GB 16895.4-1997 Electrical installations in buildings Part 5: Selection and installation of electrical equipment Chapter 53: Switchgear and controlgear
Some standard content:
GB 16895. 41997
This standard adopts IEC364-5-53:1994 "Electrical installations in buildings Part 5: Selection and installation of electrical equipment Chapter 53: Switchgear and controlgear" and IEC3645537:1981 "Electrical installations in buildings Part 5: Selection and installation of electrical equipment Chapter 53: Switchgear and controlgear Section 537: Disconnectors and switchgear". GB168952 Electrical installations in buildings 3 is divided into the following 7 parts under the general title: Part 1 Scope, purpose and basic principles Part 2: Definitions Part S: 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 combines the two TEC documents IEC364-5-53: 1994 and IEC364-5-5371981 (including IEC3645537: 1989 No. 1 revision document). This standard was proposed by the Ministry 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: Tianjin Electric Drive Design and Construction Institute. The authors of this standard are Chen Xuexie, Pianyun, Fan Lei and Chen Gang. This standard was published in December 1997. The interpretation of this standard is entrusted to Dajin Electric Drive Design Institute. GB 16895.4-1997 IEC364-5-53 Foreword 1) IEC (International Electrotechnical Commission) is a worldwide standardization organization composed of all national electrotechnical committees (EEC National Committees). The purpose of IEC is to promote international cooperation on standardization issues in the electrical and electronic fields. To this end, among other activities, IEC publishes international standards. The preparation of standards is entrusted to technical committees, and any IEC National Committee interested in the issues covered by the standards participates in this work. International, governmental and non-governmental organizations associated with IEC also participate in this work. IEC and the International Organization for Standardization (ISO) work closely together under conditions determined by inter-organizational collaboration. 2) IEC formal resolutions or agreements on technical matters are prepared by technical committees in which national committees with special interest in these matters participate and express as far as possible an internationally consistent view on the subject matter involved. 3) These resolutions or agreements, published in the form of standards, technical reports or guidelines, are recommended for international use and are recognized in this sense by the national committees responsible. 4) In order to promote international consensus, IEC national committees should undertake to apply IEC international standards to the greatest extent possible in their national or regional standards. Any differences between IEC standards and corresponding national or regional standards should be clearly indicated in their national or regional standards.
International Standard JFC364-5-53 was prepared by IFC Technical Committee No. 64 (Electrical Installations in Buildings). This second edition cancels and replaces the first edition published in 1986 and Amendment 2 (1992) to form a technical revision. In this second edition, the section numbering method is similar to IEC 364-4. The new Chapter 530 corresponds to the old Chapters 530 and 531: the new Chapter 531 corresponds to the old Chapter 532; the new Chapter 536 corresponds to the old Chapter 537, and the new Chapter 539 corresponds to the old Chapter 536. This new edition of the Standard contains texts referenced from the publications listed in the table below: Six-month law/115
64(CO)15)
64(CO)136
64(CO)164
64(CO)197
64(CO)198
The new texts are based on the following documents
64(CO)222
Voting report
64(CO)159
64(CO)145
64(CO)176
64(CO)217
64(CO)226
IFC publication number
364 3 5361586
Amcnd.1(1989)
Amend.2(1992)
Voting Report
64(CO)237
Details of the voting for this standard are given in the voting report listed in the table above. CB 16895. 4-1997
IEC364-5-537 Foreword
1) IEC formal resolutions or agreements on technical issues are made by technical committees composed of national committees that are particularly concerned with these issues, and express international consensus on the issues involved as far as possible. 2) These resolutions or agreements are made in the form of standards for international use and are accepted by 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 national conditions. Any inconsistency between IEC standards and corresponding national regulations shall be clearly stated in the national regulations as far as possible.
