GOST 50571.16-99 (IEC 60364-6-61-86) UDC 696.6:006.354 Group E08 STATE STANDARD OF THE RUSSIAN FEDERATION Electrical installations of buildings Part 6: TEST Chapter 61 Routine tests Electrical installations of buildings. Part 6. Verification. Chapter 61. Initial verification of ACS 27,020, 20,020 OKS 3402 Effective date 1/7/1999 Preface 1 developed by the JSC Company "Wiring" INTRODUCED Standardization Technical Committee TC 337 "Electrical installations of buildings" 2 approved and put into effect by Decision of Russian State Standard of April 28, 1999 № 149 3 This Standard contains the full authentic text of the International Standard IEC 60364-6-61 (1986) "Electrical installations of buildings. Part 6. Test. Chapter 61. Routine tests "with changes IEC № 1 (1993) and number 2 (1997) 4 first introduced Introduction This standard is based on IEC 60364-6-61-86 with additions that take into account specific conditions in Russia and the requirements of national regulatory Documentation (highlighted in the text of the standard in italics). The standard is part of a complex of national standards for electrical installations of buildings GOST 50571, developed on the basis of international standard IEC 60364 "Electrical installations of buildings". Therefore, it is stored in the accepted international standard for numbering sections and paragraphs. The requirements of this standard should be considered when developing and revising standards, rules and regulations for the design, installation, device, testing and commissioning of electrical installations of buildings. Scope of the standard - in accordance with GOST 50571.1-93 (part 1, section 1). The main re-introduced into this standard different from that existing in the national normative documents of the provisions are: 1 Selecting and testing of protective devices from electrical shock shall, at the largest allowable touch voltage - Upr.dop. This mainly reflects the physiological effects of electric current on the human body and provides better protection for him from the electric shock. 2 was recommended that a systematic approach to the implementation of tests as in volume and consistency of execution. 3 given in the standard methods and test methods are advisory in nature and can be replaced by others, but necessarily provide the required accuracy and reliability of the results of all test parameters and devices. In this standard, in some cases references to paragraphs and chapters of other standards set GOST 50571 without notation of specific standards. For example, in 612.5 of this standard provides a link to another item 413.3 standard set of GOST 50571. In accordance with the numbering system of parts, chapters, paragraphs in complex GOST 50571 specified in the link refers to paragraph 413.3 GOST 50571.3. This system of references to standards of GOST R 50571 complex also occurs in paragraphs 611.3, 612.4, 612.5, 612.6.1, 612.6.2, 612.6.3, and Table 61A. 1 Scope This Standard specifies requirements for the scope, procedures and methods for conducting acceptance tests, measurements and tests, compliance with which provides the required electrical and fire safety of electrical installations of buildings, public safety and service personnel, as well as reliable operation of electrical installations in their intended use, . Scope - GOST R 50571.1 (part 1, section 1). 2 Normative references in this standard references to the following standards: GOST 50571.1-93 (IEC 364-1-72, IEC 364-2-70) Electrical installations of buildings. Key provisions of GOST 50571.2-94 (IEC 364-3-93) Electrical installations of buildings. Part 3. The main characteristics of GOST 50571.3-94 (IEC 364-4-41-92) Electrical installations of buildings. Part 4. Security requirements. Protection against electric shock GOST 50571.4-94 (IEC 364-4-42-80) Electrical installations of buildings. Part 4. Security requirements. Protection against thermal effects GOST 50571.5-94 (IEC 364-4-43-77) Electrical installations of buildings. Part 4. Security requirements. Protection against overcurrent GOST 50571.7-94 (IEC 364-4-46-81) Electrical installations of buildings. Part 4. Security requirements. Branch, disable, control GOST 50571.10-96 (IEC 364-5-54-80) Electrical installations of buildings. Part 5. Selection and installation of electrical equipment. Chapter 54. Earthing and protective conductors GOST 50571.15-97 (IEC 364-5-52-93) Electrical installations of buildings. Part 5. Selection and installation of electrical equipment. Chapter 52. Wiring 61.1 General 61.1.1 Each electrical installation in the installation and / or after it, before putting into operation, should be inspected and tested to verify the extent possible, that the requirements set the standard GOST R 50571 are satisfied. 61.1.2 To carry out acceptance tests should be provided the necessary design documentation of the test electrical installation and the necessary factory documentation (certificates, manuals, etc.). 61.1.3 In the course of inspection and testing should be taken precautions to avoid danger to persons, damage to property and equipment installed. 61.1.4 If the expansion or reconstruction of existing electrical installations must ensure that its expansion or renovation complies with a set of standards GOST 50571 and does not reduce the safety of the existing part of the installation. 61.1.5 The tests shall be conducted by qualified personnel. 