GOST R IEC 60536-2-2001 Classification of electrical and electronic equipment in the way of protection against electric shock. Part 2.

GOST R IEC 60536-2-2001 UDC 621.3.002.5.001.33:006.354 Group E02 STATE STANDARD CLASSIFICATION OF RUSSIAN ELECTRICAL AND ELECTRONIC EQUIPMENT FOR THE METHOD OF PROTECTION FROM ELECTRIC SHOCK, Part 2: Guidelines for users to protect against electric shock Classification of electrical and electronic equipment with regard to protection against electric shock. Part 2. Guidelines to requirements for protection against electric shock ACS 29,020 31,020 OKP 34 0000 Effective date 7/1/2002 Preface 1 developed and submitted by the Technical Committee for Standardization TC 337 "Electrical installations of buildings", 2 adopted and put into operation the Decree Russian State Standard of December 24, 2001 . № 569-Article 3 of this Standard is a full authentic text of the International Standard IEC 60536-2-92 "Classification of electrical and electronic equipment in the way of protection against electric shock. Part 2. User Guide for the Protection against electric shock "4 first introduced Introduction This standard provides a practical application of the principles of protection against electric shock. Technical committees on standardization and developers of specific equipment can set specific or additional requirements that correspond to specific hardware. Technical standardization committees may consider applying this standard for equipment operating at higher voltage and higher frequency. The concept of this standard is based on two principles: 1) One must distinguish the following types of electrical hazards: - risk of contact with live parts when the person is simultaneously in contact with the ground potential or other live parts other than the potential (direct contact) - danger of contact to exposed conductive parts of electrical equipment, which is under stress due to damage to the insulation, when at this moment the person is in contact with the ground potential or another conducting part of an excellent building, for example, on the other exposed conductive parts, or a third party conducting part of the (indirect contact). Both types of risk correspond to the fundamental rule of protection against electric shock: dangerous live parts should be affordable and accessible conductive parts need not be dangerous in normal conditions and in the presence of faults. 2) Each component of the electrical equipment provided with the same kind of protection against electric shock, which is adopted for electrical installations in general. Protection against electric shock can be assured the environment by equipment, power system, or appropriate combinations of protective measures given in Table 1. Protection against indirect contact is ensured by the following measures: application of the basic protection that provides protection against electric shock, and the additional protection that provides protection against electric shock in case of failure of the main protection. Additional protection can be provided by appropriate design of equipment (class II) or measures that protect the installation setup (for both Class 0, I, III) or a special combination of these protective measures. For specific classes of equipment common combination of measures of protection against indirect contact are listed in Table 1. Basic and additional protection prevents damage human electrocution either: - reduce the value of current flowing through the human body to benign levels (as in class 0, II, III) or - reduce the time of passage of current through the human body so that there is no risk pathophysiological effects (class I). Table 1 - General combination of protective measures for indirect contact for hardware and electrical equipment Class Countermeasures equipment (item of the standard) for electrical installations (paragraph GOST 30331.3 / GOST R 50571.3) primary protection Extra protection Extra protection 0 Principal exclusion (5.2.1.1) - non-conductive (insulating) medium (413.3) Electrical separation circuits (safety division) - only one piece of equipment (413.5) I Basic insulation (5.2.2.1) The protective compound (5.2.2.2) Auto power off (no earth protective conductor plus protector (unit)) II Basic insulation (5.2.3.1.1) Additional insulation (5.2.3.1.2) - Reinforced insulation or equivalent constructive arrangement (5.2.3.1) III restriction stress (5.2.4.1) - Protective separation from other networks, except BSNN and ZSNN (411.1) 1 General Provisions 1.1 Scope This standard contains requirements that provide protection against electric shock by direct and indirect contact. Standard applies to electrical and electronic equipment (hereinafter - Equipment) with a rated voltage not exceeding 1000 V ac and rated frequency not exceeding 1000 Hz or 1500 VDC. 1.2 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 30331.3-95 (IEC 364-4-41-92) / GOST 50571.3- 95 (IEC 364-4-41-92) Electrical installations of buildings. Part 4. Security requirements. Protection against electric shock, GOST R IEC 536-94 Classification of electrical and electronic equipment in the way of protection against electric shock 2 Definitions In this standard is used terms and definitions of 2.1-2.6 GOST R IEC 536, as well as the following: 2.7 Protective connection: Electrical connections exposed conductive parts of equipment and / or protective shielding from the external protective conductor providing electrical continuity. 