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GB/T 24275-2019Low-voltage fixed connection enclosed switchgear and controlgear assemblies (English PDF)

低压固定封闭式成套开关设备和控制设备

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

October 18, 2019

Implementation date

May 1, 2020

Scope

GB/T 24275-2019 is the English-translated version of 低压固定封闭式成套开关设备和控制设备.

GB/T 24275-2019 is the Chinese standard "Low-voltage fixed connection enclosed switchgear and controlgear assemblies". Its scope clause reads: This standard specifies the classification, use conditions, structure and performance of low-voltage fixed-enclosed switchgear and control equipment (set of equipment).

Requirements, design verification, routine inspection, information and packaging, transportation and storage.

This standard applies to rated voltage AC not exceeding 1000V or rated voltage DC not exceeding 1500V, as electric energy distribution, electric Low-voltage switchgear and control equipment for indoor or outdoor work with machine control, line protection, and closed structure with fixed connection.

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Document preview — GB/T 24275-2019

National Standard of the People's Republic of China

ICS: 29.130.20
Classification: K 31
Replacing: GB/T 24275-2009

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword
1 Scope
2 Normative references
3 Terms and Definitions
4 Category
4.1 Enclosure Type
4.2 Use place
4.3 Protection level
4.4 Equipment installation surface
5 Conditions of use
5.1 Normal use conditions
5.2 Special use conditions
5.3 Transportation, storage and installation conditions
6 Structural requirements
6.1 Material and component strength
6.2 Size
6.3 Cabinet structure
6.4 Protection level of the complete equipment enclosure
6.5 Clearance and creepage distance
6.6 Electric shock protection
6.7 Selection and installation of switching devices and components
6.8 Internal Circuits and Connections
6.9 External lead terminal
7 Performance requirements
7.1 Dielectric properties
7.2 Temperature rise
7.3 Short circuit protection and short circuit withstand strength
7.4 Electromagnetic Compatibility (EMC)
8 Design Verification
8.1 General
8.2 Verification of material and component strength
8.3 Protection level verification (IP code)
8.4 Clearance and creepage distance verification
8.5 Electric shock protection and protection circuit continuity verification
8.6 Switching device and component combination
8.7 Internal Circuits and Connections
8.8 External lead terminal
8.9 Dielectric performance verification
8.10 Verification of the temperature rise limit
8.11 Short-circuit withstand strength verification
8.12 Electromagnetic Compatibility Test
8.13 Mechanical Operation Test
9 routine inspections
9.1 General
9.2 Degree of protection of the enclosure
9.3 Clearance and creepage distance
9.4 Protection against electric shock and protection of circuit integrity
9.5 Combination of built-in components
9.6 Internal Circuits and Connections
9.7 External lead terminal
9.8 Mechanical operation
9.9 Dielectric performance
9.10 Wiring, Operational Performance and Features
10 Information
10.1 Sign
10.2 User Manual
10.3 Identification of devices and/or components
11 Packaging, transport and storage
11.1 Packaging and Transportation
11.2 Attached materials and documents when packing
11.3 Storage

1 Scope

This standard specifies the classification, use conditions, structure and performance of low-voltage fixed-enclosed switchgear and control equipment (set of equipment).

Requirements, design verification, routine inspection, information and packaging, transportation and storage.

This standard applies to rated voltage AC not exceeding 1000V or rated voltage DC not exceeding 1500V, as electric energy distribution, electric

Low-voltage switchgear and control equipment for indoor or outdoor work with machine control, line protection, and closed structure with fixed connection.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document.

For undated references, the latest edition (including all amendments) applies to this document.

GB/T 4025 Human Machine Interface Marker Identification Basic and Safety Rule Indicators and Operator Code Encoding Rules

GB/T 4205 Human Machine Interface Marking Logo Basic and Safety Rules Operating Rules

GB/T 4208 enclosure protection grade (IP code)

GB/T 7251.1-2013 Low-voltage switchgear and control equipment - Part 1. General

GB/T 7251.12-2013 Low-voltage switchgear and control equipment - Part 2. Complete sets of power switches and control equipment

GB/T 5169.5 Fire hazard testing for electric and electronic products - Part 5. Tests

Test methods and guidelines

General technical conditions for GB/T 13384 mechanical and electrical product packaging

GB/T 16895.21 Low-voltage electrical installations - Part 4-41. Protection against electric shock

GB/T 17626.2 Electromagnetic compatibility test and measurement technology Electrostatic discharge immunity test

GB/T 17626.3 Electromagnetic compatibility test and measurement technology RF electromagnetic field radiation immunity test

GB/T 17626.4 Electromagnetic compatibility test and measurement technology Electrical fast transient burst immunity test

GB/T 17626.5 Electromagnetic compatibility test and measurement technology Surge (impact) immunity test

GB/T 17626.6 Electromagnetic compatibility test and measurement technology Conducted disturbance immunity of RF field induction

GB/T 17626.8 Electromagnetic compatibility test and measurement technology power frequency magnetic field immunity test

GB/T 17626.11 Electromagnetic compatibility test and measurement techniques Immunity test for voltage dips, short interruptions and voltage changes

GB/T 17626.13 Electromagnetic compatibility test and measurement technology AC power port harmonics, interharmonics and low frequency impedance of grid signals

Disturbance test

GB/T 20138 Protection level of external mechanical collision of electrical equipment casing (IK code)

GB/T 20641-2014 General requirements for empty housings for low-voltage switchgear and control equipment

IEC 60085 Electrical insulation heat resistance assessment and design grading (Electricalinsulation-Thermalevaluationand

Designation)

IEC 60216 (all parts) Electrical insulation materials heat resistance [Electricalinsulatingmaterials-Propertiesof

Thermalendurance(alparts)]

IEC 60364 low voltage electrical installations (all parts) [Low-voltageelectricalinstalations (alparts)]

IEC 60364-5-52 Low-voltage electrical installations - Part 5-52. Selection and installation of electrical equipment (Low-voltage […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 33 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 7251.12-2013 · IEC 60085 · IEC 60216 · IEC 60364 · IEC 60364-5-52

Similar standards

GB/T 33346-2025|GB/Z 14048.24-2024|GB/T 10217-2021|GB/T 7251.8-2020|GB/T 24274-2019|GB/T 22686-2008

Editions of GB/T 24275

Edition	Title	Revision	Status
GB/T 24275-2019	Low-voltage fixed connection enclosed switchgear and controlgear assemblies	current edition	Current
GB/T 24275-2009	Low-voltage fixed connection enclosed switchgear and controlgear assemblies	previous edition	Superseded

This page sells the current edition, GB/T 24275-2019. Earlier editions are listed for reference only.

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