GOST 50571.19-2000 (IEC 60364-4-443-95) UDC 696.6:006.354 Group E08 STATE STANDARD OF THE RUSSIAN FEDERATION Electrical installations of buildings Part 4: Protection for safety Chapter 44 Surge Protection Section 443 protection of electric lightning and switching OVERVOLTAGE Electrical installations of buildings. Part 4. Protection for safety. Chapter 44. Protection against overvoltages. Section 443. Protection against overvoltages of atmospheric origin or due to switching Effective date 01/01/2002 OKS OKS 3402 91.140.50 29.120.50 Preface 1 to develop the All-Russian Research Institute for Electrification of Agriculture (VIESKh) and the All-Russian Research Institute of Standardization and Certification Engineering (VNIINMASH), introduced by the Technical Committee for Standardization TC 337 "Electrical residential and public buildings" 2 adopted and put into operation the Decree of the State Standard of Russia on Dec. 18, 2000 № 377-article 3 of this standard is the authentic text of the international standard IEC 60364-4 -443-95 "Electrical installations of buildings. Part 4. Security requirements. Chapter 44. Surge protection. Section 443. Surge protection of atmospheric origin or due to switching "with additional requirements tailored to the needs of the economy. 4 Enter the first introduced by This standard is part of the state standards for electrical installations of buildings developed on the basis of the standards of the International Electrotechnical Commission IEC 364 "Electrical installations of buildings." It represents the authentic text of the international standard IEC 60364-4-443-95, except section 1, the qualifying features of this standard in the national energy Section 3, which eliminates ambiguity in the interpretation of terms and requirements (in italics) to reflect the needs of various industries economy, including agricultural production. The standard requirements are formulated to technical means to eliminate or reduce to an acceptable level of short-term (pulse) voltage surge that may occur in electrical systems up to 1 kV during thunderstorm activity or due to communications circuits with high inrush currents. Specified requirements correspond with the instructions set out in IEC 60664-1-92 [4] regarding the ability of the electrical insulation to withstand short-term surge of certain values ??for each of the four categories in the standard for power consumers. The numbering of chapters, paragraphs and subparagraphs of this standard, since section 443.2, corresponds to the numbering adopted in the IEC 60364-4-443-95. Requirements of the standard complement, modify or supersede the requirements of other private standards set state standards for electrical installations of buildings. The absence of references to the chapter, section or paragraph of the private standard means that the relevant requirements of the standard apply to this case. 1 (443.1) Scope This standard applies to electrical installations of buildings used in all sectors of the economy of the country irrespective of their belonging and ownership, and establishes requirements for electrical safety by protecting electrical installations from lightning and switching surges. With regard to agricultural production protection from lightning and switching surges shall provide recurring limitation in electrical transient voltage pulses to valid values, not only from the standpoint of protection from electrical accidents and outages, but also from the standpoint of ensuring electrical safety is very sensitive to the electric current farm animals including the removal of elektropatologii cattle, ie, loss of productivity under the influence of sound for the life of animals is very low voltages touch. It is intended to design, installation, commissioning and maintenance organizations of all forms of ownership. Requirements to complement the IEC 60364-4-443-95 and responsive to the needs of the economy, in italics. The requirements of this standard are mandatory. 2 (443.1.2) Statutory references in this standard references to the following standards: GOST 6433.3-71 Materials insulating solids. Methods for determining the electric strength at alternating (50 Hz) and constant voltage GOST 6581-75 insulating liquid material. Methods of electrical testing GOST 27427-87 (IEC 343-70) insulating materials. Methods for determining the relative resistance to breakdown by surface discharges GOST 27474-87 (IEC 587-84) insulating materials. Methods for testing the resistance of the formation of conductive bridges and erosion in the harsh environment of GOST 29322-92 (IEC 38-83) Standard voltage GOST 50571.18-2000 (IEC 364-4-442-93) Electrical installations of buildings. Part 4. Security requirements. Chapter 44. Surge protection. Section 442. Protection of electrical installations up to 1 kV surge caused by ground fault in electrical systems above 1 kV 3 Definitions In this standard, the following terms. 3.1 Dielectric strength: According to GOST 6581. 3.2 limit electrical insulation strength: According to GOST 6433.3. 