This standard applies to the marking and labeling of terminals of electrical equipment such as resistors, fuses, relays, conductors, transformers, rotating machines and combinations of such equipment. In addition, this standard also applies to the marking of terminals of certain specific conductors. GB/T 4026-2004 Basic methods and safety rules for marking human-machine interfaces - General rules for the application of equipment terminals and specific conductor terminals and alphanumeric systems GB/T4026-2004 standard download decompression password: www.bzxz.net

GB/T 4026—2004/IEC 60445:1999 This standard is equivalent to IEC60445:1999 "Basic methods and safety rules for marking and identification of human-machine interfaces - General principles for the application of equipment terminals and specific wire terminal marking and alphanumeric systems" (3rd edition in English). This standard replaces GB/T4026-1992 "General rules for the identification and application of alphabetical mathematical systems for wiring terminals and specific wire terminals of electrical equipment"
Compared with GB/T4026-1992, this standard has the following major changes: the standard name has been changed in accordance with IEC60445:1993; (see cover, first page) some textual modifications have been made to the technical content of the retained part of GB/T4026-1992, striving to be concise and clear, and more in line with the original intention of the IEC publication;
The "basic safety publication" attribute of this standard and its relationship with other professional technical committees (see paragraphs 1 and 2 of Chapter 1 of this edition) have been added;
GB7947, IEC Guide 104 and ISO/ IEC Guide 51 and other 4 normative reference documents (see Chapter 2 of this edition); "In order to maintain consistency with the terminal markings of documents and equipment, it is recommended to use alphanumeric markings" (see the first paragraph of Chapter 3 of this edition) is added to Chapter 3.
---The article numbers of 5.1.1, 5.1, 2 and 5.1.3 of the 1992 edition are deleted while retaining the technical content, and the first paragraph of 5.1.2 is changed to a note;
---Figure 3 of the 1992 edition is deleted; other legend numbers are slightly changed; the project codes in the figures are re-marked in accordance with the rules of GB/T6988 "Preparation of Electrical Technical Documents" regarding the direction of the project codes and the direction of the lead wires; the lead wires of the middle terminals in Figures 2 and 4 are changed to lead out from the right side of the component; according to GB/T47 28 The graphic symbols in some legends have been changed (see Figure 5a, Figure 5b) and Figure 6) of this edition); - Three dashes have replaced a), b) and c) in 5.2.3 of the 1992 edition; a note has been added after the second dash: "For examples of clear terminal marking, see Appendix B of IEC61666"; "More detailed requirements for terminal marking and identification may be established by the relevant product committee" has been added after the third dash (see 5.2.3 of this edition); - The note of Article 5.2.4 of the 1992 edition has been changed to the main text of the article (see 5.2.4 of this edition); - Articles 5.3 and 5.4 of the 1992 edition have been merged into one article, and a note has been added (see 5.3 of this edition) The terminology and concept of IEC60050-195 - Functional grounding conductor (FE) has been introduced. ; For the protective conductor, PE is used regardless of whether it is grounded or not. According to this rule, the identification marks PU, E, TE, MM, CC, etc. of the ungrounded protective conductor, grounding conductor, low-noise grounding conductor, housing and rack connection, equipotential connection, etc. in the 1992 edition have been deleted; the identification marks PEN, PEM, PEI., PE and FB of PEN conductor, PEM conductor, PEL conductor, functional grounding conductor and functional equipotential bonding conductor have been added, and the graphic symbols of some terminals have been added; (see Table 1 of this edition) Appendix A has been added; to reflect the changes in the terminology and terminal identification marks between the old and new versions. Appendix A of this standard is an informative appendix. This standard was proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the Mechanical Science Research Institute. The responsible drafting unit of this standard: Mechanical Science Research Institute. Participating drafting units of this standard: the Third Electronic Research Institute of the Ministry of Information Industry, Wuxi Rixin Electric Motor Co., Ltd., and the 23rd Institute of China Aerospace Science and Industry Corporation. The main drafters of this standard: Li Shilin, Guo Ting, Zhao Xiaoying, Deng Ta, Li Ping. This standard replaces the previous versions of the standard: - GB4026-1983, GB/T4026-1992. 1
GB/T4026-2004/IEC60445:1999 Basic methods and safety rules for marking of human-machine interface terminals and specific conductor terminals General rules for the application of alphanumeric systems 1 Scope
This standard applies to the marking and marking of terminals such as resistors, fuses, relays, conductors, transformers, rotating machinery and combinations of such electrical equipment. In addition, this standard also applies to the marking of terminals of certain specific conductors. Technical committees may apply this basic safety publication when formulating standards in accordance with the principles established in IEC Guide 104 and ISO/IEC Guide 51.
