GB/T 12706.1-2020 English PDF (GBT12706.1-2020)

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GB/T 12706.1-2020: 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
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