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WILLE Le UULEUs ae, , Table: 1.1. Electrical symbols, , , , Meaning of, , , , , , [ Symbol Component name, wires and supply system symbols, — Electrical wire Conductor of e cal current, , , , , , Connected wires, , Connected crossing, , , , , , Non-connected wires, , Wires are not connected, , , , , , DC current, , DC supply symbol, , , , Alternating current (AC), , |, AC supply symbol |, , , , 1—, AC supply, 50 Hz frequency |, , , , , , 3—, AC supply, 415 V, 50 Hz frequency, , , , 8— AC supply with neutral, 50 Hz frequency |, |, , , , , , , , , , , , , , , , N —_ Neutral |, + _— Positive polarity, _ = Negative polarity, 2 110V _ Direct current, 2 conductors, 110 V supply, 2N 220V — Direct current, 3 conductors including, , Neutral, 220 V supply, , , , , , , , , , Overhead line, , , , , , (Contd...)
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ELEUIniune vee, , , , , , , , —=—, , underground cable power supply, , , , , , , , Power Supply, = +, Ho Battery cell Generates constant voltage, |||! 7 Battery Combination of cells for gaining more voltage, , , , DC-voltage source, , Provides constant DC Volts, , , , Current source, , DC/AC current source provides constant current, irrespective of load variations, , , , AC Voltage source, , AC voltage source gives constant RMS AC voltage., , , , Generator, , Electrical voltage is generated by mechanical rotation, of the generator, , , , , , Controlled voltage, source, , Generates voltage as a function of voltage or current |, of other element |, , , , FF) 319) 9, , Controlled current, source, , Generates current as a function of voltage or current |, of other circuit element |, , , , Electrical Machines & Equipments, , 1, , , , AC generator, , It generates AC power, , , , DC generator, , It generates DC power, , , , DC motor, , DC Motor provides torque, , , , 3-@ Induction motor, , It represents a 3- phase squirrel cage induction motor, , , , 3-@ Induction motor, , It represents 3-® wound type induction motor, , , , Synchronous motor, , Synchronous motor runs with a constant speed, , , , , , | {=O Oe |0, , , , Mechanically coupled, machines, , , , This symbol represents that shaft of two rotating, , machines are mechanically coupled i.e., both, machines rotates at same speed, , , , , , (CantdA _)
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ELECTRICAL, , ENGINEERING, DESIGN, DRAWING AND ESTIMATION, , , , Two winding transformer, , Transformer with two separate windings, , , , Auto-transformer, , This is a single winding transformer, , , , Three phase (3 — ®), , It represents a 3— © Transformer with three separate, , , , , , , , , , o| <| DITR|c\aD, , Transformer windings star-star-delta., , Delta This symbol is used for representing delta (A), connections in 3-® system/transformers, , Star This symbol is used for representing star (Y) connection., Sometimes also called 'Wye' connections, , Terminal, , This symbol represents the terminals of an electrical |, equipment where supply is given or drawn |, |, , , , , , , , Motor starter, , This is a general symbol of starter, |, j, , , , , , , , , , M, , , , D.O.L (Direct-on- line), starter for reversing, , This starter is used for direct starting and reversing the, direction of rotation of motor., , , , , , , , Star-delta starter, , Star-delta starter is used to start a 3) induction motor, to reduce high starting current, , , , , , , , Auto-transformer, , This is basically an Auto-transformer connected before |, , , , , , , , , , , , a starter the supply and is operated accordingly, Rheostatic starter In this starter a rheostat is connected in series with, oo armature winding and is operated accordingly., , , , Instruments and Meters, , , , Indicating instrument, general symbol, , This is a general symbol, unit or symbol of the quantity is, written inside the circle which the meter measures, , , , , , , , , , COCO, , , , Voltmeter It measures electrical voltage and connected in parallel, Ammeter It measures electric current and is connected in series, Wattmeter, , , , It measures the real power (P = VI cos ®) or simple DC, , power (P = VI), _|, , , , , , (antd \
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ELECTRICAL SYMBOLS AND DRAWINGS, , , , , , , , Varmeter, , |, , It measures reactive power (Q = VI sin ®) in AC circuits, , , , Power factor meter, , This is used to measure power factor (P.F) in AC supply, connected load, , , , Ohmmeter, , This meter measures resistance of load, , , , UCO®, , Recording instrument, (general symbol), , This is the general symbol of recording instrument. Such, meters are used to record the measured quantity., , , , , , , , , , , , Integrating meter, , Such meters keep on adding the measured quantity, , , , , , , , Wh, , , , , , , , Watthour meter, , , , This meter is used to keep record of used electrical energy |, , , , [3, , Current transformer, , |, It is a special purpose transformer used to measure high |, currents in HV transmission lines., , , , 3c, , Potential transformer, , It is a special type of transformer used to measure high, voltage in HV transmission lines, , , , Domestic Electrical Appliances and Fittings, , , , , , Lamp, , This represents general lighting lamp, , , , , , j, |, |, |, |, Wiring on the surface |, |, |, , , , , , , , , , , , m m ~~, , ° -- Wiring in conduit, , x Lamp mounted on ceiling —, BK ioe Spot light Such type of light is used to light up a particular area, x a Flood light Flood light is used to light up a wide area., , aN For example: lights used in cricket fields, Ceiling fan =, , CO g, Exhaust fan —, , , , , , , , , , , , , , , , Fan regulator, switch, , , , Fan regulator is connected in series with controlling, switch, , , , =|, , , , (Contd...)
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OIF, , Heater, , , , , , Storage type water heater, , , , , , Bell, , , , ESIGN, DRAWING AND ESTIMATION, , ELECTRICAL ENGINEERING, F SN, DRAWING AND ESTIMATION., , , , , , heater with water storing capacity, , , , A simple electric bell, , , , , , Buzzer, , , , oe, m4, —C, , Socket outlet, 5A, , Socket outlet with a rating of 5A (max load 100 W), , , , —¢, , Socket outlet, 15A, , Socket outlet with a rating of 15A (max load 1000 Wj, , , , Plug, , , , Signal Lamp, , A signal lamp used to give signals, , , , An electrical fuse used as safety device against excesg, , , , Fuse, OF current or overload, o—EXt} ~, Switch and Relay, , , , Single Pole Single Through, (SPST) Toggle switch, , Disconnects current when open, , , , Single Pole Double Through, , Selects between two connections }, , , , , , , , , , , , , , (SPDT) Toggle switch, wv Push button switch (N.O) Momentary switch — Normally Open (NO), y, Push button switch (N.C) Momentary switch — Normally Closed (NC), tt, Se SPST Relay, | Relay open/close connection by an electromagnet, — SPDT Relay, o-—_l, St Jumper i j, mpi Close connection by jumper insertion on pins/By, , , , pass a particular component, , , , (Contd...)
