Electrical circuit diagram GOST 2.709 89

19.10.2019

STATE STANDARD OF THE UNION OF THE SSR

SINGLE CAND STEM OF DESIGN DOCUMENTATION

OBOZVALUES CONDITIONAL WIRES
AND CONTACT CONNECTIONS
ELECTRICAL COMPONENTS,
EQUIPMENT AND CIRCUIT PARTS
IN ELECTRICAL DIAGRAM

GOST 2.709-89

(ST SEV 3754 -82 , ST SEV 6308 -88)

STATETH USSR COMMITTEE ON STANDARDS

Moscow

STATESTANDARD OF THE UNION OF THE SSR

Unified system of design documentation

DESIGNATION CONDITIONAL WIRES AND
ELECTRICAL CONTACT CONNECTIONS
ELEMENTS, EQUIPMENT AND AREAS
CIRCUITS IN ELECTRICAL CIRCUITS

Unified system of design documentation.
Conventions of wires and terminal connections of
electrical elements , equipment and subcircuits
circuit diagrams

GOST
2.709-89

(CTWithEV 3754-82,

CTCMEA 6308 -88)

Introduction date 01 .01 .90

This standard applies to electrical circuits products of all industries and construction and establishes symbols for wires and clamps electrical elements, devices, equipment, basic electrical elements (resistors, fuses, relays, transformers, rotating machines), motor control devices, power supply, grounding, connection to the housing, circuit sections in electrical circuits.

1. GENERAL PROVISIONS

eleven . This International Standard specifies the methods used to distinguish terminals, and general rules for their uniform designation. Note ie. The term "terminal designation" is used to designate conductive sections of a circuit and electrical elements intended for connection. 12 . A single notation can be applied by using computer science and transmission of information by teletype. thirteen . The drawings in this standard are given as examples to clarify the text.

2. METHODS OF DESIGNATION

2.1. An important criterion for choosing the method of labeling clamps is their function and location. The distinguishing features of the method marked and I are: 1) the location of the clamps according to the chosen system; 2) conditional color according to the chosen system; 3) conventional graphic designation according to GOST 2.721; 4) alphanumeric designation according to Sec. 4. Note. These methods are equivalent in terms of their use. It is allowed to use graphic symbols in accordance with GOST 2.721 instead of alphanumeric ones (see tables 1 and 2). 2.2. The choice of marking method depends on the type of device, the location of the terminals, and the complexity of the device or wiring. 2.3. Alphanumeric designations are used for complex devices and wiring and are convenient for teletype transmission.

3. USE OF NOTATION

3.1. To designate the terminals of electrical elements, a conditional color is used, the corresponding graphic or alphanumeric designation. 3.2. When marking terminals with a conventional color, the relationship of the color and the equivalent graphic or alphanumeric designation shall be shown in the accompanying documentation. 3.3. If the design of a particular element or device does not allow the designation of a clamp, then the accompanying documentation must show the relationship between the location of the clamp, equivalent graphic or alphanumeric designations, as well as the relative position of the clamps.

4. UNIFIED SYSTEM OF LETTER-NUMERIC DESIGNATIONS OF WIRES AND CLAMPS

4.1. When constructing letters of non-numeric designations, capital letters of the Latin alphabet and Arabic numerals are used. Letters I and O are not recommended. 4.2. The full designation consists of groups, each group - from letters and (or) numbers. It is allowed to omit one or more groups, if this does not lead to an error during connections. A period is used to separate groups consisting only of numbers or letters. If it is not necessary to distinguish subsequent groups, the dot can be omitted. For example, the full designation 1 U 11 can be written like this: 1 .11 if there is no need to indicate the group U ; if there is no need to distinguish subsequent groups, the dot can be omitted: 111 . 4.3. It is allowed to use the signs "+" and "-" when transmitting by teletype.

Notation principles

4.4. The following principles are observed in the designation system. The two end points of the elements are designated by consecutive numbers (for example, 1 and 2 in Fig. 1). Intermediate points of a simple element are preferably denoted by subsequent numbers (3, 4, 5, etc.). The numbering of intermediate points starts from the end point indicated by the lower number. For example, intermediate points of an element with end clamps 1 and 2 are indicated by the numbers 3, 4, 5 according to the drawing. 2.

