Please refer to this standard for details. GB 16895.5-2000 Electrical installations in buildings Part 4: Safety protection Chapter 43: Overcurrent protection GB16895.5-2000 Standard download decompression password: www.bzxz.net

GB 16B95.52000
This standard is equivalent to IEC60364-4-43:1977≤Electrical installations in buildings Part 4: Safety protection Chapter 43: Overcurrent protection" and its first amendment (1997). GB16895 "Electrical installations in buildings" is divided into the following 7 parts under the general title! Part 1: Scope, purpose and basic principles Part 2: Definitions
Part 3: Evaluation of general characteristics
Part 4: Safety protection
Part 5, Selection and installation of electrical equipment Part 6: Inspection
Part 7: Requirements for special installations or locations This standard is Chapter 43 in Part 4: Safety protection. Appendix A of this standard (Correspondence between the referenced standards in IEC60364-4-43 and the Chinese standards adopting these standards) is a prompt appendix.
This standard is proposed by the State Bureau of Machinery Industry. This standard is under the jurisdiction of the National Technical Committee for Standardization of Electrical Installations in Buildings. The drafting unit of this standard is China Machinery and Electronics Design Institute. The main drafters of this standard are Fan Gending, He Xiangkun and Huang Baosheng. This standard is entrusted to China Machinery and Electronics Design Institute for interpretation. GB16895.5-2000
IEC Foreword
1) Formal resolutions or agreements on technical issues related to FC are formulated by technical committees composed of national committees that are particularly concerned about these issues, and express international consensus on the issues involved as much as possible. 2) These resolutions or agreements are used internationally in the form of standards and are accepted by various national committees in this sense. 3) In order to promote international unification, IEC hopes that all national committees will adopt IEC standards in their respective national regulations under the conditions permitted by their domestic conditions. If there are any inconsistencies between IEC standards and corresponding national regulations, they should be clearly pointed out in the national regulations as much as possible.
IEC Foreword
This standard was formulated by IEC Technical Committee No. 64 (Electrical Equipment in Buildings). The draft of this standard was discussed at the Bucharest Conference in 1974 and the Toronto Conference in 1976. According to the results of the latter conference, the draft, document 64 (Central Office) 49, was submitted to the National Committees for voting in August 1976 in accordance with the "six-month rule". The National Committees of the following countries voted explicitly in favor of publication: Australia
Canada
Hungary
Israel
Italy
Portugal
Rounisia
South Africa (Republic)
Spain
Turkey
Other IEC publications cited in this standard are 12]: 60269-1 Low-voltage fuses Part 1: Basic requirements Adoption instructions,
I] The following IEC publications are also cited in this standard Standard: 60364-4-47; 1981 Electrical installations in buildings Part 4: Safety protection Chapter 47: Application of safety protection measures 60364-4-473: 1977 Electrical installations in buildings Part 4: Safety protection Chapter 47: Application of safety protection measures Section 473, Overcurrent protection measures
60364-5-523: 1983 Electrical installations in buildings Part 5: Selection and installation of electrical equipment Chapter 52 Wiring system Section 523, Current carrying capacity 60947-4-1: 1990 Low-voltage switchgear and control equipment Part 4 Contactors and motor starters Chapter 1, Electromechanical contactors and motor starters
2] The correspondence between the [EC standards cited in this standard and the Chinese standards that adopt these standards is shown in Appendix A. GB 16895- 5—2000
60269-2 Low-voltage fuses Part 2: Supplementary requirements for fuses used by professional personnel (mainly for industrial use) 60269-3 Low-voltage fuses Part 3: Supplementary requirements for fuses used by unskilled personnel (mainly for household and similar purposes)
60724:1984 Guidelines for short-circuit current temperature limitation of cables with rated voltage not exceeding 0.6/1.0 kV 60898:1995 Electrical accessories Overcurrent protection circuit breakers for household and similar purposes 60947-2,1995 Low-voltage switchgear and controlgear Part 2: Circuit breakers 61009 Household and similar purposes Residual current operated circuit breakers with overcurrent protection (RCBO'S) EC Amendment Document No. 1 Preface
This amendment was proposed by IEC Technical Committee 64 (Electrical Installations in Buildings). The text of this standard is based on the following documents: FDIS
64/904/FDIS
Voting Report
64/950/RVD
All information on the voting for this amendment can be found in the voting report mentioned in the table above. National Standard of the People's Republic of China
Electrical Installations in Buildings Part 4: Safety Protection Chapter 43: Overcurrent Protection
Electrical installations of bulldings-Part 4 :Protection for safety-Chapter 43. Protection against overcurrent431 General
GB16895.5—2000
idt IEC 60364-4-43:1977
Live conductors shall be protected by one or more devices which automatically cut off the supply in the event of an overload (see 433) and a short circuit (see 434), except where the overcurrent is limited in accordance with 436. In addition, overload protection and short circuit protection shall be coordinated with each other in accordance with 435. NOTE
1 Overload protection for live conductors in accordance with 433 may also be used as protection against such faults when the value of the overcurrent which may result from the fault is similar to that of the overload.
2 Application conditions See IEC 60364-4-473:1977.3 The protection of conductors specified in this chapter does not necessarily protect the equipment connected to the conductors. 432 Types of protective devices
Protective devices should have the corresponding types specified in 432.1~432.3. 432.1 Protective devices that protect against both overload current and short-circuit current Protective devices should be able to disconnect any overcurrent including the maximum expected short-circuit current at the installation location. It should meet the requirements of 433 and 434.3.1. These protective devices can be
- Circuit breakers equipped with overload releases; - Circuit breakers combined with fuses;
Fuses with gG characteristic fuses. Note
1 The fuse includes all components that constitute the entire protective device. 2 The premise for using protective devices with a breaking capacity less than the expected short-circuit current at the installation location of the device is to meet the requirements of 434.3.1. 432.2 Protective devices that only prevent overload current Such protective devices are usually inverse time, and their breaking capacity can be less than the expected short-circuit current value at the installation location of the device. They should meet the requirements of 433.