2.8 Protective shielding: Branch circuits and (or) conductors from hazardous live parts with a protective screen that is connected to a protective system that provides equalization capabilities designed to protect people from electrical shock. 2.9 Protective separation: Separation of one circuit from another method: - double insulation or - basic insulation and protective shielding, or - reinforced insulation. 3 Class of Class of equipment - according to GOST R IEC 536. 4 Measures of protection measures of protection against electric shock should be effective over the lifetime of the specific equipment. Note - The requirements for isolation of equipment - IEC 60664-1 [1]. 4.1 The protective compound 4.1.1 Available exposed conductive parts that may be dangerous voltage in case of damage (breakdown) of the main insulation as well as a protective device shielding, if any, should be attached to the protective devices connect directly to either: - through other exposed conductive parts - through individual guides - through the metal hull of the equipment - a combination of these methods. 4.1.2 protective device connection must withstand the maximum thermal and dynamic effects that can occur when current flows in equipment damage. 4.1.3 Protective connection must be low enough resistance to avoid a large potential difference between the individual pieces of equipment. 4.1.4 protective device connection must withstand the mechanical, thermal, impact and influence of the environment (including corrosion). 4.1.5 Movable conductive connections such as hinges and guides, should not be the only means of shielding the connections between pieces of equipment, if they do not meet the requirements of 4.1.2, 4.1.3, 4.1.4. 4.1.6 When removing detachable parts of the equipment chain protective equipment compounds should not be interrupted. 4.1.7 If the chain of protective compounds may be separated by means of plug-in connection, which disconnects all conductors feeding equipment, the protective conductor connection must be disconnected after disconnecting supply conductors. The supply conductors is unacceptable to connect to connect the protective conductor connection. This requirement does not apply to the case when the separation is allowed to conduct only when the power is off. 4.1.8 In the chain of protective compounds should not be disconnecting devices. 4.1.9 Insulated or bare wires protective compounds should vary in form, location, marking or color, except for those wires that can not be detached without destroying the metal braid or a similar switch on the rear panel or PCB mounting. If you use a color identification, then it should be designed as a green-yellow color combination. 4.2 Protective shielding separating conductive screen: There must be separated from each of the supply chain of basic insulation, the corresponding voltage of the circuit, must be connected to clamp protective conductor complying with the requirements for protective compounds in accordance with 4.1 shall withstand the maximum thermal and dynamic effects that may occur when current flows in equipment damage. 4.3 Protective separation Protective separation between fluids and other chains reach by: - ??double insulation (4.3.1) or - a protective shielding (4.3.2), or - a combination of these methods. 4.3.1 If the protective division provides double insulation or reinforced insulation, the insulation must comply with IEC 60664-1 [1]. If the wires are separate chains are held together with a conductor other chains in the stranded cable, or grouped in a different form, they must be isolated individually or in groups at highest voltage. 4.3.2 If the protective separation is achieved by protective shielding, the conductors of circuits must be separated in accordance with the requirements of 4.2. 4.3.3 If, for functional reasons need to connect any element between the separated chains, then this element must conform to the security restrictions of steady current and the energy of the charge referred to in 4.4. 4.4 The protective current limit and charge energy chains that are protected by the limitations of steady current and charge, must be separated from hazardous live parts in protective division. For functional reasons, they may be connected to hazardous live parts through the protective resistance, corresponding to the requirements of 4.4.1 or 4.4.2, and 4.4.3. 4.4.1 Device protective resistance of protective device must be securely resistance limits the current contact in the protected circuit in accordance with the requirements of 4.4.3 over the life of electrical equipment and withstand impacts identified for exclusion, which it bypasses. Protective device resistance can contain one or more elements, but in the event of any probable damage to one of the elements in accordance with 4.4.3 it should continue to limit the current touch-protected circuit. 4.4.2