61.1.6 Upon completion of testing in accordance with 61.1.1 and 61.1.4 should be drawn. Note-The information on periodic tests are given in Appendix F. Information about the content of the protocol is given in Appendix G. 611 611.1 Visual inspection Visual inspection should be preceded by the test and is usually run at full off the installation. 611.2 Visual inspection is carried out to ensure that all permanently installed and connected electrical equipment: - meets the safety requirements and standards for equipment. Note-This can be found by inspection marking equipment or checking the availability of certificates at him - properly selected and installed in accordance with a set of standards GOST 50571 - no visible injuries, which reduce its safety. 611.3 Visual inspection should include at least the following checks: - protection against electric shock, including the measurement of distances, relating, for example, the protective guards or skin barrier or placing live parts out of reach (see 412.2-412.4, 413.3, Sections 471, 482, 527, chapter 43). Note-The requirement of 413.3, Protection by placing equipment in a non-conductive zone "is checked only in installations which include only permanently installed and connected equipment - availability of fire seals and other means of preventing the spread of fire, as well as protection from thermal effects (see Chapter 42) - the choice of conductors on the Long-term allowable current and voltage drop - the choice of security devices and alarm systems and their operation - having properly placed the isolating and separating the respective devices - the choice of equipment and protective measures, corresponding to external influences - the zero mark workers and protective conductors (see 514.3) - the availability of circuits, warning labels or other such information - Labelling of circuits, fuses, terminals, etc. - the correctness of the connection conductors - available for easy operation, identification and maintenance of electrical installations. 612 Tests 612.1 General provisions depending on the composition of the used measures of protection must meet the following test, measurement and testing, preferably in the above sequence: - test the continuity of protective conductors, including conductors, main and supplementary bonding systems (see 612.2) - resistance measurement electrical isolation (see 612.3) - security check through the separation of chains (see 612.4) - measurement of insulation resistance of floors and walls (see 612.5) - security check, the automatic shutdown of the power source (see 612.6) - check polarity (see 612.7) - test for dielectric strength (see 612.8) - performance testing (see 612.9) - to check on the thermal effects - check for voltage drop. If any test shows a discrepancy of this standard, then this test and each of the previous test, the results of which may influence this unsatisfactory test should be repeated after the fault. The test methods presented in this chapter are for reference only. Can be applied to other methods, if they give not less than reliable results. In particular, it can be applied depending on the performance of work methods of testing with resistance meters ground M416, F4103, measuring the short circuit current SCH41160, apparatus for controlling circuit resistance "phase-zero" M417, and the like. 612.2 Continuity of protective conductors, including main and supplementary bonding conductors, the system must be done to test continuity. It is recommended that this test was performed using a power source that has the open circuit voltage from 4 to 24 V DC or AC with a test current of at least 0.2 612.3 A. The insulation resistance electrical insulation resistance must be measured: a) between live conductors, taken by one of "two to two" to each other. NOTE-In practice, these measurements can be performed only during the installation of electrical appliances before accession; b) between each current carrying conductor and "earth". Notes 1 In TN-C PEN-conductor is considered as part of the land. " 2 During the testing phase and neutral conductor can be connected together. Table 61A - Minimum insulation resistance Voltage circuit, test voltage DC current, Insulation Resistance, Mohm Systems BSNN and functional low voltage (FSNN), where the network is powered by a secure separating transformer (411.1.2.1) and also fulfilled the requirements of 411.1. 3.3 250 ? 0,25 Up to 500 incl., except those BSNN and FSNN ? 0,5 500 500 1000 St. ? 1,0 insulation resistance, measured at the test voltage specified in Table 61A is considered satisfactory if each chain disconnected power consumers have the insulation resistance of not less than the appropriate value shown in Table 61A. Measurements should be performed at constant current. If the circuit has electronic devices, it should be measured insulation resistance between connected with phase and neutral conductor and earth. " Note - This precaution is necessary, since the execution of the test without the connection of current carrying conductors can cause damage to electronic devices. 612.4 Protection of division chains separation of live parts of one chain from other chains and the "land" in accordance with 411.1 and 413.5 shall be verified by measuring the insulation resistance. The obtained value of insulation resistance shall conform to table 61A. In this case, electrical appliances should be as much as possible, attached. 