15 Safety Interlock ............................................................................................................................... 67
4.16 Switches with Time-Delay Feature.................................................................................................. 68
4.17 Flow-Actuated Switch...................................................................................................................... 69
4.18 Liquid-Level-Actuated Switch......................................................................................................... 69
4.19 Pressure- or Vacuum-Actuated Switch ............................................................................................ 69
4.20 Temperature-Actuated Switch ......................................................................................................... 70
4.21 Thermostat ...................................................................................................................................... 70
4.22 Flasher
Self-Interrupting Switch ................................................................................................................... 71
4.23 Foot-Operated Switch Foot Switch ...................................................................... 72
4.24 Switch Operated by Shaft Rotation and Responsive to Speed or Direction .................................... 72
4.25 Switches with Specific Features ...................................................................................................... 73
4.26 Telegraph Key ................................................................................................................................ 73
4.27 Governor (Contact-making) Speed Regulator..................................................................................... 74
4.28 Vibrator, Interrupter ........................................................................................................................ 74
4.29 Contactor......................................................................................................................................... 74
4.30 Relay .............................................................................................................................................. 76
4.31 Inertia Switch (operated by sudden deceleration)............................................................................ 78
4.32 Mercury Switch............................................................................................................................... 78
4.33 Aneroid Capsule (air pressure) Operated Switch............................................................................. 79

Section 5 Graphic Symbols for Terminals and Connectors ..............................................................................79
5.1 Terminals .......................................................................................................................................... 79
5.2 Cable Termination............................................................................................................................. 81
5.3 Connector Disconnecting Device Jack Plug ...................................................................................... 81
5.4 Connectors of the Type Commonly Used for Power-Supply Purposes ............................................ 84
5.5 Test Block ......................................................................................................................................... 86
5.6 Coaxial Connector Coaxial Junction................................................................................................ 86
5.7 Waveguide Flanges Waveguide Junction................................................................................ 87

Section 6 Graphic Symbols for Transformers, Inductors, and Windings .......................................88
6.1 Core................................................................................................................................................... 88
6.2 Inductor Winding (machine or transformer) Reactor Radio-Frequency Coil Telephone Retardation Coil  89
6.3 Transductor Saturable-Core Inductor Saturable-Core Reactor.............................................. 90
6.4 Transformer Telephone Induction Coil Telephone Repeating Coil ........................................... 92
6.5 Linear Coupler ............................................................................................................................... 100

Section 7 Graphic Symbols for Electron Tubes and Related Devices................................100
7.1 Electron Tube ................................................................................................................................. 100
7.2 General Notes.................................................................................................................................. 104
7.3 Typical Applications ........................................................................................................................ 105
7.4 Solion Ion-Diffusion Device ....................................................................................................................... 109
7.5 Coulomb Accumulator Electrochemical Step-Function Device ............................................. 110
7.6 Conductivity Cell ............................................................................................................................. 110
7.7 Nuclear-Radiation Detector (gas-filled) Ionization Chamber Proportional Counter Tube Geiger-Müller Counter Tube .............. 110

Section 8 Graphic Symbols for Semiconductor Devices ................................................................................111
8.1 Semiconductor Device Transistor Diode ............................................... 111
8.2 Element Symbols ............................................................................................................................. 111
8.3 Special-Property Indicators.............................................................................................................. 116
8.4 Rules for Drawing Style 1 Symbols................................................................................................. 117
8.5 Typical Applications, Two-Terminal Devices................................................................................. 118
8.6 Typical Applications, Three- (or more) Terminal Devices.............................................................. 123
8.7 Photosensitive Cell........................................................................................................................... 129
8.8 Semiconductor Thermocouple ......................................................................................................... 130
8.9 Hall Element Hall Generator................................................................................. 130
8.10 Photon-Coupled Isolator ................................................................................................................ 130
8.11 Solid-State Thyratron (replacement type)...................................................................................... 131
Section 9 Graphic Symbols for Circuit Protectors..........................................................................................132
9.1 Fuse (one-time thermal current-overload device)............................................................................ 132
9.2 Current Limiter (for power cable).................................................................................................... 133
9.3 Lightning Arrester Arrester (electric surge, etc) Gap...................................................................... 134
9.4 Circuit Breaker ............................................................................................................................... 135
9.5 Protective Relay ............................................................................................................................... 136

Section 10 Graphic Symbols for Acoustic Devices ...........................................................................140
10.1 Audible-Signaling Device.............................................................................................................. 140
10.2 Microphone Telephone Transmitter .......................................................................... 142
10.3 Handset Operator’s Set................................................................................................................................ 142
10.4 Telephone Receiver Earphone Hearing-Aid Receiver............................................................................. 143

Section 11 Graphic Symbols for Lamps and Visual-Signaling Devices ........................................................144
11.1 Lamp ............................................................................................................................................. 144
11.2 Visual-Signaling Device ................................................................................................................ 146

Section 12 Graphic Symbols for Readout Devices.........................................................................................148
12.1 Meter ............................................................................................................................................. 148
12.2 Electromagnetically Operated Counter Message Register............................................................. 149

Section 13 Graphic Symbols for Rotating Machinery ....................................................................................150
13.1 Rotating Machine.......................................................................................................................... 150
13.2 Field, Generator or Motor .............................................................................................................. 151
13.3 Winding Connection Symbols ....................................................................................................... 152
13.4 Applications: Direct-Current Machines ......................................................................................... 153
13.5 Applications: Alternating-Current Machines................................................................................. 158
13.6 Applications: Alternating-Current Machines with Direct-Current Field Excitation ..................... 161
13.7 Applications: Alternating- and Direct-Current Composite............................................................ 162
13.8 Synchro ........................................................................................................................................ 163

