Home Cart Quotation About-Us
www.ChineseStandard.net
SEARCH

GB/T 7251.3-2017 English PDF

US$399.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 7251.3-2017: Low-voltage switchgear and controlgear assemblies -- Part 3: Distribution boards intended to be operated by ordinary persons (DBO)
Status: Valid

GB/T 7251.3: Historical versions

Standard IDUSDBUY PDFLead-DaysStandard Title (Description)Status
GB/T 7251.3-2017399 Add to Cart 3 days Low-voltage switchgear and controlgear assemblies -- Part 3: Distribution boards intended to be operated by ordinary persons (DBO) Valid
GB 7251.3-2006519 Add to Cart 3 days [GB/T 7251.3-2006] Low-voltage switchgear and controlgear assemblies -- Part 3: Particular requirements for low-voltage switchgear and controlgear assemblies intended to be installed in places where unskilled persons have access for their use -- Distribut Obsolete
GB 7251.3-1997479 Add to Cart 3 days Low-voltage switchgear and controlgear assemblies. Part 3: Particular requirements for low-voltage switchgear and controlgear assemblies intended to be installed in places where unskilled persons have access for their use--Distribution boards Obsolete

Similar standards

GB/T 7251.1   GB/T 7251.2   GB 7251.1   GB/T 7251.7   GB/T 7251.10   GB/T 7251.8   

Basic data

Standard ID: GB/T 7251.3-2017 (GB/T7251.3-2017)
Description (Translated English): Low-voltage switchgear and controlgear assemblies -- Part 3: Distribution boards intended to be operated by ordinary persons (DBO)
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: K31
Classification of International Standard: 29.130.20
Word Count Estimation: 20,233
Date of Issue: 2017-11-01
Date of Implementation: 2018-05-01
Older Standard (superseded by this standard): GB/T 7251.3-2006
Regulation (derived from): National Standard Announcement 2017 No. 29
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

GB/T 7251.3-2017: Low-voltage switchgear and controlgear assemblies -- Part 3: Distribution boards intended to be operated by ordinary persons (DBO)


---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 switchgear and controlgear assemblies-Part 3. Distribution boardsintended to be operated by ordinary persons(DBO) ICS 29.130.20 K31 National Standards of People's Republic of China Replace GB/T 7251.3-2006 Low-voltage switchgear and control equipment Part 3. Operation by general personnel Power distribution board (DBO) Low-voltageswitchgearandcontrolgearassemblies-Part 3.Distributionboards (IEC 61439-3.2012, IDT) Released.2017-11-01 2018-05-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Administration issued

Content

Foreword III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 2 4 symbols and abbreviations 2 5 Interface Features 2 6 Information 3 7 Conditions of use 3 8 Structural requirements 3 9 Performance requirements 5 10 Design Verification 5 11 routine test 7 Appendix 10 Appendix D (informative) Design Verification 11 Appendix AA (informative) Agreement between manufacturer and user of complete equipment 12 Reference 16 Figure 101 Example 9 of temperature rise verification for the entire DBO test in 10.10.2.3.6 Table 101 Calculated load value 7 Table 102 Tightening torques used to verify mechanical strength 8 Table AA.1 Agreement between manufacturer and user of the complete equipment item 12

