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GB 7251.6-2015: [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 7251.6: Historical versions
Similar standardsGB 7251.6-2015: [GB/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/GB7251.6-2015 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). Drafting organizations of this Part. Tianjin Electric Drive Design Institute Co., Ltd., Tianjin Tianchuan Electric Control Power Distribution Co., Ltd., State Electric Power Distribution Equipment Quality Supervision and Inspection Center, Daquan Group Co., Ltd., Yuyao Electric Power Equipment Factory, China Quality Certification Center, Guangzhou Radius Power Copper Material Co., Ltd., Jiangsu Huapeng Intelligent Electric Co., Ltd., Gansu Electric Apparatus Research Institute, Chengdu Ke Xing Electric Appliance Co., Ltd., Zhenjiang Product Quality Supervision and Inspection Center, Zhuhai Guangle Electric Power Busway Co., Ltd., Jilin Longding Electric Co., Ltd., Zhenjiang Siemens Bus Co., Ltd., Jiangsu Jiangcheng Electric Co., Ltd. Main drafters of this Part. Wang Yang, Zhang Lei, Cui Jing, Liu Jie, Duan Yi, Wang Sha, Zhang Qing, Pei Jun, Xia Huijun, Chen Xin, Chen Jian, Chen Qingzhou, Hu Mingxin, Xiao Rong, Ding Zhidong, Lei Qinghua, Li Yan, Li Fei and Chen Dingxuan. The previous edition of the standards replaced by this Part are as follows. - GB 7251.2-1997, GB 7251.2-2006. 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.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. This clause of GB 7251.1-2013 is applicable except as follows. Addition. GB 7251.1-2013 Low-voltage switchgear and controlgear assemblies - Part 1.General rules (IEC 61439-1.2011, IDT) GB/T 18380.31-2008 Tests on electric and optical fibre cables under fire conditions - Part 3-10.Test for vertical flame spread of vertically-mounted bunched wires or cables - Apparatus (IEC 60332-3-10.2000, IDT)3 Terms and definitionsThis clause of GB 7251.1-2013 is applicable except as follows. Additional definitions. 3.101 busbar trunking system; BTS 3.102 busbar trunking unit; BTU Unit of a BTS complete with busbars, their supports and insulation, external enclosure and any fixing and connecting means to other units, with or without tap-off facilities. 3.103 busbar trunking run; BT run Number of BTUs connected together to form the BTS, excluding the tap-off units. 3.106 busbar trunking adapter unit; adapter BTU BTU intended to connect two units of the same system but of different type or of different rated current. 3.107 busbar trunking thermal expansion unit; thermal expansion BTU BTU intended to permit a certain movement in the axial direction of the BT run due to thermal expansion of the system. 3.110 busbar trunking feeder unit; feeder BTU BTU serving as an incoming unit.4 Symbols and abbreviationsThis clause of GB 7251.1-2013 is applicable except as follows. Addition.5 Interface characteristicsThis clause of GB 7251.1-2013 is applicable except as follows. 5.1 General Replacement. The characteristics of the BTS shall ensure compatibility with the ratings of the circuits to which it is connected and the installation conditions and shall be declared by the BTS manufacturer using the criteria identified in 5.2 to 5.6 and 5.101 to 5.102. 5.2.4 Rated impulse withstand voltage (Uimp) (of the ASSEMBLY) Replacement of the NOTE. 5.3.1 Rated current of the ASSEMBLY (InA) Addition. 5.3.2 Rated current of a circuit (Inc) Addition. The rated current of each circuit (i.e. incoming unit, BTU, tap-off unit, outgoing circuit) shall be equal to or higher than its assumed loading. For tap-off units provided with more than one main outgoing circuit, see also 5.4. The rated current shall apply for specified mounting conditions. Mounting conditions may include orientation and position, as follows. 5.4 Rated diversity factor (RDF) Replacement. For the whole BTS, unless otherwise specified, the RDF (see 3.8.11 of GB 7251.1- 2013) shall be equal to 1, i.e. all tap-off units can be continuously and simultaneously loaded with their full rated current, within the limit of the rated current of the BT run(s) and feeder BTU(s). 5.102 Electromagnetic field The strength of the power frequency magnetic field in the vicinity of the BT run may be stated by the BTS manufacturer.6 InformationThis clause of GB 7251.1-2013 is applicable except as follows. 6.1 ASSEMBLY designation marking Addition after the first paragraph.7 Service conditionsThis clause of GB 7251.1-2013 is applicable except as follows. 7.2 Special service conditions Addition.8 Constructional requirementsThis clause of GB 7251.1-2013 is applicable except as follows. 8.1.5 Mechanical strength Addition after the last paragraph. 8.1.101 Ability to withstand mechanical loads BTS intended for horizontal installation shall be able to withstand in use normal or heavy mechanical loads as specified according to 5.6 aa). 8.1.102 Ability of plug-in tap-off units to withstand thermal variations Plug-in tap-off units in which the contact force is developed by the deflection of a spring member shall be able to withstand the mechanical constraints due to temperature variations when subjected to intermittent duty. 8.2.1 Protection against mechanical impact Replacement. Where a degree of protection against mechanical impact according to GB/T 20138 IK code is declared by the original manufacturer, the BTS shall be so designed that it is capable of withstanding the test according to GB/T 20138 IK code (see 10.2.6). 8.5.2 Removable parts Replacement of the third paragraph. A removable part may be fitted with a device, which ensures that it can only be removed and inserted after its main circuit has been switched off from the load. Addition. 8.5.5 Accessibility This subclause of GB 7251.1-2013 is not applicable. Additional subclause. 8.6.101 Correct connection between BTS units BTUs shall be so designed as to ensure correct connection between the conductors of adjacent units forming a BTS (power circuits, auxiliary and communication circuits, PE...).9 Performance requirementsThis clause of GB 7251.1-2013 is applicable except as follows. 9.2 Temperature rise limits Replacement of footnote d in Table 6 of GB 7251.1-2013. d Unless otherwise specified, in the case of covers and enclosures, which are accessible but need not be touched during normal operation, a 25 K increase on these temperature-rise limits for metal surfaces and a 15 K increase on these temperature-rise limits for insulating material surfaces are permissible. Additional subclauses. 9.101 Resistance to flame propagation A non-flame-propagating BTS either shall not ignite or, if ignited, shall not continue to burn when the source of ignition is removed. Compliance is checked by the flame-propagation tests according to 10.101. ......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 7251.6-2015 be delivered?Answer: The full copy PDF of English version of GB 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 7251.6-2015_English with my colleagues?Answer: Yes. The purchased PDF of GB 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. 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