GB/T 4728.3-1998 Graphical symbols for electrical schematics Part 3 Conductors and connectors
Some standard content:
GB/T 4728. 3 - 1998
This standard is equivalent to the International Electrotechnical Commission standard IEC617-3:1996 "Graphical symbols for schematic diagrams Part 3 Conductors and connectors".
This standard is a revision of GB4728.3-84 "Graphical symbols for electrical diagrams Part 3 Conductors and connectors". Compared with GB4728.3-84, the symbol classification and category names of this standard have changed significantly; 03-01-10, 03-02-08, 03-02-09, 03-02-10, 03-02-11, 03-02-12, 03-02-13, 03-02-14 in GB4728.3-84 have been deleted. , 03-02-15, 03-02-17, 03-03-02, 03-03-04, 03-03-06, 03-03-16, 03-03-17, 03-03-18, 03-03-26, 03-04-02, 03-04-03, etc. 19 symbols; 3 new symbols 03-02-15, 03-02-16, 03-02-17, etc.; the drawing methods of 03-02-03 and 03-03-11 are slightly changed. GB/T4728.3 is a part of the series standard "Graphic Symbols for Electrical Schematics". This series of standards includes the following parts:
GB4728.1 General principles of graphic symbols for electrical drawings GB/T4728.2 Graphic symbols for electrical schematics Symbol elements, limiting symbols and other commonly used symbols GB/T 4728.3
Graphic symbols for electrical schematics
Conductors and connectors
GB 4728.4
GB 4728.5
GB 4728. 6
GB 4728.7
GB 4728.8bzxz.net
GB 4728. 9
GB 4728. 10
GR 4728. 11
Graphical symbols for electrical diagrams Passive components
Semiconductor tubes and electron tubes
Graphical symbols for electrical diagrams
Graphical symbols for electrical diagrams
Graphical symbols for electrical diagrams
Graphical symbols for electrical diagrams
Graphical symbols for electrical diagrams
Graphical symbols for electrical diagrams
Graphical symbols for electrical diagrams
Generation and conversion of electrical energy
Switches, control and protection devices
Measuring instruments, lamps and signaling devices
Telecommunications: switching and peripheral equipment
Telecommunications: transmission
Electric lighting and telecommunications arrangements
GB/T4728.12Graphical symbols for electrical schematics GB/T 4728. 13
Graphic symbols for electrical schematics
Binary logic elements
Analog elements
The scope and referenced standards of this series are shown in IEC617-1. When revising GB4728.1, IEC617-1 will be used as the same. The national standard GB/T6988.2-1997 "Preparation of electrical technical documents Part 2 Functional schematics" cited in this standard is equivalent to IEC1082-2. The appendix B and appendix C of the original IEC617-3:1996 are French and English indexes respectively, which are deleted in this standard. Appendix B of this standard is the symbols added to GB4728.3--84 that are not in the original IEC617-3 (1st edition). From the date of implementation, this standard will replace GB4728.3--84 at the same time. Appendix A and Appendix B of this standard are both suggestive appendices. This standard is proposed and managed by the National Technical Committee for the Preparation of Electrical Documents and Graphic Symbols. This standard was drafted by the Mechanical Science Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are: Guo Ting, Li Shilin, Gao Huimin, Wei Yanjun, Meng Qinglan, Zhou Minfeng, Li Ping. 29
GB/T 4728. 3---1998
IEC Foreword
1) IEC (International Electrotechnical Commission) is a worldwide standardization organization that includes all national electrotechnical committees (IEC National Committees). The stated goal of IEC is to promote international cooperation on various issues related to standards in the electrical and electronic fields. For this purpose and other activities, IEC also publishes international standards. The formulation of international standards is entrusted to technical committees. Any IEC National Committee may participate in the standard-setting work if it is interested in the subject under study. International organizations, governments and non-governmental organizations that have relations with IEC may also participate in the standard-setting work. IEC and ISO work closely under the conditions determined by the agreement between them. 2) IEC formal resolutions and agreements on technical issues, developed by technical committees in which national committees with special interest in these issues participate, express as far as possible international consensus on the subject matter involved. 3) They are published in the form of standards, technical reports or guidelines and recommended for international use, and in this sense are accepted by the national committees.