Foreword

GB/T 7251 "Low-voltage switchgear and control equipment" is divided into the following parts. --- Part 1. General; --- Part 3. Switchboards (DBO) operated by general personnel; --- Part 4. Special requirements for complete sets of equipment for construction sites (ACS); --- Part 5. Electrical power distribution equipment for public utilities; --- Part 6. Busbar trunking system (busbar trunking); --- Part 7. Complete sets of equipment for specific applications---such as docks, campsites, market squares, electric vehicle charging stations; --- Part 8. General technical requirements for intelligent complete sets of equipment; --- Part 10. Guidelines for specifying complete sets of equipment; --- Part 12. Complete sets of power switches and control equipment. This part is the third part of GB/T 7251. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 7251.3-2006 "Low-voltage switchgear and control equipment Part 3. For non-professionals Low-voltage switchgear and control equipment entering the site---Special requirements for switchboards, compared with GB/T 7251.3-2006 The changes are as follows. --- The structure and technical parts are adjusted according to GB/T 7251.1-2013. This section is used in conjunction with GB/T 7251.1-2013. The general provisions of GB/T 7251.1-2013 are only applicable to this section. The scope of the reference. If the chapters and bars, tables, figures and appendices of the General Regulations are applied, they are indicated by reference to GB/T 7251.1-2013, for example, 1.2.3 of GB/T 7251.1-2013, Table 4 of GB/T 7251.1-2013, or Appendix A of GB/T 7251.1-2013. Articles with numbers 101, 102, 103, etc. are additional terms of the same clause in GB/T 7251.1-2013. The new tables and diagrams in this section are counted starting from 101. The new appendices in this section are named after the letters AA, BB, etc. This part uses the translation method equivalent to IEC 61439-3.2012 "Low-voltage switchgear and control equipment Part 3. by general Personnel operated switchboard (DBO). The documents of our country that have a consistent correspondence with the international documents referenced in this part are as follows. GB/T 2423.55-2006 Environmental testing for electric and electronic products - Part 2. Test methods Test Eh. Hammer test (IEC 60068-2-75.1997, IDT); --- GB/T 10963.1-2005 Electrical accessories - Use of overcurrent protection circuit breakers for household and similar . Part 1. Flow circuit breaker (IEC 60898-1.2002, IDT); ---GB/T 22794-2008 B-type residual current operated circuit breaker without and with overcurrent protection for household and similar purposes (Type B RCCB and Type B RCBO) (IEC 62423..2007, IDT). This section has made the following editorial changes. --- This section is included in the contents of the international standard amendments. This part was proposed by China Electrical Equipment Industry Association. This part is under the jurisdiction of the National Low Voltage Switchgear and Control Equipment Standardization Technical Committee (SAC/TC266). This section drafted by. Tianjin Electric Science Research Institute Co., Ltd., Tianjin Tianchuan Electric Control Distribution Co., Ltd., national electronic control power distribution equipment Quality Supervision and Inspection Center (Tianjin Tianchuan Electronic Control Equipment Testing Co., Ltd.), Zhenjiang Product Quality Supervision and Inspection Center, Fujian Senda Electric Stock Co., Ltd. Co., Ltd., Far East Electric Group Co., Ltd., Zhejiang Fangyuan Electric Equipment Testing Co., Ltd., Hangzhou Jiuchuan Electric Co., Ltd., Shandong Lu Yitong Intelligent Electric Co., Ltd., Chengdu Product Quality Supervision and Inspection Institute, Borui Electric Co., Ltd., Hunan Electric Apparatus Research Institute, Zhejiang Bao Electric (Hangzhou) Group Co., Ltd., Ningbo Qiao Electric Technology Group Co., Ltd., Shenzhen Guanghui Electric Industrial Co., Ltd., Ningxia Li Cheng Electric Group Co., Ltd. The main drafters of this section. Liu Jie, Wang Yang, Lu Lin, Cui Weifeng, Chen Zeyin, Li Shirong, Huang Fang, Liu Xiaolin, Xu Kefeng, Feng Wei, Zhu Wentang, Chen Kefu, Lin Bibao, Feng Qunxia, Cai Zongguang, Niu Guangjun. The previous versions of the standards replaced by this section are. ---GB 7251.3-1997, GB/T 7251.3-2006. Low-voltage switchgear and control equipment Part 3. Operation by general personnel Power distribution board (DBO)