3.3 Insulation resistance conductive education bridges and erosion: According to GOST 27474. 3.4 Insulation resistance breakdown of the surface discharge: According to GOST 27427. 3.5 Insulation resistance breakdown impulse voltage: The ability of electrical insulation to resist electrical breakdown of a pulsed voltage with certain parameters. 3.6 impulse withstand voltage: Short-term (pulse) voltage is a certain range of values, which must withstand the electrical insulation of equipment in this category. 3.7 Categories of impulse withstand voltage (overvoltage category): a subset (group) of numerical estimates of impulse voltage, characterized by their high value at which the electrical insulation of electrical equipment to withstand the recurrent surge voltage, provided that it is electrical equipment designed for the possibility of impulse voltage with such values . There are four categories of surge voltage-I, II, III and IV. 3.8 characteristic number of impulse withstand voltage: A numerical estimate impulse withstand voltage of the categories I-IV, which shows the expected level of stress. The greatest characteristic value indicates a higher value of voltage that can appear on the equipment during lightning or switching surges, and which must withstand electrical insulation equipment designed to work in this category stress (see table 44c). 3.9 Equipment pulsed resistance category X (equipment surge category X): Machinery, electrical insulation that can withstand surge voltage category X of the series I-IV (able to resist this stress). 3.10 Land (relative, reference): conductive and which is outside the zone of influence of any earthing of the earth's crust, the electric potential is assumed to be zero. 3.11 Local land: Part of the land, which is in contact with the grounding, the electric potential is influenced by current flowing from the earthing may be different from zero. In cases where the difference from zero potential of the land does not matter, instead of the term "local land" use the generic term "ground". 3.12 grounding: Intentional electrical connection of the points system or plant, or equipment to the local earth through the grounding device. 3.13 earthing device: A group of earthing and grounding conductors. 3.14 Earthing: Part of the grounding device, consisting of one or more electrically interconnected grounding electrodes. 3.15 electrically independent earthing (independent earthing): Grounding, located at a distance from other earthing that currents spreading from them have no significant effect on the electrical potential of the independent earthing. 3.16 grounding conductor: The conductor that connects the grounding point of the system or plant, or equipment grounding. 3.17 grounding electrode (earthing electrode): A conductive part which is in electrical contact with the local land, either directly or through an intermediate conductive medium, such as through a layer of concrete or conductive corrosion-resistant coating. 3.18 potentsialovyravnivayuschy electrode: Same as the ground electrode, but used to equalize electrical potential. 3.19 resistance grounding system: The ratio of voltage to the grounding device (relative to the earth) at ground systems or devices or equipment to the current flowing from the earthing to the ground, an equal amount of resistance grounding conductor and spreading resistance earthing. 3.20 earthing resistance spreading (spreading resistance earthing current into the ground): The ratio of stress at a point on the earthing in place of connection of grounding conductor (relative to the ground) to the current flowing from the earthing to the ground. 3.21 equalizing electrical potential: The electrical connection of conductive parts with each other to achieve their equipotential. 443.2 Classification of categories of impulse withstand voltage (overvoltage category) 443.2.1 The purpose of classification-Note: See Table 44c. Categories stress must be characterized by varying degrees of fitness equipment in terms of its long-term operation and risk tolerance failures. Select the level of impulse insulation equipment (resistance to surge) in relation to the entire electrical installation can be achieved by reducing the probability of equipment failure to a predetermined acceptable value, providing a framework for the management of impulsive overreach. The greatest characteristic value of the category of pulsed resistance indicates a higher specific impulse resistance equipment and makes possible a wider selection of management practices overvoltage. The notion of categories of pulse resistance is used for equipment that receives power from the main power supply. Note-Overvoltages atmospheric origin is unimportant physically weaken the processes taking place in most plants. Studies have shown that the concept of a probabilistic approach is justified and useful. 