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GB/T 12706.1-2020 (GBT 12706.1-2020)

Chinese standards (related to): 'GB/T 12706.1-2020'
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GB/T 12706.1-2020English910 Add to Cart 0--3 minutes. Auto immediate delivery. Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um=1.2 kV) up to 35 kV (Um=40.5 kV) -- Part 1: Cables for rated voltage of 1 kV (Um=1.2 kV) and 3 kV (Um=3.6 kV) GB/T 12706.1-2020 Valid GBT 12706.1-2020
GB/T 12706.1-2008English1319 Add to Cart 7 days Power cables with extruded insulation and their accessories for rate voltages from 1 kV (Um=1.2 kV) up to 35 kV (Um=40.5 kV) -- Part 1: Cables for rated voltage of 1 kV (Um=1.2 kV) and 2 kV (Um=3.6 kV) GB/T 12706.1-2008 Obsolete GBT 12706.1-2008
GB/T 12706.1-2002English1359 Add to Cart 9 days Rated voltage of 1 kV (Um = 1. 2 kV) to 35 kV (Um = 40. 5 kV) extruded insulation power cables and accessories -- Part 1: The rated voltage of 1 kV (Um = 1. 2 kV) and 3 kV (Um = 3. 6 kV) cable GB/T 12706.1-2002 Obsolete GBT 12706.1-2002
GB 12706.1-1991English639 Add to Cart 5 days Copper or aluminium conductor extruded plastic insulated power cables with rated voltages up to 35kV--Part 1: General GB 12706.1-1991 Obsolete GB 12706.1-1991


   
BASIC DATA
Standard ID GB/T 12706.1-2020 (GB/T12706.1-2020)
Description (Translated English) Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um=1.2 kV) up to 35 kV (Um=40.5 kV)--Part 1: Cables for rated voltage of 1 kV(Um=1.2 kV)and 3 kV(Um=3.6 kV)
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard K13
Classification of International Standard 29.060.20
Word Count Estimation 53,583
Date of Issue 2020-03-31
Date of Implementation 2020-10-01
Older Standard (superseded by this standard) GB/T 12706.1-2008
Drafting Organization Shanghai Cable Research Institute Co., Ltd., Shanghai National Cable Testing Center Co., Ltd., Jiangsu Hengtong Power Cable Co., Ltd., Jiangsu Shangshang Cable Group Co., Ltd., Baosheng Technology Innovation Co., Ltd., Far East Cable Co., Ltd., Zhongtian Technology Submarine Cable Co., Ltd. , Zhejiang Wanma Co., Ltd., Hangzhou Cable Co., Ltd., Wuxi Jiangnan Cable Co., Ltd., Qingdao Han Cable Co., Ltd., China Electric Power Research Institute, Guangzhou Nanyang Cable Co., Ltd., Fujian Nanping Sun Cable Co., Ltd., Shanghai Maple Cable Co., Ltd., Ningbo Ball Crown Cable Co., Ltd., Kunming Cable Group Co., Ltd., Hangzhou Huaxin Power Cable Co., Ltd., Tongding Internet Information Co., Ltd., Jinbei Electric Co., Ltd., Lanzhou Zhongbang Wire and Cable Group Co., Ltd., Shanghai
Administrative Organization National Wire and Cable Standardization Technical Committee (SAC/TC 213)
Regulation (derived from) National Standards Announcement No. 4 of 2020
Proposing organization China Electrical Equipment Industry Association
Issuing agency(ies) State Administration for Market Regulation, Standardization Administration of China


GB/T 12706.1-2020: PDF in English (GBT 12706.1-2020)
GB/T 12706.1-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.060.20
K 13
Replacing GB/T 12706.1-2008
Power Cables with Extruded Insulation and Their Accessories
for Rated Voltages from 1 kV (Um = 1.2 kV) up to 35 kV (Um =
40.5 kV) - Part 1: Cables for Rated Voltage of 1 kV (Um = 1.2 kV)
and 3 kV (Um = 3.6 kV)
[IEC 60502-1:2004, Power Cables with Extruded Insulation and Their Accessories for
Rated Voltages from 1 kV (Um = 1.2 kV) up to 30 kV (Um = 36 kV) - Part 1: Cables for
Rated Voltage of 1 kV (Um = 1.2 kV) and 3 kV (Um = 3.6 kV), MOD]
ISSUED ON: MARCH 31, 2020
IMPLEMENTED ON: OCTOBER 1, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 4 
1 Scope ... 11 
2 Normative References ... 11 
3 Terms and Definitions ... 14 
4 Voltage Marking and Materials ... 15 
5 Conductors... 18 
6 Insulation ... 18 
7 Cores, Inner Coverings and Fillers of Multi-core Cables ... 21 