4) In order to promote international unity, the IEC national committees undertake the task of applying IEC international standards to the greatest extent possible in their countries and regions. Any differences between IEC international standards and corresponding national or regional standards should be clearly indicated in the latter. International Standard IEC617-3 was drafted by 3A Technical Committee (Graphic Symbols for Diagrams) of IEC Technical Committee 3 (Documentation and Graphic Symbols).
This second edition abolishes and replaces the first edition of 1983 and has been technically revised. The text of this standard is based on the following documents:
Draft International Standard (FDIS)
3A(CO)208
3A/381/FDIS
Voting Full information on this standard can be found in the voting report mentioned in the table above. Annex A is for information only,
Voting report
3A(CO)220
3A/419/RVD
GB/T 4728. 3--1998
IEC Introduction
This part of IEC617 forms a part of the series of graphic symbols for diagrams. This series consists of the following parts:
Part 1 General information, general index, comparison tablePart 2 Township
Symbol elements, qualifiers and other commonly used symbolsPart 3
Part 4
Part 5
Part 6
Part 7
Part 8
Part 9
Part 10
Part 11
Part 12
Part 13
Conductors and connectors
Basic passive components
Semiconductor tubes and electron tubes
Generation and conversion of electrical energy
Switchgear, control equipment and protection devices Measuring instruments, lamps and signaling devices
Telecommunications: switching and peripheral equipment
Telecommunications: transmission
Architectural and topographical installation plans and diagrams
Binary logic elements
Analog components
The scope and reference standards of this series are shown in IEC617-1. The above symbols are designed according to the requirements of ISO11714-1* to be published. The module used is M-2.5mm. To make the smaller symbols clearer, they are enlarged by one time in this standard and marked with "200%" in the symbol column; to save space, the larger symbols are reduced by one time and marked with "50%" in the symbol column. In order to facilitate the drawing of multiple terminals and meet other layout requirements, the size of the symbol (such as height) can be changed according to Article 7 of ISO11714-1. Regardless of whether the size of the symbol is enlarged, reduced or corrected, the original line width is not corrected proportionally.
The symbol layout of this standard should make the distance between the connecting lines a multiple of a certain module. In order to facilitate the marking of the terminal, 2M is usually selected. For ease of understanding, the symbols are drawn at a certain size, and the same grid is used uniformly when drawing all symbols. In the computer-aided drawing system, all symbols should be drawn within the grid, and the grid used is reproduced on the background of the symbol. The old symbols included in Appendix A of the first edition of IEC617-3 have a transition period. This part is no longer included in the second edition, and it will be made clear that they are no longer used.
The index to Annexes B and C consists of an alphabetical index of the names of symbols and their numbers, the names of which are based on the description of the symbols in this part. A general alphabetical index of symbols for all parts is given in IEC 617-1. *Currently, it is still in the draft international standard stage (Document 3/563/DIS) 31
Connecting wires
03-01-01
03-01-02
03-01-03
National Standard of the People's Republic of China
Graphical symbols for diagramsPart 3 Conductors and connecting devicesSymbols
Connecting wires, connections
Connecting wire groups
Eastern example:
Transmission paths
GB/T 4728. 3--1998
idt IEC 617-3:1996
Replaces GB4728.3--84
When a single line is used to represent a group of conductors, the number of conductors can be marked with a corresponding number of short slashes or a short slash followed by the number of conductors
The length of the connection symbol depends on the layout of the schematic diagram Form 1
Form 2
Approved by the State Administration of Technical Supervision on March 11, 199832
Three conductors
Additional information can be marked, such as:
Current type
Distribution system
Number of conductors
Each Cross-sectional area of conductor
Chemical symbol of conductor material
Mark the cross-sectional area after the conductor number and separate them with "×"
If the cross-sectional areas are different, use "+" to separate them
Implemented on 12/1/1998
03-01-04
03-01-05
03-01-06
03-01-07
03-01-08
03-01-09
03-01-10
2x120 mm2 Al
GB/T 4728. 31998
Examples:
DC circuit, 110V, two 120mm2 aluminium conductors 3/N~400/230V 50Hz
3x120mm2 + 1x50mm2
Two-phase circuit, 400/230V1), 50Hz, three 120mm2 conductors, one 50mm2 neutral conductor flexible connection
Shielded conductors
If several conductors are included in the same shield or cable, or twisted together, but the symbols of these conductors are mixed with other conductor symbols, the drawing method of 03-01-10 can be used
The symbols of cables, shields or twisted wires can be drawn above, below or beside the symbols of the mixed group of conductors. Use connected guide lines to point to each conductor to indicate that these conductors are in the same shield, cable or twisted wire group.