432.3 Protective devices that only prevent short-circuit current can be installed in places where overload protection has been achieved by other means, or in places where overload protection is not allowed according to the provisions of 473. *GH 109631999.GB 14048.2—1994 GB 169171997.*IEC60269-1.IEC60269-2 and GB13539.3-1999 State Quality Supervision Bureau Approved on January 3, 2000 and implemented on August 1, 2000
GH 16895. 5 -2000
Such protective devices should be able to break the maximum short-circuit current including the expected short-circuit current. It shall meet the requirements of 431.
Such protective devices may be:
Circuit breaker equipped with short-circuit current release; a fuse.
432.4 Protection of parallel conductors
For the protection method of parallel conductors against overload current and short-circuit current, see IEC60364-4-17:1981. 433 Overload protection
433.1 General requirements
The protective device shall disconnect the overload current before the temperature rise caused by the overload current of the exposed conductor causes damage to the insulation, connection, terminal and materials around the conductor.
433.2 Coordination of conductor and protective device
The working characteristics of the protective device to prevent cable overload shall meet the following two conditions: 1) IIzi
2) I,≤1. 45 Izl
Where: I——Calculated current of the circuit;
Iz——Continuous current carrying capacity of the cable (see IEC60364-5-523:1983) I. ---Rated current of protective device:
Note 1:For adjustable protective devices, the rated current 1 is a given set current. I: - Current that ensures reliable operation of the protective device within the agreed time. The current that ensures reliable operation of the protective device is given by the product standard or by the manufacturer. Note 2: Protection according to this clause cannot guarantee safe protection under certain circumstances, such as protection against continuous overcurrents less than 1:, and may not necessarily achieve an economical solution. Therefore, it is assumed that the circuit is designed for minor overloads that do not occur frequently for a long time. 434 Short-circuit protection
434.1 General requirements
The protective device should disconnect the short-circuit current before the thermal effects and mechanical forces generated by the short-circuit current on the conductors and connections cause danger. 434-2 Determination of prospective short-circuit current
The prospective short-circuit current at each relevant point of the building's electrical installation should be determined. It can be determined by calculation or by measurement. 434.3 Characteristics of short-circuit protective devices
Each short-circuit protective device shall meet the following two conditions: 434.3.1 The breaking capacity shall not be less than the prospective short-circuit current at the location where the protective device is installed, except for the following cases: If other protective devices with the required breaking capacity are installed on the power supply side, it is permitted for the breaking capacity of this protective device to be less than the prospective short-circuit current. In this case, the characteristics of the two protective devices must be coordinated so that the energy passing through the two devices does not exceed the energy that the protective device on the load side and the conductors protected by the two devices can withstand without damage. Note: In this case, other characteristics need to be considered. For example, for the protective device on the load side, the electromotive stress and arc energy need to be considered. The specific requirements for the characteristics that need to be coordinated should be obtained from the manufacturer of the device. 434.3.2 All currents caused by short circuits at any point in the circuit should be disconnected within a time that does not exceed the time that the current causes the conductor to reach the allowable limit temperature.
For a short circuit lasting no more than 5 s, the time for the conductor to rise from the maximum permissible temperature in normal operation to the limit temperature of *GB10963-1999GB14048.21994 and GB169171997*IEC 60269-1.IEC 60269-2 and GB 13539.3-1999 by a known short-circuit current can be approximately calculated by the following formula: Where: t——Duration;
S——Cross-sectional area, mm; wwW.bzxz.Net
GB 16895. 5- 2000
I———effective value of short-circuit current (r. M, s.), AI——coefficient depending on resistivity, temperature coefficient and heat capacity of conductor material and appropriate initial and final temperatures. The values ​​for phase conductors insulated with commonly used materials are listed in Table 43A. Table 43 Table values ​​for phase A conductors
Conductor insulation
≤300 mm2
Initial temperature, °C
Final temperature, °C
Conductor material
Welded joints of copper conductors
This value also applies to joints that are in contact with each other Cable PVC
>300 mm
EPR/XLPE
Minerals
PVC bare
For locations where non-periodic components of very short duration (<0.1) have a significant effect, as well as current limiting devices, s should be greater than the energy () value provided by the manufacturer of the protective device.
2 The following values ​​are under consideration:
Small α surface (especially cross-section less than 10 mm2); - Short circuit duration exceeds 5 B;
- Other forms of joints of a conductor:
One conductor.
3 The rated current of the short-circuit protection device can be greater than the current carrying capacity of the cable. 4 The above coefficients are based on IEC 60724 435 Coordination of overload protection and short-circuit protection 435.1 Two types of protection provided by one device
If the overload protection device complies with 433 and its breaking capacity is not less than the prospective short-circuit current at the location where the device is installed, it can be assumed that the overload protection device can also be used as short-circuit protection for the load-side conductor at that location. Note: This assumption does not apply to all short-circuit currents and its applicability should be checked in accordance with the requirements of 434.3. 435.2 Two types of protection provided by two devices The provisions of 433 and 434 apply to overload protection devices and short-circuit protection devices respectively. The characteristics of these protective devices must be matched so that the energy allowed to pass through by the short-circuit protection does not exceed the energy that the overload protection device can withstand without damage.
Note: This provision does not exclude the coordination form described in [EC60292-1A]. IEC60292-1A: Low voltage motor starter Part 1: AC direct (full voltage) starter First supplement
Adoption instructions:
17TEC60292-1A: Low voltage motor starter Part 1: AC direct (full voltage) starter (first supplement) standard has been replaced by IEC60947-4-1:1990 Low voltage switchgear and control equipment Part 4 Contactors and motor starters Chapter 1, electromechanical contactors and motor starters.
