PEC 2017 – Appendix A Electrical Symbols

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Appendix A. Electrical Symbols

1.0 General Electrical Symbols

No.DESCRIPTIONSYMBOL
1.1Lightning Arrester
1.2Surge Arrester
1.3Ground (Earth)
1.4Ground (Frame)
1.5Service Entrance (Power)
1.6Service Entrance (Telephone)
1.7Kilowatt-Hour Meter
1.8Safety Switch
1.9Disconnect Switch
1.10Transfer Switch
1.11Circuit Breaker
1.12Fuse
1.13Fuse Cut-out
1.14Main Distribution Panelboard
1.15Power Panelboard
1.16Lighting Panelboard
1.17Motor Controller, 3 Pole Across-The-Line
1.18Combination Type Motor, Controller, ATL, Starter Plus Fused Disconnect Switch
1.19Combination Type Motor, Controller, ATL, Starter Plus Circuit Breaker
1.20OutletsCeilingWall
1. Incandescent Lamp
2. Vapor Discharge Lamo
3. Drop Cord Lamp
4. Exit Lamp
5. Fluorescent Lamp
6. Lamp Outlet with Pull Switch
7. Outlet with Blank Cover
8. Fan
9. Clock
1.20Outlets (continuation)
10. Single Convenience
11. Duplex Convenience
12. Weatherproof Convenience
13. Cooking Range
14. Convenience with Switch
15. Special Purpose (ACU, WH, D, R, etc.)
16. Floor (P,T,I)
17. Antenna
18. Microphone
19. Telephone
20. Intercom
1.21Switches
1. Single Pole
2. Duplex (2 single pole switches on one switch pole)
3. Triplex (3 single pole on one switch pole)
4. Double Pole
5. Three-Pole
6. Three-Way
7. Four-Way
8. Automatic Door
9. Key Operated
10. Master Selector
11. Remote Control
1.22Junction Box
1.23Pull Box
1.24Riser Up
1.25Riser Down
1.26Circuit Homerun
(Number Indicates Circuit No)
1.27Push Button
1.28Buzzer (Indicate Voltage)
1.29Bell (Indicate Voltage)
1.30Horn
1.31Amplifier
1.32Annunciator
1.33Loudspeaker
1.34Telephone Exchange
1.35Telephone Terminal Cabinet
1.36Fire Alarm System
1. Manual
2. Control Panel
3. Heat Detector
4. Flame Detector
5. Smoke Detector
6. Ionization Detector
1.37Wiring Symbols (cross-lines indicate number of wires)
1. Conduits
2. Open Wiring
3. Underground
4. Emergency
5. Fire Alarm
6. Telephone
7. Intercom
8. Bell System
9. TV Antenna
10. Close Circuit Television
11. Music
12. Clock
1.38Battery
1.39Resistor
1.40Inductor
1.41Capacitor
1.42Thermocouple
1.43Converter, Transmitter
1.44Single-Phase Bridge Rectifier
1.45Plug and Socket Device
1.46Filament Lamp
1.47Discharge Lamp

2.0 Rotating Machines

2.1AC Generator
2.2DC Generator
2.3AC Motor
2.4DC Motor
2.5Universal Motor
2.6Motor-Generator
2.7Three-Phase Induction Motor with Slipring Rotor
2.8Three-Phase Induction Motor with Squirrel-Cage Rotor
2.9Three-Phase Induction Motor with Squirrel-Cage Rotor
Both Ends of the Winding Brough out
2.10Single-Phase Induction Motor with Squirrel Cage Rotor
2.11Three-Phase Synchronous Generator, Star Connected,
Neutral Not Brough Out
2.12Three-Phase Synchronous Generator, Star Connected,
Neutral Brough Out
2.13Three-Phase Synchronous Generator with Permanent
Magnet Excitation
2.14Single-Phase Synchronous Generator with Permanent
Magnet Excitation
2.15DC-Shunt-Wound Generator, Interpole Windings Arranged
in Symmetry with Armature
2.16DC-Shunt-Wound Motor, Interpole Windings Arranged
in Symmetry with Armature
2.17DC Generator with Permanent Magnet Excitation
2.18Three-Phase Commutator Motor with Shunt Characteristic,
Rotor Fed
2.19Three-Phase Commutator Motor with Series Characteristic
2.20Change-Pole Squirrel-Cage Induction Motor for Charging
from 8 to 4 Poles, According to Dahlander
2.21Change-Pole Squirrel-Cage Induction Motor with Two
Separate Windings for Charging from 8 to 4 Poles and 6
Poles Respectively

