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GB/T 20637-2025: Electrical installations in ships - General construction and test methods of power, control and instrumentation cables for shipboard and offshore applications
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GB/T 20637-2025	English	994	Add to Cart	7 days [Need to translate]	Electrical installations in ships - General construction and test methods of power, control and instrumentation cables for shipboard and offshore applications
GB/T 20637-2006	English	614	Add to Cart	4 days [Need to translate]	Electrical installations in ships -- Shipboard power cables -- General construction and test requirements

GB/T 20637-2025: Electrical installations in ships - General construction and test methods of power, control and instrumentation cables for shipboard and offshore applications

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ICS 29.060.20 CCSK13 National Standards of the People's Republic of China Replaces GB/T 20637-2006 Marine electrical systems for marine and offshore facilities power supply General Structure and Test Methods for Control and Instrumentation Cables Released on October 5, 2025; to be implemented on May 1, 2026. State Administration for Market Regulation The State Administration for Standardization issued a statement.

Table of contents

Preface V 1.Scope 1 2 Normative References 1 3.Terms and Definitions 4. 4.Structural Requirements 8 4.1 General Requirements 8 4.2 Conductor 9 4.3 Insulation System 10 4.4 Shielding 11 4.5 Cable completed 11 4.6 Lining, Filling and Tape 12 4.7 Inner sheath 12 4.8 Metal Woven Armor 12 4.9 Outer sheath 13 5.Test Methods 13 5.1 Test Conditions 13 5.2 Routine Test 14 6.Sampling test 16 6.1 Overview 16 6.2 Sampling frequency of the sampling test. 16 6.3 Second-round interview 16 6.4 Conductor Inspection 16 6.5 Measurement of Insulation Thickness 17 6.6 Measurement of Non-metallic Sheath Thickness 17 6.7 Measurement of outer diameter 17 6.8 Thermal stretching test of insulation and sheath 17 6.9 Insulation Resistance Test (Volume Resistivity Measurement) 18 7 Electrical type test 18 7.1 General Provisions 18 7.2 Insulation Resistance Measurement 19 7.3 The AC capacitance increased by 19% after immersion in water. 7.4 4-hour voltage test for cables with rated voltage of 1.8/3kV and below (20 seconds) 7.5 Working capacitor (control and instrumentation cables only) 20 7.6 Inductance-to-resistance ratio (control and instrumentation cables only) 20 7.7 High Voltage Procedure Test [Cables with rated voltage higher than 3.6/6(7.2)kV] 20 8 Non-electrical type tests 23 8.1 Overview 23 8.2 Measurement of Insulation Thickness 23 8.3 Measurement of non-metallic sheath thickness (excluding inner lining) 23 8.4 Mechanical property tests of insulation before and after aging 23 8.5 Mechanical property tests of the sheath before and after aging 23 8.6 Additional aging test (compatibility test) of finished cable samples 24 8.7 Weight loss test of polyvinyl chloride (PVC) ST2 sheath 24 8.8 Performance Tests of PVCST2 Sheath and Halogen-Free SHF1 Sheath at High Temperatures (High-Temperature Pressure Test) 25 8.9 Low-Temperature Performance Tests of PVCST2 Sheaths, Halogen-Free SHF1 and SHF2 Sheaths 25 8.10 Special Low-Temperature Performance Test (if required) 25 8.11 Metallic Coating Test of Copper Wire 25 8.12 Zinc plating test 25 8.13 Crack resistance test (thermal shock test) of PVCST2 sheath and halogen-free SHF1 sheath 25 8.14 Ozone resistance test for insulation and sheath 25 8.15 Oil resistance test and reinforced oil resistance test of the sheath 26 8.16 Drilling fluid resistance test (if required) 26 8.17 Combustion Test 26 8.18 Determination of HEPR Insulation Hardness 27 8.19 Determination of HEPR's elastic modulus 27 8.20 Marking abrasion resistance 27 Appendix A (Normative) Assumptive Calculation Method for Determining Sheath Dimensions 28 A.1 Overview 28 A.2 General Requirements 28 A.3 Method 28 Appendix B (Informative) Recommended Minimum Voltage Levels for Spark Testing (See IEC 62230) 34 B.1 Overview 34 B.2 Test voltage 34 Appendix C (Normative) Numerical Rounding 36 C.1 Rounding of numbers used in assumed calculation methods 36 C.2 Rounding off numbers for other purposes 36 Appendix D (Normative) Calculation of Upper and Lower Limits for the External Dimensions of Round Copper Conductor Cables 37 D.1 Overview 37 D.2 Lower limit of outer diameter 37 D.3 Upper limit of outer diameter. 37 D.4 Thickness of mandatory or optional coverings other than insulation and sheathing 39 Appendix E (Normative) Low Temperature Bending Test and Low Temperature Impact Test 40 E.1 Any specified bending test at low temperature 40°C E.2 Impact test at any specified low temperature 41 References 42