Twisted conductors
Show two
Use the rule of 03-01-07
Conductors in cable
Show three
Use the rule of 03-01-07
Example:
Five conductors, two of which pointed by arrows are in the same cable
1) The corresponding level in the national standard GB156-93 "Standard Voltage" is 380/220V. 33
03-01-11
03-01-12
03-01-13
03-01-14
03-01-15
Connections, terminals and branches
03-02-01
03-0202
03-02-03
03-02-05
03-02-06
Form 1
Form 2
Form 1
GB/T4728.3—1998
Coaxial pair
If the coaxial structure is no longer maintained, the tangent line is only drawn on one side of the coaxial
Example:||t t||Coaxial pair connected to terminal
Shielded coaxial pair
Terminal of wire or cable not connected
Terminal of wire or cable not connected, and has special insulation
Connection point
Terminal board
Terminal mark can be added
T-type connection
Add connection symbol to symbol 03-02-04Double connection of wires
03-02-07
03-02-08
03-02-09
03-02-10
03-02-11
03-02-12
03-02-13
Form 2
GB/T 4728.3—1998
Form 2 is only used when necessary in the design
Go to Appendix A: 03-A1-01
The common connection of a group of identical and repeated parallel circuits should be replaced by the total number of branches. This number is placed next to the connection symbol
See GB6988.2-1997-a group of mirror-symmetrical symbols indicates the scope of the branch
Concept explanation:
10 parallel and equal resistors
Go to Appendix A: 03-A1-02
Conductor transposition
Phase sequence change
Polarity reversal
Symbol For use in multiphase or DC power circuits
Conductors that can be marked for transposition
Example:
Phase sequence change
Neutral point
The point at which multiple conductors are connected together to form the neutral point of a multiphase system
03-02-14
03-02-15
03-02-16
03-02-17
Connecting parts
03-03-01
03-03-02
03-03-03
03-03-04
Shan deleted
GB/T 4728. 3--1998
Example:
Three-phase synchronous generator
Three-phase synchronous generator with windings led out at both ends of each phase, showing the external neutral point
Multi-line representation of symbol 03-02-14
Wire tap without cutting the wire
This symbol together with symbol 03-02-04 indicates that the short wire should be parallel to the symbol of the uncut wire. Connections requiring special tools
This symbol together with symbol 03-02-04 indicate
Female contact (of connector)
Single-line representation of the female end of a multi-contact connector||tt ||Go to Appendix A: 03-A2-01
Male contacts (of connectors)
Representation of the male end of a multi-contact connector using single-line representation
Go to Appendix A: 03-A2-02
03-03-05
03-03-06
03-03-07
03-03-08
03-03-09
03-03-10
03-03-11
03-03-12
03-03-13
GB/T 4728.3--1998
Plugs and sockets
The rules for applying symbols 03-03-01 and 03-03-03 are transferred to Appendix A: 03-A2-03
Plugs and sockets, multi-pole
Symbol for six female contacts and six male contacts represented by multiple lines
Plugs and sockets, multi-pole
Symbol for six female contacts and six male contacts represented by single lines
Connectors, fixed parts of assemblies
This symbol is used only when it is necessary to distinguish between the fixed and movable parts of connector assemblies
Connectors, movable parts of assemblies
The requirements for use are the same as those for 03-03-09
Mating connectors
This symbol Indicates that the plug end is fixed and the socket end is movable. The requirements for use are the same as 03-03-09
Telephone type plugs and jacks
This symbol shows two poles
The long pole of the plug symbol indicates the plug tip and the short pole is the plug
Telephone type plugs and jacks with disconnected contacts
This symbol shows three poles
The requirements for use are the same as 03-03-12
03-03-14
03-03-15
03-03-16
03-03-17
03-03-18
03-03-19
03-03-20
03-03-21
0 3-03-22
Form 1
Form 2
