GB/T 7251.5-2025 Active National standards

GB/T 7251.5-2025 Low-voltage switchgear and controlgear assemblies—Part 5:Assemblies for power distribution in public networks

Publish Date: 2025-12-02 Implement Date: 2026-07-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: GB/T 7251.5-2025

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Low-voltage distribution electrical equipment

ICS Name: Low-voltage switchgear and controllers

Publish Date: 2025-12-02

Implement Date: 2026-07-01

Pages: 40 pages

Scope

This document specifies the specific requirements for public power grid distribution switchgear (PENDA).
PENDA meets the following requirements:
——For power distribution in three-phase systems with a rated voltage not exceeding AC 1,000 V (see Figure 101 for a typical distribution network) and DC systems with a rated voltage not exceeding DC 1,500 V;
——Fixed-type;
——Open-type switchgear is not included in this document;
——Suitable for installation in locations accessible only to skilled technicians, and outdoor installations may be located in areas accessible to the general public:
● Intended for energy distribution in public power grids;
● Indoor use: switchgear installed in power substations;
● Outdoor use: suitable for open-air installation of switchgear with enclosures.
This document aims to define and specify the requirements for PENDA, including usage conditions, structural requirements, technical characteristics, and testing. For certain grid parameters, higher-performance testing may be conducted.
PENDA may include control and/or signaling devices associated with energy distribution.
Note 1: Control and monitoring devices may be used in smart grid applications or for the transmission of smart grid data.
This document applies to all PENDA designed for one-time use, manufactured, or fully standardized batch production.
The manufacturer of the products may not be the original manufacturer (see GB/T 7251.1—2023, Section 3.10.1).
This document does not apply to individual devices and assembled components that comply with relevant product standards, such as motor starters, fuse-type switches, electronic equipment, etc.
If the substation is owned or operated by a distribution system operator (DSO), PENDA used as low-voltage distribution panels in power substations falls within the scope of this document.
This document does not apply to spe

Development Information

Word Count: 57 Thousand words Pages: 40 pages

Same series standard

GB/T 7251.7-2025 Low-voltage switchgear and controlgear assemblies—Part 7:Assemblies for specific applications such as marinas,camping sites,market squares,electric vehicle charging stations GB/T 7251.10-2025 Low-voltage switchgear and controlgear assemblies—Part 10:Guidance to specifying assemblies

Replace the following standards

GB/T 7251.5-2017 Low-voltage switchgear and controlgear assemblies—Part 5:Assemblies for power distribution in public networks

