GB/Z 16935.2-2013Insulation coordination for equipment within low-voltage systems - Part 2-1: Application guide - Explanation of the application of the IEC 60664 series, dimensioning example and dielectric testing (English PDF)
低压系统内设备的绝缘配合 第2-1部分：应用指南 GB/T 16935系列应用解释，定尺寸示例及介电试验
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 17, 2013
Implementation date
April 9, 2014
Scope
GB/Z 16935.2-2013 is the English-translated version of 低压系统内设备的绝缘配合 第2-1部分：应用指南 GB/T 16935系列应用解释，定尺寸示例及介电试验.
GB/Z 16935.2-2013 is the Chinese standard "Insulation coordination for equipment within low-voltage systems - Part 2-1: Application guide - Explanation of the application of the IEC 60664 series, dimensioning example and dielectric testing".
Its scope clause reads: This part of GB/T 16935, which is a technical report, serves as an application guide for technical committees and manufacturers specifying dimensioning requirements for products in accordance with the GB/T 16935 series. Its clauses include terms and definitions.
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Document preview — GB/Z 16935.2-2013
National Standard of the People's Republic of China
- ICS
- 29.080.30
- Classification
- K 30
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- FOREWORD3
- INTRODUCTION4
- 1 Scope6
- 2 Normative references6
- 3 Terms and definitions7
- dimensioning of LV equipment17
- 16935.1-2008)53
- technical65
- technical committees69
- manufacturer70
- voltages above 1 000 V d.c75
- References76
1 Scope
This part of GB/T 16935, which is a technical report, serves as an application guide for technical committees and manufacturers specifying dimensioning requirements for products in accordance with the GB/T 16935 series.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 16895.10-2010, Low-voltage electrical installations - Part 4-44.Protection for safety - Protection against voltage disturbances and electromagnetic disturbances (IEC 60364-4-44.2007, IDT)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
insulating material such as varnish or dry film laid on the surface of the assembly
4 Principles and practical application of the GB/T 16935 series for insulation dimensioning of LV equipment
Insulation coordination is also applicable to specially protected areas, e.g. as described in GB 3826.In such cases, however, additional requirements are applicable, in particular with respect to the specification of the overvoltage category and the environmental conditions.
5 Four examples showing appropriate dimensioning of insulation within equipment
In the following examples, overvoltage category III (Figures 5b and 5c) and overvoltage category II (Figure 5d) and pollution degree 2 are used to illustrate the dimensioning of clearances according to Tables F.2 and F.7 in GB/T 16935.1-2008.
6 Practical application of the GB/T 16935 series with regards to particular questions
If the equipment incorporates components bridging the functional insulation between live parts connected to mains, the impulse test is applied as described in 6.3.2 and 6.3.3.
7 Examples of a dimensioning worksheet (based on case A as described in GB/T 16935.1-2008)
Dimensioning of clearance and creepage following GB/T 16935.1
See Table 15 for example for dimensioning a clearance and creepage distance following
GB/T 16935.1 in circuits not directly connected to mains supply.
Annex A (Informative)
Overview of clauses of GB/T 16935.1 requiring decisions by technical
When referring to GB/T 16935.1, technical committees are required to specify the following items.
GB/T 16935.1-2023 | GB/T 16935.4-2011 | GB/T 16935.3-2025 | […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 50 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 16895.10-2010, Low-voltage electrical installations - Part 4-44: Protection for safety - Protection against voltage disturbances and electromagnetic disturbances (IEC 60364-4-44:2007, IDT).Low-voltage electrical installations - Part 4-44: Protection for safety - Protection against voltage disturbances and electromagnetic disturbances
- GB/T 16935.1-2008, Insulation coordination for equipment within low-voltage systems - Part 1: Principles, requirements and tests (IEC 60664-1:2007, IDT).Insulation coordination for equipment within low-voltage supply systems - Part 1: Principles, requirements and tests
- GB/T 16935.3-2005, Insulation coordination for equipment within low-voltage systems - Part 3: Use of coating, potting or moulding for protection against pollution (IEC 60664-3:2003, IDT).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 (IEC 60664-4:2005, IDT).Insulation coordination for equipment within low-voltage systems -- Part 4: Consideration of high-frequency voltage stress
- GB/T 16935.5-2008, Insulation coordination for equipment within low-voltage systems - Part 5: Method for determining clearances and creepage distances not exceeding 2 mm (IEC 60664-5:2007, IDT). The English wording above renders the Chinese title as printed in this document.Insulation coordination for equipment within low-voltage systems -- Part 5: Comprehensive method for determining clearances and creepage distances equal to or less than 2mm
- GB/T 17045-2008, Protection against electric shock - Common aspects for installation and equipment (IEC 61140:2001, IDT).Protection against electric shock - Common aspects for installations and equipment
IEC 60085:2007, Electrical insulation - Thermal evaluation and designation. · IEC 60112:2003, Method for the determination of the proof and the comparative tracking indices of solid insulating materials, together with Amendment 1 (2009). · IEC 60216 (all parts), Electrical insulating material - Property of thermal endurance.
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