612.5 Resistance to the hearth and walls if necessary to meet the requirements of 413.3 insulating (nonconductive) premises, areas, sites of at least three measurements must be performed in each room. One of the measurements should be performed in approximately 1 m from the external conductive parts which are in this room. The other two measurements should be taken at greater distances. The above series of measurements must be made for each surface of the room. Annex A As an example, given a method for measuring the insulation resistance of floors and walls. 612.6 Verification of protection that provides automatic shutdown of power supply 612.6.1 General checking the effectiveness of protective measures against indirect contact by automatically disconnecting the power source is carried out as follows. a) For a system of TN Compliance with 413.1.3.3 shall be verified by: 1) measuring the resistance of the loop "phase-zero" (see 612.6.3). Notes 1 Correspondence can be confirmed by measuring the resistance of protective conductors in the conditions listed in Appendix E. 2 These measurements are not necessary if there are calculations of resistance loop "phase-zero" or resistance of protective conductors and when the electrical device allows you to check the length and cross section of the conductors. In this case, check the continuity of protective conductors (see § 612.2) is sufficient, and 2) test the performance of protective devices (ie, checking the current setting of circuit breakers and fuses fuse currents, as well as testing RCD). NOTE-Examples of test methods for UST given in Appendix B. In addition, the effective ground resistance Rb should be selected, where necessary, in accordance with 413.1.3.7. b) For a system TT Compliance with 413.1.4.2 shall be verified by: 1) measuring the resistance of earthing for the exposed conductive parts of electrical installations (see 612.6.2), 2) test the performance of protective devices. This check should be carried out for: - UST - the examinations and tests. NOTE-Examples of test methods for UST given in Appendix B - for overcurrent protective devices - visual inspection (ie, checking the current setting of circuit breakers, current fuse for fuse) - for protective conductors - checking their continuity (see 612.1 ). c) For a system of IT compliance with the requirements of 413.1.5.3 should be checked by calculating or measuring the current first ground fault. Notes 1 This measurement is not required if all exposed conductive parts connected to the electrical grounding system power supply (see 312.2.3) in the case when the system is connected to ground through a resistance (see 413.1.5.1). 2 measurements performed only if the account can not be done due to lack of options. This should be taken precautionary measures when performing measurements to avoid the danger of double-circuit to ground. Where there are conditions similar to conditions in the TT for the second circuit to ground (see 413.1.5.5a), checks are done in accordance with 612.6.1b. Where there are conditions similar to the conditions of TN (see 413.1.5.5b), perform the inspection in accordance with 612.6.1a. Note: When measuring the resistance-loop "phase-zero" is necessary to ensure the accession of a minor resistance between the neutral point system and the protective conductor at the connection point of the installation. 612.6.2 Measurement of resistance earthing earthing resistance measurement, where it is needed (see 413.1.4.2 for the TT system, 413.1.3.2 for a system of TN and 413.1.5.3 for the system IT) perform the appropriate method. Notes 1 Appendix C gives as an example, the description of the measurement method using two auxiliary electrodes zezemleniya. 2 If the location of the electrical system in the TT is (for example, in the city), which is virtually impossible to ensure that these two sub-electrode measurement of impedance (or resistance spreading) will give an inflated value. 612.6.3 Measurement of loop impedance "phase-zero" measured loop impedance "zero-phase" should be performed at a frequency equal to the nominal speed of the network. Note:-Methods for measuring loop impedance "phase-zero" are given as examples in Annex D. The measured impedance of the loop "zero-phase" must meet the requirements of 413.1.3.3 to 413.1.5.6 of TN and system IT. Note-If the value of loop impedance "zero-phase" could affect a significant current of earth fault, the results of measurements made at these currents in the factory or laboratory, with a current that satisfies the specified requirements, may be taken into account. This applies especially to complete devices prefabrication, including busbars, metal pipes and cables with metal shells. Where the requirements of this subparagraph are not met or if in doubt, and where to apply, in accordance with 413.1.6 additional adjustment capabilities, the effectiveness of this adjustment should be checked for compliance with the requirements of 413.1.6.2. 612.7 polarity test Where prohibited the installation of single-pole switch-off devices in the neutral conductor, polarity test should be performed to ensure that all such devices are included only in the phase conductor. 