GB/T 16935.5-2008 PDF English
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Insulation coordination for equipment within low-voltage systems -- Part 5: Comprehensive method for determining clearances and creepage distances equal to or less than 2mm
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GB/T 16935.5-2008: Insulation coordination for equipment within low-voltage systems -- Part 5: Comprehensive method for determining clearances and creepage distances equal to or less than 2mm
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.120
K 30
GB/T 16935.5-2008 / IEC 60664-5.2007
Insulation coordination for equipment within low-
voltage systems - Part 5.Comprehensive method
for determining clearances and creepage
distances equal to or less than 2 mm
(IEC 60664-5.2007, IDT)
Issued on. JULY 16, 2008
Implemented on. APRIL 01, 2009
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword... 4
Introduction... 5
1 Scope and object... 7
2 Normative references... 8
3 Terms and definitions... 9
4 Fundamentals of clearance and creepage distance dimensioning... 9
4.1 Introductory remark... 9
4.2 Basic principles... 9
4.3 Voltages and voltage ratings... 10
4.4 Frequency... 13
4.5 Time under voltage stress... 13
4.6 Pollution... 13
4.7 Information supplied with the equipment... 14
4.8 Insulating material... 14
5 Requirements and dimensioning procedures... 16
5.1 General... 16
5.2 Dimensioning of clearances... 16
5.3 Dimensioning of creepage distances... 22
5.4 Requirements for design of solid insulation... 30
6 Tests and measurements... 33
6.1 Tests... 33
6.2 Measurement of creepage distances and clearances... 42
Annex A (informative) Dimensioning to maintain minimum insulation resistance
... 43
Annex B (normative) |Water adsorption test... 46
Annex C (informative) Dimensioning diagrams... 50
Annex D (informative) Withstand voltage test for creepage distance under
humid conditions... 53
Bibliography... 54
Foreword
GB/T 16935 “Insulation coordination for equipment within low-voltage systems”
consists of 5 parts.
- Part 1.Principles, requirements and tests;
- Part 2.Application guide;
- Part 3.Use of coating, potting or moulding for protection against pollution;
- Part 4.Consideration of high-frequency voltage stress;
- Part 5.Comprehensive method for determining clearances and creepage
distances equal to or less than 2 mm.
This Part is Part 5 of GB/T 16935.
This Part is identical to IEC 60664-5.2007 “Insulation coordination for equipment within
low-voltage systems - Part 5.Comprehensive method for determining clearances and
creepage distances equal to or less than 2 mm” (English version).
For ease of use, this Part has made the following editorial modifications.
a) DELETE the foreword of the international standard;
b) SUPPLEMENT GB/T 17045-2006, GB/T 17627.1-1998, GB/T 17627.2-1998,
IEC 60068, IEC 60364-5-51.2005 and IEC 60664-4.1997 (because they are
referenced in the article) in Clause 2 “Normative references”.
In this Part, Annex B is normative, Annex A, Annex C and Annex D are informative.
This Part is proposed by China Electrical Equipment Industry Association.
This Part is under the jurisdiction of National Technical Committee on Low Voltage
Equipment Insulation Coordination of Standardization Administration of China
(SAC/TC 417).
Responsible drafting organization of this Part. Shanghai Electric Apparatus Research
Institute (Group) Co., Ltd.
Participating drafting organization of this Part. Schneider Electric (China) Investment
Co., Ltd.
Main drafters of this Part. Huang Jingye, Liu Jinyan, Wu Qingyun.
Participating drafter of this Part. Liu Zhenzhong.
1 Scope and object
This Part of GB/T 16935 specifies the dimensioning of clearances and creepage
distances for spacings equal to or less than 2 mm for printed wiring board and
equivalent constructions, where the clearance and the creepage distance are identical
and are along the surface of solid insulation, such as the paths described in 6.2 of Part
12) (Examples 1, 5 and 11).
2 Normative references
The following referenced 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.
Clause 2 of Part 1 is applicable, as well as the following.
GB/T 4798.3-2007 Environmental conditions existing in the application of electric
and electronic products - Section 3.Stationary use at weather-protected locations
(IEC 60721-3-3.2002, MOD)
3 Terms and definitions
For the purposes of this document, the following terms and definitions, in addition to
those given in GB/T 16935.1-2008, apply.
Value of the relative humidity when the impulse withstand voltage of a creepage
distance has dropped to 95 % of the value that was measured at 70 % relative humidity.
4 Fundamentals of clearance and creepage distance dimensioning
The micro-environmental conditions for the insulation shall be taken into account. They
depend primarily on the macro-environmental conditions in which the equipment is
located and, in many cases, the environments are identical.
5 Requirements and dimensioning procedures
Values for clearances in Table 2 for case B are only applicable for homogeneous fields.
They can only be used where the shape and arrangement of the conductive parts is
designed to achieve an electric field having an essentially constant voltage gradient.
Subclause 5.3.3.7 of Part 1 is applicable.
6 Tests and measurements
If the withstand against steady-state voltages, recurring peak voltages or temporary
overvoltages according to 5.2 is decisive for the dimensioning of clearances, and if
those clearances are smaller than the case A values of Table 3, an a.c. voltage test
according to the test in 6.1.2.2.2.2 of Part 1 is required.
For the test conditions, technical committees shall specify temperature and humidity
values.
Annex A
(informative)
Dimensioning to maintain minimum insulation resistance
This annex gives information on the dimensioning of creepage distances in order to
maintain adequate insulation resistance for r.m.s. voltages up to 10 000 V, which relate
to creepage distances up to 250 mm.
Annex B
(normative)
|Water adsorption test
For the dimensioning of creepage distances with respect to flashover, the water
adsorption characteristics of the insulating material are relevant. According to the
impulse withstand capability of the surfaces of the various insulating materials under
humidity, the water adsorption groups WAG1, WAG2, WAG3 and WAG4 have been
established.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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