1 Scope

This part of GB/T 7251 defines the specific requirements of the switchboard (DBO) operated by the general personnel. DBO has the following conditions. --- intended to be operated by general personnel (such as switching operations and replacement fuses), for example in civilian (home) applications; ---Outgoing circuit contains protection devices that are intended to be operated by ordinary personnel and meet the following standards, such as IEC 60898-1, IEC 61008, IEC 61009, IEC 62423 and IEC 60269-3; ---The rated voltage to the ground does not exceed 300V AC; --- The rated current (Inc) of the outgoing circuit does not exceed 125A and the rated current (InA) of the DBO does not exceed 250A; --- intended to be used for power distribution; ---Closed, fixed installation; --- For indoor or outdoor use. The DBO can include control and/or signaling devices associated with power distribution. This section applies to all DBOs, whether they are designed, manufactured and validated at one time, or fully standardized for mass production. The DBO can be assembled outside of the original manufacturer's factory. This section does not apply to individual devices and self-contained components that comply with their respective product standards, such as circuit breakers, knife fuse switches, and electronic components. Prepare. This section does not apply to specific types of equipment included in other parts of GB/T 7251.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. Chapter 2 of GB/T 7251.1-2013 is applicable except as follows. increase. GB/T 7251.1-2013 Low-voltage switchgear and control equipment - Part 1. General (IEC 61439-1.2011, IDT) IEC 60068-2-75 Environmental test Part 2. Test test Eh. Hammer test (Environmental testing-Part 2. Tests-TestEh. Hammertests) IEC 60269-3 Low-voltage fuses - Part 3. Supplementary requirements for fuses for unskilled personnel (mainly for households and Fuse-like fuses) - Standardized fuse system examples A to F [Low-voltagefuses-Part 3. Supplementaryrequire- Mentsforfusesforusebyunskiledpersons(fusesmainlyforhouseholdandsimilarapplications)- ExamplesofstandardizedsystemsoffusesAtoF] IEC 60898-1.2010 Electrical accessories - Electrical protection for household and similar applications - Part 1 [Electricalaccessories-Circuit-breakersforovercurrentprotectionforhouseholdandsimilarin- stalations-Part 1. Circuit-breakersfora.c.operation] IEC 61008 (all parts) Residual current operated circuit breakers (RCCB) without overcurrent protection for household and similar purposes [Re- Sidualcurrentoperatedcircuit-breakerswithoutintegralovercurrentprotectionforhouseholdandsim- Ilaruses(RCCBs)(alparts)] IEC 61009 (all parts) Residual current operated circuit breakers (RCBO) with overcurrent protection for household and similar purposes [Residualcurrentoperatedcircuit-breakerswithintegralovercurrentprotectionforhouseholdand Similaruses(RCBOs)(alparts)] IEC 62423.2009 Type F and Type B residual current operated circuit breakers without and with overcurrent protection for household and similar purposes [TypeFandtypeBresidualcurrentoperatedcircuit-breakerswithandwithoutintegralovercurrent Protectionforhouseholdandsimilaruses]

3 Terms and definitions

Chapter 3 of GB/T 7251.1-2013 is applicable except as follows. 3.1 General terms Increase the terminology. 3.1.101 Distribution board (DBO) operated by general personnel distributionboardintendedtobeoperatedbyordinarypersons (DBO) A complete set of equipment intended to be operated by general personnel to distribute electrical energy for civilian (home) applications and other locations. Note. Switch operation and replacement fuses are examples of operation by the average person. 3.1.102 Type A DBO typeADBO Designed as a DBO with a monopolar device. Note. In the UK, it is mainly used for civil (home) equipment, and the maximum incoming unit rating is 100A and the maximum outlet unit rating is 63A. DBO is considered a "user unit" or "user switchboard." 3.1.103 Type B DBO typeBDBO Designed as a DBO with multipole and/or unipolar devices.

4 symbols and abbreviations

Chapter 4 of GB/T 7251.1-2013 is applicable.

