GB/Z 16935.2-2013 English PDF (GBZ16935.2-2013)

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GB/Z 16935.2-2013: 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
GB/Z 16935.2-2013
NATIONAL STANDARDIZATION GUIDING TECHNICAL
DOCUMENT OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 29.080.30
K 30
GB/Z 16935.2-2013 / IEC/TR 60664-2-1:2011
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
(IEC/TR 60664-2-1:2011, IDT)
ISSUED ON: DECEMBER 17, 2013
IMPLEMENTED ON: APRIL 09, 2014
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of China.
Table of Contents
FOREWORD ... 3 
INTRODUCTION ... 4 
1 Scope ... 6 
2 Normative references ... 6 
3 Terms and definitions... 7 
4 Principles and practical application of the GB/T 16935 series for insulation
dimensioning of LV equipment ... 17 
5 Four examples showing appropriate dimensioning of insulation within equipment 42 
6 Practical application of the GB/T 16935 series with regards to particular questions
... 48 
7 Examples of a dimensioning worksheet (based on case A as described in GB/T
16935.1-2008) ... 53 
Annex A (Informative) Overview of clauses of GB/T 16935.1 requiring decisions by
technical ... 65 
Annex B (Informative) Overview of clauses of GB/T 16935.4 requiring decisions by
technical committees ... 69 
Annex C (Informative) Overview of clauses of GB/T 16935.5 requiring decisions by
technical committees, specification of options or requiring activities by the
manufacturer ... 70 
Annex D (Informative) Dimensioning of clearances and creepage distances for d.c.
voltages above 1 000 V d.c... 75 
References ... 76 
FOREWORD
GB/T 16935 "Insulation coordination for equipment within low-voltage systems” is
divided into 5 parts:
-- Part 1: Principles requirements and tests;
-- Part 2-1: Application guide - Explanation of the application of the GB/T 16935
series, dimensioning example and dielectric testing;
-- 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 of Part 2-1 of GB/T 16935.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009.
This Part uses the translation method to equivalently adopt IEC 60664-2-1:2011
"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".
This Part was proposed by China Electrical Equipment Industry Association.
This Part shall be under the jurisdiction of National Technical Committee of Insulation
Coordination for Low voltage Equipment Standardization (SAC/TC 417).
The drafting organizations of this Part: Shanghai Electrical Apparatus Research
Institute.
The drafters of this Part: Zhang Jianbing, Wu Qingyun, Bao Ge.
INSULATION COORDINATION FOR EQUIPMENT
WITHIN LOW-VOLTAGE SYSTEMS –
Part 2-1: Application guide – Explanation of the application
of the GB/T 16935 series, dimensioning examples and
dielectric testing
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.
The significant items for consideration are as follows:
a) nominal system voltage(s) or rated insulation voltage(s);
b) overvoltage category of the products (OV cat.);
c) any type of overvoltages;
d) frequency of the voltage;
e) characteristics of the solid insulating material;
f) pollution degree and humidity levels.
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)
GB/T 16935.1-2008, Insulation coordination for equipment within low-voltage
systems - Part 1: Principles requirements and tests (IEC 60664-1:2007, IDT)
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)
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)
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 2 mm (IEC 60664-5:2007, IDT)
GB/T 17045-2008, Protection against electric shock - Common aspects for
installation and equipment (IEC 61140:2001, IDT)
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
Amendment 1 (2009)
IEC 60216 (all parts) Electrical insulating material - Property of thermal endurance
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
NOTE: All definitions can be found in the various parts of the GB/T 16935 series, as
indicated below.
3.1
approximately homogeneous field
for frequencies exceeding 30 kHz the field is considered to be approximately
homogeneous when the radius of curvature of the conductive parts is equal or greater
than 20 % of the clearance
[GB/T 16935.4-2011, 3.1]
3.2
base material
insulating material upon which a conductive pattern may be formed
[GB/T 16935.3-2005, 3.1]