GB16895.4—1997
IEC364-5-537 Preface
This standard was prepared by IEC Technical Committee 64 (Electrical Installations in Buildings). The draft of this standard was discussed at the Moscow Conference in 1977 and the Sydney Conference in 1979. According to the results of the latter meeting, the draft, namely Document 64 (CPC Office) 81, was submitted to the National Committees for voting in September 1979 in accordance with the "six-month method". The National Committees of the following countries voted explicitly in favor of publication: Argentina
Australia
Austria
Belgium
Canada
Israel
Italy
South Korea
Romania
South Africa (Republic)
+Turkey
In addition, the wording of sub-clause 537.4.3, Document 64 (Central Office) 97, was sent in September 1980 for approval in accordance with the "two H procedures".
The National Committees of the following countries voted explicitly in favor of publication: Australia
Belgium
Canada
refers to the former Soviet Union.
Italy
New Zealand
Romania
Spain
Turkey
Soviet Union"
National Standard of the People's Republic of China
Electrical installations of buildingsPart 5;Selection and erection of electrical equipmentChapter 53:Switrhgear and controlgear53.1 Scope
GB 16895, 4—1997
idt IEC 364-5-53: 1994
IEC 364-5-537 :1981
This chapter specifies the selection and installation of equipment. It provides various protective measures that meet safety requirements. These provisions meet the requirements for achieving the intended functions of electrical equipment, and these requirements are compatible with various foreseeable external influences. The selection and installation of each device shall comply with the provisions of the following sections of this chapter and the relevant provisions of other chapters of this standard. 53.2 Cited standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB14821.1-93 Protection against electric shock of electrical installations in buildings (cqvIEC 364-4-41:1992) GB16916-1997 Residual current operated circuit breakers (RCCB) for household and similar purposes without overcurrent protection (itllIEC1008:1990)
GB16917-1997 Residual current operated circuit breakers (RCBO) for household and similar purposes with overcurrent protection (idtIEC1009:1991
Low positive fuses Part 3: Supplementary requirements for fuses used by unskilled personnel (Note: mainly household and similar user-use fuses IEC269-3:1987
￥: G59815-88 refers to FC:269-3 and TEC241:JB4011.385 Winter lighting adopts IEC269-3IEC3G4-4-43:1977 Electrical installations in buildings Part 4: Safety protection Chapter 43: Overcurrent protection IEC361-4-173:1977 Electrical installations in buildings Part 4: Safety protection Chapter 47: Application of safety protection measures Section 473: Protection measures against overcurrent
Electrical installations in buildings Part 4: Safety protection Chapter 48: Selection of protection measures according to external influences 1EC 364-4-482:1982
Implementation Section 482: Fire protection
TEC364-6-61:1986 Electrical installations in buildings Part 6: Inspection Chapter 61: Initial inspection IEC364-7-705:1784 Electrical installations in buildings Part 7: Requirements for special installations or locations Section 705: Electrical installations in agricultural and horticultural facilities
530 General requirements
The requirements of this chapter supplement the general provisions of Chapter 51 of 1EC364-5 Selection and installation of electrical equipment. Approved by the State Administration of Technical Supervision on December 26, 1997, and implemented on December 1, 1998
GB16895.4—1997
530.1 The moving contacts on all poles of multi-pole electrical appliances shall be mechanically linked so that they can be reliably closed and opened at the same time. The contact for the neutral conductor may be closed before the other contacts are closed, and opened after the other contacts are opened. 530.2 In a multi-phase circuit, except as specified in 537.2.4, a single-pole electrical appliance shall not be installed in a neutral conductor. In a single-phase circuit, a single-pole electrical appliance shall not be installed in a neutral conductor, except for a circuit with a residual current protection device that complies with 413.1 of IEC364 on the power supply side. 530.3 Electrical appliances with multiple functions shall comply with all requirements of this chapter for each individual function. 531 Indirect contact protective appliances that automatically cut off the power supply 531.1 Overcurrent protective appliances
531.1.1 TN system
In the TN system, overcurrent protective appliances shall be selected and installed in accordance with the conditions specified in 473.2.473.3 of IEC364-4-473 and 533.3 of this chapter for short-circuit protective appliances. And they shall meet the provisions of 7.3.3 of GB14821.1. 53F. 1. 2TT system
In consideration of the city.
