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GB 16895.5-2012: [GB/T 16895.5-2012] Low-voltage electrical installations -- Part 4-43: Protection for safety -- Protection against overcurrent
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[GB/T 16895.5-2012] Low-voltage electrical installations -- Part 4-43: Protection for safety -- Protection against overcurrent
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| GB 16895.5-2000 | English | 319 |
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Electrical installations of buildings-Part 4: Protection for safety-Chapter 43: Protection against overcurrent
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Basic data | Standard ID | GB 16895.5-2012 (GB16895.5-2012) | | Description (Translated English) | [GB/T 16895.5-2012] Low-voltage electrical installations -- Part 4-43: Protection for safety -- Protection against overcurrent | | Sector / Industry | National Standard | | Classification of Chinese Standard | Q77 | | Classification of International Standard | 91.140.50 | | Word Count Estimation | 27,230 | | Older Standard (superseded by this standard) | GB 16895.5-2000 | | Quoted Standard | GB 16895.6-2000; IEC 60269-2; IEC 60269-3; IEC 60269-4; IEC 60364-4-41; IEC 60439-2; IEC 60947-2; IEC 60947-3; IEC 60947-6-2; IEC 60724; IEC 60898-1; IEC 60898-2; IEC 61009-1; IEC 61009-2-1; IEC 61009-2-2; IEC 61534-1; IEC 61534-21; IEC 61534-22 | | Adopted Standard | IEC 60364-4-43-2008, IDT | | Regulation (derived from) | National Standards Bulletin No. 13 of 2012 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This Chinese standard provides live conductor overcurrent protection requirements. This standard describes the live conductors in the event of overload (see 433) and short (see 434) how to by one or more electrical protection automatically cut off the pow | GB 16895.5-2012: [GB/T 16895.5-2012] Low-voltage electrical installations -- Part 4-43: Protection for safety -- Protection against overcurrent
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Low-voltage electrical installations.Part 4-43. Protection for safety.Protection against overcurrent
ICS 91.140.50
Q77
National Standards of People's Republic of China
Replacing GB 16895.5-2000
Low-voltage electrical installations
Part 4-43. Protection for safety over current protection
Part 4-43. Protectionforsafety-Protectionagainstovercurrent
(IEC 60364-4-43.2008, IDT)
Issued on.2012-06-29
2013-05-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Table of Contents
Introduction Ⅲ
43 overcurrent protection 1
430.1 Scope 1
430.2 Normative references 1
430.3 General requirements 2
431 The circuit according to claim 2 characterized
Protection of 431.1 line conductor 2
431.2 Protection of the neutral conductor 2
431.3 in multiphase systems breaking and then connected to the neutral conductor 3
432 protection of electrical characteristics of 3
432.1 both prevent the overload current and short circuit current of the protective device 3
432.2 prevent electrical overload current protection 3
432.3 prevent electrical short-circuit current protection 3
432.4 protection of electrical characteristics 4
Overload protection 433 4
With 433.1 and overload protection of electrical conductors between 4
433.2 overload protection of electrical position 4
433.3 overload protection of electrical omitted 5
Overload protection 433.4 parallel conductors 5
434 Short-circuit protection 6
Determine the expected short-circuit current 6 434.1
434.2 location of electrical short-circuit protection 6
434.3 short-circuit protection is omitted 6
Short circuit protection 7 434.4 parallel conductors
434.5 short-circuit protection features 7
8 435 over with overload protection and short circuit protection between
435.1 appliances provided with a protection 8
435.2 provided respectively by separate electrical protection 8
436 properties to limit the use of power over current 9
Appendix A (informative) parallel conductor overcurrent protection 10
Annex B (informative) 433.1 condition (1) and (2) 14
Annex C (informative) overload protection of electrical position or omission 15
Annex D (informative) short-circuit protection position or omission 18
References 21
Figure A.1 m root parallel conductors each have electrical overload protection circuit (11)
Figure A.2 m parallel conductors share a root overload protection of electrical circuit 12
Figure A.3 at the beginning of the fault current flowing 13
Cs Action Figure A.4 protection of electrical current flowing after 13
Figure A.5 linkage protecting electrical Note 13
Conditions Figure B.1 433.1 (1) and condition (2) Explanation 14
Figure C.1 overload protective devices (P2) is not in the branch circuit (B) of the starting point (see 433.2.2a)) 15
Figure C.2 overload protective devices (P2) installed in no more than from the branch circuit (B) at the start of 3m (see 433.2.2b)) 15
Figure C.3 may be omitted overload protection instructions (see 433.3.1a), b) and d)) 16
Figure C.4 in IT systems can be omitted overload protection instructions 16
Figure D.1 short-circuit protection (P2) limited change in the branch on the way back to the location (see 434.2.1) 18
Figure D.2 installed in the branch circuit power supply side starting point of a short-circuit protective device P2 (see 434.2.2) 19
Figure D.3 For some applications, it can short-circuit protection of omission (see 434.3) 20
Table 43A conductor k value 8
Foreword
All technical content in this section is mandatory.
