Published On: Tue, Jul 30th, 2019

Examples of Standard Graphical Symbols in the Practice

Author: Radoje Jankovic

Here I showing the graphical electrical symbols from practice useful for everyone of us.

These symbols are in accordance with IEC standards.

IMPORTANT NOTES:

In your work and during education use standard graphical symbols ONLY!

Don’t use non-standard graphical symbols !

If use you nonstandard graphical symbols you are not and can’t to be any expert.

Pictorial diagrams are permissible to use in educational purpose and in the practical wiring diagrams. Some examples are given here.

  1. Standard graphical symbols in electrical circuits for connecting wires or conductors  (a) and a wire joint (b).
(a)
(b)

2. Two examples of jointing wires or conductors, or various sizes of busbars

(a)
(b)

3. Standard symbol for three-phase three-line diagram of busbars and one feeder.

4. Standard single-line  of one three-phase busbars with three-phase feeder with three-pole circuit breaker. 

5. Standard single-line (left) and three-line diagram of circuit breaker (right) with overload relay and overcurrent relay (so called “protection circuit breaker”)

6. Standard graphical symbols in electrical circuits  for DC sources; (a &b ) DC voltage cell, (c&d) DC battery.

(a)
(b)
(c)
(d)

7. One more of  graphical symbols for batteries

8.Practical circuit of series connected DC cells with bulb

9. Practical circuit of series connected DC batteries

10. Practical circuit of parallel connected DC batteries

11. General graphical symbol for analog instrument

12. Standard graphical symbols in electrical circuits for: (a) ammeter, (b) voltmeter, (c) galvanometer

(a)
(b)

13. Standard graphical symbols for fixed value resistors

14. Standard graphical symbols for variable resistors

15. Standard graphical symbols for resistors with taps

16. Standard graphical symbols for semi-variable resistors, trimmers

17. Standard graphical symbols for shunt resistor

18. Standard graphical symbol for AC generator in single-line diagrams

19. Standard graphical symbol for AC motor in single-line diagrams.

20. Two type of standard three line graphical symbol for three-phase asynchronous electric motor in functional electrical diagrams

21. Standard three line graphical symbol for three-phase asynchronous electric motor with overload protection relay (bimetal or thermal overload relay.

22. Standard single-line (left) and three-line (right) symbols of three-phase asynchronous motor used in circuit diagrams

S23. tandard symbol for single-phase motor in the functional circuits

24. Practical symbol for three-phase asynchronous motor with parallel parts of stator windings connected in the triangle for 3×220 or 3×230 V AC

25. Practical symbol for three-phase asynchronous motor with parallel parts of stator windings connected in the star for 3×380 or 3×400 V AC

26. Practical symbol for three-phase asynchronous motor with parallel parts of stator windings connected in the triangle for 3 x 400, 3×440 or 3×460 V AC

27. Standard graphical symbol for transformer in single-line diagrams

28. Standard graphical symbol for three-phase step-down power transformer in single-line diagrams

29. Graphical symbols for manual ordinary (a)  and  change over switch (b)

(a)
(b)

30. Standard single-pole manual switch in open – OFF (a) and closed-ON (b) position

(a)
(b)

31. Two pole installation switch for switching phase and neutral conductor.

32. Two pole installation switch with signal light for switching phase and neutral conductor.

33. Standard wiring diagram of series installation switch in the wall box

34. Standard graphical symbol for a push button switch, normally open

35. Standard wiring symbol of push button switch in the installation wiring box, normally closed contact

36. Two standard wiring diagrams of changeover installation switch in the wall box

37. Standard wiring symbol for changeover installation switch with control of signal lamp inside.

38. Standard wiring symbol for manual, double changeover switch

39. Standard wiring diagram of ordinary installation switch with signal-control lamp in wall box

40. Standard wiring symbol for serial installation switch with signal or control lamp inside.

41. Standard wiring symbol for crossover installation switch without  control lamp inside in its wall box.

42. Standard wiring symbol for crossover installation switch with control lamp inside.

43. Crossover installation switch circuit for wall installation

44. Crossover installation switch circuit with signal lamp inside

45. Standard wiring diagram of ordinary installation switch S1 for lighting and the wall socket X1

46. Standard wiring diagram of one changeover installation switch S1 and the wall socket X1 with phase taken front the closed switch contact.

47. Standard wiring diagram of one changeover installation switch S1 with the control light and the wall socket X1 with phase taken front the closed switch contact.

48. Standard wiring symbol of installation pushbutton switch with NO contact and signal (control) lamp inside

49. Standard graphical symbol for signal or control neon lamp in installations switches.

50. Standard full single-phase plug and socket  symbol in the functional electrical circuits

51. Standard wiring diagram for socket with protective conductor in the box

52. Standard graphical symbols for impulse relay used in lighting installations.

53. Standard wiring diagram of timer for staircase lighting in its box

54. Standard graphical symbol for lamp without (a) and with  grounding contact (b)  in electrical electrical circuits.

(a)
(b)

55. Standard full graphical symbol of passive infrared motion detector or, short PIR motion detector.

56. Standard wiring in  junction boxes in line

57. Two ways of standard wiring three-line  of power circuit for reversing contactors

58. Star-delta power circuit wiring contactors

59. Three line circuit diagram of one four-wire feeder. The feeder is protected by melting fuses.

60. Old graphical symbol for a pushbutton

61. The complete circuit diagram of one circuit breaker

62. Three-phase power transformer. Input voltage is 3×400 V, secondary voltage is 3×19,5 V, and rated power of S=1500 VA

63. Single-phase transformer with taps for regulation of primary voltage

64. Three phase asynchronous motor with short-circuited rotor

65. Graphical symbols in practical use for single pole installation switch, ordinary switch.

66. Graphical symbols in practical use of two single switches for same circuits, known as group switches

67. Graphical symbols in practical use for series switch for lighting (two-in-one).

68. Graphical symbols in practical use for two- and three-pole switches

69. Graphical symbols in practical use for three-way or transfer switch (single above 4 symbols, and double below 3 symbols) for lighting installations

70. Single-line diagram of three-phase fusible (melting)  fuses

71. Graphical symbols for single-pole, two-pole and three-pole of manual switches in single-line installation diagrams and plans. First single-phase circuit, second  two-phase circuit and third three phase circuit. The load can be any kind.

72. Graphical symbols for signing installation two-pole sockets circuits per phase in the single-line installation diagrams and plans

73. Three-phase single line signing sockets in the single-line installation diagrams and plans with data of cables for wiring.

74. Graphical symbols for wall incandescent lamp circuits per phase in the single-line installation diagrams and plans with cable data for wiring.  

75. Graphical symbols for signing fluorescent lamps circuits per phase in the single-line installation diagrams and plans

76. Graphical symbols for fluorescent lamps with loads divided in three-phase lighting circuit in the single-line installation diagrams, manual three-pole switch and protection fuses in three phases.

77. Graphical symbol for signing water heater in the single-line installation diagrams and plans

78. Single-line, three-phase, four-wire system, distribution board with fusible fuses

79. Graphical representation of current transformer in all three phase. Three-line diagram

80. Four-line, three-phase system graphical presentation (busbars and feeder)

81. Three-wire pushbutton station with one N/C (S4) and one N/O key-pushbutton (S3) 

82. Three-wire control pushbutton station for local purpose of switching a machine.

83. Two-wire control pushbutton station

84. A example of three-phase feeder of control voltage with three-pole protection circuit breaker  (used as fuse)

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Examples of Standard Graphical Symbols in the Practice