612.8 Testing dielectric strength 612.8.1 General test shall only equipment that is manufactured or upgraded on site. 612.9 Verifying Complete devices, such as switchboards and control panels, actuators, control systems and locking systems must be subjected to testing for performance, to make sure they are properly installed, adjusted and installed in accordance with the requirements of a set of standards GOST 50571. Protection devices should be subjected to testing for performance, if you want to check that they are properly installed and adjusted. NOTE-The methods of verification of RCD are given as examples in Appendix B. Appendix A (recommended) method of measuring insulation resistance of floor and wall as a source of DC megger use, providing the open circuit voltage to 500 V (or 1000 if the nominal voltage setting over 500). Resistance is measured between the measuring electrode and the protective conductor of the installation. Measuring electrodes can be one of the following types. In case of disagreement, it is recommended to use an electrode 1. Note-Testing is recommended that you to use on the subjects of the surface finishing coats (varnish, paint and other finishing materials). The measuring electrode 1 electrode consists of a square metal plate with a side of 250 mm square with a damp paper or water-absorbing material, from which excess moisture is removed, with a side of approximately 270 mm is placed between the metal plate and measured the surface. During the measurement, the plate is pressed against the surface of the floor or wall with a force of approximately 750 or 250 N, respectively. The measuring electrode 2 measuring electrode is a tripod, the legs of which form the vertices of an equilateral triangle (Figure A. 1). 1 - aluminum plate, 2 - screw with washer and nut, and 3 - Terminal 4 - the contact leg of the conductive rubber Figure A.1 - Test electrode 2 Each leg has a flexible basis, ensuring the load close contact with the measured surface area of ??approximately 900 mm2 and resistance of less than 5000 ohms. Before measuring the surface is moistened or covered with a damp cloth. During the measurements, a tripod is pressed to the floor or wall with a force equal to 750 or 250 N, respectively. APPENDIX B (recommended) Check the operation of UST Examples are the following methods Method 1 in Figure B.1 illustrates the principle of the method in which the adjustable resistor attached between a phase conductor on the load side and the exposed conductive parts. Current increases by decreasing the resistance of adjustable resistor RP. Current ID, which is triggered RCD must not be greater than the nominal current operation IDn. Note - This method can be used for systems TN-S, TT and IT. In the IT system may be a connection point of the scheme to the ground during the test required for the operation of UST. Method 2: Figure B.2 illustrates the principle of the method in which the adjustable resistor attached between one conductor (phase or zero workers) on the supply side and the other conductor (zero workers or phase) on the load side. Current increases by decreasing the resistance of adjustable resistor RP. Current ID, which UST work, must not be greater IDn. Load during the test shall be disconnected. NOTE-The method 2 may be used for systems TN-S, TT and IT. Figure C.1 - Diagram RCD testing the method 1 Figure B.2 - UST inspection scheme for Method 2 Method 3 Figure B.3 illustrates the principle of the method using an auxiliary electrode. Current increases by decreasing the resistance of adjustable resistor Rp. Figure B.3 - How to verify the method of UST 3 Then measure the voltage U between the exposed conductive parts and an independent auxiliary electrode. Measured as the current ID, which must not be greater IDn, where RCD trips. Must be satisfied the following condition (B.1) where UL-limiting normalizable touch voltage, V. Notes 1 Method 3 can only be used if the location of the electrical installation allows the use of an auxiliary electrode. 2 Method 3 can be used for systems TN-S, TT and IT. In the IT system may be necessary in testing the connection point of the system with the ground to ensure the operation of UST. APPENDIX C (recommended) Measurement of earthing resistance to measure the resistance of the earthing switch as an example can be taken the following method (Figure C.1). Alternating current is passed unchanged values ??between earthing T and the auxiliary electrode grounding T1, which is located at a distance to the zone of spreading of the two earth electrodes do not overlap. The second auxiliary electrode grounding T2, in which can be used a metal rod immersed in the land, should be placed between the T and T1. Then measure the voltage drop between the T and T2. Earthing resistance equal to the voltage between the T and T2, divided by the current flowing between the T and T1, provided that there is no overlapping spreading. To check that the earthing resistance is detected properly, spend two extra dimensions, in which the second auxiliary electrode T2 is transferred by 6 meters on and off at 6 meters closer to the T. If these three results do not differ significantly, their mean value taken for the earth resistance T. If there is a significant difference, the test is repeated with increasing distance between T and T1. If the test is performed on the AC power frequency, the internal resistance of the voltmeter should be less than 200 ohms / V. T-earthing is to be tested, disconnected from all power sources; T1 - subsidiary ground electrode; T2 - the second auxiliary grounding electrode; X-T2 modified provision for verification of measurement; Y-another variation of the position of T2 for the test measurement. Figure C.1 - Diagram of measurement of earthing