GB 16895 "Buildings (low voltage) electrical apparatus" is divided into five sections.
--- Part 1. Fundamental principles, assessment of general characteristics and definitions;
--- Part 4. Safety;
--- Part 5. Selection and erection of electrical equipment;
--- Part 6. Inspection;
--- Part 7. requirements for special installations or locations.
This section is part of the 4 GB 16895.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This Part replaces GB 16895.5-2000 "Electrical installations of buildings Part 4. Protection for safety Chapter 43. Protection against overcurrent."
This section identical with IEC 60364-4-43.2008 (3rd edition) "Low-voltage electrical installations - Part 4-43. Protection for safety over current
protection".
This part of IEC 60364-4-43.2008 (3rd edition) identical in technical content, but contains the following editorial changes.
--- Use the decimal symbol instead of decimal symbol ",". ",";
--- Deletion of the IEC standard "foreword";
--- IEC Standard Appendix E for other countries to apply the standards of the country note, regardless of the country, by deleting this section.
This part of the reg number and IEC 60364-4-43.2008 exactly.
The main part of this change is GB 16895.5-2000.
--- In the "Scope" Added information about flexible cable (see 430.1);
--- Entire standard in the "phase conductor" to "line conductors";
--- The IT system is not configured to require modification of the neutral injection (see 431.2.2);
--- Increase the neutral conductor harmonic current overload testing requirements (see 431.2.3);
--- Electrical short-circuit protection, increase closing and breaking short-circuit current capability requirements (see 432.3);
--- Increased clarification of information overload protection (see 433.1)
--- Overload protection does not need to expand the electrical requirements of the case (see 433.3.1);
--- Omitted to allow protection of electrical overload situation, we give more examples (see 433.3.3);
--- Expand unwanted electrical short-circuit protection requirements of the case (see 434.3);
--- Increase the short-circuit current rating of the busbar system requirements (see 434.5.3).
Consistency correspondence between this part of international documents and normative references of our files are as follows.
--- GB 7251.2-2006 Low-voltage switchgear and control equipment Part 2. busbar trunking systems (busways)
Particular requirements (IEC 60439-2.2000, IDT);
--- GB 10963 (all parts), electrical accessories for household and similar circuit breakers for overcurrent protection [IEC 60898 (all section
Minute)];
--- GB/T 13539.2-2008 Low-voltage fuses - Part 2. Supplementary requirements for full-time personnel fuse (mainly used
Industrial fuses) examples of standardized systems of fuses A to I (IEC 60269-2.2006, IDT);
--- GB 13539.3-2008 Low-voltage fuses - Part 3. unskilled personnel Supplementary requirements for fuses (mainly used
For household and similar fuses) examples of standardized systems of fuses A to F (IEC 60269-3.2006, IDT);
--- GB 14048.2-2008 Low-voltage switchgear and control equipment Part 2. Circuit breaker (IEC 60974-2.2006,
IDT);
--- GB 14048.9-2008 Low-voltage switchgear and control equipment Part 6-2. Multiple function equipment (equipment) control and protection
Switching devices (or equipment) (CSP) (IEC 60947-6-2. IDT);
--- Part 4-41 GB 16895.21-2004 Electrical installations of buildings. Protection for safety Protection against electric shock (IEC 60364-4-
41.2001, IDT);
--- GB 16917 (all parts) for household and similar uses overcurrent protection for residual current operated circuit breaker (RCBO)
[IEC 61009 (all parts)].
This part of the National Standardization Technical Committee of electrical building equipment (SAC/TC205) and focal points.
This section is responsible for drafting unit. electrical machines in Design and Research Institute.
The main drafters of this part. He Xiangkun, Wangzeng Yao, Huang Baosheng.
This part of the standard replaces the previous editions are.
--- GB 16895.5-2000.
Low-voltage electrical installations
Part 4-43. Protection for safety over current protection
43 overcurrent protection
430.1 Scope
This section provides the overcurrent protection requirements energized conductors.
