GB/T 16935.3-2025Insulation coordination for equipment within low-voltage systems - Part 3: Use of coating, potting or moulding for protection against pollution (English PDF)
低压系统内设备的绝缘配合 第3部分：利用涂层、罐封和模压进行防污保护
Also coversGB/T16935.3-2025 + GBT16935.3-2025
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
October 5, 2025
Implementation date
May 1, 2026
Scope
GB/T 16935.3-2025 is the English-translated version of 低压系统内设备的绝缘配合 第3部分：利用涂层、罐封和模压进行防污保护.
This part of the insulation coordination series deals with the use of coatings, potting and moulding as a means of protecting insulation against pollution in equipment used within low-voltage systems. It is relevant to designers of electrical and electronic assemblies, printed board and enclosure engineers, and test laboratories that must show an insulation design holds up in contaminated environments. Instead of relying only on larger clearances and creepage distances, a designer may choose to seal or encapsulate the insulating surfaces, and this document addresses that route.
The standard was issued on 5 October 2025 and takes effect on 1 May 2026, replacing GB/T 16935.3-2016. It is a recommended national standard, so its application is voluntary unless a product specification, contract or regulation calls it up. Anyone maintaining technical files that cite the 2016 edition should check which edition their customers and certification bodies now expect.
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Document preview — GB/T 16935.3-2025
National Standard of the People's Republic of China
- ICS
- 29.120
- Classification
- K 30
- Replacing
- GB/T 16935.3-2016
Issued by: State Administration for Market Regulation; Standardization Administration of China
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
Foreword
GB/T 16935.3-2025 is a recommended national standard (GB/T) of the People's Republic of China, issued on 5 October 2025 by the State Administration for Market Regulation and the Standardization Administration of China, with effect from 1 May 2026.
This edition replaces GB/T 16935.3-2016.
The document adopts an international standard (ISO or IEC).
It is under the responsibility of the China Electrical Equipment Industry Association.
Classification: ICS 29.120; CCS K 30.
1 Scope
This part of the insulation coordination series deals with the use of coatings, potting and moulding as a means of protecting insulation against pollution in equipment used within low-voltage systems. It is relevant to designers of electrical and electronic assemblies, printed board and enclosure engineers, and test laboratories that must show an insulation design holds up in contaminated environments. Instead of relying only on larger clearances and creepage distances, a designer may choose to seal or encapsulate the insulating surfaces, and this document addresses that route.
The standard was issued on 5 October 2025 and takes effect on 1 May 2026, replacing GB/T 16935.3-2016. It is a recommended national standard, so its application is voluntary unless a product specification, contract or regulation calls it up. Anyone maintaining technical files that cite the 2016 edition should check which edition their customers and certification bodies now expect.
Remaining clauses in the full document
- 2 Normative references
- 3 Terms and definitions
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 17 pages — is available in the English PDF.
Referenced standards
Cited by
- GB/T 3883.405-2025Safety of motor-operated hand-held, transportable and garden tools - Part 405: Particular requirements for grass shears
- GB/T 46746-2025Insulation fault locating devices for marine low-voltage power systems
- GB/T 37408-2019Technical requirements for photovoltaic gird-connected inverter
- GB 30439.7-2014Safety requirements for industrial automation products-Part 7: Safety requirements for loop regulator
- GB 30439.8-2014Safety requirements for industrial automation products-Part 8: Safety requirements for electrical actuator
- GB 30439.9-2014Safety requirements for industrial automation products-Part 9: Safety requirements for digit display instrument
Editions of GB/T 16935.3
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 16935.3-2025 | Insulation coordination for equipment within low-voltage systems - Part 3: Use of coating, potting or moulding for protection against pollution | current edition | Current |
| GB/T 16935.3-2016 | Insulation coordination for equipment within low-voltage systems - Part 3: Use of coating, potting or moulding for protection against pollution | previous edition | In force until 1 May 2026 |
This page sells the current edition, GB/T 16935.3-2025. Earlier editions are listed for reference only.
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Related Standards
GB/T 16935.1-2023 — Insulation coordination for equipment within low-voltage supply systems - Part 1: Principles, requirements and tests
GB/T 16935.3-2016 — Insulation coordination for equipment within low-voltage systems -- Part 3: Use of coating, potting or moulding for protection against pollution
GB/T 16935.4-2011 — Insulation coordination for equipment within low-voltage systems -- Part 4: Consideration of high-frequency voltage stress
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