GB/T 7251.6-2015 PDF EnglishUS$145.00 · In stock · Download in 9 seconds
GB/T 7251.6-2015: Low-voltage switchgear and controlgear assemblies -- Part 6: Busbar trunking systems (busways) Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 7251.6: Historical versions
Similar standardsGB/T 7251.6-2015: Low-voltage switchgear and controlgear assemblies -- Part 6: Busbar trunking systems (busways)---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT7251.6-2015 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 29.130.20 K 31 GB/T 7251.6-2015 Replacing GB 7251.2-2006 Low-voltage switchgear and controlgear assemblies - Part 6.Busbar trunking systems (busways) Issued on: MAY 15, 2015 Implemented on: JUNE 1, 2016 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 6 3 Terms and definitions... 6 4 Symbols and abbreviations... 9 5 Interface characteristics... 9 6 Information... 14 7 Service conditions... 15 8 Constructional requirements... 15 9 Performance requirements... 17 10 Design verifications... 18 11 Routine verifications... 35 Annexes... 36 Annex C (informative) Specification schedule... 37 Annex D (informative) Design verification... 43 Annex AA (informative) Voltage drop of the system... 45 Annex BB (informative) Phase conductor characteristics... 46 Annex CC (informative) Fault-loop zero-sequence impedances... 49 Annex DD (informative) Fault-loop resistances and reactances... 52 Annex EE (informative) Determination of the magnetic field in the vicinity of the BTS ... 55 Bibliography... 57ForewordClauses 6, 8, 9, 10, 11 and Annexes A, B, F, G, J, K, N of this Part are mandatory, the rest are recommended. The following parts are intended to be published under the general title of GB 7251 “Low-voltage switchgear and controlgear assemblies”. - Part 1.General rules; - Part 2.Power switchgear and controlgear assemblies; - Part 3.Distribution boards (DBO) operated by unskilled persons; - Part 4.Particular requirements for assemblies for construction sites (ACS); - Part 5.Assemblies for power distribution in public networks; - Part 6.Busbar trunking systems (busways); - Part 7.Assemblies for specific applications such as marinas, camping sites, market squares, electric vehicles charging stations; - Part 10.Guidance to specifying assemblies. ... This Part is Part 6 of GB7251. This Part is drafted in accordance with the rules given in GB/T 1.1-2009. This Part replaces GB 7251.2-2006 “Low-voltage switchgear and controlgear assemblies - Part 2.Particular requirements for busbar trunking systems (busways)”; compared with GB 7251.2-2006, the main technical changes are as follows. - ADJUST the parts about the structure and technical content in GB 7251.1; - INTRODUCE the corresponding new verification method; - MODIFY the conflict between the measurement and calculation of resistance, reactance and impedance. This Part is proposed by China Electrical Equipment Industry Association. This Part shall be under the jurisdiction of National Technical Committee on Low- voltage Switchgear and Controlgear Assemblies of Standardization Administration of China (SAC/TC 266). Low-voltage switchgear and controlgear assemblies - Part 6.Busbar trunking systems (busways)1 ScopeNOTE 1.Throughout this Part, the abbreviation BTS is used for a busbar trunking system. Where reference to Part 1 is made, the term ASSEMBLY therefore reads as “BTS”. This Part of GB 7251 lays down the definitions and states the service conditions, construction requirements, technical characteristics and verification requirements for low voltage BTS (see 3.101) as follows. - BTS for which the rated voltage does not exceed 1 000 V in case of a.c. or 1 500 V in case of d.c.; - BTS intended for use in connection with the generation, transmission, distribution and conversion of electric energy, and for the control of electric energy consuming equipment; - BTS designed for use under special service conditions, for example in ships, in rail vehicles, and for domestic applications (operated by unskilled persons), provided that the relevant specific requirements are complied with; NOTE 2.Supplementary requirements for BTS in ships are covered by IEC 60092-302. - BTS designed for electrical equipment of machines. Supplementary requirements for BTS forming part of a machine are covered by the IEC 60204 series. This Part applies to all BTS whether they are designed, manufactured and verified on a one-off basis or fully standardized and manufactured in quantity. The manufacture and/or assembly may be carried out by a manufacturer other than the original manufacturer (see 3.10.1 and 3.10.2 of GB 7251.1-2013). This Part does not apply to individual devices and self-contained components, such as motor starters, fuse switches, electronic equipment, etc. which will comply with the relevant product standard. This Part does not apply to the specific types of ASSEMBLIES covered by other parts of the GB 7251 series, to supply track systems in accordance with GB 13961-2008, to cable trunking and ducting systems in accordance with the GB/T 19215 series, nor to power track systems in accordance with the IEC 61534 series. 10.2.101.3 Resistance of the enclosure to crushing A straight BTU shall be subjected to a crushing force, successively at four or more points, including one point between adjacent insulators, if any. The BTU shall be supported horizontally on a flat surface and the force shall be applied through a rigid plate equal to the width of the BTU and 120 mm long. The crushing force shall at least be equal to 4 times the weight of 1 m length, for BTS stated for normal mechanical loads; a mass of 90 kg shall be added for BTS stated for heavy mechanical loads. The duration of the test shall be at least 5 min per point. 10.2.101.4 Results to be obtained During and after the tests according to 10.2.101.1 to 10.2.101.3, there shall be neither break, nor permanent deformation of the enclosure which would compromise the degree of protection, reduce the clearances and creepage distances to values lower than those specified in 8.3, or impair the correct insertion of incoming and outgoing units. The protective circuit shall remain functional and the test samples shall withstand the dielectric test according to 10.9.2 of GB 7251.1-2013. 10.2.102 Thermal cycling test 10.2.102.1 General Plug-in tap-off units shall be submitted to a thermal cycling test. 10.2.102.2 Test sample If the same design of the plug assembly is used for a range of tap-off units of different rated currents or of different protective devices, a test on one combination of a BTU and a tap-off unit is considered to be representative of the range. The design of the plug assembly includes the physical characteristics and the material and surface finish (e.g. plating), if applicable. A tap-off unit incorporating fuses shall be fitted with the maximum size of fuses specified by the original manufacturer. A tap-off unit incorporating a circuit-breaker shall be fitted with a circuit-breaker of the maximum rating specified by the original manufacturer. The tap-off unit shall be arranged and loaded as in 10.10.2.3.6. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 7251.6-2015 be delivered?Answer: The full copy PDF of English version of GB/T 7251.6-2015 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 7251.6-2015_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 7251.6-2015_English will be deemed to be sold to your employer/organization who actually paid 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+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 7251.6-2015 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds.Question 5: Should I purchase the latest version GB/T 7251.6-2015?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 7251.6-2015 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.How to buy and download a true PDF of English version of GB/T 7251.6-2015?A step-by-step guide to download PDF of GB/T 7251.6-2015_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).Step 2: Search keyword "GB/T 7251.6-2015". Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart. Step 4: Select payment option (Via payment agents Stripe or PayPal). Step 5: Customize Tax Invoice -- Fill up your email etc. Step 6: Click "Checkout". Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively. Step 8: Optional -- Go to download PDF. Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice. See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9 |