This section describes the live conductors in the event of overload (see 433) and short-circuit (see 434) How to by one or more electrical protection
Automatically cut off power, but in accordance with the provisions of 436 of the overcurrent has restricted who at 433.3 (overload protection of electrical omitted) or
Conditions 434.3 (short-circuit protection is omitted) as its provisions are satisfied except by. This section also includes overload protection and short circuit protection
Cooperation between (see 435).
Note 1. When the fault may cause over current values with the overload value almost in line with the provisions of 433 of the charged conductor overload protection, but also can be considered
Such is the fault overcurrent protection.
Note 2. The requirements of this section does not consider outside influences.
Note 3. The protection of the conductor specified in this part do not have the protection of the conductor connected devices.
Note 4. the use of plug and power outlet to connect the device to a flexible cable fixture, does not fall within the scope of this part, so do not set the overcurrent protection
is compulsory.
Note 5. In this section, breaking does not mean isolation.
430.2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB 16895.6-2000 Electrical installations of buildings - Part 5. Selection and erection of electrical equipment - Chapter 52. Wiring systems (idt
IEC 60364-5-52.1993)
IEC 60269-2 Low-voltage fuses - Part 2. Supplementary requirements for full-time personnel fuse (fuse is mainly used for industrial
Control) sample standardized systems of fuses A to I (Low-voltageswitchgearandcontrolgearassemblies-Part 2. Parti-
cularrequirementsforbusbartrunkingsystems (busways))
IEC 60269-3 Low-voltage fuses - Part 3. unskilled personnel Supplementary requirements for fuses (mainly used for household and class
Like the use of fuses) examples of standardized systems of fuses A to F (Low-voltagefuses-Part 3. Supplementaryrequire-
mentsforfusesforusebyunskiledpersons (fusesmainlyforhouseholdandsimilarapplications) -
ExamplesofstandardizedsystemsoffusesAtoF)
IEC 60269-4 Low-voltage fuses - Part 4. Supplementary requirements for protection of semiconductor devices fuse body (Low-voltagefuses-
Part 4. Supplementaryrequirementsforfuses-linksfortheprotactionofsemiconductordevices)
Part 4-41 IEC 60364-4-41 low voltage electrical devices. safety Protection against electric shock (Low-voltageelectrical
instalations-Part 4-41. Protectionforsafety-Protetionagainstelectricshock)
IEC 60439-2 Low-voltage switchgear and control equipment Part 2. Particular requirements for busbar trunking systems (busways)
(Low-voltageswitchgearandcontrolgearassemblies-Part 2. Particularrequirementsforbusbartrun-
kingsystems (busways))
IEC 60947-2 Low-voltage switchgear and control equipment Part 2. Circuit Breakers (Low-voltageswitchgearandcon-
trolgear-Part 2. Circuit-breakers)
IEC 60947-3 Low-voltage switchgear and control equipment - Part 3. Switches, disconnectors, switch and fuse combination
(Low-voltageswitchgearandcontrolgear-Part 3. Switches, disconnectors, switch-disconnectorsand
fuse-combinationunits)
IEC 60947-6-2 Low-voltage switchgear and control equipment Part 6-2. Multiple function equipment (equipment) control and protection of electrical switches
(Equipment) (CPS) (Low-voltageswitchgearandcontrolgear-Part 6-2. Multiplefunctionequipment-
Controlandprotectiveswitchingdevices (orequipment) (CPS))
IEC 60724 Rated voltage 1kV (Um = 1.2kV) and 3kV (Um = 3.6kV) cable short-circuit temperature limits (Short-
circuittemperaturelimitsofelectriccableswithratedvoltagesof1kV (Um = 1.2kV) and3kV (Um =
3.6kV))
IEC 60898 (all parts), electrical accessories for household and similar overcurrent protection circuit breaker (Electricalaccessories-
Corcuit-breakersforovercurrentprotectionforhouseholdandsimilarinstalations)
IEC 61009 (all parts) for household and similar uses overcurrent protection for residual current operated circuit breaker (RCBO)
(Residualcurrentoperatedcircuit-breakerswithintegralovercurrentprotectionforhouseholdand
similaruses (RCBOs))
IEC 61534 (all parts) power bus system {(alparts), Powertracksystems}
430.3 General requirements
Protection of electrical circuit should cause the conductor overcurrent flowing through the insulation, connectors, terminals or conductor surrounding material damage or thermal effects
Dangerous mechanical effects before breaking any overcurrent.
431 in accordance with the requirements of the circuit characteristics
Protection of 431.1 line conductor
431.1.1 431.1.2 applies in addition to the case, all of the line conductors shall be provided with an overcurrent detection. In the overcurrent is detected, should be breaking
The conductor, but not necessarily breaking the other live conductors.