531.1.3 IT system
When the exposed conductive parts are interconnected, the overcurrent protective appliances that protect against the second fault shall meet the requirements of 531.1.1 and take into account the provisions of 7.1.5.5 of GB14821.1-93. 531.2 Residual current protective devices
531.2.1 General conditions for electrical installations
Residual current protective devices in DC systems should be specially designed for detecting DC residual current and disconnecting the circuit current under normal and fault conditions.
531.2.1.1 Residual current protective devices should ensure that they can disconnect all live conductors of the protected circuit. In TN-S systems, if the neutral conductor of the power supply is indeed at ground potential, the neutral conductor does not need to be disconnected. Note: The conditions for confirming that the neutral conductor is indeed at ground potential are in the test points: 531.2.1.2 The protective conductor should not pass through the circuit of the residual current protective device. 531.2.1.3 The selection of residual current protective devices and the division of the circuit should ensure that any leakage current to the ground that is expected to occur when the load connected to the circuit stops normal operation will not cause the protective device to malfunction: The residual current protective device can operate when the residual current exceeds 50% of the rated residual operating current value. 531.2.1.4 The influence of DC input
is under consideration.
531.2.1.5 The use of residual current protective devices in a circuit without a protective conductor should not be used as a protective measure sufficient to prevent indirect contact, even if the rated residual operating current does not exceed 30nA. 531.2.2 Selection based on the application method of the protective device 531.2.2.1 According to the requirements of 531.2.2.2, select the auxiliary power supply of the residual current protective device. Note: The auxiliary power supply can be a power supply system. 531.2.2.2 Only when one of the following two conditions is met, it is allowed to use a residual current protective device that does not automatically operate in the event of an auxiliary power failure:
Even if the auxiliary power supply fails, it can still meet the requirements for protection against indirect contact specified in 7.1 of GH14821.1-93.
\--The protective devices installed in the electrical installation shall be operated, tested and inspected by full-time personnel (BA4) or trained personnel (BA5). 531.2.3TN system
If some equipment or some parts of the electrical installation cannot meet the requirements of 7.1.3 of GB14821.1-93, those parts can be protected by residual current protective devices. In this case, as long as the exposed conductive parts are connected to the grounding electrode with a resistance suitable for the GB 16895. 4:1997
operating current of the residual current protective device, these exposed conductive parts do not need to be connected to the protective conductor of the IV grounding system. The circuit protected in this way can be treated as a TT system, and the residual current protective device shall comply with the provisions of 7.1.4 of GB14821.1-93. However, if there is no separate grounding electrode, it is necessary to connect the exposed conductive parts to the protective conductor on the power supply side of the residual current protective device.
531.2.4TT system
If only one residual current protective device is used to protect an electrical device, the protective device should be installed at the power incoming terminal of the electrical device, unless the power incoming terminal of the electrical device and the part of the electrical device between the power incoming terminal and the protective device meet the requirements of Class I equipment or have the same insulation level as that of Class I equipment (7.2 in GB14821.1-93): When there are more than one power incoming terminal, this requirement applies to each incoming terminal. 531.2.5IT system
When protected by residual current protective devices and there is no provision for disconnecting the circuit after the first fault, the specified residual non-operating current value of the device shall be at least equal to the current flowing through the fault circuit during the first ground fault, ignoring the impedance between the relative grounds. 531.3 Insulation monitoring devices
The insulation monitoring device installed in accordance with the provisions of 7.1.5.4 of B14821.1-93 is an appliance that continuously monitors the insulation of electrical equipment. It is used to indicate a significant decrease in the insulation level of the electrical equipment so that the cause of the decrease in the insulation level can be found before the second fault occurs, thereby avoiding power outage.
The setting value of the insulation resistance of the insulation tester of the applicable electrical installation shall be set below the value specified in G12.3 of 1FC364-6-61:1986.