3.0 Transformers and Reactors

3.1Transformer with Two Separate Windings
3.2Transformer with Three Separate Windings
3.3Auto-Transformer
3.4Reactor
3.5Current Transformer
3.6Voltage (Potential) Transformer

4.0 Releases

4.1Thermal Overload Release
4.2Magnetic Overcurrent Release
4.3Undervoltage Release
4.4Open-Circuit Shunt Release

5.0 Switchgear

5.1Make Contact (NO)
5.2Break Contact (NC)
5.3Change-Over Contact
5.4Change-Over Contact Make-Before-Break
5.5Time-Delayed Contacts
1. Make Contact, Delayed Make
2. Break Contact, Delayed Break
3. Make Contact, Delayed Break
4. Break Contact, Delayed Make
5.6Contactor with Thermal Overload Releases
5.7Triple-Pole Circuit Breaker with Latching Mechanism
5.8Triple-Pole Load-Break Switch
5.9Triple-Pole Fused Isolator
5.10Triple-Pole Isolator
5.11Isolating Link, Change-Over Type
5.12Single-Throw Switch, Manually Operated
5.13Spring-Return Switches
1. Manually Operated with 1 Normally Opened Contact
2. Manually Operated with 1 Normally closed Contact
3. Foot Operated
4. Cam Operated
5. Flow Speed Actuated
6. Pressure Actuated
7. Temperature Actuated
8. Liquid Level Actuated

6.0 Switchboard

6.1Main Switchboard
6.2Auxiliary Switchboard
6.3Emergency Switchboard
6.4Motor Control Center

7.0 Valves(Tubes), Semiconductors Elements

7.1Electronic Valve, Diode
7.2Electronic Valve, Triode
7.3Single Anode Rectifier Vessel with Mercury Cathode (Ignition)
7.4Semiconductor Diode
7.5Limiting Diode Uni-/Bidirectional
7.6Transistor
7.7Thyristor, General Symbol
7.8Photo-Resistor Bidirectional
7.9Photoelectric Cell
7.10Hall Generator
7.11Junction Field Effect Transistor with N-Type Channel

8. Measurement Devices

8.1Ammeter
8.2Voltmeter
8.3Double Voltmeter
8.4AC Kilowatthhour-Meter
8.5Varbourmeter
8.6Wattmeter
8.7Kilowatt-meter, Recording
8.8Varmeter, Recording
8.9Volt-Ampere Reactive Meter
8.10Power-Factor Meter
8.11Frequency Meter
8.12Tachometer
8.13Ground Detector
8.14Synchronoscope
8.15Ohmmeter
8.16Hour Meter, Running
8.17Instrument Shunt
8.18Synchro Rotor and Stator Three-Phase
8.19Synchro Rotor Single-Phase Stator Three-Phase

9.0 Digital Information Processing

9.1“AND” Gate
9.2“OR” Gate
9.3“NOT” Gate, Negater
9.4“NAND” Gate i.e., “AND” with Negated Output
9.5“NOR” Gate i.e., “OR” with Negated Output
9.6Exclusive OR Gate
9.7Delay Element, General Symbol
9.8Delay Element with Special Delay Times
9.9Bistable Element, General Symbol
9.10Monostable Element, Single Shot
9.11RS Bistable Element
9.12T Bistable Element, Binary Divider, Complementing Element
9.13Bidirectional Shift Register
9.14Four-Stage Bidirection Counter with Parallel Loading and Common Resets
9.15Negating Input
9.16Negating Output
9.17Input with Polarity Indicator
9.18Output with Polarity Indicator
9.19Static Input
9.20Dynamic Input
9.21Negated Dynamic Input
9.22Inhibiting Input
9.23Negating Inhibiting Input
9.24Input Not Carrying Logic Information
9.25Output Not Carrying Logic Information
9.26Extension Input

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