If a phase of breaking be dangerous, for example, three-phase motor, it should take appropriate precautions.
431.1.2 In TT or TN system is not configured for the neutral conductor powered by the line conductor loop, as long as they meet the following
Conditions are one of the line conductors do not need to be installed over-current detection.
a) in the same circuit or on the supply side, provided with unbalanced load detection and protection of all breaking the line conductor.
b) neutral conductor is not from a) in the protection of electrical load side circuit with an artificial neutral point.
431.2 Protection of the neutral conductor
431.2.1 TT or TN system
Where the cross-sectional area of the neutral conductor is at least equivalent to the cross-sectional area of the conductor line, and the current does not exceed the expected neutral conductor line conductor
Case of the current value, do not need to over-current detection on the neutral conductor or neutral conductor installation breaking appliances.
In the cross-sectional area of the neutral conductor cross-sectional area smaller than the line conductors are needed for a neutral conductor overcurrent detection, to suit the neutral
Sectional area of the conductor; this should be able to detect the breaking line conductors, but not breaking the neutral conductor.
In both cases, the neutral conductor should be short-circuit protection.
Note. This can be used to protect line conductor overcurrent protective devices to achieve. In this case, the neutral conductor overcurrent protection is not required or breaking in
Electrical conductor.
Neutral conductor current situation is expected to exceed the line conductor current value, see 431.2.3.
In addition to the neutral conductor breaking requirements, other requirements apply to the PEN conductor.
431.2.2 IT systems
In the case of the configuration of the neutral conductor, the neutral conductor of each circuit shall be provided with an overcurrent detection. Such protection should overcurrent detection
Breaking including the neutral conductor of the respective circuits including all live conductors. If you are following the case, the need for such measures.
--- Specific neutral conductor, it has been provided on the power supply side such as the protection of electrical electrical device into the line side for effective overcurrent protection
Protection, or
--- Specific circuit, which is composed of residual current operated protective devices to protect, and the electrical current does not exceed the residual operating neutral
0.2 times the carrying capacity of the conductor, the electrical conductors should be able to live off all points including the neutral conductor, including the corresponding circuit. That
All electrical poles should have adequate breaking capacity.
NOTE. It is strongly recommended that the system should not be configured in IT neutral conductor.
431.2.3 harmonic currents
In multi-phase circuit, the line current harmonic content resulting in a neutral conductor current is expected to exceed the carrying capacity of the conductor case,
The neutral conductor overload detection should be carried out, this should be through the overload detection current characteristics of the neutral line of coordination, and should only break points lead
Body without breaking the neutral conductor. In case of breaking the neutral conductor, must meet the requirements of 431.3.
NOTE. With regard to the protection of the neutral conductor further requirements are given in GB 16895.6 in.
431.3 breaking and re-closure in multi-phase systems the neutral conductor
In case of breaking the requirements of the neutral conductor, the breaking and re-closure should be to be disconnected before breaking conductor neutral conductor should not be online, and
Then you should turn on before or simultaneously with the conductor connecting line connected.
432 protection of electrical characteristics
Protective devices should have 432.1 ~ 432.3 points out the type.
432.1 both prevent overload current and short circuit current protection appliances
Except as specified in 434.5.1, both to prevent the overload current and short circuit current of the protective devices should include breaking its installation
Any over-current short-circuit current expected at including, for the circuit breaker should be able to turn on the current. Such appliances may be.
--- Both overload and short circuit two kinds of circuit breaker trip function;
--- Fuse in series with the circuit breaker;
--- Having a characteristic gG fuse fuse.
Note 1. The fuse comprises all components constitute the entire protective devices.
Note 2. If you are met at 433.1 and 434.5 of the requirements does not preclude the use of other protective devices.
432.2 prevent electrical overload current protection
These protective devices should meet the requirements of 433, and breaking capacity may be less than expected in the short-circuit current protection of electrical installation at.
Note 1. These appliances are usually inverse protection appliances.
Note 2. aM fuse does not protect the overload.
432.3 prevent electrical short-circuit current protection
Were only short-circuit current protection appliances shall be provided in other ways have been used to achieve overload protection or according to specification allows 433 is not installed
Let overload protection is required. Such appliances should have a breaking capacity of not less than at the installation, including its expected short-circuit current, the circuit-breaker
It should also be able to turn on not less than at the installation, including its expected short-circuit current. Such protective devices shall meet the requirements of 434.
Such appliances may be.
--- Only a short-circuit release function of the circuit breaker;
--- Use fuses gM, aM type fuse body.
