GB/T 4728.1-1985 General rules for graphic symbols for electrical diagrams

GB/T 4728.1-1985 General Rules for Graphical Symbols for Electrical Drawings GB/T4728.1-1985 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Graphical symbols for electrical diagramsGeneral imformation
This standard specifies the general rules for graphic symbols used in drawing various electrical diagrams. GB4728 "Graphic Symbols for Electrical Diagrams" national standard includes the following 13 parts: GB 4728.1-85
GB 4728.2-84
GB 4728.3---84
GB 4728.4—85
GB 4728.5---85
GB 4728.6--84
GB 4728.7--84
GB 4728.8—84
GB 4728.9—85
GB 4728.10—85
GB 4728.11-85
GB 4728.12—85
Symbol elements, qualifiers and other commonly used symbols Wires and connecting devices
Passive components
Semiconductor tubes and electron tubes
Generation and conversion of electrical energy
Switches, control and protection devices
Measuring instruments, lights and signaling devices
Telecommunications: switching and peripheral equipment
Telecommunications: transmission
Power, lighting and telecommunications arrangements
Binary logic units
Analog units
GB 4728.1385
This standard was formulated with reference to the international standard IEC.617 "Graphical symbols for drawing". Summary
This standard consists of the following parts:
Part 1
Part 2
Part 3
Part 4
Part 5
Part 6
Symbol elements, qualifiers and other commonly used symbols such as: outline and housing, current and voltage types; UDC 621.3.012
.003:62/.63
GB 4728.1-85
Replaces GB312--64
Variability, direction of force, motion and flow, mechanical control; grounding and connection to the chassis, circuit components, etc. Wires and connecting devices
For example: wires, flexible, shielded or stranded wires, coaxial wires; terminals, wire connections, plugs and sockets, cable sealing terminals, etc.
Passive components
For example: resistors, capacitors, inductors, ferrite cores, magnetic memory matrices; piezoelectric crystals, electrets, delay lines, etc.
Semiconductors and electron tubes
For example: diodes, triodes, thyristors, electron tubes; radiation detection devices, etc. Generation and conversion of electrical energy
For example: windings; generators, motors: transformers; converters, etc.
Promulgated by the National Bureau of Standards on 1985-11-01
Implemented on 1986-05-01
Part 7
Part 8
Part 9
Part 10
Part 11
Part 12
Part 13
2 Terms and Definitions
Switches, Controls and Protective Devices
GB4728.1-85
For example: contacts, switches, thermal switches, proximity switches, contact switches, switch devices and control devices, starters: with or without relays, measuring relays; fuses, gaps, lightning arresters, etc. Measuring instruments, lamps and signal devices
For example: indicating, integrating and recording instruments, thermocouples, telemetering devices, electric clocks, position and pressure sensors, lamps, horns and bells, etc.
Telecommunications: switching and peripheral equipment
For example: switching systems, selectors: telephones, telegraph and data processing equipment, fax machines, transducers, recording and playback, etc.
Telecommunications: transmission
For example: communication circuits, antennas, radio stations, single-port, dual-port or multi-port waveguide devices, microwave masers, lasers, signal generators, converters, devices, modulators, demodulators, discriminators, hubs, multiplexers, pulse code modulation, spectrum diagrams, optical fiber transmission lines and devices, etc. Power, lighting and telecommunications layout
For example: power stations and substations; networks; cable distribution systems for audio and television, switches, socket leads, light leads, installation symbols, etc.
Binary logic unit
For example: qualifiers; associative symbols, combination and timing units: such as buffers, drivers and encoders, arithmetic units, delay units, bistable, monostable and unstable units, shift registers and counters and memories, etc. Analog unit
For example: qualifiers for analog and digital signal identification, qualifiers for amplifiers, function devices, coordinate converters, electric switches, etc.
The terminology of various graphic symbols in this standard is defined as follows: 2.1 Graphic symbol
A graphic, mark or character usually used in drawings or other documents to represent a device or concept. 2.2 Symbol element
A simple graphic with a definite meaning that must be combined with other graphics to form a complete symbol of a device or concept. For example, symbol elements such as filament, grid, anode, and tube shell form the symbol of an electron tube. When symbol elements are used in combination, their arrangement may not be consistent with the actual structure of the device represented by the symbol. 2.3 General symbol
A usually simple symbol used to indicate a type of product and the characteristics of such a product. 2.4 Qualifying symbol
A symbol added to other symbols to provide additional information. Note: Qualifying symbols cannot usually be used alone. However, general symbols can sometimes be used as qualifiers. For example, the general symbol of a capacitor added to the symbol of a microphone forms the symbol of a condenser microphone.
2.5 Box symbol
A simple graphic symbol used to indicate the combination of components, equipment, etc. and their functions, without giving the details of the components or equipment or considering all connections.