436 Power supply characteristics for overcurrent limitation
GB16895.5
When the power supply cannot provide a current exceeding the current carrying capacity of the conductor, it can be considered that the conductor has overload protection and short-circuit current protection (such as some bell transformers, welding transformers and some types of temperature difference generator sets). GB16895.52000
Appendix A
(Informative Appendix)
Correspondence between the referenced standards in IEC 60364-4-43 and the Chinese standards that use these standards This standard is equivalent to IEC60364-4-43:1977 Electrical Installations of Buildings Part 4: Safety Protection Chapter 43, Overcurrent Protection\ and its first revision (1997). Since the referenced standards in this standard have not been completely equivalently adopted as Chinese standards, in order to facilitate the use of this standard, Table A1 specifically lists the correspondence between the referenced standards in this standard and the Chinese standards that use these standards. Table A1
TEC60364-4-43 and its referenced standards in the first connection modification Chinese standards using these standards
60269-1:1986 Low-voltage fuses Part 1, basic requirements GB 13539.1-1992
60269-2.1986 Low-voltage fuses Part 2, supplementary requirements for fuses used by full-time personnel (mainly for industrial use)
60269-3.1986 Low-voltage fuses Part 3: Supplementary requirements for fuses used by unskilled personnel (mainly for household and similar purposes)
CGB 13539. 2—1992
Low-voltage fuses
Low-voltage fuses
Supplementary requirements for fuses for use by unskilled personnel
CB13539.3-1999
Corresponding relationship
neq TEC 60269-1.1986
neg 1EC 60269-2:1996
Low-voltage fuses
Part: Supplementary requirements for fuses for use by unskilled personnel (fuses mainly for household and similar purposes) 60898;1995 Electrical accessories - Electrical and similar purposes GB 10963-1999 Overcurrent protection circuit breakers for household and similar purposes
60947-2:1995 Low-voltage switchgear and controlgear Part 2 Circuit breakers
Current protection circuit breakers
GB 1404B. 2—1994
Low-voltage circuit breakers
Low-voltage switchgear and controlgear
GB 16917—1997 Residual current operated circuit breakers (RCBO'S) with overcurrent protection for household and similar purposes
60947-4-1.1990
Residual current operated circuit breakers (RCBO) with overcurrent protection
GB 1404B. 4—1994
Low-voltage switchgear and controlgear
Part 4 Part i Contactors and motor starters Section 1: Electromechanical contactors and motor starters Low-voltage switchgear and controlgear Low-voltage electromechanical contactors and motor starters IEC 60269-3:1987 IEC 60898:1995 IEC 60947-2:1988 IEC 61009 IEC 60947-4-1:19901990199019901990199019903 Characteristics of short-circuit protective devices
Each short-circuit protective device shall meet the following two conditions: 434.3.1 The breaking capacity shall not be less than the expected short-circuit current at the location where the protective device is installed, except for the following cases: If other protective devices with the required breaking capacity have been installed on the power supply side, it is permissible for the breaking capacity of this protective device to be less than the expected short-circuit current. At this time, the characteristics of the two protective devices must be coordinated so that the energy passing through the two devices does not exceed the energy that the protective device on the load side and the conductors protected by the two devices can withstand without damage. Note: In this case, other characteristics need to be considered. For example, for the protective device on the load side, the electromotive stress and arc energy need to be considered. The specific requirements of the characteristics that need to be coordinated should be obtained from the manufacturer of the device. 434.3.2 All currents caused by short circuits at any point in the loop should be disconnected within a time that does not exceed the time that the current causes the conductor to reach the allowable limit temperature.
For a short circuit lasting no more than 5 s, the time for the conductor to rise from the maximum permissible temperature in normal operation to the limit temperature of *GB10963-1999GB14048.21994 and GB169171997*IEC 60269-1.IEC 60269-2 and GB 13539.3-1999 by a known short-circuit current can be approximately calculated by the following formula: Where: t——Duration;
S——Cross-sectional area, mm;
GB 16895. 5- 2000
I———effective value of short-circuit current (r. M, s.), AI——coefficient depending on resistivity, temperature coefficient and heat capacity of conductor material and appropriate initial and final temperatures. The values ​​for phase conductors insulated with commonly used materials are listed in Table 43A. Table 43 Table values ​​for phase A conductors
Conductor insulation
≤300 mm2
Initial temperature, °C
Final temperature, °C
Conductor material
Welded joints of copper conductors
This value also applies to joints that are in contact with each other Cable PVC
>300 mm
EPR/XLPE
Minerals
PVC bare
For locations where non-periodic components of very short duration (<0.1) have a significant effect, as well as current limiting devices, s should be greater than the energy () value provided by the manufacturer of the protective device.
2 The following values ​​are under consideration:
Small α surface (especially cross-section less than 10 mm2); - Short circuit duration exceeds 5 B;
- Other forms of joints of a conductor:
One conductor.
3 The rated current of the short-circuit protection device can be greater than the current carrying capacity of the cable. 4 The above coefficients are based on IEC 60724 435 Coordination of overload protection and short-circuit protection 435.1 Two types of protection provided by one device
If the overload protection device complies with 433 and its breaking capacity is not less than the prospective short-circuit current at the location where the device is installed, it can be assumed that the overload protection device can also be used as short-circuit protection for the load-side conductor at that location. Note: This assumption does not apply to all short-circuit currents and its applicability should be checked in accordance with the requirements of 434.3. 435.2 Two types of protection provided by two devices The provisions of 433 and 434 apply to overload protection devices and short-circuit protection devices respectively. The characteristics of these protective devices must be matched so that the energy allowed to pass through by the short-circuit protection does not exceed the energy that the overload protection device can withstand without damage.