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document supersedes GB/T 20637-2006 "General Structure and Test Requirements for Marine Electrical Cables" and is consistent with... Compared with GB/T 20637-2006, apart from structural adjustments and editorial changes, the main technical changes are as follows. ---The scope of application of the standard has been changed (see Chapter 1, Chapter 1 of the.2006 edition); ---Added terms "braided armor layer", "compatibility test", "insulated core", "bare shielded wire/drain wire", "electrostatic shielding", "fire resistant/wire" "Road integrity", "inner sheath", "multi-unit cable", "outer sheath", "pair group", "four-wire group", "single-unit cable", "SZ cabling", "three-wire" The term "group" and its definition have been removed, along with the terms "sheath" and "flexible wire" and their definitions (see Chapter 3, Chapter 3 of the.2006 edition). ---Added "General Requirements" for cable structure (see 4.1); ---The regulations concerning "conductors" have been amended (see 4.2, Chapter 4 of the.2006 edition); ---The provisions related to "insulation" have been amended (see 4.3, Chapter 5 of the.2006 edition); ---A "blocking" requirement has been added (see 4.4); ---The regulations related to "cabling" have been amended (see 4.5, Chapter 6 of the.2006 edition); ---The provisions regarding "lining, filling, and strapping" have been amended (see 4.6, Chapter 7 of the.2006 edition); --- An "inner sheath" requirement has been added (see 4.7); --- An "outer sheath" requirement has been added (see 4.9); ---The following have been removed. "components of the outer protective layer, wire armor, metal belt armor, dimensions of metal armor, impregnated fiber weaving, armor". Regulations regarding the use of padding (see Chapter 8 of the.2006 edition); ---The environmental temperature requirements for testing have been changed (see 5.1.1, 9.1 in the.2006 edition); ---The overview of routine tests has been revised (see 5.2.1, 10.1 in the.2006 version); ---The regulations concerning "voltage testing" have been amended (see 5.2.3, 10.3 of the.2006 version); ---Added "Partial Discharge Test" (see 5.2.4); ---The overview of sampling tests has been revised (see 6.1, 11.1 in the.2006 edition); ---Added a "retest" for sampling tests (see 6.3); ---The "size of the armor layer" has been removed (see 11.6 in the.2006 edition); ---The section "Performance Tests of PVC Insulation and PVC, SHF1, and SHF2 Sheaths at Low Temperatures" has been removed (see 11.9 of the.2006 edition). ---The "water tightness test" has been removed (see 11.10 in the.2006 edition); ---The "Overview" of electrical type testing has been amended (see 7.1, 12.1 of the.2006 edition); ---The temperature requirements for "Insulation Resistance Measurement at Ambient Temperature" have been changed (see 7.2.1, 12.2.1 in the.2006 edition); ---Added a "Working Capacitor" test (see 7.5); --- An "inductance-resistance ratio" test has been added (see 7.6); ---Added "High Voltage Procedure Test" (see 7.7); ---Added "Special Test for Low Temperature Performance" (see 8.10); ---The relevant tests and requirements for PVC insulation have been deleted (see 13.6, 13.7, 13.8, and 13.9 in the.2006 edition); ---The "Oil Resistance Test for Sheaths" has been amended (see 8.15,.2006 edition 13.12); ---Added "Drilling fluid resistance test" (see 8.16); ---Added a "combustion test" (see 8.17); ---Added a "marking abrasion resistance" test (see 8.20); ---Appendix A has been amended (see Appendix A, Appendix A of the.2006 edition); ---Appendix E (Normative) "Low-Temperature Bending Test and Low-Temperature Impact Test" has been added; ---The appendices “Procedures for Checking the Validity of Spark Testing Methods,” “Testing Copper Wire Metal Coatings,” and “Zinc Plating of Steel Wires” have been deleted. "Experiments" (see Appendix D, Appendix E, and Appendix F of the.2006 edition). This document is equivalent to IEC 60092-350.2020 "Marine electrical installations – Part 350.Electrical power and control systems for shipboard and offshore installations". General structure and testing requirements for instrument cables. Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed by the China Electrical Equipment Industry Association. This document is under the jurisdiction of the National Technical Committee on Standardization of Wires and Cables (SAC/TC213). This document was drafted by. Shanghai Cable Research Institute Co., Ltd., Shanghai Guolan Testing Co., Ltd., and Jiangsu Shangshang Cable Group Co., Ltd. The company, Baosheng Technology Innovation Co., Ltd., Yangzhou Guangming Cable Co., Ltd., Changzhou Marine Cable Co., Ltd., and Shanghai Pudong Wire & Cable Co., Ltd. Cable (Group) Co., Ltd., Zhongtian Technology Equipment Cable Co., Ltd., Zhejiang Yuantong Cable Manufacturing Co., Ltd., Nanjing Quanxin Transmission Technology Co., Ltd. Limited Liability Company, Hebei Huatong Cable Group Co., Ltd., Far East Cable Co., Ltd., Shanghai Qifan Cable Co., Ltd., Xinyate Cable Co., Ltd., and Maitno (Ma'anshan) Special Cable Co., Ltd. The main drafters of this section are. Han Yongjin, Peng Chunyao, Sha Wei, Liu Yanjun, Hu Xuechao, Liu Tongtong, Chen Wei, Zhou Jialong, Chen Wanfang, and Li Yongjiang. Dou Limei, Chen Jing, Gao Wenqi, Han Huifu, Chen Wengang, Liu Jingping. The release history of this document and the document it replaces is as follows. ---First published in.2006 as GB/T 20637-2006; ---This is the first revision. Marine electrical systems for marine and offshore facilities power supply General Structure and Test Methods for Control and Instrumentation Cables