4.5. When several identical elements are connected into groups, the ends of these elements are indicated in the following way: 1) letters (for example, U, V, W) are placed in front of the numbers according to clause 4.4 in accordance with the phases of the three-phase system (Fig. 3a); 2) before the figures according to clause 4.4, in the absence of the need or possibility of distinguishing between phases, the next figure is placed. For example, the ends of one element are marked 1.1 and 1.2, and the same ends of the next element - 2.1 and 2.2, if this does not lead to a change in designation 11, 12 and 21, 22 (Fig. 3b).

4.6. Identical groups of elements, the ends of which within these groups are assigned designations in accordance with clause 4.5, are distinguished by placing the serial numbers of groups in front of these designations by features. 4 .

Clamp code for elements direct current it is preferable to choose from the first half of the Latin alphabet, and for AC elements - from the second half of the alphabet. Note ie. An example of the use of alphanumeric designations of wires and clamps of a three-phase system is shown in Fig. 5.

The designations of the terminals of electrical devices connected to special wires are given in Table. one.

Table 1

Electrical connection terminal	Designation
Electrical connection terminal	alphanumeric	graphic
For AC
1st phase
2nd phase
3rd phase
neutral wire
Protective wire		According to GOST 2.721
Ground wire
Silent ground wire
Housing connection wire
Wire e to vipot entsialny

Terminals of electrical devices designed for direct or indirect connection to the supply wires of a three-phase system are preferably denoted by the letters U, V, W, if the phase sequence is necessary and possible. The clamp connected to the body is denoted by the letters MM, the clamp is equiv and potential - SS. This designation is used only when the connection of this terminal to the protective conductor or earth is not visible. 4.7. Designations of wires of a special type are given in table. 2.

table 2

Name	Designation
Name	alphanumeric	graphic
AC Power System:
phase wire
1st phase
2nd phase
3rd phase
neutral wire
DC Power System:
positive pole
negative pole
middle wire
Protective earth conductor		According to GOST 2.721
Protective conductor not earthed
Connected protective and medium conductor
Ground wire
Silent ground wire
About the connection to the housing
Wire e to vipotential

5. DESIGNATION OF CIRCUIT PARTS

5.1. The designation of circuit sections serves to identify them, can also reflect their functional purpose and creates a connection between the circuit and the device. 5.2. When designating, capital letters of the Latin alphabet and Arabic numerals are used, made in the same font size. 5.3. Sections of the circuit separated by contacts of devices, windings of machines, resistors and other elements must have a different designation. 5.4. Connections passing through non-separable, collapsible and detachable contact connections are designated the same. In justified cases, different designations are allowed. 5.5. Circuit sections in the circuit are designated regardless of the numbering in the input and output terminals of machines and devices. 5.6. The designation sequence should be, as a rule, from the input (power supply) to the consumer. Branching chains are designated from top to bottom in the direction from left to right. For convenient orientation in the diagrams, when designating sections of circuits, it is allowed to leave reserve numbers or skip some numbers. 5.7. The designation of the alternating current circuit consists of the designation of sections of the phase circuits and a sequential number. For example, sections of the circuit of the 1st phase - L 1, L 11, L 12, L 13, etc., 2nd phase - L 2, L 21, L 22, L 23, etc., 3 - th phase - L 3, L 31, L 32, L 33, etc. An example of the designation is shown in Fig. 6. It is allowed to abbreviate the designation according to clause 4.2. It is allowed, if this does not cause an erroneous connection, to designate the phases, respectively, with the letters A, B, C. 5.8. To distinguish phase or polarity wires related to different consumers, sequential numbers are used, which are placed before the designation of this phase or polarity (for example, the designation 2 L 1 means the wire of the first phase leading to the second consumer).

