GB 50217-2018 (GB 50217-2007) PDF English
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Standard for design of cables of electric power engineering
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| GB 50217-2007 | English | 125 |
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Code for design of cables of electric engineering
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GB 50217-2007: Code for design of cables of electric engineering---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB50217-2007
NATIONAL STANDARD •
OF THE PEOPLE'S REPUBLIC OF CHINA
Code for Design of Cables of Electric Engineering
LSSUED ON. OCTOBER 23, 2007
Implemented on: APRIL 1, 2008
Jointly Issued by Minimy of Construdioo of the People's Republic of China
Geaend Admiaistratioo uf Quaiity Supenisioo, Inspection aod
Quaraa8ae of the ~prs Repubic of China
Foreword
According to the requirements of Document Jian Biao [2002] No. 85 issued by Ministry
of Construction-Notice on Printing the Development and Revision Plan of National
Engineering Construction Standards in 2001 to 2002, the code is jointly revised from "Code
for Design of Cables of Electric Engineering" GB 50217-1994 by Southwest China Electric
Power Design Institute of China Power Engineering Consulting Group and all concerned
organisations.
The code revises main technical contents as follows.
1. Add requirement for selecting number of cores m mid-voltage cables and
high-voltage cables ;
2. Add requirement for selecting cable insulation style; Cancel relevant contents on
viscosity impregnated paper insulated cable;
3. Add requirement for selecting permissible minimal section of protection ground wire
of body core section 400mm2< S .S800mm2 and S > 800mm2;
4. Add requirement for cross section and material of cable while power supply circuit of
high current load was parallel connected with many cables;
5. Add universal requirement for selecting cable terminal;
6. Add content of directly carrying out open circuit to cable metal level and carry out
insulation treatment;
7. Add metal level grounding requirements for three-core cable in alternating-cunent
system;
8. Add provision about permissible space between cables and conduits in city cable
system;
9. Add requirement for setting inspection gallery of overhead trays ;
10. Add requirement for spacing set among safety vents of cable tunnel;
11. Add Appendix B and Appendix F.
The provision (s) printed in bold type is (are) compulsory one (ones) and must be
enforced strictly .
Ministry of Construction 1s 111 charge of the administration of this code and the
explanation of the compulsory provisions. China Electricity Council Standardization Center is
responsible for specific administration; Southwest Electric Power Design Institute of China
Power Engineering Consulting Group is responsible for the explanation of specific technical
contents. All relevant organizations are kindly requested to sum up and accumulate your
experiences in actual practices during the process of implementing this code. The relevant
opinions and advice, whenever necessary, can be feedback to Southwest China Electric Power
Table of Contents
General Provisions ... 1
2 Terms ... 2
3 Selection ofTypes and Cross Sections of Cables ... 4
3.1 Material of Cable Conductor ... 4
3.2 Number of Cores for Power Cables ... 4
3.3 Insulation Level of Cables ... 5
3.4 Insulation Type of Cables ... 6
3.5 Types of Protective Coverings for Cables ... 8
3.6 Control Cables and Metallic Screen ... 10
3. 7 Cross Sections of Power Cables ... 12
4 Selection and Configuration of Cable Accessories ... 17
4.1 General Provisions ... 17
4.2 Oil-supply System of Self-contained Oil-filled Cables ... 22
5 Cable Laying ... 25
5.1 General Rules ... 25
5.2 Selection of the Way of Cable Laying ... 28
5.3 Direct Burying Underground ... 30
5.4 Laying in Protection Conduits ... 32
5.5 Laying in Cable Buildings ... 34
5.6 Laying in Other Public Facilities ... 37
5.7 Laying Underwater ... 38
6 Supporting and Fixing of Cables ... 39
6.1 General Rules ... 39
6.2 Cables Brackets and Trays ... 41
7 Cable Fire Prevention and Retardation ... 44
Appendix A Maximum Permissible Temperature of Common Power Cables Conductor ... 48
Appendix C Permissible 100% cContinuous Current Capacity of Common Power Cables of
lOkV and Below 10kV ... 52
Appendix E Methods to Calculate Permissible Minimum Conductor-section-area According
to Short-circuit Thermostable Conditions ... 62
Appendix F Formulae for Normal Induction Potential of Single-core Cable Metallic Layer
in AC System ... 65
Appendix G Additional Length When Installing and Measuring Cables of35kV and Below
... 67
Explanation ofWording in This Code ... 70
1 General Provisions
1.0.1 This code is formulated with a view to make cable design of electric engineering to
live up to state-of-art technology, economy and rationality, safety and usability and also
convenient for construction and maintenance.