It should be noted that one of the responsibilities of the technical committee is to include or refer to the requirements of the basic safety publication as much as possible when compiling standards applicable to a certain type of equipment.
2 Normative references
The provisions in the following documents become the provisions of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties that reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version is applicable to this standard. GB/T4728 (all parts) Graphic symbols for electrical schematics (GB/T4728.1--1985, idtIEC60617-1:1985GB/T 4728.2~4728.3-1998, GB/T 4728.4--1999, GB/T 4728.5~4728.8-2000, GB/T 4728.9 ~4728.10-1999, GB/T 4728.11-2000, idt IEC 60617-2~~60617-11:1996; GB/T 4728.12-1996, idtIEC60617-12:1991; GB/T4728.13--1996, idt IEC 60617-13:1993) GB/T 5465 (all parts) Graphic symbols for equipment (GB/T 5465.1-1996, eqv IEC 60416: 1988; GB/T 5465.2-1996 idt IEC 60417: 1994) GB 7947 Colour or numerical identification of conductors (idt IEC 60446: 1989) IEC 60050-195: 1998 International Electrotechnical Vocabulary (IEV) – Part 195: Earthing and protection against electric shock IEC Guide 104 Preparation of and basis for safety publications and use of group safety publications ISO/IEC Guide 51 Guide to standards containing safety features 3 Identification methods
Equipment terminals and specific conductor terminals may be identified by one or more of the following methods: - the actual or relative position of the equipment terminals or specific conductor terminals; - the colour code of the equipment terminals and specific conductor terminals; - the graphic symbols specified in GB/T 5465. If auxiliary symbols are required, they shall comply with the system alphanumeric marking specified in Chapter 5 of GB/T4728; Book 1. In order to maintain consistency in the marking of documents and equipment terminals, it is recommended to use alphanumeric marking. 4 Application of marking methods
The color, graphic symbol or alphanumeric marking used for identification shall be marked on the corresponding terminal or in its vicinity. When more than one identification method is used and confusion may occur, the relationship between the various identification methods shall be stated in the relevant documents. GB/T 4026-2004/IEC60445:19995 General rules for alphanumeric system
5.1 General
If letters and/or numbers are used in the marking, letters shall be uppercase Latin letters and numbers shall be Arabic numerals. Note: Letters for marking DC components are selected from the first half of the alphabet, and letters for marking AC components are selected from the second half of the alphabet. In order to avoid confusion with the numbers 1 and 0, the letters I and O should not be used; "+" and "_" can be used. Where there is no confusion, it is permitted to omit certain parts of the complete alphanumeric symbols specified in the following marking rules. 5.2 Marking rules
Terminal marking is based on the following rules:
5.2.1 The two side terminals of a single component are represented by two consecutive numbers, and the odd number should be smaller than the even number, for example, 1 and 2 (see Figure 1).