443.2.2 Description of categories of equipment Pulse Resistance (categories of equipment surge) impulse resistance equipment category I is designed for connection to existing electrical installations of buildings. Protective equipment placed outside the equipment or the existing installation, or between specific systems and equipment to limit short-term surge to a predetermined level. By Category II applies to equipment that will connect with existing electric facilities of buildings through the outlets and other similar connectors. NOTE-Examples of such equipment - household appliances, portable tools and similar others. The category III is equipment which is part of a specific electrical installation of the building where provided high degree of accessibility. Note - Examples of such equipment - switchboards, circuit breakers, mounting system (see IEC 60050 (826) [IEV 826-06-01] [1], including cables, junction boxes, switches, sockets) in the existing facility and equipment industrial applications, as well as other equipment such as stationary engines with pre-accession to the particular installation. Equipment pulsed resistance category IV is intended to be used near electrical installations of buildings before the main switchboard. NOTE-Examples of such equipment - electric meters, primary overcurrent protection devices and devices for controlling the overvoltage. 443.3 Arrangements for controlling overvoltage Notes 1 are not considered direct lightning strikes in the air line feeding the grids of up to 1 kV or electrical installations of buildings (the conditions of external influence AQ 3), see IEC 61024-1 [2]. 2 Managing the overpotential caused by switching action is not necessary in most cases, because the statistical evaluation showed that switching surges higher than the level of overvoltage category II, it is unlikely. If you want to install device surge protection in accordance with the instructions in this section, you must also abide by the terms section below. 443.3.1 443.3.1.1 If you want to control plant is powered entirely from the cable voltage up to 1 kV, and laid in the ground, and does not have an air line, it is sufficient surge voltage equipment in accordance with the table 44c, and no need for extra protection against overvoltages of atmospheric origin . Note-hanging cable, the armor is grounded, should be considered as cables in the ground. 443.3.1.2 If the unit is powered or contains an overhead line voltage up to 1 kV, and the condition of external influences AQ 1 (25 days per year) takes place, does not require additional protection against surges of atmospheric origin. Notes 1 Additional surge protection may be needed in cases where the expected high risk or high risk (eg, explosive or flammable areas). 2 According to the IEC 61024-1 [2] 25 thunderstorm days a year, equivalent to the value of the 2.24 average annual lightning strikes per 1 km2 of the earth's surface. It is derived from the formula where Ng - The average number of lightning strikes per 1 km 2 surface (the specific density of lightning strikes the ground); Td - the number of thunderstorm days per year. 3 In the Russian Federation in accordance with the Regulations for Electrical accepted classification of thunderstorms in the average duration of thunderstorms. Are seven areas of storm activity with an average duration of thunderstorms at least 10 hours, from 10 to 20 hours, from 20 to 40 hours, from 40 to 60 hours, from 60 to 80 hours, from 80 to 100 hours and more than 100h. 443.3.2 Protective management 443.3.2.1 When the installation is fed from an overhead line or include an external wire, overvoltage of atmospheric origin will be provided if the terrain, buildings and terrain match the level of external influences AQ 2 (more than 25 days per year). The level of the protective device will not be higher than the level of overvoltage category II, set out in table 44c. Notes 1 The level of surge protection devices can be controlled by voltage, placed before the installation (on entering the building) or on the supports of overhead lines, or directly in the building. 2, the Special protection may be required where necessary to ensure greater reliability or expected high risks (for example, in the explosion or fire risk), as well, and where the probability of failure of the installation should be small. 3 In the rural areas to protect from atmospheric surge of people in buildings and structures, overhead lines on wooden poles and voltage up to 1 kV, passing through open areas or in areas with one-storey buildings must have a grounding device with an impedance of 30 ohms. Earthing should be made at the supports, which depart entries into premises where there may be large numbers of people (schools, nurseries, kindergartens, hospitals, clubs, cinemas, etc.) or which are of great economic value (Livestock premises, warehouses, workshops, garages, etc.). 443.3.2.2 443.3.2.1 according to the conditions overvoltage of atmospheric origin can be provided in the electrical installation of buildings as follows: - impulse devices with protection category II according to IEC / DIS 60364-5-534 [3], or by other means, providing at least equivalent to the weakening of the surge. Note, is developing a guide to reconcile the pulsed conductor (gap). 