8 Metallic Layers for Single-core or Multi-core Cables ... 24 
9 Metallic Screen ... 24 
10 Concentric Conductor ... 25 
11 Lead Sheath ... 26 
12 Metallic Armor ... 26 
13 Over-sheath ... 30 
14 Test Conditions ... 32 
15 Routine Tests ... 32 
16 Sample Tests ... 34 
17 Electrical Type Tests ... 41 
18 Non-electrical Type Tests ... 44 
19 Electrical Tests after Installation ... 53 
20 Supplementary Clauses for Cable Products ... 53 
Appendix A (normative) Fictitious Calculation Method for Determination of
Dimensions of Protective Coverings ... 61 
Appendix B (normative) Rounding-off of Numerical Values ... 69 
Appendix C (normative) Measurement and Calculation of Overlap Rate and
Clearance Rate ... 72 
Appendix D (normative) Determination of Hardness of HEPR Insulations ... 73 
Appendix E (normative) Supplementary Clauses for Cable Products ... 76 
Bibliography ... 82 
Power Cables with Extruded Insulation and Their
Accessories for Rated Voltages from 1 kV (Um = 1.2
kV) up to 35 kV (Um = 40.5 kV) - Part 1: Cables for
Rated Voltage of 1 kV (Um = 1.2 kV) and 3 kV (Um = 3.6
kV)
1 Scope
This Part of GB/T 12706 specifies the structure, dimensions and test requirements for
power cables with extruded insulation for rated voltage of 1 kV (Um = 1.2 kV) and 3 kV
(Um = 3.6 kV).
This Part is applicable to power cables with extruded insulation for rated voltage of 1
kV (Um = 1.2 kV) and 3 kV (Um = 3.6 kV) for fixed installations in distribution networks
or industrial units.
This Part is inapplicable to cables with special installation and service conditions, such
as: cables for overhead networks, the mining industry, nuclear power plants (inside
and around the containment area), submarine purposes or shipboard application.
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specified date, only versions with a specified date are
applicable to this document. In terms of references without a specified date, the latest
version (including all the modifications) is applicable to this document.
GB/T 156 Standard Voltages (GB/T 156-2017, IEC 60038:2009, MOD)
GB/T 2951.11-2008 Common Test Methods for Insulating and Sheathing Materials of
Electric and Optical Cables - Part 11: Methods for General Application - Measurement
of Thickness and Overall Dimensions - Tests for Determining the Mechanical
Properties (IEC 60811-1-1:2001, IDT)
GB/T 2951.12-2008 Common Test Methods for Insulating and Sheathing Materials of
Electric and Optical Cables - Part 12: Methods for General Application - Thermal
Ageing Methods (IEC 60811-1-2:1985, IDT)
GB/T 2951.13-2008 Common Test Methods for Insulating and Sheathing Materials of
Electric and Optical Cables - Part 13: Methods for General Application - Measurement
of Limiting Values
GB/T 11017.2-2014 Power Cables with Cross-lined Polyethylene Insulation and Their
Accessories for Rated Voltage of 110 kV (Um = 126 kV) - Part 2: Power Cables
GB/T 11091 Copper Strips for Cables
GB/T 12706.2 Power Cables with Extruded Insulation and Their Accessories for Rated
Voltages from 1 kV (Um = 1.2 kV) up to 35 kV (Um = 40.5 kV) - Part 2: Cables for Rated
Voltages from 6 kV (Um = 7.2 kV) up to 30 kV (Um = 36 kV) (GB/T 12706.2-2020, IEC
60502-2:2014, MOD)
GB/T 16927.1 High-voltage Test Techniques - Part 1: General Definitions and Test
Requirements (GB/T 16927.1-2011, IEC 60060-1:2010, MOD)
GB/T 17650.1 Test on Gases Evolved during Combustion of Materials from Cables -
Part 1: Determination of the Amount of Halogen Acid Gas (GB/T 17650.1-1998, IEC
60754-1:1994, IDT)
GB/T 17650.2 Test on Gases Evolved during Combustion of Materials from Cables -
Part 2: Determination of Degree of Acidity of Gases by Measuring pH and Conductivity
(GB/T 17650.2-1998, IEC 60754-2:1991, IDT)
GB/T 18380.11 Tests on Electric and Optical Fiber Cables under Fire Conditions - Part
11: Test for Vertical Flame Propagation for a Single Insulated Wire or Cable - Apparatus
(GB/T 18380.11-2008, IEC 60332-1-1:2004, IDT)