The insulation tester shall also be designed or installed so that its setting value can be changed only by using the key or pressing the key. 532 Thermal effect protection devices
are under consideration.
Note that in the same period, the provisions of 282-2.10 of [EC:34-4-4R2:2682 and 705.422 of 1E36:-7-7C:1681 shall be implemented. 533 Overcurrent protection devices
533.1 Requirements for on-time
533.1.1 The low rate of the spiral fuse shall be connected so that the center contact is connected to the power supply. 533.1.2 The arrangement of the holder for the fuse-carrying element of the plug-in fuse shall be such that the fuse-link cannot be connected to the conductive part of two adjacent fuse-links.
533-1.3 When the fuse-link of a fuse-link may be replaced or moved by non-specialized personnel (BA4) or unskilled personnel (BA5), this fuse-link is a type that complies with the safety requirements of TEC269-3. The fuse or the combination protective device with the fuse-link shall only be replaced by full-time personnel (BA4) or skilled personnel (BA5), and its installation shall be in a way that ensures that there will be no accidental contact with the live parts when the fuse-link is replaced. 533.1.4 When the circuit breaker may be operated by a skilled person (HA4) or by an unskilled person (BA5), the circuit breaker shall be designed or installed so that it is not possible to modify the setting of its overcurrent release without careful action (including the use of a key or a second hand), and such setting or operation leaves little trace of the product.
533.2 Selection of overload protection devices for wiring systems The nominal current (or setting current) of the protection device shall be selected in accordance with 433.2 of IEC364-1-43:1977. Note: In some cases, to avoid false operation, the peak current of the load shall be taken into account. In the case of some loads, the values of I.1 and I.2 shall be selected on the basis of the thermal equivalent constant load values of the corresponding I.1 and I.2 values. =Total:
is the design current of the circuit;
1: is the continuous current carrying capacity of the cable;
1. is the nominal current of the protective device;
I: is the current to ensure the effective action of the protective device. 533.3 Selection of short-circuit protective devices for wiring systems GB 16895. 4 -1997
When applying the provisions of IEC 364-4-43 for short-circuit durations of 5: and below, the minimum and maximum short-circuit conditions should be taken into account. When the standard specifies both the rated operating short-circuit breaking capacity and the extreme short-circuit breaking capacity for the protective device, it is allowed to select the protective device based on the extreme short-circuit breaking capacity under the maximum short-circuit condition. However, depending on the operating conditions, people sometimes want to select the protective device according to the operating short-circuit breaking capacity, such as when the protective device is installed at the power supply line end of the electrical device. 534 Overvoltage protective device
Under consideration.
535 Undervoltage protective device
Examples of undervoltage protective devices are:
Undervoltage relay or operating switch or circuit breaker with release: non-locking contactor.
536 Isolation and switching devices (see IEC364-5-537) 537 Isolation and switching devices
537.1 General requirements
According to the provisions of 462 to 465 of IEC364-446 (IEC364-4-4h Electrical installations of buildings Part 4: Safety protection Chapter 46: Isolation and switching), all electrical appliances used as isolation and sweet switches shall comply with their layout requirements. If an electrical appliance is used for multiple functions, it shall comply with the requirements of each function.
Note: In some cases, combined functions may require some additional requirements. 537.2 Isolation devices
537.2.1 According to the provisions of 461.2 of IFC364-4-46, the isolation screen shall effectively isolate all live power supply conductors from the relevant circuits. The equipment used for isolation shall comply with the provisions of 537.2.1.1 to 537.2.5. 537.2.1-1 Isolating electrical appliances shall meet the following two conditions: a) In new, clean and dry conditions, when the contacts are in the disconnected position, the relationship between the impulse voltage that each pole contact can withstand and the nominal output of the electrical device is shown in Table 53A.