5.9. It is allowed to designate sections of the chain with consecutive numbers, as indicated in Fig. 7.

5.10. DC circuits are denoted by odd numbers in areas of positive polarity and even numbers in areas of negative polarity. The input and output sections of the circuit are designated with the indication of the polarity "L +" and "L -"; it is allowed to use only the signs "+" or "-" (Fig. 8).

5.11. It is allowed to include the designation of phases in the designation of control, protection, signaling, automation, measurement circuits (Fig. 9). In single-phase and two-phase AC circuits, it is allowed to designate sections of circuits with even and odd numbers. It is allowed to include in the circuit designation a designation characterizing the functional purpose of the circuit. In this case, the sequence of numbers is allowed to be set within the functional chain.

5.12. It is allowed to include in the designation of the circuits of a separate device included in the product, an uppercase letter of the Latin alphabet (except for A, B, C, M), chosen to designate the circuits of this device. In this case, the sequence of numbers is allowed to be set within the device. 5.13. On the diagram, the designation is put down near the ends or in the middle of the chain section: to the left of the chain image - with a vertical arrangement of the chain; above the image of the chain - with a horizontal arrangement of the chain. In technically justified cases, it is allowed to affix designations above the circuit image. 5.14. As a designation, the addresses of the connections of the chain section can be used. In this case, at the beginning of the section, the address of the connection of the end of the section is indicated, and at the end, the address of the connection of the beginning of the section. As addresses, alphanumeric designations of the element, device or functional group are used in accordance with GOST 2.710 (Fig. 10 and 11).

It is allowed to use a mixed designation, consisting of an indication of the circuit and connection addresses (Fig. 12).

INFORMATION DATA

1 . DEVELOPED AND INTRODUCED by the USSR State Committee for StandardsEXECUTEN ITELIS. S. Borush ek; V. V. Gugnina; B. Ya. Kabakov; B. S. Mendrikov; S. L. Taller; N. K. Tokareva; P. A. Shalaev, Ph.D. those xn. Sciences 2. APPROVED AND INTRODUCED BY Decree of the State Committee of the USSR on Standards dated March 24, 1989 No. 6693. The standard fully complies with ST SEV 3754-72, ST SEV 6308-884. Instead of GOST 2 .709-725. REFERENCESYOU

GOST 2.709-89

Group T52

INTERSTATE STANDARD

Unified system of design documentation

DESIGNATIONS CONDITIONAL WIRES AND CONTACT CONNECTIONS OF ELECTRIC ELEMENTS, EQUIPMENT AND CIRCUIT SECTIONS IN ELECTRICAL CIRCUITS

Unified system of design documentation. Conventions of wires and terminal connections of electrical elements, equipment and subcircuits in circuit diagrams

MKS 01.080.40
31.180
OKSTU 0002

Introduction date 1990-01-01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the USSR State Committee for Standards

DEVELOPERS

S.S. Borushek; V.V. Gugnina; B.Ya.Kabakov; B.S. Mendrikov; S.L. Taller; N.K.Tokareva; P.A. Shalaev, Ph.D. tech. Sciences

2. APPROVED AND INTRODUCED BY Decree of the USSR State Committee for Standards dated March 24, 1989 N 669

3. The standard fully complies with ST SEV 3754-72, ST SEV 6308-88

4. REPLACE GOST 2.709-72

5. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS


	Item number

6. REPUBLICATION. November 2007

This standard applies to electrical circuits of products in all industries and construction and establishes the symbols for wires and clamps of electrical elements, devices, equipment, basic electrical elements (resistors, fuses, relays, transformers, rotating machines), motor control devices, power supply, grounding, connections with the body, sections of circuits in electrical circuits.

1. GENERAL PROVISIONS

1.1. This International Standard specifies the methods used to distinguish terminals, as well as general rules for their uniform designation.

Note. The term "terminal designation" is used to designate conductive sections of the circuit and electrical elements intended for connection.

1.2. A single designation method can be used when using computer technology and transmitting information by teletype.

1.3. The drawings in this standard are given as examples to clarify the text.

2. METHODS OF DESIGNATION

2.1. An important criterion for choosing the way to designate clamps is their function and location.

The distinguishing features of the designation method are:

1) the location of the clamps according to the chosen system;

2) conditional color according to the chosen system;

3) conventional graphic designation according to GOST 2.721;

4) alphanumeric designation according to Section 4.