Note: This provision does not exclude the coordination form described in [EC60292-1A]. IEC60292-1A: Low voltage motor starter Part 1: AC direct (full voltage) starter First supplement
Adoption instructions:
17TEC60292-1A: Low voltage motor starter Part 1: AC direct (full voltage) starter (first supplement) standard has been replaced by IEC60947-4-1:1990 Low voltage switchgear and control equipment Part 4 Contactors and motor starters Chapter 1, electromechanical contactors and motor starters.
436 Power supply characteristics for overcurrent limitation
GB16895.5
When the power supply cannot provide a current exceeding the current carrying capacity of the conductor, it can be considered that the conductor has overload protection and short-circuit current protection (such as some bell transformers, welding transformers and some types of temperature difference generator sets). GB16895.52000
Appendix A
(Informative Appendix)
Correspondence between the referenced standards in IEC 60364-4-43 and the Chinese standards that use these standards This standard is equivalent to IEC60364-4-43:1977 Electrical Installations of Buildings Part 4: Safety Protection Chapter 43, Overcurrent Protection\ and its first revision (1997). Since the referenced standards in this standard have not been completely equivalently adopted as Chinese standards, in order to facilitate the use of this standard, Table A1 specifically lists the correspondence between the referenced standards in this standard and the Chinese standards that use these standards. Table A1
TEC60364-4-43 and its referenced standards in the first connection modification Chinese standards using these standards
60269-1:1986 Low-voltage fuses Part 1, basic requirements GB 13539.1-1992
60269-2.1986 Low-voltage fuses Part 2, supplementary requirements for fuses used by full-time personnel (mainly for industrial use)
60269-3.1986 Low-voltage fuses Part 3: Supplementary requirements for fuses used by unskilled personnel (mainly for household and similar purposes)
CGB 13539. 2—1992
Low-voltage fuses
Low-voltage fuses
Supplementary requirements for fuses for use by unskilled personnel
CB13539.3-1999
Corresponding relationship
neq TEC 60269-1.1986
neg 1EC 60269-2:1996
Low-voltage fuses
Part: Supplementary requirements for fuses for use by unskilled personnel (fuses mainly for household and similar purposes) 60898;1995 Electrical accessories - Electrical and similar purposes GB 10963-1999 Overcurrent protection circuit breakers for household and similar purposes
60947-2:1995 Low-voltage switchgear and controlgear Part 2 Circuit breakers
Current protection circuit breakers
GB 1404B. 2—1994
Low-voltage circuit breakers
Low-voltage switchgear and controlgear
GB 16917—1997 Residual current operated circuit breakers (RCBO'S) with overcurrent protection for household and similar purposes
60947-4-1.1990
Residual current operated circuit breakers (RCBO) with overcurrent protection
GB 1404B. 4—1994
Low-voltage switchgear and controlgear
Part 4 Part i Contactors and motor starters Section 1: Electromechanical contactors and motor starters Low-voltage switchgear and controlgear Low-voltage electromechanical contactors and motor starters IEC 60269-3:1987 IEC 60898:1995 IEC 60947-2:1988 IEC 61009 IEC 60947-4-1:19903 Characteristics of short-circuit protective devices
Each short-circuit protective device shall meet the following two conditions: 434.3.1 The breaking capacity shall not be less than the expected short-circuit current at the location where the protective device is installed, except for the following cases: If other protective devices with the required breaking capacity have been installed on the power supply side, it is permissible for the breaking capacity of this protective device to be less than the expected short-circuit current. At this time, the characteristics of the two protective devices must be coordinated so that the energy passing through the two devices does not exceed the energy that the protective device on the load side and the conductors protected by the two devices can withstand without damage. Note: In this case, other characteristics need to be considered. For example, for the protective device on the load side, the electromotive stress and arc energy need to be considered. The specific requirements of the characteristics that need to be coordinated should be obtained from the manufacturer of the device. 434.3.2 All currents caused by short circuits at any point in the loop should be disconnected within a time that does not exceed the time that the current causes the conductor to reach the allowable limit temperature.
For a short circuit lasting no more than 5 s, the time for the conductor to rise from the maximum permissible temperature in normal operation to the limit temperature of *GB10963-1999GB14048.21994 and GB169171997*IEC 60269-1.IEC 60269-2 and GB 13539.3-1999 by a known short-circuit current can be approximately calculated by the following formula: Where: t——Duration;
S——Cross-sectional area, mm;
GB 16895. 5- 2000
I———effective value of short-circuit current (r. M, s.), AI——coefficient depending on resistivity, temperature coefficient and heat capacity of conductor material and appropriate initial and final temperatures. The values ​​for phase conductors insulated with commonly used materials are listed in Table 43A. Table 43 Table values ​​for phase A conductors
Conductor insulation
≤300 mm2
Initial temperature, °C
Final temperature, °C
Conductor material
Welded joints of copper conductors
This value also applies to joints that are in contact with each other Cable PVC
>300 mm
EPR/XLPE
Minerals
PVC bare
For locations where non-periodic components of very short duration (<0.1) have a significant effect, as well as current limiting devices, s should be greater than the energy () value provided by the manufacturer of the protective device.
2 The following values ​​are under consideration:
Small α surface (especially cross-section less than 10 mm2); - Short circuit duration exceeds 5 B;
- Other forms of joints of a conductor:
One conductor.
3 The rated current of the short-circuit protection device can be greater than the current carrying capacity of the cable. 4 The above coefficients are based on IEC 60724 435 Coordination of overload protection and short-circuit protection 435.1 Two types of protection provided by one device
If the overload protection device complies with 433 and its breaking capacity is not less than the prospective short-circuit current at the location where the device is installed, it can be assumed that the overload protection device can also be used as short-circuit protection for the load-side conductor at that location. Note: This assumption does not apply to all short-circuit currents and its applicability should be checked in accordance with the requirements of 434.3. 435.2 Two types of protection provided by two devices The provisions of 433 and 434 apply to overload protection devices and short-circuit protection devices respectively. The characteristics of these protective devices must be matched so that the energy allowed to pass through by the short-circuit protection does not exceed the energy that the overload protection device can withstand without damage.
