GOST 50571.23-2000 (IEC 60364-7-704-89) UDC 696.6:006.354 Group E08 STATE STANDARD OF THE RUSSIAN FEDERATION Electrical installations of buildings Part 7: Requirements for special installations Section 704 Electrical construction sites Electrical installations of buildings. Part 7. Requirements for special installations or locations. Section 704. Construction and demolition site installations ACS 91.140.50 29.120.50 13,260 OKS 3402 Effective date 1/1/2002 Preface 1 to develop the All-Russian Research Institute for Electrification of Agriculture (VIESKh) and the All-Russian Research Institute of Standardization and Certification in Engineering (VNIINMASH) INTRODUCED Standardization Technical Committee TC 337 "Electrical installations of residential and public buildings" 2 adopted and put into operation the Decree of the State Standard of Russia on Dec. 18, 2000 № 374-Article 3 of this standard is the authentic text of the international standard IEC 60364-7-704-89 "Electrical installations of buildings. Part 7. Requirements for special installations. Section 704. Devices used in the construction and demolition "with additional requirements that take into account the needs of the country's economy was first introduced 4 Enter This standard is part of the state standards for electrical installations of buildings, developed based on the standards of the International Electrotechnical Commission IEC 364" Electrical installations of buildings. " It represents the authentic text of the international standard IEC 60364-7-704-89, 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. Numbering sections and paragraphs in this standard, except for sections 1-3, entirely consistent with the numbering of IEC standards. 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 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 of people in specialized units, particularly used on construction sites. In cases where the construction site is located in the countryside and is located near the existing livestock buildings (barns, piggeries, etc.), protection against electric shock should ensure electrical safety, not only people but also farm animals, including the removal elektropatologii cattle, ie . loss of productivity under the influence of a safe and life is very low voltages touch. It is intended to design, installation, commissioning and maintenance organizations of all forms of ownership. The requirements of this standard are mandatory. Requirements to accommodate the needs of the economy, in italics. 2 Normative references in this standard references to the following standards: GOST 14254-96 (IEC 529-89) Degrees of protection provided by enclosures (code IP) Standard 30331.2-95 (IEC 364-3-93) / GOST 50571.2-94 ( IEC 364-3-93) Electrical installations of buildings. Part 3. The main characteristics of GOST 50020.2-92 (IEC 621-2-87) Electrical installations for outdoor sites under heavy conditions (including open mining and quarrying). Part 2. General requirements for the protection of GOST 50020.3-92 (IEC 621-3-79) Electrical installations for outdoor sites under heavy conditions (including open mining and quarrying). Part 3. General requirements for electrical equipment and auxiliary equipment GOST 50571.14-96 (IEC 364-7-705-84) Electrical installations of buildings. Part 7. Requirements for special installations. Section 705. Electrical installations of agricultural and livestock premises 3 Definitions In this standard, the following terms: 3.1 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. 3.2 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". 3.3 to 1 kV electrical installation: electrical, rated voltage not exceeding 1 kV. 3.4 conductive parts: Part ability to conduct electrical current. 3.5 neutral conductive part (neutral conductor): Part of the electrical installations that can conduct electrical current, the potential for a normal operating condition is equal or close to zero, such as housing the transformer, switchgear cabinet, casing starter wire bonding system, PEN-conductor, etc. n. 3.6 exposed conductive parts: Affordable touch-neutral conductive part. 03.07 sided conductive parts: conductive part that is not part of the installation. 3.8 Conductor: Part is designed to conduct electrical current a certain value. 3.9 live parts: Explorer or conductive part intended to work under stress in normal operating mode of the installation. 10.3 Ground Fault: Accidental or intentional (eg, triggered shorting) the emergence of a conducting connection between a live current carrying parts and ground, or not insulated from the conducting part of the land. 3.11 touch voltage: The voltage between the two exposed conductive parts while touching them with a human or animal, as well as tension between the exposed conductive parts to which touches a person or animal, and place on the surface of the local land or carrying out the floor on which there is a person or animal . 3.12 expected touch voltage: Same as the touch voltage, but the assumption that a person or animal is missing. 3.13 step voltage: The voltage between two points on the surface of the local land or a conductive floor, located at 1 m distance from one another, with respect to humans, and 1,4 m - in relation to cattle, which is regarded as a step length person or as distance between the front and rear animals. 