5 interface characteristics

Chapter 5 of GB/T 7251.1-2013 is applicable except as follows. 5.1 General increase. This goal can be achieved in one of two typical steps. the user can select a product in a catalog that meets the user's requirements, or The manufacturer reached a specific agreement. In both cases, according to the detailed list in Appendix AA, the user can be provided with all the data he needs to specify and help. The manufacturer depicts the actual DBO. In some cases, the information given by the DBO manufacturer can replace the agreement. 5.2.4 rated impulse withstand voltage (Uimp) (for complete equipment) Replace. The rated impulse withstand voltage shall be equal to or higher than the specified value of the transient overvoltage present in the electrical system to which the circuit is intended to be connected. According to Table G.1 of Appendix G of GB/T 7251.1-2013, DBO shall comply at least with overvoltage category III (see IEC 60364-4-44). 5.4 Rated dispersion coefficient (RDF) increase. DBO's outgoing circuit or outlet circuit group calculation when there is no agreement between the DBO manufacturer and the user on the actual load current The load can be based on the values of Table 101. 5.6 Other features increase. q) Type A or Type B DBO (see 3.1.102 and 3.1.103).

6 information

Chapter 6 of GB/T 7251.1-2013 is applicable except as follows. 6.1 Flags specified in the complete set of equipment Increase to the first paragraph. The test of 10.2.7 is only applicable to DBOs intended for outdoor installation. Note. In Germany and Sweden, 10.2.7 also applies to DBOs intended to be installed indoors. Add the following new items. e) The rated current of the DBO uses the symbol InA, such as InA250A; f) Degree of protection if higher than IP2XC.

7 Conditions of use

Chapter 7 of GB/T 7251.1-2013 is applicable except as follows. 7.1.3 Pollution level increase. Minimum pollution level 2 applies.

8 structural requirements

Except for the following, Chapter 8 of GB/T 7251.1-2013 is applicable. 8.2.1 Protection against mechanical collisions Replace. In accordance with IEC 62262, DBOs shall comply with the following IK codes. ---The DBO used indoors is IK05. --- Outdoor use DBO is IK07. Compliance shall be verified in accordance with 10.2.6. Note. In the United States, the IK code is not required because the requirements for the "type" tag apply (see Note 1 of 8.2.2 of GB/T 7251.1-2013) contain the IK code. Consideration. 8.2.2 Prevent access to live parts and the entry of solid foreign bodies and water Replace the second paragraph. After installation in accordance with the DBO manufacturer's instructions, the DBO installed in the home should have a degree of protection of at least IP2XC. 8.4.6.2.5 Barrier This clause of GB/T 7251.1-2013 does not apply. 8.5.3 Selection of switching devices and components increase. The outgoing circuit shall contain protection devices intended to be operated by ordinary personnel and comply with the following standards, such as IEC 60898-1, IEC 61008, IEC 61009, IEC 62423 and IEC 60269-3. When the DBO is loaded with a device that does not meet the above criteria, the re-closure of the incoming line protection device requires a key or tool. Can also be used The label indicates that the device can be reclosed only by trained personnel or skilled technicians. This label should be placed in the line protection device. nearby. The design or installation of the circuit breaker shall not change its setting or scale value, including the use of keys or tools, and cause A significant change in its setting or scale value. When the incoming line protection device incorporated in the DBO contains a fuse that does not comply with the IEC 60269-3 fuse link, it is required when replacing the fuse link Want a key or a tool. Note. In Norway, the protection devices in the outlet units used for wiring protection in buildings should comply with IEC 60898-1, IEC 61008, IEC 61009, IEC 60269-3 or IEC 60947-2, except Type 6.10.1 of IEC 60898-1.2001 or Type 9.9.2.1 of IEC 61009-1.2010, Type B, Type C and In addition to the D-type time current characteristic test, the requirements of all other tests of IEC 60898-1 or IEC 61009 are to be met. 8.6.1 Main circuit Replace the second paragraph. Each conductor between the incoming unit and the outgoing unit and between the components contained within the unit, as long as the arrangement of the conductors is such that Under normal operating conditions, internal short circuits do not occur between phases and/or phase to ground (see 8.6.4 of GB/T 7251.1-2013). The rated data is selected based on the short-circuit stress after the attenuation of the load end of each outgoing short-circuit protection device. increase. Note. UK Electricity, Safety and Quality Regulation SI2002 No. 2965 requires the power supply department to state the maximum expected short-circuit current at the power supply. In the UK, powered by According to the power association's publication, page 25, the maximum expected short-circuit current of the power supply terminals of household and similar electrical equipment is up to 100A. The single phase power supply is 16kA. 8.8 External wire terminal increase. The number of DBO neutral terminals should be no less than one terminal for each outgoing circuit that requires a neutral terminal. Placement of these terminals or The marking shall be in the same order as its phase conductor terminals. The DBO shall have at least two terminals for the electrical equipment protection junction conductor. Note. In the United States, the neutral conductor is marked in white and the grounded protective conductor can be identified by green/yellow or pure green.