Note: This provision does not exclude the coordination form described in [EC60292-1A]. IEC60292-1A: Low voltage motor starter Part 1: AC direct (full voltage) starter First supplement
Adoption instructions:
17TEC60292-1A: Low voltage motor starter Part 1: AC direct (full voltage) starter (first supplement) standard has been replaced by IEC60947-4-1:1990 Low voltage switchgear and control equipment Part 4 Contactors and motor starters Chapter 1, electromechanical contactors and motor starters.
436 Power supply characteristics for overcurrent limitation
GB16895.5
When the power supply cannot provide a current exceeding the current carrying capacity of the conductor, it can be considered that the conductor has overload protection and short-circuit current protection (such as some bell transformers, welding transformers and some types of temperature difference generator sets). GB16895.52000
Appendix A
(Informative Appendix)
Correspondence between the referenced standards in IEC 60364-4-43 and the Chinese standards that use these standards This standard is equivalent to IEC60364-4-43:1977 Electrical Installations of Buildings Part 4: Safety Protection Chapter 43, Overcurrent Protection\ and its first revision (1997). Since the referenced standards in this standard have not been completely equivalently adopted as Chinese standards, in order to facilitate the use of this standard, Table A1 specifically lists the correspondence between the referenced standards in this standard and the Chinese standards that use these standards. Table A1
TEC60364-4-43 and its referenced standards in the first connection modification Chinese standards using these standards
60269-1:1986 Low-voltage fuses Part 1, basic requirements GB 13539.1-1992
60269-2.1986 Low-voltage fuses Part 2, supplementary requirements for fuses used by full-time personnel (mainly for industrial use)
60269-3.1986 Low-voltage fuses Part 3: Supplementary requirements for fuses used by unskilled personnel (mainly for household and similar purposes)
CGB 13539. 2—1992
Low-voltage fuses
Low-voltage fuses
Supplementary requirements for fuses for use by unskilled personnel
CB13539.3-1999
Corresponding relationship
neq TEC 60269-1.1986
neg 1EC 60269-2:1996
Low-voltage fuses
Part: Supplementary requirements for fuses for use by unskilled personnel (fuses mainly for household and similar purposes) 60898;1995 Electrical accessories - Electrical and similar purposes GB 10963-1999 Overcurrent protection circuit breakers for household and similar purposes
60947-2:1995 Low-voltage switchgear and controlgear Part 2 Circuit breakers
Current protection circuit breakers
GB 1404B. 2—1994
Low-voltage circuit breakers
Low-voltage switchgear and controlgear
GB 16917—1997 Residual current operated circuit breakers (RCBO'S) with overcurrent protection for household and similar purposes
60947-4-1.1990
Residual current operated circuit breakers (RCBO) with overcurrent protection
GB 1404B. 4—1994
Low-voltage switchgear and controlgear
Part 4 Part i Contactors and motor starters Section 1: Electromechanical contactors and motor starters Low-voltage switchgear and controlgear Low-voltage electromechanical contactors and motor starters IEC 60269-3:1987 IEC 60898:1995 IEC 60947-2:1988 IEC 61009 IEC 60947-4-1:19902 All currents caused by a short circuit at any point in the circuit shall be interrupted within a time not exceeding the time for which the current causes the conductor to reach the permissible limit temperature.
For a short circuit lasting no longer than 5 s, the time for a known short-circuit current to cause the conductor to rise from the maximum permissible temperature in normal operation to the limit temperature of *GB10963-1999GB14048.21994 and GB169171997*IEC 60269-1.IEC 60269-2 and GB 13539.3-1999 can be approximately calculated using the following formula: Where: t - duration;
S - cross-sectional area, mm;
GB 16895. 5- 2000
I - effective value of short-circuit current (r. M, s.), AI - a coefficient depending on the resistivity, temperature coefficient and heat capacity of the conductor material and appropriate initial and final temperatures. The values ​​for phase conductors insulated with commonly used materials are listed in Table 43A. Table 43 Table values ​​for phase A conductors
Conductor insulation
≤300 mm2
Initial temperature, °C
Final temperature, °C
Conductor material
Welded joints of copper conductors
This value also applies to joints that are in contact with each other Cable PVC
>300 mm
EPR/XLPE
Minerals
PVC bare
For locations where non-periodic components of very short duration (<0.1) have a significant effect, as well as current limiting devices, s should be greater than the energy () value provided by the manufacturer of the protective device.
2 The following values ​​are under consideration:
Small α surface (especially cross-section less than 10 mm2); - Short circuit duration exceeds 5 B;
- Other forms of joints of a conductor:
One conductor.
3 The rated current of the short-circuit protection device can be greater than the current carrying capacity of the cable. 4 The above coefficients are based on IEC 60724 435 Coordination of overload protection and short-circuit protection 435.1 Two types of protection provided by one device
If the overload protection device complies with 433 and its breaking capacity is not less than the prospective short-circuit current at the location where the device is installed, it can be assumed that the overload protection device can also be used as short-circuit protection for the load-side conductor at that location. Note: This assumption does not apply to all short-circuit currents and its applicability should be checked in accordance with the requirements of 434.3. 435.2 Two types of protection provided by two devices The provisions of 433 and 434 apply to overload protection devices and short-circuit protection devices respectively. The characteristics of these protective devices must be matched so that the energy allowed to pass through by the short-circuit protection does not exceed the energy that the overload protection device can withstand without damage.