Note: For considerations other than isolation, the minimum distance must also be greater than the distance corresponding to the impulse rejection. Table 53A: Impulse withstand voltage corresponding to nominal voltage Nominal voltage of the device
Three-phase system. V
230/400.277/480
4/640.5772100
Single-phase system with neutral point. V
120-340
Isolating device impulse withstand voltage k
Overvoltage category
Overvoltage category V
+ IEC 38: IEC standard voltage (1983) Other nominal voltages See IEC 364-4-443 Part 4: Protection against safety, Chapter 44: Failure to protect against overcurrent, Chapter 43 Section: Protection against atmospheric or switching overvoltage, see table B. See table B in Appendix B of 1FC364-4-443, voltage of grounded system, 1 For transient atmospheric overvoltage, there is no difference between grounded system and ungrounded system 2 The pressure caused by the impact is considered according to the GOD m of the sea technology. GB 16895. 4--1997
b) The leakage current between the disconnected contacts shall not exceed the following values: 0.5 mA per pole under standard, clean and dry conditions. 6 mA per pole when the agreed service life of the appliance is determined in the relevant standards. During the test, the positive value of the voltage applied between the contacts of each pole is equal to 110% of the phase voltage value corresponding to the nominal voltage of the electrical device. When making a DC test, the DC voltage value should be the same as the root mean square value of the AC test voltage value. 537.2.1.2 The isolation distance between the disconnected contacts should be visible or obvious, and reliably marked with the mark "open" or "broken". This marking only appears when the isolation distance has been reached between the disconnected contacts of each pole. Note: This marking can use the symbols ")\ and "I" to indicate the open and closed positions respectively. 537.2.1.3 Semiconductor devices should not be used as isolating devices. 537.2.2 The design and installation of isolating devices should prevent accidental closure. Note: Such closure may be caused by collision and vibration. 537.2.3 Measures should be taken to secure the unloaded isolating devices to prevent unintentional and random disconnection. Note: To meet this requirement, the isolating devices can be moved to a lockable place or in an outer protective object, or locked with a padlock. As an alternative measure, the unloaded isolating devices and individual Interlocking of electrical appliances that can be disconnected with load
537.2.4 It is advisable to use multi-pole switching electrical appliances that can disconnect all poles of the connected power supply as the isolation section, but it does not exclude the use of multiple single-pole electrical appliances close to each other.
Note: Isolation can be achieved by the following devices, such as: isolators, multi-pole or double-pole disconnectors, plugs and sockets
Tower disconnector:
Connection piece,
A special terminal that does not require the removal of the wire, 537.2.5 All electrical appliances used for isolation should clearly indicate the path it isolates, such as with a mark. 537.3 Electrical appliances used to disconnect power during mechanical maintenance wwW.bzxz.Net
537.3.1 The electrical appliances used to disconnect the power supply during maintenance of the machine shall be connected to the power supply circuit. When a switch is installed for this purpose, the switch shall be able to cut off the full load current of the relevant part of the electrical equipment. They do not necessarily need to disconnect all the power-consuming conductors.
Only when the following conditions are provided, which are equivalent to the condition of direct power failure, can the control circuit of the electric drive bag device or similar device be disconnected.
The installation of the equipment is accompanied by a measure, such as a mechanical controller, or the control appliance used meets the requirements of a certain IEC specification. Note: The isolation during maintenance of the machine can be achieved by the following measures, such as: multi-pole switch:
New circuit breaker:
Connectors operated by control switches:
Plugs and sockets.
537.3.2 Appliances used for disconnection during machinery maintenance or control switches for such appliances shall be manually operated. The electrical gap between the disconnected contacts shall be visible or obvious and reliably marked with the mark "open" or "broken". This marking shall only appear when the isolation distance has been reached between the disconnected contacts of each pole. Method: This marking may use the symbol "time" and ":" to indicate the open and closed positions respectively. 537.3.3 Appliances used for disconnection during machinery maintenance shall be designed and/or installed to prevent accidental closing. Note: This closure may be caused by factors such as collision and vibration. 533.4 Electrical appliances used to cut off power during mechanical maintenance. Their installation plates and signs are easy to identify and use. 537.4 Emergency switch (including emergency stop) devices CB16895.41997
537.4.1 Emergency switch devices should have the ability to cut off the full load current of the relevant parts of the electrical installation, and the stall current of the motor should be considered when necessary.
