GB/T 18380.34-2022Tests on electric and optical fibre cables under fire conditions - Part 34: Test for vertical flame spread of vertically-mounted bunched wires or cables - Category B (English PDF)

foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents"

drafted.

This document is part 34 of GB/T 18380 "Burning test of cables and optical cables under flame conditions". GB/T 18380 has been issued

The following parts are distributed.

--- Part 11.Test device for vertical flame spread test of a single insulated wire and cable;

--- Part 12.Test method for vertical flame spread of single insulated wire and cable 1kW premixed flame;

--- Part 13.Test method for the vertical spread of flame of a single insulated wire and cable to determine burning drips (objects)/particles;

--- Part 21.Test device for vertical flame spread of single insulated thin wire and cable;

--- Part 22.Test method for vertical spread of flame of single insulated thin wire and cable - Diffusion type flame test method;

--- Part 31.Test device for vertical flame spread of bundled wires and cables installed vertically;

--- Part 32.Vertically installed bundled wire and cable flame vertical spread test AF/R;

--- Part 33.Vertically installed bundled wire and cable flame vertical spread test Class A;

--- Part 34.Vertically installed bundled wire and cable flame vertical spread test Class B;

--- Part 35.Vertically installed bundled wire and cable flame vertical spread test Class C;

--- Part 36.Vertical flame spread test of bundled wires and cables installed vertically Class D.

This document replaces GB/T 18380.34-2008 "Burning test of electrical and optical cables under flame conditions - Part 34.Vertical installation

"Class B flame vertical spread test for bundled wires and cables", compared with GB/T 18380.34-2008, except for structural adjustments and editorial changes

In addition, the main technical changes are as follows.

--- Changed the scope of application (see Chapter 1, Chapter 1 of the.2008 edition);

--- In order to improve repeatability and reproducibility, the details of the installation of cable samples on steel ladders have been added (see 5.3, 5.3 of the.2008 edition);

--- Deleted Appendix C.

This document is equivalent to IEC 60332-3-23.2018 "Cables and Optical Cables Fire Tests under Flame Conditions Part 3-23.Vertical

Installed bundled wire and cable flame vertical spread test Category B".

The following minimal editorial changes have been made to this document.

--- In order to harmonize with existing standards, the name of the standard is changed to "Fire Tests for Cables and Optical Cables under Flame Conditions - Part 34.Vertical

Installed bundled wire and cable flame vertical spread test Category B".

Please note that some content of this document may be patented. The issuing agency of this document assumes no responsibility for identifying patents.

Introduction

Flame retardant wire and cable or optical cable products are widely used in various construction projects.

It is of great significance to reduce the occurrence of disasters and the spread of flames, reduce fire losses, and ensure the safe evacuation of all kinds of people. GB/T 18380 aims to establish

The test method for the flame retardant performance of different flame retardant wire and cable or optical cable products under different installation and laying conditions is planned to be composed of 11 parts.

--- Part 11.Test device for vertical spread of flame for a single insulated wire and cable. The purpose is to specify for single insulated electrical

Test device for vertical flame spread test of wire and cable.

--- Part 12.Single insulated wire and cable flame vertical spread test 1kW premixed flame test method. the purpose is

Test method for determining the vertical flame spread of a single insulated wire or cable or fiber optic cable under 1 kW premixed flame conditions.

--- Part 13.Test method for vertical flame spread of a single insulated wire and cable to determine burning drips (objects)/particles.

The purpose is to determine the test for the determination of burning drips (objects)/particulates in the vertical flame spread test of a single insulated wire and cable

method.

--- Part 21.Test device for vertical flame spread test of a single insulated thin wire and cable. Intended to be specified for single insulation

Test device for vertical flame spread test of thin wire and cable.

--- Part 22.Vertical flame spread test method for single insulated thin wire and cable Diffusion-type flame test method. The purpose is to determine the total

Insulated thin wires and cables with a cross-section less than 0.5mm2 and thin optical cables or conductors that may break under 1kW premixed flame conditions

Test method for vertical spread of flame on thin wires that may fuse.

--- Part 31.Vertically installed bundled wire and cable flame vertical spread test test device. The purpose is to provide for vertical

Test device for vertical flame spread of straight-mounted bundled wires and cables, and installation arrangement and calibration.

--- Part 32.Vertically installed bundled wire and cable flame vertical spread test AF/R category. The purpose is to determine the applicable

Test method for the ability of special cables to be used in special installations to inhibit the spread of flame when installed in vertical bundles.

--- Part 33.Vertical flame spread test of bundled wires and cables installed vertically Class A. The purpose is to determine the

Test for the ability of wire, cable or optical cable products to inhibit the spread of flame when installed in vertical bundles in the case of metal material volume content

method.

--- Part 34.Vertical flame spread test of bundled wires and cables installed vertically Class B. The purpose is to determine the medium for rating

Test on the ability of wire, cable or optical cable products to inhibit the spread of flame when installed in vertical bundles in the case of non-metallic material volume content

method.

--- Part 35.Vertical flame spread test of bundled wires and cables installed vertically Class C. The purpose is to determine the

Test for the ability of wire, cable or optical cable products to inhibit the spread of flame when installed in vertical bundles in the case of metal material volume content

method.

--- Part 36.Vertical flame spread test of bundled wires and cables installed vertically Class D. The purpose is to determine the very low

Test method for the ability of small cable products to inhibit the spread of flame when installed in vertical bundles in the case of non-metallic material volume content.

Fire testing of electrical and optical cables under flame conditions

Part 34.Vertically installed bundles of wires and cables

Flame Vertical Spread Test Category B

1 Scope

This document describes the Class B test method for evaluating the suppression of flame sag under specified conditions of vertically installed bundled electrical or optical cables.

The ability to spread straight.

This document applies to the cable and optical cable sample sections installed on the test steel ladder containing a total nominal volume of 3.5L/m of non-metallic materials.

The fire time is 40min. Cables and fiber optic cables are installed in front of the steel ladder. Class B is used to evaluate the volume content of medium non-metallic materials.

This test is used for type approval test. See Appendix A for the selection requirements for test cables and optical cables. Flame spread through cable and fiber optic test

The damage range of the sample is determined. This test procedure can be used to verify the ability of electrical and fiber optic cables to suppress the spread of flames.

Recommended performance requirements are given in Appendix B.

Note. The term "wire and cable" in this document includes all metal conductor insulated cables used for power or signal transmission.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations

documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to

this document.

IEC 60332-3-10 Fire tests for electrical and optical cables under flame conditions - Part 3-10.Vertically installed bundled wires and cables

Note. GB/T 18380.31-2022 Fire test of cables and optical cables under flame conditions - Part 31.Vertically installed bundled wire and cable flame

Straight propagation test test device (IEC 60332-3-10.2018, IDT)

IEC 60811-606 Electrical and optical cables - Test methods for non-metallic materials - Part 606.Methods of measuring density for physical and chemical tests

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1

ignition source ignitionsource

A source of energy that initiates combustion.

[Source. ISO 13943.2017, 3.219]

3.2

charcoal

Carbon residues from pyrolysis or incomplete combustion.

[Source. ISO 13943.2017, 3.47]