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

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).

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