Note: Box symbols are usually used in drawings using single-line representation, and can also be used in drawings showing all input and output wiring. Other terms and terms appearing in this standard are not included in the content specified in this standard, but generally comply with the provisions of the International Electrotechnical Commission (IEV) and corresponding national standards.
3 Drawing of symbols
GB4728.1—85
The graphic symbols in this standard are drawn in a size that is easy to understand, and the symbols should be as proportional as possible. When arranging symbols, the distance between connecting lines should be the modulus (2.5mm), usually one (5mm), so as to mark the terminal.
Generally, symbols can be used directly in drawings, and in computer-aided drawing systems, symbols should be drawn on the grid (see Article 7).
The graphic symbols in this standard are drawn on a grid (see Appendix A), but the grid is not shown with the symbol. 4 Numbering of symbols
Each symbol in this standard is given a serial number. This serial number consists of three sections: a. The first section (2 digits), indicating the first part of this standard; b. The second section (2 digits or letters and numbers) indicates the section of the section; . The third section (2 digits) indicates the symbol of the section. The three sections are separated by a short dash "".
In each part of this standard, the sections are numbered consecutively starting from 01, and the appendices are numbered from A1 to A9. In each section, the symbols are numbered consecutively from 01 to 99. For example:
13 02 — 05
The 5th symbol
Section 2
Part 13
5 Use of symbols
: This standard gives symbol elements, qualifiers and general symbols as completely as possible, but only gives limited examples of combined symbols. If the symbols of certain specific devices or concepts are not specified in this standard, it is allowed to derive them through appropriate combinations of the specified symbols. In order to meet the requirements of different drawings or uses, the sizes of related symbols can be changed. For example, power transformers and measuring transformers often use symbols of different sizes.
The symbols in this standard can be reduced or enlarged as needed. When a symbol is used to limit another symbol, the symbol is often drawn in a reduced size. When the symbols are reduced or enlarged, the proportions of the symbols to each other and to the symbols themselves should remain unchanged. The symbol orientation shown in this standard is not mandatory. Without changing the meaning of the symbol, the symbol can be rotated or placed in a mirror image according to the needs of the drawing layout, but the text and the indication direction shall not be inverted. Wire symbols can be represented by lines of different widths. For the sake of clarity, symbols are usually shown with connecting lines. Unless otherwise specified, symbols are only shown in one form with connecting lines. Supplementary information can be added to most symbols. However, this standard only shows examples when there is a recommended method for representing such information.
Some symbols in this standard have several graphic forms, and the "preferred form" is for priority. Only one graphic form can be selected in the same electrical drawing, and the size of the graphic symbol and the thickness of the line should also be basically consistent. 3
Provisions for symbols to adapt to computer-aided drawing systems GB4728.1-85
In order to facilitate the use of symbols in this standard in computer-aided drawing systems, the following provisions are made: symbols should be designed to be used in a grid system with a specific module M. The module M used in this standard is 2.5mm. a.
The connecting lines of the symbols coincide with the grid lines and end at the intersection of the grid lines. c.
The side length of the rectangle and the diameter of the circle should be designed to be multiples of 2M. For smaller symbols, 1.5M, 1M or 0.5M is selected. d. There should be at least 2M between the two connecting lines to meet the internationally accepted minimum character height requirement of 2.5mm. Computer-aided drawing systems require that each symbol has a reference point located at the intersection of the grid. This standard does not specify the exact location of this reference point, but the grid in Appendix A will help to select appropriate points. Others
The graphic symbols specified in this standard are all shown in the positive state without voltage and external force. The text symbols, physical quantity symbols, etc. in the graphic symbols specified in this standard should be regarded as components of the graphic symbols, but these texts, physical quantity symbols, etc. are not included in the content specified in this standard. All graphic symbols in this standard that are the same as those in the international standard IEC617 are marked with "=\Connecting lines should be drawn on the grid lines as much as possible
GB4728.1-85
Appendix Abzxz.net
Network of computer-aided drawing system
(reference)
This line can also be used (such as the spacing between two connecting lines is 3M, 5M, etc.) for symbols with reduced size
In this standard, reference points are not shown together with symbols. However, the connecting lines of symbols have been drawn to coincide with the grid lines. Determination of reference points:
Make the connecting lines of symbols coincide with the grid lines The grid intersection is aligned and overlapped, so that the grid intersection is located at the outer end of the connecting line. a.
Select an appropriate grid intersection as a reference point. b.
For example:
Symbol 04-01-07
General symbols and limiting symbols usually do not draw connecting lines. Additional instructions:
GB4728.1—85
Symbol 05-0502
This standard was proposed by the Ministry of Machinery Industry of the People's Republic of China and is under the jurisdiction of the National Technical Committee for Standardization of Electrical Graphic Symbols. This standard was drafted by the Standardization Research Institute of the Ministry of Machinery Industry. The drafter of this standard is Wei Jianhua.
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