537.4.2 Emergency switch devices may include: a switch device that can directly cut off the relevant power supply; a group of devices that cut off the relevant power supply activated by a single action. For emergency stop, maintenance power supply may be necessary, such as providing the power required for braking moving parts. General: The image switch can be completed by the following electrical appliances, such as: parallel switches in the main circuit;
buttons and similar electrical appliances in the control (rotation) circuit. 537.4.3 Whenever feasible, manually operated switch devices should be selected to directly disconnect the main circuit. Remotely controlled circuit breakers, contactors, etc., should be disconnected by coil de-energization or other equivalent safety-enhancing methods. 537.4.4 The operating devices (handles, buttons, etc.) of emergency switchgear should be clearly identifiable, preferably in red with a contrasting background.
537.4.5 Operating devices should be easily accessible at locations where danger may occur and at any additional remote locations where this danger can be eliminated.
537.4.6 Unless the operating device for the emergency switch and the operating device for re-energizing are controlled by the same person, the operating device of the emergency switch should be able to be locked or limited in the "off" or "stop" position. The tripping of the emergency switch should not cause the relevant parts of the electrical installation to be re-energized. 537.4.7 The installation position and markings of emergency switches, including emergency stops, should be easy to identify and use. 537.5 Functional switches
537.5.1 Functional switches should be suitable for performing the heaviest possible work system. 537.5. 2 Functional switch electrical appliances can only control the current without disconnecting its corresponding pole. Note: 1. Conductor switch devices are examples of devices that can cut off the current in the circuit without disconnecting the corresponding pole. 2 Kinetic switch can be realized by the following electrical appliances, for example: switch: semiconductor device; fuse; relay: ... Plugs and plugs of 16A and below, 537.5.3 Disconnectors, fuses and connecting pieces should not be used as functional switches. 539 Coordination of various protective electrical appliances 539.1 The selectivity between overcurrent protection devices is under test.
539.2 Combination of residual current protection devices and overcurrent protection devices 539.2.1 When residual current protection devices are combined or merged with overcurrent protection devices, the combined characteristics of the protection devices (breaking capacity, operating characteristics related to rated current) shall meet the requirements of IEC 364-4-43; 433 and 434 of 1977, and the provisions of 533.2 and 533.3 of this chapter,
539.2.2 When the residual current protective device is neither combined with the overcurrent protective device nor combined with it, the overcurrent protection shall be undertaken by the appropriate protective device in accordance with the provisions of TEC364-4-473; the residual current protective device shall be able to withstand the thermal effect and dynamic stress that it is likely to suffer when the load side of the installation is short-circuited without damage; the residual current protective device shall be able to withstand the short-circuit, even when the residual current protective device itself tends to open due to unbalanced current or ground current.
GB 16895.4—1997
Note: The above mentioned thermal effects and stresses depend on the short-circuit current at the installation site of the residual current protection device and the characteristics of the device that acts as the short-circuit protection. 539.3 Selectivity of residual current protection devices In the event of a fault, especially when safety issues are involved, in order to maintain uninterrupted power supply to the fault-free parts of the equipment, the residual current protection devices installed by Zhonglian need to be selective. This selectivity can be achieved by properly selecting and installing residual current protection devices. When the residual current protection devices provide necessary protection to various parts of the installation, only the residual current protection devices on the power supply side closest to the fault point will be disconnected. The device is disconnected, and it only cuts off the power supply to the part of the device that is loaded.
To ensure the selectivity between the two residual current devices connected in series, the following two conditions must be met: a) The non-operating time-current characteristic curve of the residual current device on the power supply side (E-level) is located on the load side (lower level). The operating time-current characteristic curve of all residual current devices is ". b) The rated residual operating current of the residual current device on the power supply side should be larger than that on the load side, and the residual current device that meets the requirements of GB16916 and GB16917, the rated residual operating current of the device on the power supply side should be at least three times that of the device on the load side.
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