Note: This provision does not exclude the coordination form described in [EC60292-1A]. IEC60292-1A: Low voltage motor starter Part 1: AC direct (full voltage) starter First supplement
Adoption instructions:
17TEC60292-1A: Low voltage motor starter Part 1: AC direct (full voltage) starter (first supplement) standard has been replaced by IEC60947-4-1:1990 Low voltage switchgear and control equipment Part 4 Contactors and motor starters Chapter 1, electromechanical contactors and motor starters.
436 Power supply characteristics for overcurrent limitation
GB16895.5
When the power supply cannot provide a current exceeding the current carrying capacity of the conductor, it can be considered that the conductor has overload protection and short-circuit current protection (such as some bell transformers, welding transformers and some types of temperature difference generator sets). GB16895.52000
Appendix A
(Informative Appendix)
Correspondence between the referenced standards in IEC 60364-4-43 and the Chinese standards that use these standards This standard is equivalent to IEC60364-4-43:1977 Electrical Installations of Buildings Part 4: Safety Protection Chapter 43, Overcurrent Protection\ and its first revision (1997). Since the referenced standards in this standard have not been completely equivalently adopted as Chinese standards, in order to facilitate the use of this standard, Table A1 specifically lists the correspondence between the referenced standards in this standard and the Chinese standards that use these standards. Table A1
TEC60364-4-43 and its referenced standards in the first connection modification Chinese standards using these standards
60269-1:1986 Low-voltage fuses Part 1, basic requirements GB 13539.1-1992
60269-2.1986 Low-voltage fuses Part 2, supplementary requirements for fuses used by full-time personnel (mainly for industrial use)
60269-3.1986 Low-voltage fuses Part 3: Supplementary requirements for fuses used by unskilled personnel (mainly for household and similar purposes)
CGB 13539. 2—1992
Low-voltage fuses
Low-voltage fuses
Supplementary requirements for fuses for use by unskilled personnel
CB13539.3-1999
Corresponding relationship
neq TEC 60269-1.1986
neg 1EC 60269-2:1996
Low-voltage fuses
Part: Supplementary requirements for fuses for use by unskilled personnel (fuses mainly for household and similar purposes) 60898;1995 Electrical accessories - Electrical and similar purposes GB 10963-1999 Overcurrent protection circuit breakers for household and similar purposes
60947-2:1995 Low-voltage switchgear and controlgear Part 2 Circuit breakers
Current protection circuit breakers
GB 1404B. 2—1994
Low-voltage circuit breakers
Low-voltage switchgear and controlgear
GB 16917—1997 Residual current operated circuit breakers (RCBO'S) with overcurrent protection for household and similar purposes
60947-4-1.1990
Residual current operated circuit breakers (RCBO) with overcurrent protection
GB 1404B. 4—1994
Low-voltage switchgear and controlgear
Part 4 Part i Contactors and motor starters Section 1: Electromechanical contactors and motor starters Low-voltage switchgear and controlgear Low-voltage electromechanical contactors and motor starters IEC 60269-3:1987 IEC 60898:1995 IEC 60947-2:1988 IEC 61009 IEC 60947-4-1:19902 All currents caused by a short circuit at any point in the circuit shall be interrupted within a time not exceeding the time for which the current causes the conductor to reach the permissible limit temperature.
For a short circuit lasting no longer than 5 s, the time for a known short-circuit current to cause the conductor to rise from the maximum permissible temperature in normal operation to the limit temperature of *GB10963-1999GB14048.21994 and GB169171997*IEC 60269-1.IEC 60269-2 and GB 13539.3-1999 can be approximately calculated using the following formula: Where: t - duration;
S - cross-sectional area, mm;
GB 16895. 5- 2000
I - effective value of short-circuit current (r. M, s.), AI - a coefficient depending on the resistivity, temperature coefficient and heat capacity of the conductor material and appropriate initial and final temperatures. The values ​​for phase conductors insulated with commonly used materials are listed in Table 43A. Table 43 Table values ​​for phase A conductors
Conductor insulation
≤300 mm2
Initial temperature, °C
Final temperature, °C
Conductor material
Welded joints of copper conductors
This value also applies to joints that are in contact with each other Cable PVC
>300 mm
EPR/XLPE
Minerals
PVC bare
For locations where non-periodic components of very short duration (<0.1) have a significant effect, as well as current limiting devices, s should be greater than the energy () value provided by the manufacturer of the protective device.
2 The following values ​​are under consideration:
Small α surface (especially cross-section less than 10 mm2); - Short circuit duration exceeds 5 B;
- Other forms of joints of a conductor:
One conductor.
3 The rated current of the short-circuit protection device can be greater than the current carrying capacity of the cable. 4 The above coefficients are based on IEC 60724 435 Coordination of overload protection and short-circuit protection 435.1 Two types of protection provided by one device
If the overload protection device complies with 433 and its breaking capacity is not less than the prospective short-circuit current at the location where the device is installed, it can be assumed that the overload protection device can also be used as short-circuit protection for the load-side conductor at that location. Note: This assumption does not apply to all short-circuit currents and its applicability should be checked in accordance with the requirements of 434.3. 435.2 Two types of protection provided by two devices The provisions of 433 and 434 apply to overload protection devices and short-circuit protection devices respectively. The characteristics of these protective devices must be matched so that the energy allowed to pass through by the short-circuit protection does not exceed the energy that the overload protection device can withstand without damage.
Note: This provision does not exclude the coordination form described in [EC60292-1A]. IEC60292-1A: Low voltage motor starter Part 1: AC direct (full voltage) starter First supplement
Adoption instructions:
17TEC60292-1A: Low voltage motor starter Part 1: AC direct (full voltage) starter (first supplement) standard has been replaced by IEC60947-4-1:1990 Low voltage switchgear and control equipment Part 4 Contactors and motor starters Chapter 1, electromechanical contactors and motor starters.