Section 14 Graphic Symbols for Mechanical Functions..................................................................164
14.1 Mechanical Connection Mechanical Interlock.................................................................... 164
14.2 Mechanical Motion ........................................................................................................................ 165
14.3 Clutch Brake ............................................................................................................ 166
14.4 Manual Control .............................................................................................................................. 167

Section 15 Graphic Symbols Commonly Used in Connection with VHF, UHF, SHF Circuits.....................168
15.1 Discontinuity (Introducing intentional wave reflection)................................................................ 168
15.2 Coupling........................................................................................................................................ 170
15.3 Directional Coupler ....................................................................................................................... 172
15.4 Hybrid Directionally Selective Transmission Devices............................................................................... 173
15.5 Mode Transducer ........................................................................................................................... 174
15.6 Mode Suppressor........................................................................................................................... 175
15.7 Rotary Joint (radio-frequency rotary coupler) ............................................................................... 175
15.8 Nonreciprocal Devices................................................................................................................... 176
15.9 Resonator Tuned Cavity ................................................................................................................................ 177
15.10 Resonator (cavity-type) Tube....................................................................................................... 178
15.11 Magnetron ................................................................................................................................... 178
15.12 Velocity-Modulation (velocity-variation) Tube........................................................................... 179
15.13 Transmit-Receive (TR) Tube ....................................................................................................... 179
15.14 Traveling-Wave-Tube.................................................................................................................. 180
15.15 Balun ........................................................................................................................................... 182
15.16 Filter ............................................................................................................................................ 182
15.17 Phase Shifter (matched) ............................................................................................................... 182
15.18 Ferrite Bead Ring......................................................................................................................... 183
15.19 Line Stretcher (with female connectors shown) .......................................................................... 183

Section 16 Graphic Symbols for Composite Assemblies ....................................................................184
16.1 Circuit Assembly Circuit Subassembly Circuit Element ........................................................... 184
16.2 Amplifier ...................................................................................................................................... 185
16.3 Rectifier......................................................................................................................................... 187
16.4 Repeater (includes Telephone Repeater) ....................................................................................... 187
16.5 Network Artificial Line (other than delay line)................................................................... 188
16.6 Phase Shifter Phase-Changing Network.......................................................................... 188
16.7 Chopper ........................................................................................................................................ 189
16.8 Diode-Type Ring Demodulator Diode-Type Ring Modulator ..................................................... 190
16.9 Gyro Gyroscope Gyrocompass ............................................................ 190
16.10 Position Indicator ......................................................................................................................... 190
16.11 Position Transmitter.................................................................................................................... 191
16.12 Fire Extinguisher Actuator Heads................................................................................................ 191

Section 17 Graphic Symbols for Analog and Digital Logic Functions .............................................192
17.1 Operational Amplifier .................................................................................................................... 192
17.2 Summing Amplifier ....................................................................................................................... 192
17.3 Integrator (Amplifier) .................................................................................................................... 192
17.4 Electronic Multiplier ...................................................................................................................... 193
17.5 Electronic Divider .......................................................................................................................... 193
17.6 Electronic Function Generator ....................................................................................................... 193
17.7 Generalized Integrator.................................................................................................................... 193
17.8 Positional Servomechanism........................................................................................................... 193
17.9 Function Potentiometer .................................................................................................................. 193

Section 18 Graphic Symbols for Digital Logic Functions................................................................. 194
18.1 Digital Logic Functions ................................................................................................................. 194

Section 19 Graphic Symbols for Special-Purpose Maintenance Diagrams..........................................194
19.0 Introduction................................................................................................................................... 194
19.1 Data-Flow Code Signals ................................................................................................................ 195
19.2 Functional Circuits........................................................................................................................ 197

Section 20 Graphic Symbols Commonly Used on System Diagrams, Maps, and Charts .............198
20.1 Radio Station................................................................................................................................. 198
20.2 Space Station................................................................................................................................. 200
20.3 Exchange Equipment ..................................................................................................................... 201
20.4 Telegraph Repeater ........................................................................................................................ 201
20.5 Telegraph Equipment..................................................................................................................... 203
20.6 Telephone Set................................................................................................................................ 206

Section 21 Graphic Symbols Commonly Used on System Diagrams, Maps, and Charts ............208
21.1 Generating Station......................................................................................................................... 208
21.2 Hydroelectric Generating Station................................................................................................... 208
21.3 Thermoelectric Generating Station ................................................................................................ 209
21.4 Prime Mover (qualifying symbols) ................................................................................................ 210
21.5 Substation...................................................................................................................................... 210

Section 22 Class Designation Letters .......................................................................................211
22.1 Class Designation Letter ................................................................................................................ 211
22.2 Special Considerations for Class Designation Letter Assignment................................................. 211
22.3 Item Names ................................................................................................................................... 212
22.4 Class Designation Letters: Alphabetical List................................................................................. 212
22.5 Item Names: Alphabetical List ...................................................................................................... 220
22.6 Item Designations, IEC 113-2........................................................................................................ 220

Section 23 Referenced Standards and Canadian Standard Z99 Modifications...............................220
23.1 Referenced Standards .................................................................................................................... 220

100 Canadian Standard Z99 Modifications to American National Standard Y32.2-1975
(IEEE Std 315-1975)......................................................................................................................................221
Annex A (Informative) Cross Reference List of Changed Item Numbers .................................................................222
Annex B (Informative) Reference Data International Electrotechnical Commission (IEC) Publication 117:
Recommended Graphical Symbols.............................................................................................................223
Annex C (Informative) Revised or Deleted Symbols ........................225
Annex D (Informative) Revised or Deleted Symbols ......................................226
Annex E (Informative) Revised or Deleted Symbols ..............................236
Annex F (Informative) Cross-Reference List of Class Designation Letters.....241