Figure 1 Single component with two terminals
5.2.2 The middle terminals of a single component are preferably distinguished by consecutive numbers. For example: 3, 4, 5, etc. The numbers of the middle terminals should be larger than the numbers of the two side terminals, and should be marked starting from the two side terminals with the smaller numbers, for example: the middle terminals of a component with two side terminals 1 and 2 are marked with the numbers 3 and 4 (see Figure 2). Figure 2 Single component with four terminals: two side terminals and two middle terminals 5.2.3 If several similar components are combined into a group, the terminals of each component should be marked in the following way: - Used in 5.2.1 and 5.2.The numbers specified in clause 2 are preceded by letters to distinguish the side terminals and the intermediate terminals, for example: U, V, W are used to mark the phase terminals of the corresponding equipment in a three-phase AC system (see Figure 3). Note: For examples of what are clear markings for equipment terminals, see the appendix of GB/T 18656. Q
Figure 3 Three-phase equipment with six terminals
-For applications where phase identification is not required or possible, the numbers specified in clauses 5.2.1 and 5.2.2 are preceded by numbers to distinguish the side terminals and the intermediate terminals. To avoid confusion, these numbers are separated by a dot, for example: the terminals of one component are marked with 1.1 and 1.2, and the terminals of another component are marked with 2.1 and 2.2 (see Figure 4). 2
GB/T 4026—2004/IEC 60445:1999 Figure 4 Three-component equipment with twelve terminals: six side terminals and six intermediate terminals When the terminal groups are marked with numbers, the numerical sequence is used. More detailed requirements for terminal marking and identification may be developed by the appropriate product committee. 5.2.4 When groups of similar components are marked with the same letter, they shall be distinguished by a number preceding the letter (see Figures 5a) and 5b)) os
Three-phase equipment with two groups of components
Figure 5a)
Figure 5b)
Two-phase equipment with two groups of components, each with four terminals Figure 6 shows an example of interconnection between equipment terminals and certain specified conductors marked with alphanumeric symbols. IPE1
Figure 6 Interconnection between equipment terminals and certain specified conductors 5.3 Marking of equipment terminals and terminals of specified conductors connected to specified conductors E2
Equipment terminals and terminals of specified conductors connected directly or indirectly to specified conductors shall be marked with the letters listed in Table 1. NOTE: Special markings not covered by this standard (e.g. protective equipotential bonding conductors where earthing is prohibited) may be subject to separate marking standards developed by the relevant technical committee.
GB/T4026--2004/IEC60445:1999 Table
Marking of equipment terminals connected to specific conductors and specific conductor terminals Specific conductors
AC conductor
1st line
2nd line
3rd line
Neutral conductor
DC conductor
Intermediate conductor
Protective conductor6
PEN conductor.
PEM conductor?
PEI conductor
Functional earthing conductor6
Functional equipotential bonding conductor.
See GB7947 color identification.
Marking of conductors and conductor terminals
See IEC60050-195 definition.
Protective conductor: (195-02-09)
PEN conductor: (195-02-12)
PEM conductor: (195-02-13)
PEL conductor: (195-02-14)
Functional earthing conductor: (195-01-13)
Functional equipotential bonding conductor: (195-01-16)Equipment terminal marking
Graphic symbol
cAccording to the provisions of IEC60050-195, equipotential bonding and rack or housing connection are no longer distinguished as before. Functional equipotential bonding conductors include both concepts.
Graphic symbol (5021 in GB/T5465--1996) is no longer used. The number after "L" is only required in systems with more than single phase. It is only required in systems with more than single phase. The following figures are the same as the symbols in GB/T5465: Symbol 5032 in GB/T5465
Symbol 5031 in GB/T5465
Symbol 5005 in GB/T5465
Symbol 5006 in GB/T5465
Symbol 5019 in GB/T5465
Symbol 5018 in GB/T5465
Symbol 5020 in GB/T5465
Identification of conductor terminals
Old symbols
Equipment terminals
The symbol is derived from GB/T5465.
Appendix A
(Informative Appendix)
Comparison of old and new symbols for equipment terminals and certain special conductors in GB/T4026-—2004/IEC60445:1999 New symbols
Special conductors
AC system power conductor
1st phase
2nd phase
3rd phase
Neutral conductor
DC system power conductor
Middle conductor
Protective conductor
PEN conductor
Grounding conductor
Low-noise grounding conductor
Chassis or rack connection
Equipotential bonding
Special conductors
AC conductor
1st line
2nd line||t t||Third line
Neutral conductor
DC conductor
Mid-point conductor
Protective conductor
PEN conductor
PEM conductor
PEL conductor
Functional earthing conductor
Functional equipotential bonding conductor
Functional equipotential bonding conductor
Conductor and conductor
Terminal identification
Equipment terminal marking
+\ or c
-“ or
GB/T4026--2004/IEC60445:1999 References
Identification of terminals in devices, equipment and industrial product systems (idtIEC61666:1997) GB/T18656—2002 Industrial system
See GB7947 color identification.