443.4 Selection of equipment for electrical 443.4.1 The equipment must be chosen so that the rated impulse withstand voltage is not below the required impulse withstand voltage specified in table 44c. Duty IEC National Committees to require Rated impulse withstand voltage in units consistent with the value specified in Table 44c. Note-Rated impulse withstand voltage - is impulse withstand voltage, the manufacturer of the equipment or part thereof, which characterizes the ability of its specified insulation to resist surge (in accordance with 1.3.9.2 of IEC 60664-1 [4]). 443.4.2 The equipment has surge voltage below specifically listed in the table 44c can be used if the increased risk of damage is valid. Impulse protective devices and serial remedies will ensure the safety of the temporary surge in accordance with GOST R 50571.18. Part 1. Part 5. Selection and installation of electrical equipment. Part 1. 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 2.755-87 Unified system for design documentation. Graphical symbols in electrical circuits. Device switching and contact connections 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.
GOST 50571.19-2000 (IEC 60364-4-443-95) UDC 696.6:006.354 Group E08 STATE STANDARD OF THE RUSSIAN FEDERATION Electrical installations of buildings Part 4: Protection for safety Chapter 44 Surge Protection Section 443 protection of electric lightning and switching OVERVOLTAGE Electrical installations of buildings. Part 4. Protection for safety. Chapter 44. Protection against overvoltages. Section 443. Protection against overvoltages of atmospheric origin or due to switching Effective date 01/01/2002 OKS OKS 3402 91.140.50 29.120.50 Preface 1 to develop the All-Russian Research Institute for Electrification of Agriculture (VIESKh) and the All-Russian Research Institute of Standardization and Certification Engineering (VNIINMASH), introduced by the Technical Committee for Standardization TC 337 "Electrical residential and public buildings" 2 adopted and put into operation the Decree of the State Standard of Russia on Dec. 18, 2000 № 377-article 3 of this standard is the authentic text of the international standard IEC 60364-4 -443-95 "Electrical installations of buildings. Part 4. Security requirements. Chapter 44. Surge protection. Section 443. Surge protection of atmospheric origin or due to switching "with additional requirements tailored to the needs of the economy. 4 Enter the first introduced by This standard is part of the state standards for electrical installations of buildings developed on the basis of the standards of the International Electrotechnical Commission IEC 364 "Electrical installations of buildings." It represents the authentic text of the international standard IEC 60364-4-443-95, except section 1, the qualifying features of this standard in the national energy Section 3, which eliminates ambiguity in the interpretation of terms and requirements (in italics) to reflect the needs of various industries economy, including agricultural production. The standard requirements are formulated to technical means to eliminate or reduce to an acceptable level of short-term (pulse) voltage surge that may occur in electrical systems up to 1 kV during thunderstorm activity or due to communications circuits with high inrush currents. Specified requirements correspond with the instructions set out in IEC 60664-1-92 [4] regarding the ability of the electrical insulation to withstand short-term surge of certain values ??for each of the four categories in the standard for power consumers. The numbering of chapters, paragraphs and subparagraphs of this standard, since section 443.2, corresponds to the numbering adopted in the IEC 60364-4-443-95. Requirements of the standard complement, modify or supersede the requirements of other private standards set state standards for electrical installations of buildings. The absence of references to the chapter, section or paragraph of the private standard means that the relevant requirements of the standard apply to this case. 1 (443.1) Scope This standard applies to electrical installations of buildings used in all sectors of the economy of the country irrespective of their belonging and ownership, and establishes requirements for electrical safety by protecting electrical installations from lightning and switching surges. With regard to agricultural production protection from lightning and switching surges shall provide recurring limitation in electrical transient voltage pulses to valid values, not only from the standpoint of protection from electrical accidents and outages, but also from the standpoint of ensuring electrical safety is very sensitive to the electric current farm animals including the removal of elektropatologii cattle, ie, loss of productivity under the influence of sound for the life of animals is very low voltages touch. It is intended to design, installation, commissioning and maintenance organizations of all forms of ownership. Requirements to complement the IEC 60364-4-443-95 and responsive to the needs of the economy, in italics. The requirements of this standard are mandatory. 