GOST 50571.16-99 (IEC 60364-6-61-86) UDC 696.6:006.354 Group E08 STATE STANDARD OF THE RUSSIAN FEDERATION Electrical installations of buildings Part 6: TEST Chapter 61 Routine tests Electrical installations of buildings. Part 6. Verification. Chapter 61. Initial verification of ACS 27,020, 20,020 OKS 3402 Effective date 1/7/1999 Preface 1 developed by the JSC Company "Wiring" INTRODUCED Standardization Technical Committee TC 337 "Electrical installations of buildings" 2 approved and put into effect by Decision of Russian State Standard of April 28, 1999 № 149 3 This Standard contains the full authentic text of the International Standard IEC 60364-6-61 (1986) "Electrical installations of buildings. Part 6. Test. Chapter 61. Routine tests "with changes IEC № 1 (1993) and number 2 (1997) 4 first introduced Introduction This standard is based on IEC 60364-6-61-86 with additions that take into account specific conditions in Russia and the requirements of national regulatory Documentation (highlighted in the text of the standard in italics). The standard is part of a complex of national standards for electrical installations of buildings GOST 50571, developed on the basis of international standard IEC 60364 "Electrical installations of buildings". Therefore, it is stored in the accepted international standard for numbering sections and paragraphs. The requirements of this standard should be considered when developing and revising standards, rules and regulations for the design, installation, device, testing and commissioning of electrical installations of buildings. Scope of the standard - in accordance with GOST 50571.1-93 (part 1, section 1). The main re-introduced into this standard different from that existing in the national normative documents of the provisions are: 1 Selecting and testing of protective devices from electrical shock shall, at the largest allowable touch voltage - Upr.dop. This mainly reflects the physiological effects of electric current on the human body and provides better protection for him from the electric shock. 2 was recommended that a systematic approach to the implementation of tests as in volume and consistency of execution. 3 given in the standard methods and test methods are advisory in nature and can be replaced by others, but necessarily provide the required accuracy and reliability of the results of all test parameters and devices. In this standard, in some cases references to paragraphs and chapters of other standards set GOST 50571 without notation of specific standards. For example, in 612.5 of this standard provides a link to another item 413.3 standard set of GOST 50571. In accordance with the numbering system of parts, chapters, paragraphs in complex GOST 50571 specified in the link refers to paragraph 413.3 GOST 50571.3. This system of references to standards of GOST R 50571 complex also occurs in paragraphs 611.3, 612.4, 612.5, 612.6.1, 612.6.2, 612.6.3, and Table 61A. 1 Scope This Standard specifies requirements for the scope, procedures and methods for conducting acceptance tests, measurements and tests, compliance with which provides the required electrical and fire safety of electrical installations of buildings, public safety and service personnel, as well as reliable operation of electrical installations in their intended use, . Scope - GOST R 50571.1 (part 1, section 1). 2 Normative references in this standard references to the following standards: GOST 50571.1-93 (IEC 364-1-72, IEC 364-2-70) Electrical installations of buildings. Key provisions of GOST 50571.2-94 (IEC 364-3-93) Electrical installations of buildings. Part 3. The main characteristics of GOST 50571.3-94 (IEC 364-4-41-92) Electrical installations of buildings. Part 4. Security requirements. Protection against electric shock GOST 50571.4-94 (IEC 364-4-42-80) Electrical installations of buildings. Part 4. Security requirements. Protection against thermal effects GOST 50571.5-94 (IEC 364-4-43-77) Electrical installations of buildings. Part 4. Security requirements. Protection against overcurrent GOST 50571.7-94 (IEC 364-4-46-81) Electrical installations of buildings. Part 4. Security requirements. Branch, disable, control GOST 50571.10-96 (IEC 364-5-54-80) Electrical installations of buildings. Part 5. Selection and installation of electrical equipment. Chapter 54. Earthing and protective conductors GOST 50571.15-97 (IEC 364-5-52-93) Electrical installations of buildings. Part 5. Selection and installation of electrical equipment. Chapter 52. Wiring 61.1 General 61.1.1 Each electrical installation in the installation and / or after it, before putting into operation, should be inspected and tested to verify the extent possible, that the requirements set the standard GOST R 50571 are satisfied. 61.1.2 To carry out acceptance tests should be provided the necessary design documentation of the test electrical installation and the necessary factory documentation (certificates, manuals, etc.). 61.1.3 In the course of inspection and testing should be taken precautions to avoid danger to persons, damage to property and equipment installed. 61.1.4 If the expansion or reconstruction of existing electrical installations must ensure that its expansion or renovation complies with a set of standards GOST 50571 and does not reduce the safety of the existing part of the installation. 61.1.5 The tests shall be conducted by qualified personnel. 