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GB 16895.5-2012 English PDF

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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
Status: Valid

GB 16895.5: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB 16895.5-2012	709	Add to Cart	5 days	[GB/T 16895.5-2012] Low-voltage electrical installations -- Part 4-43: Protection for safety -- Protection against overcurrent	Valid
GB 16895.5-2000	319	Add to Cart	3 days	Electrical installations of buildings-Part 4: Protection for safety-Chapter 43: Protection against overcurrent	Obsolete

Similar standards

GB/T 16895.19 GB/T 16895.18 GB 17945 GB/T 16895.3 GB/T 16895.13 GB/T 16895.7

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Older Standard (superseded by this standard): GB 16895.5-2000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

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 ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB 16895.5-2012_English be delivered?

Answer: Upon your order, we will start to translate GB 16895.5-2012_English as soon as possible, and keep you informed of the progress. The lead time is typically 3 ~ 5 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB 16895.5-2012_English with my colleagues?

Answer: Yes. The purchased PDF of GB 16895.5-2012_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version GB 16895.5-2012?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB 16895.5-2012 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.