GB/T 32350.1-2025 Active National standards

GB/T 32350.1-2025 Railway applications—Insulation coordination—Part 1:Basic requirements—Clearances and creepage distances for all electrical and electronic equipment

GB/T 32350.1-2025 Railway applications—Insulation coordination—Part 1:Basic requirements—Clearances and creepage distances for all electrical and electronic equipment

Publish Date: 2025-12-31 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 32350.1-2025

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Basic standards and general methods

ICS Name: Railway vehicles

Publish Date: 2025-12-31

Implement Date: 2026-07-01

Pages: 52 pages

Scope

This document specifies the insulation coordination in rail transit applications, applicable to signal equipment, locomotive and vehicle equipment, and ground equipment.
Insulation coordination refers to the selection, dimensioning, and interrelationships of insulation between equipment and within equipment components. When determining insulation dimensions, electrical stress and environmental conditions are taken into account. When electrical stress and environmental conditions are the same, the determined insulation dimensions are also the same.
The purpose of insulation coordination is to avoid unnecessarily excessive insulation dimensions.
This document specifies:
—— The electrical clearance and creepage distance requirements of equipment;
—— The general requirements for insulation coordination tests.
The term "equipment" in the above refers to the "parts" in 3.3, which can apply to systems, subsystems, equipment, parts of equipment, or a physical implementation of equipotential lines.
This document does not cover:
—— Insulation distances through solids or liquids;
—— Insulation distances through gases other than air;
—— Insulation distances through air under non-standard atmospheric pressure;
—— Equipment used under extreme conditions.
This document is the basic standard for product standards.

Development Information

Word Count: 84 Thousand words Pages: 52 pages

Same series standard

GB/T 32350.2-2025 Railway applications—Insulation coordination—Part 2:Overvoltages and related protection

Replace the following standards

GB/T 32350.1-2015 Railway applications—Insulation coordination—Part 1:Basic requirements—Clearances and creepage distances for all electrical and electronic equipment

Referenced Standards

GB 311.1-1997 Insulation co-ordination for high voltage transmission and distribution equipment GB/T 311.1-2012 Insulation co-ordination—Part 1:Definitions,principles and rules GB/T 1402-2010 Railway applications—Supply voltages of traction systems GB/T 4207-2003 Method for determining the comparative and the proof tracking indices of solid insulating materials under moist conditions GB/T 4207-2012 Method for the determination of the proof and the comparative tracking indices of solid insulating materials GB/T 4207-2022 Method for the determination of the proof and the comparative tracking indices of solid insulating materials GB/T 6553-2003 Test methods for evaluating resistance to tracking and erosion of electrical insulating materials used under severe ambient conditions GB/T 6553-2014 Electrical insulating materials used under severe ambient conditions—Test methods for evaluating resistance to tracking and erosion GB/T 6553-2024 Electrical insulating materials used under severe ambient conditions—Test methods for evaluating resistance to tracking and erosion GB/T 16927.1-1997 High-voltage test techniques Part 1:General test requirements GB/T 16927.1-2011 High-voltage test techniques—Part 1:General definitions and test requirements GB/T 16935.1-2023 Insulation coordination for equipment within low-voltage supply systems—Part 1:Principles, requirements and tests GB/T 24338.1-2009 Railway applications—Electromagnetic compatibility—Part 1:General GB/T 24338.1-2018 Railway applications—Electromagnetic compatibility—Part 1:General GB/T 24338.2-2011 Railway applications—Electromagnetic compatibility—Part 2:Emission of the whole railway system to the outside world GB/T 24338.2-2018 Railway applications—Electromagnetic compatibility—Part 2:Emission of the whole railway system to the outside world GB/T 24338.3-2009 Railway applications—Electromagnetic compatibility—Part 3-1:Rolling stock—Train and complete vehicle GB/T 24338.3-2018 Railway applications—Electromagnetic compatibility—Part 3-1:Rolling stock—Train and complete vehicle GB/T 24338.4-2009 Railway applications—Electromagnetic compatibility—Part 3-2:Rolling stock—Apparatus GB/T 24338.4-2018 Railway applications—Electromagnetic compatibility—Part 3-2:Rolling stock—Apparatus GB/T 24338.5-2009 Railway applications—Electromagnetic compatibility—Part 4:Emission and immunity of the signalling and telecommunications apparatus GB/T 24338.5-2018 Railway applications—Electromagnetic compatibility—Part 4:Emission and immunity of the signalling and telecommunications apparatus GB/T 24338.6-2009 Railway applications—Electromagnetic compatibility—Part 5:Emission and immunity of fixed power supply installations and apparatus GB/T 24338.6-2018 Railway applications—Electromagnetic compatibility—Part 5:Emission and immunity of fixed power supply apparatus and systems GB/T 24338.2-2018 Railway applications—Electromagnetic compatibility—Part 2:Emission of the whole railway system to the outside world GB/T 24338.3-2018 Railway applications—Electromagnetic compatibility—Part 3-1:Rolling stock—Train and complete vehicle GB/T 24338.4-2018 Railway applications—Electromagnetic compatibility—Part 3-2:Rolling stock—Apparatus GB/T 24338.5-2018 Railway applications—Electromagnetic compatibility—Part 4:Emission and immunity of the signalling and telecommunications apparatus GB/T 24338.6-2018 Railway applications—Electromagnetic compatibility—Part 5:Emission and immunity of fixed power supply apparatus and systems GB/T 25120-2023 Railway applications—Traction transformers and inductors on board rolling stock GB/T 25890.1-2010 Railway applications—Fixed installations—DC switchgear—Part 1:General IEC 60071-2:2023

Adopt standards

IEC 62497-1:2010

Related Standards

GB/T 4952-1985 Abolished

GB/T 4952-1985 Coupler connection contour for locomotives and cars

Publish Date: 1985-03-06

GB/T 5599-1985 Replaced

GB/T 5599-1985 Railway vehicles—Specification for evaluation the dynamic performance and accreditation test

Publish Date: 1985-11-25

GB/T 8601-1988 Replaced

GB/T 8601-1988 Rolled solid wheels for railway

Publish Date: 1988-01-07

GB/T 8602-1988 Active

GB/T 8602-1988 Rough-rolled tyres for railway

Publish Date: 1988-01-07

GB/T 10082-1996 Replaced

GB/T 10082-1996 Technical requirements of heavy duty railway motor trolley

Publish Date: 1996-10-09

GB/T 17425-1998 abolished_transferred

GB/T 17425-1998 Purchase and acceptance of couplers and coupler yokes for freight service

Publish Date: 1998-07-06