2 (443.1.2) Statutory references in this standard references to the following standards: GOST 6433.3-71 Materials insulating solids. Methods for determining the electric strength at alternating (50 Hz) and constant voltage GOST 6581-75 insulating liquid material. Methods of electrical testing GOST 27427-87 (IEC 343-70) insulating materials. Methods for determining the relative resistance to breakdown by surface discharges GOST 27474-87 (IEC 587-84) insulating materials. Methods for testing the resistance of the formation of conductive bridges and erosion in the harsh environment of GOST 29322-92 (IEC 38-83) Standard voltage GOST 50571.18-2000 (IEC 364-4-442-93) Electrical installations of buildings. Part 4. Security requirements. Chapter 44. Surge protection. Section 442. Protection of electrical installations up to 1 kV surge caused by ground fault in electrical systems above 1 kV 3 Definitions In this standard, the following terms. 3.1 Dielectric strength: According to GOST 6581. 3.2 limit electrical insulation strength: According to GOST 6433.3. 3.3 Insulation resistance conductive education bridges and erosion: According to GOST 27474. 3.4 Insulation resistance breakdown of the surface discharge: According to GOST 27427. 3.5 Insulation resistance breakdown impulse voltage: The ability of electrical insulation to resist electrical breakdown of a pulsed voltage with certain parameters. 3.6 impulse withstand voltage: Short-term (pulse) voltage is a certain range of values, which must withstand the electrical insulation of equipment in this category. 3.7 Categories of impulse withstand voltage (overvoltage category): a subset (group) of numerical estimates of impulse voltage, characterized by their high value at which the electrical insulation of electrical equipment to withstand the recurrent surge voltage, provided that it is electrical equipment designed for the possibility of impulse voltage with such values . There are four categories of surge voltage-I, II, III and IV. 3.8 characteristic number of impulse withstand voltage: A numerical estimate impulse withstand voltage of the categories I-IV, which shows the expected level of stress. The greatest characteristic value indicates a higher value of voltage that can appear on the equipment during lightning or switching surges, and which must withstand electrical insulation equipment designed to work in this category stress (see table 44c). 3.9 Equipment pulsed resistance category X (equipment surge category X): Machinery, electrical insulation that can withstand surge voltage category X of the series I-IV (able to resist this stress). 3.10 Land (relative, reference): conductive and which is outside the zone of influence of any earthing of the earth's crust, the electric potential is assumed to be zero. 3.11 Local land: Part of the land, which is in contact with the grounding, the electric potential is influenced by current flowing from the earthing may be different from zero. In cases where the difference from zero potential of the land does not matter, instead of the term "local land" use the generic term "ground". 3.12 grounding: Intentional electrical connection of the points system or plant, or equipment to the local earth through the grounding device. 3.13 earthing device: A group of earthing and grounding conductors. 3.14 Earthing: Part of the grounding device, consisting of one or more electrically interconnected grounding electrodes. 3.15 electrically independent earthing (independent earthing): Grounding, located at a distance from other earthing that currents spreading from them have no significant effect on the electrical potential of the independent earthing. 3.16 grounding conductor: The conductor that connects the grounding point of the system or plant, or equipment grounding. 3.17 grounding electrode (earthing electrode): A conductive part which is in electrical contact with the local land, either directly or through an intermediate conductive medium, such as through a layer of concrete or conductive corrosion-resistant coating. 3.18 potentsialovyravnivayuschy electrode: Same as the ground electrode, but used to equalize electrical potential. 3.19 resistance grounding system: The ratio of voltage to the grounding device (relative to the earth) at ground systems or devices or equipment to the current flowing from the earthing to the ground, an equal amount of resistance grounding conductor and spreading resistance earthing. 3.20 earthing resistance spreading (spreading resistance earthing current into the ground): The ratio of stress at a point on the earthing in place of connection of grounding conductor (relative to the ground) to the current flowing from the earthing to the ground. 