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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
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GB/T 16935.3-2025	English	434	Add to Cart	4 days [Need to translate]	Insulation coordination for equipment within low-voltage systems - Part 3: Use of coating, potting or moulding for protection against pollution
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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

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ICS 29.120 CCSK30 National Standards of the People's Republic of China Replaces GB/T 16935.3-2016 Insulation coordination of equipment in low-voltage systems Part 3.Utilizing Coating, Sealing, and Molding Protect against contamination (IEC 60664-3.2016, IDT) Published on 2025-10-05 Implemented on May 1, 2026 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Table of contents

Preface III Introduction IV 1.Scope 1 2 Normative References 1 3.Terms and Definitions 2 4 Design Requirements 3 4.1 General Rules 3 4.2 Applicable to relevant environments 3 4.3 Requirements for Protection Type 3 4.4 Dimension Determination Procedure 3 5.Experiment 4 5.1 General Requirements 4 5.2 Samples for coating test 5 5.3 Samples for molding and canning tests 5 5.4 Preparation of Test Samples 5 5.5 Visual Inspection 5 5.6 Scratch Resistance Test 5 5.7 Pretreatment of Test Samples 6 5.8 Mechanical and electrical tests after pretreatment and electromigration 8 5.9 Additional Tests 9 Appendix A (Normative) Test Procedure 10 Appendix B (Normative) Contents determined by each technical committee 12 B.1 Overview 12 B.2 Content to be determined by the relevant technical committee 12 B.3 Optional Test Conditions 12 Appendix C (Normative) Printed Circuit Boards for Coating Testing 13 C.1 Overview 13 C.2 Specifications for Printed Circuit Boards 13 C.3 Arrangement of Conductors 13 C.4 Arrangement of connecting plates 13 C.5 Connection of the test 14 References 16 Figure 1.Scratch resistance test of the protective layer 6 Figure C.1 Structure of the test sample 14 Figure C.2 Structure of the connecting disk and adjacent conductors 15 Table 1 Minimum Spacing for Type 2 Protection 4 Table 2 Dry heat pretreatment 7 Table 3 Severity Level of Rapid Temperature Changes 7 Table A.1 Test Procedure 1 10 Table A.2 Experimental Procedure 2 Pretreatment Related to Electromigration 11 Table A.3 Additional Test 11

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document is Part 3 of GB/T (Z) 16935.GB/T (Z) 16935 has the following parts published. ---Insulation Coordination of Equipment in Low-Voltage Power Supply Systems - Part 1.Principles, Requirements and Tests (GB/T 16935.1); ---Insulation Coordination of Equipment in Low-Voltage Systems Part 2-1.Application Guidelines GB/T 16935 Series Application Explanation, Dimensional Examples and dielectric test (GB /Z 16935.2); ---Insulation Coordination of Equipment in Low-Voltage Systems Part 2-2.Application Guidelines for Interface Considerations (GB /Z 16935.6); ---Insulation coordination for equipment in low-voltage systems - Part 3.Protection against contamination by coating, sealing and molding (GB/T 16935.3); ---Insulation Coordination of Equipment in Low-Voltage Systems - Part 4.Considerations for High-Frequency Voltage Stress (GB/T 16935.4); ---Insulation Coordination of Equipment in Low-Voltage Systems - Part 5.Methods for Determining Clearances and Creepage Distances Not Exceeding 2 mm (GB/T 16935.5). This document replaces GB/T 16935.3-2016 "Insulation Coordination of Equipment in Low-Voltage Systems - Part 3.Utilization of Coatings, Canning and Molding" Compared with GB/T 16935.3-2016, the main technical changes in "Protection against Pollution" are as follows, apart from structural adjustments and editorial modifications. ---The definitions of the terms "printed board" and "solid insulation" have been changed (see 3.2 and 3.6,.2016 editions of 3.2 and 3.6); ---The "Scratch Resistance Test" has been expanded to include a requirement that only Type 2 protectors undergo a scratch resistance test. This test should be performed before the sequential testing of Type 2 protectors. The test samples should undergo a scratch resistance test (see 5.6); ---Added to "Dry Heat". Allows the use of interpolation to determine the maximum working surface temperature and corresponding pretreatment temperature in Table 2 (see...) 5.7.3); ---The number of cycles in "Rapid Temperature Changes" has been changed from 5 to 50 (see 5.7.4, 5.7.3 in the.2016 version); ---The "General Test Conditions" section adds clause 5.8.3, stipulating that tests should be conducted in a temperature and humidity chamber; and clauses 5.8.4 and 5.8.5, stipulating that tests should be conducted after the sample has been removed from the chamber. Perform within 1 hour after removal from the temperature and humidity chamber (see 5.8.1); ---Change "AC withstand voltage test" to "voltage test" and add Type 1 protection impulse voltage test (see 5.8.4,.2016). Version 5.8.4); ---The original flowchart has been deleted, and Tables A.1, A.2, and A.3 have been added (see Appendix B, Appendix A of the.2016 edition). This document is equivalent to IEC 60664-3.2016 "Insulation coordination of equipment in low-voltage systems - Part 3.Utilization of coatings, seals and molds". Pressurize for anti-fouling protection. The following minimal editorial changes have been made to this document. ---Since there are no references in the main text, IEC Guide 104.2019 and ISO /IEC Guide 51 in Chapter 2 have been moved to the references. This document was proposed by the China Electrical Equipment Industry Association. This document is under the jurisdiction of the National Technical Committee on Standardization of Insulation Coordination for Low-Voltage Equipment (SAC/TC417). This document was drafted by. Shanghai Electrical Apparatus Research Institute, Hebei University of Technology, Wuxi Xinlinhua Technology Co., Ltd., and Shanghai Electrical Apparatus Research Institute. Research Institute (Group) Co., Ltd. The main drafters of this document are. Chen Xueqin, Wang Jingqin, Qian Xiaohao, and Huang Jingye. The release history of this document and the document it replaces is as follows. ---First published in.2005 as GB/T 16935.3-2005, and revised for the first time in.2016; ---This is the second revision.