1 Scope

This document specifies the copper ratings for stationary electrical systems with a rated voltage of 18/30(36) kV and below for marine and offshore (mobile and fixed) installations. The general structural requirements for core power, control, and instrumentation cables are described, along with the corresponding test methods. The fixed systems described in this document include those subjected to vibration (due to vibration of the ship or equipment) or motion (due to motion of the ship or equipment). This excludes systems that experience frequent bending. Cables suitable for frequent or continuous bending are detailed in other IEC standards. As specified in IEC 60227 (all parts) and IEC 60245 (all parts), its use is limited to situations where there is no direct exposure to the marine environment. In addition, such as portable tools or household appliances. This document does not include the following types of cables. ---Fiber optic cable; ---Submarine cables and umbilical cables; ---Data cables and communication cables; ---Coaxial cable.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included. For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. This document. GB/T 33596-2017 Insulation and sheathing of electrical cables for marine and offshore installations - power, control, instrumentation and communication cables Materials (IEC 60092-360.2014, IDT) ISO 7989-2.2021 Steel wire and steel wire products - Non-ferrous metal coatings on steel wire - Part 2.Zinc and zinc alloy coatings (Steel wire) ing) Note. GB/T 2972-2016 Test method for copper sulfate in zinc coating of galvanized steel wire (ISO 7989-2.2007, NEQ). The referenced content of ISO 7989-2.2021 is related to... There are no technical differences in the content referenced in ISO 7989-2.2007. lary(IEV)-Part 461.Electriccables] Note. GB/T 2900.10-2013 Electrical Terminology - Cables (IEC 60050-461.2008, IDT). Note. GB/T 3956-2008 Conductors of cables (IEC 60228.2004, IDT). Note. GB/T 3048.13-2007 Electrical Performance Test Methods for Wires and Cables - Part 13.Impulse Voltage Test (IEC 60230.1966, IEC 60060-1. 1989, MOD). IEC 60331-1 Line integrity test of cables under flame conditions - Part 1.Flame supply at a temperature not lower than 830°C ...