Note. These methods are equivalent in terms of their use.

It is allowed to use graphic symbols in accordance with GOST 2.721 instead of alphanumeric ones (see tables 1 and 2).

2.2. The choice of marking method depends on the type of device, the location of the terminals, and the complexity of the device or wiring.

2.3. Alphanumeric designations are used for complex devices and wiring and are convenient for teletype transmission.

3. USE OF NOTATION

3.1. To designate the clamps of electrical elements, a conditional color is used, the corresponding graphic or alphanumeric designation.

3.2. When marking terminals with a conditional color, the relationship of the color and the equivalent graphic or alphanumeric designation must be shown in the accompanying documentation.

3.3. If the design of a particular element or device does not allow the designation of a clamp, then the accompanying documentation must show the relationship between the location of the clamp, equivalent graphic or alphanumeric designations, as well as the relative position of the clamps.

4. UNIFIED SYSTEM OF LETTER-NUMERIC DESIGNATIONS OF WIRES AND CLAMPS

4.1. When constructing alphanumeric designations, capital letters of the Latin alphabet and Arabic numerals are used.

Letters I and O are not recommended.

4.2. The full designation consists of groups, each group - of letters and (or) numbers.

It is allowed to omit one or more groups, if this does not lead to an error during connections.

A period is used to separate groups consisting only of numbers or letters. If there is no need to distinguish subsequent groups, the dot can be omitted. For example, the full designation 1U11 can be written as follows: 1.11, if there is no need to indicate the group U; if there is no need to distinguish subsequent groups, the dot can be omitted: 111.

4.3. It is allowed to use the signs "+" and "-" when transmitting by teletype.

Notation principles

4.4. The designation system follows the following principles.

The two end points of the elements are designated by consecutive numbers (for example, 1 and 2 in Figure 1).

Intermediate points of a simple element are preferably denoted by subsequent numbers (3, 4, 5, etc.).

The numbering of intermediate points starts from the end point indicated by the lower number. For example, the intermediate points of the element with end clamps 1 and 2 are indicated by the numbers 3, 4, 5 according to drawing 2.

4.5. When several identical elements are combined into groups, the ends of these elements are indicated in the following way:

1) letters (for example, U, V, W) are placed before the numbers according to clause 4.4 in accordance with the phases of the three-phase system (Fig. 3a);

2) in front of the numbers according to clause 4.4, if there is no need or possibility of phase discrimination, the next number is placed. For example, the ends of one element are marked 1.1 and 1.2, and the same ends of the next element - 2.1 and 2.2, if this does not lead to a change in the designation 11, 12 and 21, 22 (Fig. 3b).

4.6. Identical groups of elements, the ends of which within these groups are assigned designations in accordance with clause 4.5, are distinguished by placing the serial numbers of the groups in front of these designations according to Fig.4.

The letter designation of the clamps for DC elements is preferably chosen from the first half of the Latin alphabet, and for AC elements - from the second half of the alphabet.

Note. An example of the use of alphanumeric designations of wires and clamps of a three-phase system is shown in Figure 5.

The designations of the terminals of electrical devices connected to special wires are given in Table 1.

Table 1


Connection clamp for electrical device	Designation
	alphanumeric	graphic
For AC:
1st phase
2nd phase
3rd phase
neutral wire
Protective wire
Ground wire
Silent ground wire
Body connection wire
Equipotential wire

Terminals of electrical devices designed for direct or indirect connection to the supply wires of a three-phase system are preferably marked with the letters U, V, W, if the phase sequence must be observed.

The clamp connected to the housing is designated by the letters MM, the equipotential clamp is CC. This designation is used only when the connection of this terminal to the protective conductor or earth is not visible.