3.21 equalizing electrical potential: The electrical connection of conductive parts with each other to achieve their equipotential. 443.2 Classification of categories of impulse withstand voltage (overvoltage category) 443.2.1 The purpose of classification-Note: See Table 44c. Categories stress must be characterized by varying degrees of fitness equipment in terms of its long-term operation and risk tolerance failures. Select the level of impulse insulation equipment (resistance to surge) in relation to the entire electrical installation can be achieved by reducing the probability of equipment failure to a predetermined acceptable value, providing a framework for the management of impulsive overreach. The greatest characteristic value of the category of pulsed resistance indicates a higher specific impulse resistance equipment and makes possible a wider selection of management practices overvoltage. The notion of categories of pulse resistance is used for equipment that receives power from the main power supply. Note-Overvoltages atmospheric origin is unimportant physically weaken the processes taking place in most plants. Studies have shown that the concept of a probabilistic approach is justified and useful. 443.2.2 Description of categories of equipment Pulse Resistance (categories of equipment surge) impulse resistance equipment category I is designed for connection to existing electrical installations of buildings. Protective equipment placed outside the equipment or the existing installation, or between specific systems and equipment to limit short-term surge to a predetermined level. By Category II applies to equipment that will connect with existing electric facilities of buildings through the outlets and other similar connectors. NOTE-Examples of such equipment - household appliances, portable tools and similar others. The category III is equipment which is part of a specific electrical installation of the building where provided high degree of accessibility. Note - Examples of such equipment - switchboards, circuit breakers, mounting system (see IEC 60050 (826) [IEV 826-06-01] [1], including cables, junction boxes, switches, sockets) in the existing facility and equipment industrial applications, as well as other equipment such as stationary engines with pre-accession to the particular installation. Equipment pulsed resistance category IV is intended to be used near electrical installations of buildings before the main switchboard. NOTE-Examples of such equipment - electric meters, primary overcurrent protection devices and devices for controlling the overvoltage. 443.3 Arrangements for controlling overvoltage Notes 1 are not considered direct lightning strikes in the air line feeding the grids of up to 1 kV or electrical installations of buildings (the conditions of external influence AQ 3), see IEC 61024-1 [2]. 2 Managing the overpotential caused by switching action is not necessary in most cases, because the statistical evaluation showed that switching surges higher than the level of overvoltage category II, it is unlikely. If you want to install device surge protection in accordance with the instructions in this section, you must also abide by the terms section below. 443.3.1 443.3.1.1 If you want to control plant is powered entirely from the cable voltage up to 1 kV, and laid in the ground, and does not have an air line, it is sufficient surge voltage equipment in accordance with the table 44c, and no need for extra protection against overvoltages of atmospheric origin . Note-hanging cable, the armor is grounded, should be considered as cables in the ground. 443.3.1.2 If the unit is powered or contains an overhead line voltage up to 1 kV, and the condition of external influences AQ 1 (25 days per year) takes place, does not require additional protection against surges of atmospheric origin. Notes 1 Additional surge protection may be needed in cases where the expected high risk or high risk (eg, explosive or flammable areas). 2 According to the IEC 61024-1 [2] 25 thunderstorm days a year, equivalent to the value of the 2.24 average annual lightning strikes per 1 km2 of the earth's surface. It is derived from the formula where Ng - The average number of lightning strikes per 1 km 2 surface (the specific density of lightning strikes the ground); Td - the number of thunderstorm days per year. 3 In the Russian Federation in accordance with the Regulations for Electrical accepted classification of thunderstorms in the average duration of thunderstorms. Are seven areas of storm activity with an average duration of thunderstorms at least 10 hours, from 10 to 20 hours, from 20 to 40 hours, from 40 to 60 hours, from 60 to 80 hours, from 80 to 100 hours and more than 100h. 443.3.2 Protective management 443.3.2.1 When the installation is fed from an overhead line or include an external wire, overvoltage of atmospheric origin will be provided if the terrain, buildings and terrain match the level of external influences AQ 2 (more than 25 days per year). The level of the protective device will not be higher than the level of overvoltage category II, set out in table 44c. Notes 1 The level of surge protection devices can be controlled by voltage, placed before the installation (on entering the building) or on the supports of overhead lines, or directly in the building. 