436 Power supply characteristics for overcurrent limitation
GB16895.5
When the power supply cannot provide a current exceeding the current carrying capacity of the conductor, it can be considered that the conductor has overload protection and short-circuit current protection (such as some bell transformers, welding transformers and some types of temperature difference generator sets). GB16895.52000
Appendix A
(Informative Appendix)
Correspondence between the referenced standards in IEC 60364-4-43 and the Chinese standards that use these standards This standard is equivalent to IEC60364-4-43:1977 Electrical Installations of Buildings Part 4: Safety Protection Chapter 43, Overcurrent Protection\ and its first revision (1997). Since the referenced standards in this standard have not been completely equivalently adopted as Chinese standards, in order to facilitate the use of this standard, Table A1 specifically lists the correspondence between the referenced standards in this standard and the Chinese standards that use these standards. Table A1
TEC60364-4-43 and its referenced standards in the first connection modification Chinese standards using these standards
60269-1:1986 Low-voltage fuses Part 1, basic requirements GB 13539.1-1992
60269-2.1986 Low-voltage fuses Part 2, supplementary requirements for fuses used by full-time personnel (mainly for industrial use)
60269-3.1986 Low-voltage fuses Part 3: Supplementary requirements for fuses used by unskilled personnel (mainly for household and similar purposes)
CGB 13539. 2—1992
Low-voltage fuses
Low-voltage fuses
Supplementary requirements for fuses for use by unskilled personnel
CB13539.3-1999
Corresponding relationship
neq TEC 60269-1.1986
neg 1EC 60269-2:1996
Low-voltage fuses
Part: Supplementary requirements for fuses for use by unskilled personnel (fuses mainly for household and similar purposes) 60898;1995 Electrical accessories - Electrical and similar purposes GB 10963-1999 Overcurrent protection circuit breakers for household and similar purposes
60947-2:1995 Low-voltage switchgear and controlgear Part 2 Circuit breakers
Current protection circuit breakers
GB 1404B. 2—1994
Low-voltage circuit breakers
Low-voltage switchgear and controlgear
GB 16917—1997 Residual current operated circuit breakers (RCBO'S) with overcurrent protection for household and similar purposes
60947-4-1.1990
Residual current operated circuit breakers (RCBO) with overcurrent protection
GB 1404B. 4—1994
Low-voltage switchgear and controlgear
Part 4 Part i Contactors and motor starters Section 1: Electromechanical contactors and motor starters Low-voltage switchgear and controlgear Low-voltage electromechanical contactors and motor starters IEC 60269-3:1987 IEC 60898:1995 IEC 60947-2:1988 IEC 61009 IEC 60947-4-1:19904 The above coefficients are based on IEC 60724 435 Coordination of overload protection and short-circuit protection 435.1 Two types of protection provided by one device
If the overload protection device complies with 433 and its breaking capacity is not less than the prospective short-circuit current at the location where the device is installed, it can be assumed that the overload protection device can also be used as short-circuit protection for the load-side conductor at that location. Note: This assumption does not apply to all short-circuit currents and its applicability should be checked in accordance with the requirements of 434.3. 435.2 Two types of protection provided by two devices The provisions of 433 and 434 apply to overload protection devices and short-circuit protection devices respectively. The characteristics of these protective devices must be matched so that the energy allowed to pass through by the short-circuit protection does not exceed the energy that the overload protection device can withstand without damage.
Note: This provision does not exclude the coordination form described in [EC60292-1A]. IEC60292-1A: Low voltage motor starter Part 1: AC direct (full voltage) starter First supplement
Adoption instructions:
17TEC60292-1A: Low voltage motor starter Part 1: AC direct (full voltage) starter (first supplement) standard has been replaced by IEC60947-4-1:1990 Low voltage switchgear and control equipment Part 4 Contactors and motor starters Chapter 1, electromechanical contactors and motor starters.
436 Power supply characteristics for overcurrent limitation
GB16895.5
When the power supply cannot provide a current exceeding the current carrying capacity of the conductor, it can be considered that the conductor has overload protection and short-circuit current protection (such as some bell transformers, welding transformers and some types of temperature difference generator sets). GB16895.52000
Appendix A
(Informative Appendix)
Correspondence between the referenced standards in IEC 60364-4-43 and the Chinese standards that use these standards This standard is equivalent to IEC60364-4-43:1977 Electrical Installations of Buildings Part 4: Safety Protection Chapter 43, Overcurrent Protection\ and its first revision (1997). Since the referenced standards in this standard have not been completely equivalently adopted as Chinese standards, in order to facilitate the use of this standard, Table A1 specifically lists the correspondence between the referenced standards in this standard and the Chinese standards that use these standards. Table A1
TEC60364-4-43 and its referenced standards in the first connection modification Chinese standards using these standards
60269-1:1986 Low-voltage fuses Part 1, basic requirements GB 13539.1-1992
60269-2.1986 Low-voltage fuses Part 2, supplementary requirements for fuses used by full-time personnel (mainly for industrial use)
60269-3.1986 Low-voltage fuses Part 3: Supplementary requirements for fuses used by unskilled personnel (mainly for household and similar purposes)
CGB 13539. 2—1992
Low-voltage fuses
Low-voltage fuses
Supplementary requirements for fuses for use by unskilled personnel
CB13539.3-1999
Corresponding relationship
neq TEC 60269-1.1986
neg 1EC 60269-2:1996
Low-voltage fuses
Part: Supplementary requirements for fuses for use by unskilled personnel (fuses mainly for household and similar purposes) 60898;1995 Electrical accessories - Electrical and similar purposes GB 10963-1999 Overcurrent protection circuit breakers for household and similar purposes
60947-2:1995 Low-voltage switchgear and controlgear Part 2 Circuit breakers
Current protection circuit breakers
GB 1404B. 2—1994
Low-voltage circuit breakers
Low-voltage switchgear and controlgear
GB 16917—1997 Residual current operated circuit breakers (RCBO'S) with overcurrent protection for household and similar purposes
60947-4-1.1990
Residual current operated circuit breakers (RCBO) with overcurrent protection
GB 1404B. 4—1994
Low-voltage switchgear and controlgear
Part 4 Part i Contactors and motor starters Section 1: Electromechanical contactors and motor starters Low-voltage switchgear and controlgear Low-voltage electromechanical contactors and motor starters IEC 60269-3:1987 IEC 60898:1995 IEC 60947-2:1988 IEC 61009 IEC 60947-4-1:19904 The above coefficients are based on IEC 60724 435 Coordination of overload protection and short-circuit protection 435.1 Two types of protection provided by one device
If the overload protection device complies with 433 and its breaking capacity is not less than the prospective short-circuit current at the location where the device is installed, it can be assumed that the overload protection device can also be used as short-circuit protection for the load-side conductor at that location. Note: This assumption does not apply to all short-circuit currents and its applicability should be checked in accordance with the requirements of 434.3. 435.2 Two types of protection provided by two devices The provisions of 433 and 434 apply to overload protection devices and short-circuit protection devices respectively. The characteristics of these protective devices must be matched so that the energy allowed to pass through by the short-circuit protection does not exceed the energy that the overload protection device can withstand without damage.