61.1.6 Upon completion of testing in accordance with 61.1.1 and 61.1.4 should be drawn. Note-The information on periodic tests are given in Appendix F. Information about the content of the protocol is given in Appendix G. 611 611.1 Visual inspection Visual inspection should be preceded by the test and is usually run at full off the installation. 611.2 Visual inspection is carried out to ensure that all permanently installed and connected electrical equipment: - meets the safety requirements and standards for equipment. Note-This can be found by inspection marking equipment or checking the availability of certificates at him - properly selected and installed in accordance with a set of standards GOST 50571 - no visible injuries, which reduce its safety. 611.3 Visual inspection should include at least the following checks: - protection against electric shock, including the measurement of distances, relating, for example, the protective guards or skin barrier or placing live parts out of reach (see 412.2-412.4, 413.3, Sections 471, 482, 527, chapter 43). Note-The requirement of 413.3, Protection by placing equipment in a non-conductive zone "is checked only in installations which include only permanently installed and connected equipment - availability of fire seals and other means of preventing the spread of fire, as well as protection from thermal effects (see Chapter 42) - the choice of conductors on the Long-term allowable current and voltage drop - the choice of security devices and alarm systems and their operation - having properly placed the isolating and separating the respective devices - the choice of equipment and protective measures, corresponding to external influences - the zero mark workers and protective conductors (see 514.3) - the availability of circuits, warning labels or other such information - Labelling of circuits, fuses, terminals, etc. - the correctness of the connection conductors - available for easy operation, identification and maintenance of electrical installations. 612 Tests 612.1 General provisions depending on the composition of the used measures of protection must meet the following test, measurement and testing, preferably in the above sequence: - test the continuity of protective conductors, including conductors, main and supplementary bonding systems (see 612.2) - resistance measurement electrical isolation (see 612.3) - security check through the separation of chains (see 612.4) - measurement of insulation resistance of floors and walls (see 612.5) - security check, the automatic shutdown of the power source (see 612.6) - check polarity (see 612.7) - test for dielectric strength (see 612.8) - performance testing (see 612.9) - to check on the thermal effects - check for voltage drop. If any test shows a discrepancy of this standard, then this test and each of the previous test, the results of which may influence this unsatisfactory test should be repeated after the fault. The test methods presented in this chapter are for reference only. Can be applied to other methods, if they give not less than reliable results. In particular, it can be applied depending on the performance of work methods of testing with resistance meters ground M416, F4103, measuring the short circuit current SCH41160, apparatus for controlling circuit resistance "phase-zero" M417, and the like. 612.2 Continuity of protective conductors, including main and supplementary bonding conductors, the system must be done to test continuity. It is recommended that this test was performed using a power source that has the open circuit voltage from 4 to 24 V DC or AC with a test current of at least 0.2 612.3 A. The insulation resistance electrical insulation resistance must be measured: a) between live conductors, taken by one of "two to two" to each other. NOTE-In practice, these measurements can be performed only during the installation of electrical appliances before accession; b) between each current carrying conductor and "earth". Notes 1 In TN-C PEN-conductor is considered as part of the land. " 2 During the testing phase and neutral conductor can be connected together. Table 61A - Minimum insulation resistance Voltage circuit, test voltage DC current, Insulation Resistance, Mohm Systems BSNN and functional low voltage (FSNN), where the network is powered by a secure separating transformer (411.1.2.1) and also fulfilled the requirements of 411.1. 3.3 250 ? 0,25 Up to 500 incl., except those BSNN and FSNN ? 0,5 500 500 1000 St. ? 1,0 insulation resistance, measured at the test voltage specified in Table 61A is considered satisfactory if each chain disconnected power consumers have the insulation resistance of not less than the appropriate value shown in Table 61A. Measurements should be performed at constant current. If the circuit has electronic devices, it should be measured insulation resistance between connected with phase and neutral conductor and earth. " Note - This precaution is necessary, since the execution of the test without the connection of current carrying conductors can cause damage to electronic devices. 612.4 Protection of division chains separation of live parts of one chain from other chains and the "land" in accordance with 411.1 and 413.5 shall be verified by measuring the insulation resistance. The obtained value of insulation resistance shall conform to table 61A. In this case, electrical appliances should be as much as possible, attached. 