4.7. Designations of wires of a special type are given in Table 2.

table 2


Name	Designation
	alphanumeric	graphic
AC power system:
phase wire
1st phase
2nd phase
3rd phase
neutral wire
DC Power System:
positive pole
negative pole
middle wire
Protective earth conductor
Protective conductor ungrounded
Connected protective and medium conductor
Ground wire
Silent ground wire
Body connection wire
Equipotential wire

5. DESIGNATION OF CIRCUIT PARTS

5.1. The designation of circuit sections serves to identify them, can reflect their functional purpose and creates a connection between the circuit and the device.

5.2. When designating, capital letters of the Latin alphabet and Arabic numerals are used, made in the same font size.

5.3. Sections of the circuit separated by contacts of devices, windings of machines, resistors and other elements must have a different designation.

5.4. Connections passing through non-separable, collapsible and detachable contact connections are designated the same. In justified cases, different designations are allowed.

5.5. Circuit sections in the circuit are designated regardless of the numbering of the input and output terminals of machines and devices.

5.6. The designation sequence should be, as a rule, from the input (power supply) to the consumer. Branching chains are designated from top to bottom in the direction from left to right.

For convenient orientation in the diagrams, when designating sections of circuits, it is allowed to leave reserve numbers or skip some numbers.

5.7. The designation of the alternating current circuit consists of the designation of sections of the phase circuits and a sequential number.


For example, chain sections	1st phase - L1, L11, L12, L13, etc.
	2nd phase - L2, L21, L22, L23, etc.
	3rd phase - L3, L31, L32, L33, etc.

An example of the designation is shown in Fig.6. It is allowed to abbreviate the designation according to clause 4.2.

It is allowed, if this does not cause an erroneous connection, to designate the phases, respectively, with the letters A, B, C.

5.8. To distinguish phase or polarity wires related to different consumers, sequential numbers are used, which are placed before the designation of this phase or polarity (for example, the designation 2L1 means the wire of the first phase leading to the second consumer).

5.9. It is allowed to designate sections of the chain with consecutive numbers, as indicated in Fig. 7.

5.10. DC circuits are denoted by odd numbers in areas of positive polarity and even numbers in areas of negative polarity. The input and output sections of the circuit are designated with the indication of the polarity "L +" and "L-"; it is allowed to use only the signs "+" and "-" (Fig. 8).

5.11. It is allowed to include the designation of phases in the designation of control, protection, signaling, automation, measurement circuits (Fig. 9).

In single-phase and two-phase non-power AC circuits, it is allowed to designate sections of circuits with even and odd numbers.

It is allowed to include in the circuit designation a designation characterizing the functional purpose of the circuit. In this case, the sequence of numbers is allowed to be set within the functional chain.

5.13. On the diagram, the designation is put down near the ends or in the middle of the chain section: to the left of the chain image - with a vertical arrangement of the chain; above the image of the chain - with a horizontal arrangement of the chain.

In technically justified cases, it is allowed to affix designations above the circuit image.

5.14. As a designation, the addresses of the connections of the circuit section can be used. In this case, at the beginning of the section, the address of the connection of the end of the section is indicated, and at the end, the address of the connection of the beginning of the section. As addresses, alphanumeric designations of the element, device or functional group are used in accordance with GOST 2.710 (Fig. 10 and 11).

It is allowed to use a mixed designation, consisting of an indication of the circuit and connection addresses (Fig. 12).

Electronic text of the document
prepared by CJSC "Kodeks" and checked against:
official publication
Unified design system
documentation: Sat. GOSTs. -
M.: Standartinform, 2008

STATE STANDARD

UNION SSR

UNIFIED SYSTEM OF DESIGN DOCUMENTATION

GOST 2.709 - 89

(ST SEV 3754 - 82, ST SEV 6308 - 88)

Official edition

USSR STATE COMMITTEE ON STANDARDS

UDC 621.332.35: 621.215.68: 006.354 Group T5J

STATE STANDARD OF THE UNION OF THE SSR

Unified system of design documentation

DESIGNATIONS CONDITIONAL WIRES AND CONTACT CONNECTIONS OF ELECTRIC ELEMENTS, EQUIPMENT AND CIRCUIT SECTIONS IN ELECTRICAL CIRCUITS

Unified system of design documentation. Conventions of wires and terminal connections of electrical elements, equipment and subcircuits in circuit diagrams

(CT SEV 3754-82, CT SEV 6308-88)

Date of introduction 01.01.90

This standard applies to electrical circuits of products in all industries and construction and establishes the symbols for wires and clamps of electrical elements, devices, equipment, basic electrical elements (resistors, fuses, relays, transformers, rotating machines), motor control devices, power supply, grounding, connections with the body, sections of circuits in electrical circuits.