1.0.2 This code is applicable to selection and burying design of power supply cable and
control cable which is SOOkV or below in construction and extension of electric engineering.
1.0.3 Towards cable design of electric engineering, not only the requirements stipulated in
this code, but also those in the current relevant ones of the nation shall be complied with.
2 Terms
2.0.1 Fire resistance
It is a characteristic property that sample cable can remain on-stream performance under
specific test conditions for a specific time although burnt in fire.
2.0.2 Fire resistant cable
It is a kind of cable with fire resistance.
2.0.3 Flame retardancy
It is a characteristic property of cables that cable is ignited under specified test conditions
and its flame only spread in delimited region and its after-flame or after-bright can go out by
itself in limited time since the flame source is removed.
2.0.4 Flame retardant cable
It is a kind of cable with fire-retardancy.
2.0.5 Dry-type cross-linked
It is a cross linked process used to reduce remarkably the moisture of cross-linked
polyethylene insulation materials during manufacturing.
2.0.6 Water tree
It is a brief term to describe a phenomena when insulating layer has arborization hair-
crack while cross-linked polyethylene cable is in service.
2.0.7 Metallic-plastic composite water barrier
It is a water barrier that is made up of a composite tape with a thin metallic layer of
aluminum or aluminum foil contained in the plastics to wind along the cables.
2.0.8 Thermal resistance
It is a physical quantity defined by thermal ohm principle for the one-dimension
exothermic process using the analytic method for thermal network to calculate current
carrying capacity of cable .
2.0.9 Auxiliaty ground wire
It refers to voltaic wire laid in parallel with high-voltage single-core cable line and
connects with ground at both ends to establish a circuit for induced current.
2.0.10 Direct burying
It refers to a cable laying method that lay cables in underground ditch whose bottom
covered with underlayer, as well as cover cable with mantle and add fender apron to level the
ground.
3 Selection of Types and Cross Sections of Cables
3.1 Material of Cable Conductor
3.1.1 Copper conductor shall be used for control cables.
3.1.2 It is suggested to use copper conductor for power cables when used in the following
cases .
1 To be used in the circuits of motor excitation, important power supplies, mobile
electrical equipment, etc., which are required to maintain a connection and have a high
reliability.
2 To be used in a severe operating environment where there are intense vibration,
explosion hazard, corrosion of aluminum, etc ..
3 To be used as fire-resistant cables.
4 To be used while abut against high-temperature machinery.
5 To be used in public facilities which has high security requirement.
6 To be used while working current is relatively large and number of cable are required
to increase.
3.1.3 Either aluminum conductor or copper conductor can be used as the conductor material
of cables except for those products that only have copper conductors and those should use
copper conductor as defined in Articles 3 .1 .1 and 3 .1.2 hereof.
3.2 Number of Cores for Power Cables
3.2.1 When the neutral points of power supply of 1kV and below 1kV are directly grounded,
the selection of number of cores of cables used for the 3-phase circuits shall comply with the
following provisions.
1 In the cases the exposed conductible parts of protection lines and energized
equipment are connected to ground, following provisions shall be complied...
1) When the protection line and the neutral line use a common conductor, four-core
cables shall be used.
2) When the protection line and the neutral line are separated, five-core cables should
be used, and when the requirements specified in Article 5 .1.16 of this Code are
satisfied, it is also permissible to use four-core cables and an additional conductor
ofthe protection line.
2 When the grounding of exposed conductible parts of energized equipment ts
separated from the grounding of the...
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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