Referenced Standards

GB/T 2423.2-2008 Environmental testing for electric and electronic products—Part 2:Test methods—Tests B:Dry heat GB/T 2423.4-2008 Environmental testing for electric and electronic products—Part 2:Test method—Test Db:Damp heat,cyclic(12 h+12 h cycle) GB/T 2423.17-2008 Environmental testing for electric and electronic products—Part 2:Test methods—Test Ka:Salt mist GB/T 4025-2010 Basic and safety principles for man-machine interface,marking and identification—Coding principles for indicators and actuators GB/T 4026-2019 Basic and safety principles for man-machine interface,marking and identification—Identification of equipment terminals,conductor terminations and conductors GB/T 4205-2010 Basic and safety principles for man-machine interface(MMI),marking and identification—Actuating principles GB/T 5094.1-2018 Industrial systems,installations and equipment and industrial products—Structuring principles and reference designations—Part 1:Basic rules GB/T 5169.10-2017 Fire hazard testing for electric and electronic products—Part 10:Glowing/hot-wire based test methods—Glow-wire apparatus and common test procedure GB/T 5169.11-2017 Fire hazard testing for electric and electronic products—Part 11:Glowing/hot-wire based test methods—Glow-wire flammability test method for end-products(GWEPT) GB/T 11021-2014 Electrical insulation—Thermal evaluation and designation GB/T 16895.6-2014 Low-voltage electrical installations—Part 5-52:Selection and erection of electrical equipment—Wiring systems GB/T 16895.18-2010 Electrical installations of buildings—Part 5-51:Selection and erection of electrical equipment—Common rules GB/T 16935.1-2008 Insulation coordination for equipment within low-voltage systems—Part 1:Principles,requirements and tests GB/T 17626.4-2018 Electromagnetic compatibility—Testing and measurement techniques—Electrical fast transient/burstimmunity test GB/T 17626.6-2017 Electromagnetic compatibility—Testing and measurement techniques—Immunity to conducted disturbances,induced by radio-frequency fields GB/T 17627-2019 High-voltage test techniques for low-voltage equipment—Definitions,test and procedure requirements,test equipment GB 17799.3-2012 Electromagnetic compatibility(EMC)—Generic standards—Emission standard for residential, commercial and light-industrial environments GB/T 20641-2014 Empty enclosures for low-voltage switchgear and controlgear assemblies—General requirements GB/T 24276-2017 A method of temperature-rise verification of low-voltage switchgear and controlgear assemblies by calculation GB/T 35698.1-2017 Calculation of effects of short-circuit currents—Part 1:Definitions and calculation methods ISO 178:2019 ISO 179-1:2010 ISO 179-2:2020 ISO 2409 ISO 4628-3:2016 ISO 4892-2:2013 ISO 7010 IEC 60364(所有部分) IEC 60364-1 IEC 60364-4-41:2005 IEC 60364-4-41:2005/AMD1:2017 IEC 60529:1989 IEC 60529:1989/AMD1:1999 IEC 60529:1989/AMD2:2013 IEC 60695-2-12 IEC 60947-4-1:2018 IEC 61000-4-2:2008 IEC 61000-4-3:2020 IEC 61000-4-5:2014 IEC 61000-4-5:2014/AMD1:2017 IEC 61000-4-8:2009 IEC 61000-4-11:2020 IEC 61000-6-4:2018 IEC 61082-1:2014 IEC 61439(所有部分) IEC 61921:2017 IEC 81346-2:2019 CISPR 11:2015 CISPR 11:2015/AMD1:2016 CISPR 11:2015/AMD2:2019 CISPR 32:2015 CISPR 32:2015/AMD1:2019 GB/T 5169.16-2017 Fire hazard testing for electric and electronic products—Part 16:Test flames—50 W horizontal and vertical flame test methods GB/T 7251.1-2023 Low-voltage switchgear and controlgear assemblies—Part 1:General rules GB/T 19292.1-2018 Corrosion of metals and alloys—Corrosivity of atmospheres—Part 1:Classification,determination and estimation IEC 62262 ISO 6506-1:2014

Adopt standards

IEC 61439-5:2023

Related Standards

GB 7251.2-1997 Replaced

GB 7251.2-1997 Low-voltage switchgear and control gear assemblies—Part 2:Particular requirements for busbar trunking systems(busways)

Publish Date: 1997-12-30

GB/T 11022-1999 Replaced

GB/T 11022-1999 Common specifications for high-voltage switchgear and control gear standards

Publish Date: 1999-10-10

GB/T 18858.1-2002 Replaced

GB/T 18858.1-2002 Low-voltage switchgear and control gear Controller-device interface(CDIs)—Part 1:General rules

Publish Date: 2002-10-08

GB/T 18858.3-2002 Replaced

GB/T 18858.3-2002 Low-voltage switchgear and control gear—Controller-Device interface(CDI)—Part 3:Device Net

Publish Date: 2002-10-08

GB/Z 18859-2002 Replaced

GB/Z 18859-2002 Enclosed low-voltage switchgear and controlgear Assemblies—Guide for testing under conditions of arcing due to internal fault

Publish Date: 2002-10-08

GB 14048.4-2003 Replaced

GB 14048.4-2003 Low-voltage switchgear and controlgear—Electromechanical contactors and motor-starters

Publish Date: 2003-09-10