Note: This provision does not exclude the coordination form described in [EC60292-1A]. IEC60292-1A: Low voltage motor starter Part 1: AC direct (full voltage) starter First supplement
Adoption instructions:
17TEC60292-1A: Low voltage motor starter Part 1: AC direct (full voltage) starter (first supplement) standard has been replaced by IEC60947-4-1:1990 Low voltage switchgear and control equipment Part 4 Contactors and motor starters Chapter 1, electromechanical contactors and motor starters.
436 Power supply characteristics for overcurrent limitation
GB16895.5
When the power supply cannot provide a current exceeding the current carrying capacity of the conductor, it can be considered that the conductor has overload protection and short-circuit current protection (such as some bell transformers, welding transformers and some types of temperature difference generator sets). GB16895.52000
Appendix A
(Informative Appendix)
Correspondence between the referenced standards in IEC 60364-4-43 and the Chinese standards that use these standards This standard is equivalent to IEC60364-4-43:1977 Electrical Installations of Buildings Part 4: Safety Protection Chapter 43, Overcurrent Protection\ and its first revision (1997). Since the referenced standards in this standard have not been completely equivalently adopted as Chinese standards, in order to facilitate the use of this standard, Table A1 specifically lists the correspondence between the referenced standards in this standard and the Chinese standards that use these standards. Table A1
TEC60364-4-43 and its referenced standards in the first connection modification Chinese standards using these standards
60269-1:1986 Low-voltage fuses Part 1, basic requirements GB 13539.1-1992
60269-2.1986 Low-voltage fuses Part 2, supplementary requirements for fuses used by full-time personnel (mainly for industrial use)
60269-3.1986 Low-voltage fuses Part 3: Supplementary requirements for fuses used by unskilled personnel (mainly for household and similar purposes)
CGB 13539. 2—1992
Low-voltage fuses
Low-voltage fuses
Supplementary requirements for fuses for use by unskilled personnel
CB13539.3-1999
Corresponding relationship
neq TEC 60269-1.1986
neg 1EC 60269-2:1996
Low-voltage fuses
Part: Supplementary requirements for fuses for use by unskilled personnel (fuses mainly for household and similar purposes) 60898;1995 Electrical accessories - Electrical and similar purposes GB 10963-1999 Overcurrent protection circuit breakers for household and similar purposes
60947-2:1995 Low-voltage switchgear and controlgear Part 2 Circuit breakers
Current protection circuit breakers
GB 1404B. 2—1994
Low-voltage circuit breakers
Low-voltage switchgear and controlgear
GB 16917—1997 Residual current operated circuit breakers (RCBO'S) with overcurrent protection for household and similar purposes
60947-4-1.1990
Residual current operated circuit breakers (RCBO) with overcurrent protection
GB 1404B. 4—1994
Low-voltage switchgear and controlgear
Part 4 Part i Contactors and motor starters Section 1: Electromechanical contactors and motor starters Low-voltage switchgear and controlgear Low-voltage electromechanical contactors and motor starters IEC 60269-3:1987 IEC 60898:1995 IEC 60947-2:1988 IEC 61009 IEC 60947-4-1:19901995 Low-voltage switchgear and controlgear Part 2 Circuit breakers
Current protection circuit breakers
GB 1404B. 2—1994
Low-voltage switchgear and controlgear
GB 16917—1997 Household and similar purposes with 61009: Residual current operated circuit breakers (RCBO's) with overcurrent protection
60947-4-1.1990
Residual current operated circuit breakers (RCBO) with overcurrent protection
GB 1404B. 4—1994
Low-voltage switchgear and controlgear
Part 4 Part i Contactors and motor starters Section 1: Electromechanical contactors and motor starters Low-voltage switchgear and controlgear Low-voltage electromechanical contactors and motor starters IEC 60269-3:1987 IEC 60898:1995 IEC 60947-2:1988 IEC 61009 IEC 60947-4-1:19901995 Low-voltage switchgear and controlgear Part 2 Circuit breakers
Current protection circuit breakers
GB 1404B. 2—1994
Low-voltage switchgear and controlgear
GB 16917—1997 Household and similar purposes with 61009: Residual current operated circuit breakers (RCBO's) with overcurrent protection
60947-4-1.1990
Residual current operated circuit breakers (RCBO) with overcurrent protection
GB 1404B. 4—1994
Low-voltage switchgear and controlgear
Part 4 Part i Contactors and motor starters Section 1: Electromechanical contactors and motor starters Low-voltage switchgear and controlgear Low-voltage electromechanical contactors and motor starters IEC 60269-3:1987 IEC 60898:1995 IEC 60947-2:1988 IEC 61009 IEC 60947-4-1:1990
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