432.4 protection of electrical characteristics
Overcurrent protection of electrical characteristics should comply with the relevant provisions within the following standards, such as GB 10963, GB 14048.2, GB 14048.9,
GB 16917, GB/T 13539.2, GB 13539.3, GB/T 13539.4 or GB 14048.3.
Note. does not preclude the use of other protective devices, it provided their time/current characteristic with a level of protection equivalent to these provisions.
433 Overload protection
With 433.1 and overload protection of electrical conductors between
To prevent the cable overload protection of electrical operating characteristics of the following two conditions should be met.
IB ≤In≤IZ (1)
I2 ≤1.45 × IZ (2)
Where.
IB --- circuit design current in amperes (A);
Length of cable ampacity IZ --- ampere (A) (see GB/T 16895.15);
In --- electrical protection rated current in amperes (A).
Note 1. For adjustable protective devices, the rated current is given In the current setting.
I2 --- guaranteed protection appliances at the appointed time and reliable operation of the current in amperes (A).
Ensure reliable operation of the numerical protection of electrical current I2 provided by the appliance manufacturer, or is given by the product standards.
In some cases, the installation of protection in accordance with this section may not guarantee play a protective role, such as. a sustained overcurrent and smaller
In the case of I2. In this case, it should consider selecting a larger cross-sectional area of the cable.
Note 2. IB through line conductor current design, or under the 3rd harmonic content is large continuous current through the neutral conductor.
Note 3. to ensure protection of electrical current within the agreed time and reliable operation, also may be referred to by the product It gives It or If. Both It and If
In is a multiple, but should pay attention to correctly represent their values and coefficients.
Note 4. 433.1 Conditions (1) and (2) a description, see Appendix B.
Note 5. After using the correction factor, design current IB can be regarded as the actual current Ia. See GB/T 16895.1-2008 311.
433.2 overload protection of electrical location
433.2.1 overload protective devices should be installed in the lead conductor ampacity reduction sites, such as the cross-sectional area, features, installation or knot
Change configuration at except 433.2.2 and 433.3 apply occasions.
433.2.2 If the wiring between the change of the (cross-sectional area, features, installation or structure) and protection of electrical installation at no sub-section
Branch circuit no power outlet, and at least one of the following two conditions are met, the electrical conductor overload protection, along the wiring
Line installation.
a) It is in accordance with the requirements of 434 short-circuit protection;
b) its length does not exceed 3m, we have managed to minimize the risk of a short circuit, and which enables installation of fire or danger to human
Minimized (see 434.2.1).
Note. The apparatus according to a) above, Figure C.1. Apparatus according to b) above, Figure C.2.
433.3 overload protection of electrical omitted
This section does not apply to the various situations provided having a risk of fire or explosion hazard in the electrical device or provides for different conditions
And places special device required.
433.3.1 Overview
Without the need for installation of the following overload protection appliances.
a) are provided on the load side conductor cross-sectional area, features, or structural changes at the installation, the overload protection of the electrical power supply side
Effective protector.
b) less likely to overload a conductor 434 in accordance with the requirements of a short-circuit protection, and it has neither nor branch circuit
Power outlet.
c) means of line-side equipment into the line side of the switchboard there are electrical overload protection, and it can take into account the end of the line and total device
Device section between distribution point to provide protection, while the total points of distribution circuit has adopted the following overload protection.
d) telecommunications, control, signal circuits and similar circuits.
Note. according to a), b) and d) of the installation, shown in Figure C.3.
433.3.2 electrical overload protection in IT system location or omitted
433.3.2.1 on overload protective devices fitted or omitted provisions 433.2.2 and 433.3.1, and does not apply to IT systems,
Unless there is no over-load protection circuit for each one to take the following protective measures.
a) to take protective measures in 412 GB 16895.21 provisions;
b) each circuit are used for residual current operated protective devices to protect in the event of failure of the second immediate action;
c) For use only insulation monitoring continuous monitoring system using one of the following two measures.
--- At the 1st division off circuit failure; or
--- Give a signal indicative of the failure. Troubleshooting according to operational requirements, and determine the second failure risk.
NOTE. It is recommended in accordance with IEC 61557-9, installation, insulation fault location system. Since the application of such a system, without interrupting the power supply, you can check
Measuring and determining the insulation fault location.
433.3.2.2 If each circuit are the installation of a residual current operated protective devices, in the absence of neutral conductor IT system, in the
Phase conductors one phase may be omitted overload protection appliances.
433.3.3 For security reasons, you should consider the protection of electrical overload omitted occasions
Accidental disconnection of electrical equipment for power supply circuit may cause dangerous or damaging situations, allowing you to omit the circuit overload prote...
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