Cable assembly accessories
03-04-01
03-04-02
GB/T4728.3-—1998
Telephone type disconnected plug hole
Telephone type disconnected plug hole
Coaxial plugs and sockets
If the coaxial plug or socket is connected to the coaxial pair, the tangent should be extended in the corresponding direction
Butt connector
Connected connecting piece
Disconnected connecting piece
Plug and socket connectors such as U-shaped connection
Male-female
Male-male with socket
Cable sealing terminal End, indicating a three-core cable Cable sealing terminal, indicating three single-core cables Serial number
03-04-03
03-04-04
03-04-05
03-04-06
03-04-07
GB/T4728.3-1998
Straight-through junction box, indicating three wires: Multi-wire indication
Single-wire indication
Cable junction box, indicating three wires with T-type connection:
Multi-wire indication
Single-wire indication
Cable air-sealed bushing, indicating three cables The high-pressure side is the long side of the trapezoid, so keep the bushing air-sealed
GB/T 4728.31998
Appendix A
(Indicative Appendix)
Old Symbols (I)
The symbols in this appendix are in IEC617-3:1983 and adopted in the standard of GB4728.3--84, but are now cancelled. These symbols are shown in the table below for understanding the old diagram only. (The numbers in brackets in this appendix are the symbol numbers of GB4728.3-84) A
Connections, terminals and branches
03-A1-01
(03-02-15)
03-A1-02
(03-02-17)
Connectors
03-A2-01
(03-03-02)
03-A2-02
(03-03-04)
03-A2-03
(03·0306)
Appendix Record B
Direct connection of wires
Wire joints
The total number of similar connectors is noted near the common connection symbol. Example:
Multiple-connected single-stroke selector (indicating 10 contacts)
Socket (inner hole) or one pole of the socket
Plug (male head) or one pole of the plug
Plug and socket (male head and inner hole)
(Reminder Appendix)
Old symbols (II)
The symbols in this appendix are the non-IEC617-3:1983 parts of the GB4728.3-84 standard and have been cancelled. These symbols are shown in the table below for understanding the old diagram.
(The numbers in brackets in this appendix are the symbol numbers of GB4728.3-84)3—84 symbol number) A
Connections, terminals and branches
03-A1-01
(03-02-15)
03-A1-02
(03-02-17)
Connectors
03-A2-01
(03-03-02)
03-A2-02
(03-03-04)
03-A2-03
(03·0306)
Appendix B
Wires Direct connection
Wire joint
The total number of similar connectors is noted near the common connection symbol. Example:
Multiple-connected single-stroke selector (indicating 10 contacts)
Socket (inner hole) or one pole of the socket
Plug (male head) or one pole of the plug
Plug and socket (male head and inner hole)
(Reminder Appendix)
Old symbols (II)
The symbols in this appendix are the non-IEC617-3:1983 parts of the GB4728.3-84 standard and have been cancelled. These symbols are shown in the table below for understanding the old diagram.
(The numbers in brackets in this appendix are the symbol numbers of GB4728.3-84)3—84 symbol number) A
Connections, terminals and branches
03-A1-01
(03-02-15)
03-A1-02
(03-02-17)
Connectors
03-A2-01
(03-03-02)
03-A2-02
(03-03-04)
03-A2-03
(03·0306)
Appendix B
Wires Direct connection
Wire joint
The total number of similar connectors is noted near the common connection symbol. Example:
Multiple-connected single-stroke selector (indicating 10 contacts)
Socket (inner hole) or one pole of the socket
Plug (male head) or one pole of the plug
Plug and socket (male head and inner hole)
(Reminder Appendix)
Old symbols (II)
The symbols in this appendix are the non-IEC617-3:1983 parts of the GB4728.3-84 standard and have been cancelled. These symbols are shown in the table below for understanding the old diagram.
(The numbers in brackets in this appendix are the symbol numbers of GB4728.3-84)
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