GB/Z 37754-2019Guidance on clearances and creepage distances in particular for distances equal to or less than 2 mm - Test results of research on influencing parameters (English PDF)
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Issued by
State Administration for Market Regulation, China National Standardization Administration
Level / Type
National · Recommended
Issue date
June 4, 2019
Implementation date
January 1, 2020
Scope
GB/Z 37754-2019 (Guidance on clearances and creepage distances in particular for distances equal to or less than 2 mm - Test results of research on influencing parameters) is available as an English-translated PDF.
GB/Z 37754-2019 is the Chinese standard "Guidance on clearances and creepage distances in particular for distances equal to or less than 2 mm - Test results of research on influencing parameters".
Its scope clause reads: This guidance document describes dimensions for clearances and creepage distances not exceeding 2 mm in printed wiring boards and similar structural members.
The results of the method were determined in which the clearance and creepage distance were the same along the path of the solid insulating surface. The information given in this guidance document is for research purposes only and does not apply to clearances and creepage distances of equipment in low voltage systems.
Determination of dimensions (see GB/T 16935.1 for corresponding requirements). However, the relevant clearance and creepage distance dimensions can be used during functional design.
For reference.
This guidance document gives the results of the study in the following cases. --- Clearance independent of the microscopic environment; --- The creepage distance of pollution levels 1, 2 and 3 is also applicable to small pitch products with similar printed circuit board design; --- Avoid the creepage distance of the flashing surface of the insulation surface; --- Information on the minimum creepage distance required to maintain the minimum insulation resistance.
This guidance document specifies a test method for assessing the surface water absorption group of insulation materials that have not yet been classified. Its clauses include terms and definitions.
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Document preview — GB/Z 37754-2019
National Standard of the People's Republic of China
- ICS
- 29.080.30
- Classification
- K 30
Issued by: State Administration for Market Regulation, China National Standardization Administration
Contents
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Basic elements and phenomena of clearance and creepage distance
- 5 clearance and creepage distance
- 7 Water absorption test
- 8 Flowchart for determining size
- 9 Withstand voltage test for creepage distance under humid conditions
1 Scope
This guidance document describes dimensions for clearances and creepage distances not exceeding 2 mm in printed wiring boards and similar structural members.
The results of the method were determined in which the clearance and creepage distance were the same along the path of the solid insulating surface.
The information given in this guidance document is for research purposes only and does not apply to clearances and creepage distances of equipment in low voltage systems.
Determination of dimensions (see GB/T 16935.1 for corresponding requirements). However, the relevant clearance and creepage distance dimensions can be used during functional design.
For reference.
This guidance document gives the results of the study in the following cases.
--- Clearance independent of the microscopic environment;
--- The creepage distance of pollution levels 1, 2 and 3 is also applicable to small pitch products with similar printed circuit board design;
--- Avoid the creepage distance of the flashing surface of the insulation surface;
--- Information on the minimum creepage distance required to maintain the minimum insulation resistance.
This guidance document specifies a test method for assessing the surface water absorption group of insulation materials that have not yet been classified.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 16935.1-2008 Insulation of equipment in low-voltage systems - Part 1. Principles, requirements and tests (IEC 60664-1.
2007, IDT)
3 Terms and definitions
The following terms and definitions as defined in GB/T 16935.1-2008 apply to this document.
The terminology database addresses maintained by ISO and IEC for standardization are as follows.
3.1 Non-uniform electric field inhomogeneousfield
Non-uniform electric field
The voltage gradient between the electrodes is substantially non-constant electric field.
Note. Regarding the voltage withstand capability, the non-uniform electric field condition of the tip to the planar electrode structure is the worst case, which is called Case A. It can be made up of one
A dot electrode having a radius of 30 µm and a planar electrode of 1 m × 1 m are represented.
3.2 Uniform electric field
Uniform electric field
GB/T 36277 | GB/T 34130.1 | GB/T 34130.21 | GB/T 11918.2 | GB/T 11918.1 | […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 44 pages — is available in the English PDF.
Referenced standards
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