1. GENERAL PROVISIONS

1.1. This International Standard specifies the methods used to distinguish terminals, as well as general rules for their uniform designation.

Note. The term "terminal designation" is used to designate conductive sections of the circuit and electrical elements intended for connection.

1.2. A single designation method can be used when using computer technology and transmitting information by teletype.

1.3. The drawings in this standard are given as examples to clarify the text.

Official Edition ★

2. METHODS OF DESIGNATION

2.1. An important criterion for choosing the way to designate clamps is their function and location.

The distinguishing features of the designation method are

1) the location of the clamps according to the chosen system;

2) conditional color according to the chosen system;

3) conventional graphic designation according to GOST 2.721;

4) alphanumeric designation according to Sec. 4.

Note. These methods in terms of their use** are equivalent.

It is allowed to use graphic symbols according to FOCT 2.721 instead of alphanumeric ones (see tables 1 and 2).

2.2. The choice of marking method depends on the type of device, the location of the terminals, and the complexity of the device or wiring.

2.3. Alphanumeric designations are used for complex devices and wiring and are convenient for teletype transmission.

3. USE OF SYMBOLS

3.1. To designate the clamps of electrical elements, a conditional color is used, the corresponding graphic or alphanumeric designation.

3.2. When marking terminals with a conditional color, the relationship of the color and the equivalent graphic or alphanumeric designation must be shown in the accompanying documentation.

3.3. If the design of a certain element or devices does not allow the designation of the clamp, then the accompanying documentation must show the relationship between the location of the clamp, equivalent graphic or alphanumeric designations, as well as the relative position of the clamps.

4. UNIFIED SYSTEM OF LETTER-NUMERIC DESIGNATIONS OF WIRES AND CLAMPS

4.1. When constructing alphanumeric designations, capital letters of the Latin alphabet and Arabic numerals are used.

4.2. The full designation consists of groups, each group - of letters and (or) numbers.

It is allowed to omit one or more groups, if this does not lead to an error during connections.

A period is used to separate groups consisting only of numbers or letters. If there is no need to distinguish between the following

groups, the dot can be omitted. For example, the full designation 1U11 can be written as follows: 1.11, if there is no need to indicate the group U; if there is no need to distinguish subsequent groups, the dot can be omitted: 111.

4.3. It is allowed to use the signs "+ e" and "-> when transmitting by teletype.

Notation principles

4.4. The designation system follows the following principles.

The two endpoints of elements are denoted in succession.

numbers (for example, 1 and 2 in Fig. 1).

Intermediate points of a simple element are preferably denoted by subsequent numbers (3, 4, 5, etc.).

The numbering of intermediate points starts from the end point indicated by the lower number. For example, the intermediate points of the element with end clamps 1 and 2 are indicated by the numbers 3, 4, 5 in Fig. 2.

4.5. When several identical elements are combined into groups, the ends of these elements are indicated in the following way:

1) letters (for example, U, V, W) are placed before the numbers according to clause 4.4 in accordance with the phases of the three-phase system (dev. For);

2) before the figures according to clause 4.4, if there is no need or the possibility of phase discrimination, the next figure is placed. For example, the ends of one element are marked 1.1 and 1.2, and the same ends of the next element are marked 2.1 and 2.2, if this does not lead to a change in the designation II, 12 and 21, 22 (Fig. 36).

GTH "HP

LX

.xxJ

and and and

4.6. Identical groups of elements, the ends of which within these groups are assigned designations in accordance with clause 4.5, are distinguished by placing serial numbers of groups in front of these designations by features. 4.

