GOST 2.755-87 Unified system for design documentation. Graphical symbols in electrical circuits. Device switching and contact connections

GOST 2.755-87 UDC 744:621.3:003.62:006.354 Group T52 Interstate standard Unified system for design documentation Graphical symbols in electrical circuits SWITCHING DEVICE AND CONTACT LINKS Unified system for design documentation. Graphic designations in electric diagrams. Commutational devices and contact connections Effective date 01.01.1988 MEDIA INFORMATION 1. Developed and submitted the USSR State Committee on Standards DEVELOPERS PA Shalaev, SS Borushek, SL Tuller, JN Achkasov 2. Approved and put into effect by Decision of the USSR State Committee on Standards of 27.10.87 № 4033 3. The standard is fully consistent ST SEV 5720-86 4. INSTEAD GOST 2.738-68 (except subparagraph 7 of Table. 1) and GOST 2.755-74 5. REFERENCE normative and technical documents Designation NTD, which was referenced paragraph number GOST 2.721-74 GOST 2.756-76 Chapeau Chapeau 6. REVISED. October 2000 This standard applies to the scheme, carried out manually or by automated means, products of all industries and construction, and establishes a conditional graphical notation switchgear, contacts, and their elements. This standard does not conditional graphical notation for diagrams of railway signaling, interlocking and blocking. Conditional graphical notation of mechanical linkages, gears and accessories - GOST 2,721. Conditional graphical notation is often perceived electromechanical devices - according to GOST 2,756. Dimensions of individual conventional graphic symbols and the ratio of their elements are given in the appendix. 1. General rules for constructing symbols of contacts. 1.1. Switching devices on the schemes to be drawn in the position adopted for the primary, in which the starting system of contacts de-energized. 1.2. Contacts of switching devices are composed of mobile and stationary contact details. 1.3. For pictures of basic (basic) functional characteristics of switching devices use conventional graphic symbols contacts that are allowed to perform in a mirror image: 1) closing 2) NC 3) Switching 4) switching to a neutral central position of 1.4. To explain the principle of switching devices as necessary for their contact details of the qualifying portray characters that are listed in Table. 1. Table 1: Name Designation 1. Function of the contactor 2. Switch function 3. Disconnector function 4. The function switch-disconnector 5. Automatic operation 6. Function of track or limit switch 7. Momentary 8. Lack of self-return 9. Note arc control. Designations given in Secs. 4.1, 7-9 in this table are placed on the fixed contact details and refer to paragraphs. 5 and 6 - on the mobile contact details. 2. Examples of building designations contacts of switching devices are shown in Table. 2. Table 2: Name Designation 1. Contact switching devices: 1) switching without breaking the circuit (bridge) 2) with a double closure 3) with double-opening 2. Contact Pulse closing: 1) at operation 2) for the return of 3) for actuation and return 3. Contact Pulse NC: 1) at operation 2) for the return of 3) for actuation and return 4. Contact in the contact group, triggered earlier in relation to other contacts groups: 1) closing 2) NC 5. Contact in the contact group, triggered later in relation to other contacts groups: 1) closing 2) NC 6. Contact no self-return: 1) closing 2) NC 7. Contact momentary: 1) closing 2) NC 8. Changeover contact with neutral central position, with the momentary position of the left and without right of return of 9. Contact Contactor: 1) closing 2) NC 3) closing arcing 4) NC arcing 5) closing with automatic activation 10. Contact switch 11. Contact disconnector 12. Contact switch-disconnector 13. Contact the limit switch: 1) closing 2) NC 14. Contact sensitive to temperature (thermal contact): 1) closing 2) NC 15. Contacts close to the slowdown in force: 1) at operation 2) for the return of 3) for actuation and return 16. NC contact with the slowdown in force: 1) at operation 2) for the return of 3) at operation and return to the Note pp. 15 and 16. Retardation is moving in the direction of the arc to its center. 3. Examples of building designations contacts DIP switching devices are shown in Table. 3. Table 3: Name Designation 1. Contact closes the switch: 1) single-pole single line Multiline 2) three-pole 2. Contact the trailing three-pole circuit breaker with automatic tripping overcurrent 3. Contact closing push button switch with no self-return, with the opening and the return of control: 1) Automatic 2) through the secondary pressing 3) by pulling the button 4), through a separate drive (for example, pressing reset) 4. Disconnector-pole 5. Switch-disconnector-pole 6. Manual switch 7. Switch Solenoid (relay) 8. Switch terminal, with two separate chains 9. Note: self-contained thermal switch. Distinction should be made in the image of contact and contact thermostat depicted as follows 10. Inertia switch 11. Mercury switch trehkonechny 08.07.2008Stranitsy Published February 1 GOST on "Electrical, lighting, security systems," GOST 15597-82 Fixtures for industrial buildings. General specifications GOST 2.702-75 Unified system for design documentation. Rules for making electronic circuits with GOST 2.752-71 Unified system for design documentation. Graphical symbols in diagrams. Robot device GOST 2.756-76 * Unified system for design documentation. Graphical symbols in diagrams. Is often perceived electromechanical devices GOST 2.757-81 * Unified system for design documentation. Graphical symbols in diagrams. Elements of the switching field for switching systems GOST 2.758-81 Unified system for design documentation. Graphical symbols in diagrams. Signal Technology GOST 2.762-85 * Unified system for design documentation. Graphical symbols in electrical circuits. Frequencies and frequency bands for transmission systems GOST 2.763-85 * Unified system for design documentation. Graphical symbols in electrical circuits. Device with a pulse-code modulation GOST 2.764-86 Unified system for design documentation. Graphical symbols in electrical circuits. Integrated optoelectronic display elements GOST 2.768-90 Unified system for design documentation. Graphical symbols in diagrams.