Introduction

This document specifies the conditions applicable to rigid components (such as printed circuit boards and component terminals) under which the electrical properties of the components... Clearance and creepage distance can be reduced. Contamination protection can be achieved using any form of encapsulation (e.g., coating, can sealing, or molding). This protection can... It is applied to one or both sides of the component. This document specifies the insulation properties of the protective material. The requirements for clearances and creepage distances in IEC 60664-1 apply between any two unprotected conductive parts. This document only covers permanent protection and does not apply to repaired components. The relevant product standards take into account the impact on the protection of overheated conductors and components, especially under fault conditions, and determine whether it is necessary. Additional requirements. For protection system applications, the safety performance of components depends on a precise and controlled manufacturing process. Quality control requirements, for example... Sampling tests should be considered in the standards for each product. GB/T 16935, "Insulation Coordination of Equipment in Low-Voltage Systems," is the fundamental standard guiding the insulation coordination of equipment in low-voltage systems. It is proposed that... It consists of 6 parts. ---Part 1.Principles, Requirements, and Tests. The purpose is to provide guidance to product technical standards committees regarding insulation coordination. Materials can ensure the safe use of low-voltage system equipment, improve the reliability level of insulation coordination, and standardize production and usage practices. Guidelines. ---Part 2-1.Application Guidelines GB/T 16935 Series. Application Explanation, Size Examples, and Dielectric Testing. The purpose is to provide technical... When committees and manufacturers apply the GB/T 16935 series of standards, they should emphasize the application of this series of standards and enhance their understanding of them. understand. ---Part 2-2.Interface Considerations Application Guidelines. The purpose is to provide guidance for technical committees in considering interfaces related to insulation coordination. Provide general basic guidelines for handling interface issues. ---Part 3.Contamination Protection Using Coatings, Canning Seals, and Molding. The purpose is to specify the methods for protection using coatings, canning seals, and molding. Insulation coordination requirements and test procedures for pollution-protected components. ---Part 4.High-Frequency Voltage Stress Considerations. The purpose is to summarize some of the most important considerations regarding high-frequency insulation stress. Data is used to explain the impact of high-frequency insulation stress on insulating materials and their dimensions, and to specify clearances, creepage distances, and solid insulation requirements. The data is presented, along with experimental methods for high-frequency stress. ---Part 5.Methods for determining electrical clearances and creepage distances not exceeding 2 mm. The purpose is to specify the requirements for printed circuit boards and similar... Method for determining the dimensions of electrical clearances and creepage distances not exceeding 2mm in similar structural components. Insulation coordination of equipment in low-voltage systems Part 3.Utilizing Coating, Sealing, and Molding Protect against contamination

1 Scope

This document applies to components that utilize coatings, canning, and molding for antifouling protection, where the electrical clearances and creepage distances can be less than [specific values would be required]. Electrical clearances and creepage distances as specified in IEC 60664-1. This document specifies the requirements and test procedures for two types of protection. ---Type 1 protection for improving the microenvironment of the protected component; ---Similar to Type 2 protection for solid insulation. This document also applies to various types of protected printed circuit boards, including the inner layer surfaces of multilayer printed circuit boards, substrates, and similar protected components. For multilayer printed circuit boards, the relevant requirements for the spacing of an inner layer are included in the solid insulation requirements of IEC 60664-1. Note. For example, the substrate can be made using hybrid integrated circuits and thick film technology. This document pertains to permanent protection only and does not apply to components that can be mechanically adjusted and repaired. The principles in this document apply to functional insulation, basic insulation, supplementary insulation, and reinforced insulation.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included. For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. This document. GB/T 16935.1-2023 Insulation Coordination of Equipment in Low-Voltage Power Supply Systems - Part 1.Principles, Requirements and Tests (IEC 60664-1.2020, IDT) Note. There are no technical differences between the content referenced in GB/T 16935.1-2023 and the content referenced in IEC 60664-1.2007. Part 2-1.Tests - Test A. Cold) Note. GB/T 2423.1-2008 Environmental testing for electrical and electronic products – Part 2.Test methods – Test A. Low temperature (IEC 60068-2-1.2007, IDT) Part 2-2.Tests - Test B. Dryheat) Note. GB/T 2423.2-2008 Environmental testing for electrical and electronic products – Part 2.Test methods – Test B. High temperature (IEC 60068-2-2.2007, IDT) Part 2-14.Tests-TestN.Changeoftemperature) Note. GB/T 2423.22-2012 Environmental testing - Part 2.Test methods - Test N. Temperature variation (IEC 60068-2-14.2009, IDT) IEC 60068-2-78 Environmental testing – Part 2-78.Tests (Cab). Constant humidity and heat test Note. GB/T 2423.3-2016 Environmental testing – Part 2.Test methods – Test Cab. Constant damp heat test (IEC 60068-2-78.2012, IDT) IEC 60326-2.1990 Printed boards - Part 2.Test methods Note. GB/T 4677-2002 Test Methods for Printed Circuit Boards (eqvIEC 60326-2.1990) IEC 60454-3-1 Pressure-sensitive adhesive tapes for electrical applications – Part 3.Individual material specifications – Part 1.Polyvinyl chloride with pressure-sensitive adhesives ...