IL IVI /W) 2U1 2VI 7W

^ t:g "iY7l"?ll

IJ£x.!3L.J£x.-u

w? 1V2 1w? 2U2 in ?W2 Damn* 4

The letter designation of the clamps for DC elements is preferably chosen from the first half of the Latin alphabet, and for AC elements - from the second half of the alphabet.

Note. An example of the use of alphanumeric designations *wires and clamps of a three-phase system is shown in Fig. 5.

The designations of the terminals of electrical devices connected to special wires are given in Table. one.

Table 1

The clamp connected to the housing is designated by the letters MM, the equipotential clamp is CC. This designation is used only when the connection of this terminal to the protective conductor or earth is not visible.

4.7. Designations of wires of a special type are given in table. 2.

table 2

Continuation of the table. I

5. DESIGNATION OF CIRCUIT PARTS

5.1. The designation of circuit sections serves to identify them, can reflect their functional purpose and creates a connection between the circuit and the device.

5.2. When designating, capital letters of the Latin alphabet and Arabic numerals are used, made in the same font size.

5.3. Sections of the circuit separated by contacts of devices, windings of machines, resistors and other elements must have a different designation.

5.4. Connections passing through non-separable, collapsible and detachable contact connections are designated the same. In justified cases, different designations are allowed.

5.5. Circuit sections in the circuit are designated regardless of the numbering of the input and output terminals of machines and devices.

5.6. The designation sequence should be, as a rule, from the input (power supply) to the consumer. Branching chains are designated from top to bottom in the direction from left to right.

For convenient orientation in the diagrams, when designating sections of circuits, it is allowed to leave reserve numbers or skip some numbers.

5.7. The designation of the alternating current circuit consists of the designation of sections of the phase circuits and a sequential number.

For example, sections of the circuit of the 1st phase * -LI, Lll, L12, L13, etc.,

2nd phase - L2, L21, L22, L23, etc.,

3rd phase - L3, L31, L32, L33, etc.

An example of the designation is shown in Fig. 6. It is allowed to abbreviate the designation according to clause 4.2.

It is allowed, if this does not cause an erroneous connection, to designate the phases, respectively, with the letters A, B, C.

5.8. Sequential numbers are used to distinguish phase or polarity wires related to different consumers.

which are placed before the designation of a given phase or polarity (for example, the designation 2L1 means the wire of the first phase * leading to the second consumer).

5.9. It is allowed to designate sections of the chain with consecutive numbers, as indicated in Fig. 7.

5.10. DC circuits are denoted by odd numbers in areas of positive polarity and even numbers in areas of negative polarity. The input and output sections of the circuit are designated with the indication of the polarity "L-b" and "L-"; it is allowed to use only the signs "+" or "-" (Fig. 8).

5.11. It is allowed to include the designation of phases in the designation of control, protection, signaling, automation, measurement circuits (Fig. 9).

In single-phase and two-phase non-power AC circuits, it is allowed to designate sections of circuits with even and odd numbers.

It is allowed to include in the circuit designation a designation characterizing the functional purpose of the circuit. In this case, the sequence of numbers is allowed to be set within the functional chain.

5L2. It is allowed to include in the designation of the circuits of a separate device included in the product an uppercase letter of the Latin alphabet (except for A, B, C, M) chosen to designate the circuits of this device. In this case, the sequence of numbers can be set within the device.

5.13. On the diagram, the designation is put down near the ends or in the middle of the chain section: to the left of the chain image - when verti

chain location; above the image of the chain - with a horizontal arrangement of the chain.

In technically justified cases, it is allowed to affix designations above the circuit image.

It is allowed to use a mixed designation, consisting of an indication of the circuit and connection addresses (Fig. 12).

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the USSR State Committee for Standards

PERFORMERS

S. S. Borushek; V. V. Gugnina; B. Ya. Kabakov; B. S. Mendrikov; S. L. Taller; N. K. Tokareva; P. A. Shalaev, Ph.D. tech. Sciences

2. APPROVED AND PUT INTO EFFECT by the Decree of the USSR State Committee for Standards dated 24.03.89

3. The standard fully complies with ST SEV 3754-72, ST SEV

4. Instead of GOST 2.709-72

5. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS

Editor V. P. Ogurtsov Technical editor L. A. Nikitina Proofreader O. Yu. Afanasyeva,

Rented in emb. 05/15/89 Podl, in jech. 10.0S.89 0.75 st. oven l. 0.75 arb. kr.-ott. 0.60 ed. Tyr. 60 000 Price 3 k.