612.5 Resistance to the hearth and walls if necessary to meet the requirements of 413.3 insulating (nonconductive) premises, areas, sites of at least three measurements must be performed in each room. One of the measurements should be performed in approximately 1 m from the external conductive parts which are in this room. The other two measurements should be taken at greater distances. The above series of measurements must be made for each surface of the room. Annex A As an example, given a method for measuring the insulation resistance of floors and walls. 612.6 Verification of protection that provides automatic shutdown of power supply 612.6.1 General checking the effectiveness of protective measures against indirect contact by automatically disconnecting the power source is carried out as follows. a) For a system of TN Compliance with 413.1.3.3 shall be verified by: 1) measuring the resistance of the loop "phase-zero" (see 612.6.3). Notes 1 Correspondence can be confirmed by measuring the resistance of protective conductors in the conditions listed in Appendix E. 2 These measurements are not necessary if there are calculations of resistance loop "phase-zero" or resistance of protective conductors and when the electrical device allows you to check the length and cross section of the conductors. In this case, check the continuity of protective conductors (see § 612.2) is sufficient, and 2) test the performance of protective devices (ie, checking the current setting of circuit breakers and fuses fuse currents, as well as testing RCD). NOTE-Examples of test methods for UST given in Appendix B. In addition, the effective ground resistance Rb should be selected, where necessary, in accordance with 413.1.3.7. b) For a system TT Compliance with 413.1.4.2 shall be verified by: 1) measuring the resistance of earthing for the exposed conductive parts of electrical installations (see 612.6.2), 2) test the performance of protective devices. This check should be carried out for: - UST - the examinations and tests. NOTE-Examples of test methods for UST given in Appendix B - for overcurrent protective devices - visual inspection (ie, checking the current setting of circuit breakers, current fuse for fuse) - for protective conductors - checking their continuity (see 612.1 ). c) For a system of IT compliance with the requirements of 413.1.5.3 should be checked by calculating or measuring the current first ground fault. Notes 1 This measurement is not required if all exposed conductive parts connected to the electrical grounding system power supply (see 312.2.3) in the case when the system is connected to ground through a resistance (see 413.1.5.1). 2 measurements performed only if the account can not be done due to lack of options. This should be taken precautionary measures when performing measurements to avoid the danger of double-circuit to ground. Where there are conditions similar to conditions in the TT for the second circuit to ground (see 413.1.5.5a), checks are done in accordance with 612.6.1b. Where there are conditions similar to the conditions of TN (see 413.1.5.5b), perform the inspection in accordance with 612.6.1a. Note: When measuring the resistance-loop "phase-zero" is necessary to ensure the accession of a minor resistance between the neutral point system and the protective conductor at the connection point of the installation. 612.6.2 Measurement of resistance earthing earthing resistance measurement, where it is needed (see 413.1.4.2 for the TT system, 413.1.3.2 for a system of TN and 413.1.5.3 for the system IT) perform the appropriate method. Notes 1 Appendix C gives as an example, the description of the measurement method using two auxiliary electrodes zezemleniya. 2 If the location of the electrical system in the TT is (for example, in the city), which is virtually impossible to ensure that these two sub-electrode measurement of impedance (or resistance spreading) will give an inflated value. 612.6.3 Measurement of loop impedance "phase-zero" measured loop impedance "zero-phase" should be performed at a frequency equal to the nominal speed of the network. Note:-Methods for measuring loop impedance "phase-zero" are given as examples in Annex D. The measured impedance of the loop "zero-phase" must meet the requirements of 413.1.3.3 to 413.1.5.6 of TN and system IT. Note-If the value of loop impedance "zero-phase" could affect a significant current of earth fault, the results of measurements made at these currents in the factory or laboratory, with a current that satisfies the specified requirements, may be taken into account. This applies especially to complete devices prefabrication, including busbars, metal pipes and cables with metal shells. Where the requirements of this subparagraph are not met or if in doubt, and where to apply, in accordance with 413.1.6 additional adjustment capabilities, the effectiveness of this adjustment should be checked for compliance with the requirements of 413.1.6.2. 612.7 polarity test Where prohibited the installation of single-pole switch-off devices in the neutral conductor, polarity test should be performed to ensure that all such devices are included only in the phase conductor. 