GB/T 18380.12 Test on Electric and Optical Fiber Cables under Fire Conditions - Part
12: Test for Vertical Flame Propagation for a Single Insulated Wire or Cable -
Procedure for 1 kW Pre-mixed Flame (GB/T 18380.12-2008, IEC 60332-1-2:2004, IDT)
GB/T 18380.13 Tests on Electric and Optical Fiber Cables under Fire Conditions - Part
13: Test for Vertical Flame Propagation for a Single Insulated Wire or Cable -
Procedure for Determination of Flaming Droplets / Particles (GB/T 18380.13-2008, IEC
60332-1-3:2004, IDT)
GB/T 18380.33 Tests on Electric and Optical Fiber Cables under Fire Conditions - Part
33: Test for Vertical Flame Spread of Vertically-mounted Bunched Wires or Cables -
Category A (GB/T 18380.33-2008, IEC 60332-3-22:2000, IDT)
GB/T 18380.34 Tests on Electric and Optical Fiber Cables under Fire Conditions - Part
34: Test for Vertical Flame Spread of Vertically-mounted Bunched Wires or Cables -
Category B (GB/T 18380.34-2008, IEC 60332-3-23:2000, IDT)
GB/T 18380.35 Tests on Electric and Optical Fiber Cables under Fire Conditions - Part
35: Test for Vertical Flame Spread of Vertically-mounted Bunched Wires or Cables -
Category C (GB/T 18380.35-2008, IEC 60332-3-24:2000, IDT)
Routine tests are tests carried out by the manufacturer on all the manufacturing lengths
of finished cables to check whether all the cables meet the specified requirements.
3.2.2 Sample tests
Sample tests are tests carried out by the manufacturer on finished cable specimens or
some parts taken from finished cables at a specified frequency to check whether the
cables meet the specified requirements.
3.2.3 Type tests
Type tests are tests carried out before the supply of a type of cables included in this
Part in accordance with general commercial principles, to prove that the cables have
satisfactory performance to satisfy the expected conditions of use.
NOTE: the characteristic of the tests is that unless changes of cable materials or design
or manufacturing process might alter the characteristics of the cables, it is
unnecessary to re-conduct the tests.
3.2.4 Electrical tests after installation
Electrical tests after installation are tests carried out after installation to prove that the
installed cables and their accessories are in good condition.
4 Voltage Marking and Materials
4.1 Rated Voltage
In this Part, the rated voltage of the cables U0/U(Um) is 0.6/1(1.2) kV and 1.8/3(3.6)kV.
NOTE: the above-mentioned voltage representation method is suitable, even though other
representation methods are used in some countries, for example, 1.7/3 kV or
1.9/3.3 kV, instead of 1.8/3 kV.
In the voltage representation of the cables U0/U(Um):
---U0: the rated power frequency voltage between conductor and earth or metallic
screen for the design of the cables;
---U: the rated power frequency voltage between conductors for the design of the
cables;
---Um: the maximum value of the “highest system voltage” that the equipment can
withstand (see GB/T 156).
The rated voltage of the cables shall be suitable for the operating conditions of the
system, where the cables are located. In order to facilitate the selection of cables, the
For cables with rated voltage of 0.6/1 kV, the insulated core or cable core can be
covered with a collective metallic layer.
NOTE: whether a cable uses metallic layer depends on relevant specifications and
installation requirements, so as to avoid the danger of mechanical damage or
direct electrical contact.
7.3.2 Cables with a collective metallic layer (see Chapter 8)
There shall be an inner covering outside the cable core. The inner coverings and fillers
shall comply with the stipulations of 7.2 and shall be non-hydroscopic materials.
If the thickness of a single layer of the used metallic tape does not exceed 0.3 mm,
then, the metallic tape may also be directly lapped outside the cable core, omitting the
inner covering. This type ......