Conductor and conductor terminal identificationwww.bzxz.net
See IEC60050-195 definition.
Protective conductor: (195-02-09)
PEN conductor: (195-02-12)
PEM conductor: (195-02-13)
PEL conductor: (195-02-14)
Functional earthing conductor: (195-01-13)
Functional equipotential bonding conductor: (195-01-16)Equipment terminal marking
Graphic symbol
cAccording to the provisions of IEC60050-195, equipotential bonding and rack or housing connection are no longer distinguished as before. Functional equipotential bonding conductor includes both of the above concepts.
The graphic symbol (5021 in GB/T5465--1996) is no longer used. The number after "L" is only required in systems with more than single phase. The following figures are the same as the symbols in GB/T5465: Symbol 5032 in GB/T5465
Symbol 5031 in GB/T5465
Symbol 5005 in GB/T5465
Symbol 5006 in GB/T5465
Symbol 5019 in GB/T5465
Symbol 5018 in GB/T5465
Symbol 5020 in GB/T5465
Identification of conductor terminal
Old symbol
Equipment terminal
The symbol originates from GB/T5465.
Appendix A
(Informative Appendix)
Comparison of old and new symbols for equipment terminals and certain special conductors in GB/T4026-—2004/IEC60445:1999 New symbols
Special conductors
AC system power conductor
1st phase
2nd phase
3rd phase
Neutral conductor
DC system power conductor
Middle conductor
Protective conductor
PEN conductor
Grounding conductor
Low-noise grounding conductor
Chassis or rack connection
Equipotential bonding
Special conductors
AC conductor
1st line
2nd line||t t||Third line
Neutral conductor
DC conductor
Mid-point conductor
Protective conductor
PEN conductor
PEM conductor
PEL conductor
Functional earthing conductor
Functional equipotential bonding conductor
Functional equipotential bonding conductor
Conductor and conductor
Terminal identification
Equipment terminal marking
+\ or c
-“ or
GB/T4026--2004/IEC60445:1999 References
Identification of terminals in devices, equipment and industrial product systems (idtIEC61666:1997) GB/T18656—2002 Industrial system
See GB7947 color identification.
Conductor and conductor terminal identification
See IEC60050-195 definition.
Protective conductor: (195-02-09)
PEN conductor: (195-02-12)
PEM conductor: (195-02-13)
PEL conductor: (195-02-14)
Functional earthing conductor: (195-01-13)
Functional equipotential bonding conductor: (195-01-16)Equipment terminal marking
Graphic symbol
cAccording to the provisions of IEC60050-195, equipotential bonding and rack or housing connection are no longer distinguished as before. Functional equipotential bonding conductor includes both of the above concepts.
The graphic symbol (5021 in GB/T5465--1996) is no longer used. The number after "L" is only required in systems with more than single phase. The following figures are the same as the symbols in GB/T5465: Symbol 5032 in GB/T5465
Symbol 5031 in GB/T5465
Symbol 5005 in GB/T5465
Symbol 5006 in GB/T5465
Symbol 5019 in GB/T5465
Symbol 5018 in GB/T5465
Symbol 5020 in GB/T5465
Identification of conductor terminal
Old symbol
Equipment terminal
The symbol originates from GB/T5465.
Appendix A
(Informative Appendix)
Comparison of old and new symbols for equipment terminals and certain special conductors in GB/T4026-—2004/IEC60445:1999 New symbols
Special conductors
AC system power conductor
1st phase
2nd phase
3rd phase
Neutral conductor
DC system power conductor
Middle conductor
Protective conductor
PEN conductor
Grounding conductor
Low-noise grounding conductor
Chassis or rack connection
Equipotential bonding
Special conductors
AC conductor
1st line
2nd line||t t||Third line
Neutral conductor
DC conductor
Mid-point conductor
Protective conductor
PEN conductor
PEM conductor
PEL conductor
Functional earthing conductor
Functional equipotential bonding conductor
Functional equipotential bonding conductor
Conductor and conductor
Terminal identification
Equipment terminal marking
+\ or c
-“ or
GB/T4026--2004/IEC60445:1999 References
Identification of terminals in devices, equipment and industrial product systems (idtIEC61666:1997) GB/T18656—2002 Industrial system
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