612.8 Testing dielectric strength 612.8.1 General test shall only equipment that is manufactured or upgraded on site. 612.9 Verifying Complete devices, such as switchboards and control panels, actuators, control systems and locking systems must be subjected to testing for performance, to make sure they are properly installed, adjusted and installed in accordance with the requirements of a set of standards GOST 50571. Protection devices should be subjected to testing for performance, if you want to check that they are properly installed and adjusted. NOTE-The methods of verification of RCD are given as examples in Appendix B. Appendix A (recommended) method of measuring insulation resistance of floor and wall as a source of DC megger use, providing the open circuit voltage to 500 V (or 1000 if the nominal voltage setting over 500). Resistance is measured between the measuring electrode and the protective conductor of the installation. Measuring electrodes can be one of the following types. In case of disagreement, it is recommended to use an electrode 1. Note-Testing is recommended that you to use on the subjects of the surface finishing coats (varnish, paint and other finishing materials). The measuring electrode 1 electrode consists of a square metal plate with a side of 250 mm square with a damp paper or water-absorbing material, from which excess moisture is removed, with a side of approximately 270 mm is placed between the metal plate and measured the surface. During the measurement, the plate is pressed against the surface of the floor or wall with a force of approximately 750 or 250 N, respectively. The measuring electrode 2 measuring electrode is a tripod, the legs of which form the vertices of an equilateral triangle (Figure A. 1). 1 - aluminum plate, 2 - screw with washer and nut, and 3 - Terminal 4 - the contact leg of the conductive rubber Figure A.1 - Test electrode 2 Each leg has a flexible basis, ensuring the load close contact with the measured surface area of ??approximately 900 mm2 and resistance of less than 5000 ohms. Before measuring the surface is moistened or covered with a damp cloth. During the measurements, a tripod is pressed to the floor or wall with a force equal to 750 or 250 N, respectively. APPENDIX B (recommended) Check the operation of UST Examples are the following methods Method 1 in Figure B.1 illustrates the principle of the method in which the adjustable resistor attached between a phase conductor on the load side and the exposed conductive parts. Current increases by decreasing the resistance of adjustable resistor RP. Current ID, which is triggered RCD must not be greater than the nominal current operation IDn. Note - This method can be used for systems TN-S, TT and IT. In the IT system may be a connection point of the scheme to the ground during the test required for the operation of UST. Method 2: Figure B.2 illustrates the principle of the method in which the adjustable resistor attached between one conductor (phase or zero workers) on the supply side and the other conductor (zero workers or phase) on the load side. Current increases by decreasing the resistance of adjustable resistor RP. Current ID, which UST work, must not be greater IDn. Load during the test shall be disconnected. NOTE-The method 2 may be used for systems TN-S, TT and IT. Figure C.1 - Diagram RCD testing the method 1 Figure B.2 - UST inspection scheme for Method 2 Method 3 Figure B.3 illustrates the principle of the method using an auxiliary electrode. Current increases by decreasing the resistance of adjustable resistor Rp. Figure B.3 - How to verify the method of UST 3 Then measure the voltage U between the exposed conductive parts and an independent auxiliary electrode. Measured as the current ID, which must not be greater IDn, where RCD trips. Must be satisfied the following condition (B.1) where UL-limiting normalizable touch voltage, V. Notes 1 Method 3 can only be used if the location of the electrical installation allows the use of an auxiliary electrode. 2 Method 3 can be used for systems TN-S, TT and IT. In the IT system may be necessary in testing the connection point of the system with the ground to ensure the operation of UST. APPENDIX C (recommended) Measurement of earthing resistance to measure the resistance of the earthing switch as an example can be taken the following method (Figure C.1). Alternating current is passed unchanged values ??between earthing T and the auxiliary electrode grounding T1, which is located at a distance to the zone of spreading of the two earth electrodes do not overlap. The second auxiliary electrode grounding T2, in which can be used a metal rod immersed in the land, should be placed between the T and T1. Then measure the voltage drop between the T and T2. Earthing resistance equal to the voltage between the T and T2, divided by the current flowing between the T and T1, provided that there is no overlapping spreading. To check that the earthing resistance is detected properly, spend two extra dimensions, in which the second auxiliary electrode T2 is transferred by 6 meters on and off at 6 meters closer to the T. If these three results do not differ significantly, their mean value taken for the earth resistance T. If there is a significant difference, the test is repeated with increasing distance between T and T1. If the test is performed on the AC power frequency, the internal resistance of the voltmeter should be less than 200 ohms / V. T-earthing is to be tested, disconnected from all power sources; T1 - subsidiary ground electrode; T2 - the second auxiliary grounding electrode; X-T2 modified provision for verification of measurement; Y-another variation of the position of T2 for the test measurement. Figure C.1 - Diagram of measurement of earthing
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