3.14 grounding system (grounding system): The sum of the substation grounding devices, exposed conductive parts of the consumer and the neutral conductor in electrical systems up to 1 kV. 3.15 Type of ground: The indicator on the ratio of neutral to ground the transformer in the substation and the exposed conductive parts of the consumer and device neutral conductor. Designation of types of earthing systems - according to GOST R 50571.2 30331.2/GOST. Distinguish TN-, TT-and IT-system, the first two of which are grounded at the transformer substation, and the third - in isolation. TN-system on the device neutral conductor, in turn, is divided into TN-S-, TN-C-and TN-CS-system. 3.16, neutral: Intentional electrical connection to a neutral conducting part (neutral conductor) in electrical systems up to 1 kV grounded neutral transformer at the substation. 3.17 neutral conductor (N-conductor): The conductor in electrical systems up to 1 kV, intended for single-phase power and power consumers connected to the grounded transformer at the substation. 3.18 protective conductor (PE-conductor): The conductor in electrical systems up to 1 kV, intended for security purposes and linking the exposed conductive parts of the consumer with a grounding device. 3.19 combined zero-worker and the protective conductor (PEN-conductor): The conductor in electrical systems up to 1 kV, which combines the functions of a zero-worker and protective conductors. 3.20 direct contact: Electric contact person or animal with hazardous live parts. 3.21 hazardous live parts: live parts, touching which, under certain conditions may cause an electric shock. 3.22 indirect contact: Electric contact person or animal with exposed conductive parts, found themselves at a dangerous voltage as a result of damage to the electrical insulation of live parts. 3.23 short: Accidental or intentional electrical contact between two or more conductive parts, which resulted in the difference in electrical potential between them is close to zero. 3.24 overcurrent: current, whose value exceeds the nominal value of the current circuit. 3.25 overcurrent protection device: switching devices, disconnecting the circuit in excess of the overcurrent circuit set point. 3.26 protective device (RCD): switchgear, NC circuit when current exceeds the leakage of the circuit set point (ie the differential current, ie, that portion of the total leakage current, which returned to power supply bypassing the switching device). 3.27 Electrical safety division chains: Branch circuits from each other by separating the transformer windings which are separated by a core, an additional one or reinforced insulation. 3.28 Extra Low Voltage (CNS): The voltage does not exceed values ??at which it is not dangerous to humans in areas with high-risk, high-risk and in outdoor settings. 3.29 system safe low voltage (system BSNN): The electrical system in electrical installations up to 1 kV, in which the voltage does not exceed the values ??of the CNS: - In normal operation, electrical, and - in the first insulation damage, including earth fault in other circuits. 3.30 The containment system of low voltage (system ZSNN): The electrical system in electrical systems up to 1 kV where the voltage does not exceed the values ??of the CNS: - In normal operation, electrical, and - in the first insulation fault, except for a ground fault in other circuits. 700.1 General requirements of Part 7 of this standard be changed, amended or share common requirements from other parts of a set of standards. Section numbers, paragraphs and subparagraphs in Part 7 of this standard in line with those in the complex standards GOST 50571. The absence of references to the chapter, section or paragraph indicates that the corresponding general requirements remain in effect. 704 plants used in the construction and demolition 704.1 Scope 704.1.1 Special requirements of this section are offered for temporary installations for: - construction of new buildings - the repair, reconstruction, extension or demolition of existing buildings - municipal engineering works - excavation work - other works of this kind. These requirements do not apply to electrical installations, requirements for which are set to GOST R 50020.2 and GOST R 50020.3, as well as other electrical installations that are used when working on open-cast mines. Parts of buildings, which are intended for reconstruction (extension, add, repair or demolition) shall be considered as building sites for the period of reconstruction and require the use of temporary installations. When reconstructing the administrative and public buildings (offices, meeting rooms, cafeterias, restaurants, dormitories, the station premises, storage rooms, toilets, etc.) must be the requirements of Part 6.1 of IEC 364 [1]. Note - In special cases, you must adhere to more stringent requirements of section 706, relating to restrictions on placement of electrical equipment. 704.1.5 on building sites are limited to fixed electrical nodes, consisting of a core control mechanism and the main instrument of protection (see 704.537). Installation in the power circuit are considered as mobile, except units collected in accordance with the requirements of 704.52. 704.3 Assessment of general characteristics of 704.313
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