2, the Special protection may be required where necessary to ensure greater reliability or expected high risks (for example, in the explosion or fire risk), as well, and where the probability of failure of the installation should be small. 3 In the rural areas to protect from atmospheric surge of people in buildings and structures, overhead lines on wooden poles and voltage up to 1 kV, passing through open areas or in areas with one-storey buildings must have a grounding device with an impedance of 30 ohms. Earthing should be made at the supports, which depart entries into premises where there may be large numbers of people (schools, nurseries, kindergartens, hospitals, clubs, cinemas, etc.) or which are of great economic value (Livestock premises, warehouses, workshops, garages, etc.). 443.3.2.2 443.3.2.1 according to the conditions overvoltage of atmospheric origin can be provided in the electrical installation of buildings as follows: - impulse devices with protection category II according to IEC / DIS 60364-5-534 [3], or by other means, providing at least equivalent to the weakening of the surge. Note, is developing a guide to reconcile the pulsed conductor (gap). 443.4 Selection of equipment for electrical 443.4.1 The equipment must be chosen so that the rated impulse withstand voltage is not below the required impulse withstand voltage specified in table 44c. Duty IEC National Committees to require Rated impulse withstand voltage in units consistent with the value specified in Table 44c. Note-Rated impulse withstand voltage - is impulse withstand voltage, the manufacturer of the equipment or part thereof, which characterizes the ability of its specified insulation to resist surge (in accordance with 1.3.9.2 of IEC 60664-1 [4]). 443.4.2 The equipment has surge voltage below specifically listed in the table 44c can be used if the increased risk of damage is valid. Impulse protective devices and serial remedies will ensure the safety of the temporary surge in accordance with GOST R 50571.18. Table 44c - Rated impulse withstand voltage required for equipment rated voltage installation * In Impulse test voltage, kV three-phase systems ** One-phase systems with an average point of the equipment installed before the switchgear (impulse resistance category IV) equipment installed inside buildings (impulse resistance category III) Portable Tools (Impulse resistance category II) Protective devices (impulse resistance category I) - 120-240 4,0 2,5 1,5 0,8 230/240 ** 277/480 ** - 6.0 4.0 2.5 1.5 400/690 - 8.0 6.0 4.0 2.5 1000 - The stresses determined in Systems Engineering * According to GOST 29322. ** In Canada and the United States for the stresses in excess of 300 with respect to ground, the value of the test voltage pulse is selected from the columns of the table corresponding to the higher voltage. Note - Category I is written for developers of special equipment, category II - Technical Committees related to the development and manufacture of electrical appliances and tools intended for use in electrical installations of buildings, Category III - the technical committees related to the development and manufacture of materials and installation of individual items of electrical equipment of buildings, Category IV - highly skilled engineers and system integrators. APPENDIX A (informative) Bibliography [1] IEC 60050 (826): 1990 International Electrotechnical Vocabulary (IEV). Chapter 826. Electrical installations of buildings [2] IEC 61024-1: 1990 Protecting facilities from lightning. Part 1. General principles [3] IEC / DIS 60364-5-534: 1997 Electrical installations of buildings. Part 5. Selection and installation of electrical equipment. Section 534. Surge protection devices [4] IEC 60664-1: 1992 Insulation coordination for equipment within low-voltage systems. Part 1. General requirements and test methods Keywords: electrical buildings, electrical installations up to 1 kV surge protection, lightning surge, switching surge, impulse voltage electrical content of 1 (443.1) Scope 2 (443.1.2) Normative references 3 Definitions 443.2 Classification categories impulse withstand voltage (overvoltage category) 443.2.1 443.2.2 Description The purpose of the classification categories of equipment Pulse Resistance (categories of equipment surge) 443.3 Arrangements for controlling overvoltage control 443.3.2 443.3.1 Required Safety Management 443.4 Selection of equipment for electrical Appendix A Bibliography. Posted on 07/19/2008 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 2.755-87 Unified system for design documentation. Graphical symbols in electrical circuits. Device switching and contact connections 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.
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