9 Performance requirements

Chapter 9 of GB/T 7251.1-2013 is applicable. 10 Design verification Chapter 10 of GB/T 7251.1-2013 is applicable except as follows. 10.2.2.2 Severe Test A increase. The following is an alternative test. A component or representative sample of the steel casing of the DBO to be tested, in cold chemistry such as trichloroethane or refined gasoline Soak for 10 min in the degreaser to remove all lubricant. Place the part in a 10% ammonium chloride aqueous solution at a temperature of (20 ± 5) °C. Soak for 10min. Without drying, after all the water droplets have been removed, the parts are placed in a container filled with saturated steam at a temperature of (20 ± 5) ° C for 10 min. The parts were placed in a heating oven at a temperature of (100 ± 5) °C for 10 minutes, and after being placed at room temperature for 24 hours, the surface should be free of rust. Rust marks on the sharp edges and all yellow marks that can be wiped off are negligible. For small coil springs and the like, as well as inaccessible wear parts, a layer of lubricant provides adequate rust protection. Such department The test is only carried out when there is doubt about the effectiveness of the lubricant film, and the test should not remove the original lubricant. 10.2.2.4 Test results The first paragraph of GB/T 7251.1-2013 does not apply to alternative tests in this section. 10.2.3.2 Verification of abnormal heating and ignition caused by internal electrical effects of insulating materials The last paragraph of GB/T 7251.1-2013 does not apply. increase. Note. 850 °C is not suitable for accessible parts of the outer casing installed in the concave wall, such as the cover plate and the door. 10.2.6 Mechanical collision Replace. The verification of the degree of mechanical collision protection shall be carried out in accordance with IEC 62262. The test shall be carried out by means of a hammer test apparatus as described in IEC 60068-2-75, such as an impact spring hammer. Sample placed during indoor use At -5 °C ± 1K temperature, the sample was placed at -25 °C ± 1K temperature for outdoor use, and after 2 hours, the test was carried out. When installed in normal use, the bare parts of the DBO that may be subject to mechanical impact should be checked for compliance with this requirement. Samples with a cover or casing, if any, should be fixed or placed against a rigid support as normal. Three impacts should be applied to different parts of each accessible face and door (if any). The impact should be evenly distributed on the surface of the test enclosure on. Under no circumstances should an impact be applied around the same point on the outer casing. Sample unless the previous test did not affect the subsequent test results Reusable, new samples should be used for each accessible face. Do not deal with knockout holes, internal components that meet other standards, or Other fastening devices that are impacted and placed in depressions below the surface perform an impact. Cable entries that do not have a knockout hole should be open. If you have a knockout hole, you should open two of them. Prior to the impact, the set screws of the pedestal, superstrate, and the like were applied with the same torque as specified in Table 102......
Image     

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 7251.3-2017_English be delivered?

Answer: Upon your order, we will start to translate GB/T 7251.3-2017_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 7251.3-2017_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 7251.3-2017_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/T 7251.3-2017?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 7251.3-2017 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.