Order "Badge of Honor" Standards Publishing House, 123557, Moscow, GSP, Novopresnensky per., E Type. Moscow printer. Moscow, Lyalin per., 6. Zak. 609

STATE STANDARD OF THE UNION OF THE SSR

SINGLE CDESIGN DOCUMENTATION SYSTEM

OBOZCONDITIONAL WIRE VALUES
AND CONTACT CONNECTIONS
ELECTRICAL COMPONENTS,
EQUIPMENT AND CIRCUIT PARTS
IN ELECTRICAL DIAGRAM

GOST 2.709-89

(ST SEV 3754-82, ST SEV 6308-88)

STATETH USSR COMMITTEE ON STANDARDS

Moscow

STATESTANDARD OF THE UNION OF THE SSR

Unified system of design documentation

DESIGNATION CONDITIONAL WIRES AND
ELECTRICAL CONTACT CONNECTIONS
ELEMENTS, EQUIPMENT AND AREAS
CIRCUITS IN ELECTRICAL CIRCUITS

Unified system of design documentation.
Conventions of wires and terminal connections of
electrical elements, equipment and subcircuits
circuit diagrams

GOST
2.709-89

(CTWithEV 3754-82,

CTCMEA6308-88)

Introduction date01.01.90

1. GENERAL PROVISIONS

1.1. This International Standard specifies the methods used to distinguish terminals, as well as general rules for their uniform designation.

Note. The term "terminal designation" is used to designate conductive sections of the circuit and electrical elements intended for connection.

1.2. A single designation method can be used when using computer technology and transmitting information by teletype.

1.3. The drawings in this standard are given as examples to clarify the text.

2. METHODS OF DESIGNATION

The distinguishing features of the designation method are:

1) the location of the clamps according to the chosen system;

2) conditional color according to the chosen system;

3) conventional graphic designation according to GOST 2.721;

4) alphanumeric designation according to Sec. .

Note. These methods are equivalent in terms of their use.

It is allowed to use graphic symbols in accordance with GOST 2.721 instead of alphanumeric ones (see tables and).

2.2. The choice of marking method depends on the type of device, the location of the terminals, and the complexity of the device or wiring.

2.3. Alphanumeric designations are used for complex devices and wiring and are convenient for teletype transmission.

3. USE OF NOTATION

3.1. To designate the clamps of electrical elements, a conditional color is used, the corresponding graphic or alphanumeric designation.

3.2. When marking terminals with a conditional color, the relationship of the color and the equivalent graphic or alphanumeric designation must be shown in the accompanying documentation.

4. UNIFIED SYSTEM OF LETTER-NUMERIC DESIGNATIONS OF WIRES AND CLAMPS

4.1. When constructing alphanumeric designations, capital letters of the Latin alphabet and Arabic numerals are used.

It is allowed to omit one or more groups, if this does not lead to an error during connections.

A period is used to separate groups consisting only of numbers or letters. If there is no need to distinguish subsequent groups, the dot can be omitted. For example, the full designation 1U11 can be written as follows: 1.11, if there is no need to indicate the group U; if there is no need to distinguish subsequent groups, the dot can be omitted: 111.

4.3. It is allowed to use the signs "+" and "-" when transmitting by teletype.

Notation principles

The two end points of the elements are designated by consecutive numbers (for example, 1 and 2 in Fig.).

Intermediate points of a simple element are preferably denoted by subsequent numbers (3, 4, 5, etc.).

The letter designation of the clamps for DC elements is preferably chosen from the first half of the Latin alphabet, and for AC elements - from the second half of the alphabet.

Note. An example of the use of alphanumeric designations of wires and clamps of a three-phase system is shown in Fig. .

The designations of the terminals of electrical devices connected to special wires are given in Table. .