GB/T 17651.2-2021Measurement of smoke density of cables or optical fiber cables burning under defined conditions - Part 2: Test procedure and requirements (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"

Drafting.

This document is the second part of GB/T 17651 "Determination of Smoke Density of Cables or Optical Cables Burning under Specific Conditions". GB/T 17651

The following parts have been released.

---Part 1.Test device;

---Part 2.Test procedures and requirements.

This document replaces GB/T 17651.2-1998 "Determination of smoke density of cables or optical cables burning under specific conditions-Part 2.Tests

Steps and Requirements'', compared with GB/T 17651.2-1998, in addition to structural adjustments and editorial changes, the main technical changes are as follows.

---Added the applicable documents of normative reference documents (see Chapter 2);

--- Added applicable documents of terms and definitions (see Chapter 3);

---The general requirements for the selection of the number of specimens have been added (see 5.2.1.1);

---Modified the selection of the number of specimens with the outer diameter of the cable or optical cable less than or equal to 5.0mm and not less than 1.0mm (see 5.2.1.3,

Introduction

The smoke density of a cable or optical cable is an important indicator for evaluating the burning performance of a cable or optical cable. In the event of a fire, the cable or optical cable

The low-smoke characteristics of the company ensure the safe evacuation of all types of personnel and the normal development of fire and rescue work, and it is important for social public safety and reducing fire losses.

Has an important role. GB/T 17651 is a basic test method for determining the smoke emission of cables or optical cables in the event of a fire. GB/T 17651

It aims to establish a test method standard for the smoke density of different wire and cable or optical cable products burning under specific conditions. It is proposed to be composed of the following two parts.

Sub-composition.

---Part 1.Test device. The purpose is to establish a test suitable for the determination of the smoke density of cables or optical cables burning under specific conditions.

Requirements for testing devices and qualification approval procedures for testing devices.

---Part 2.Test procedures and requirements. The purpose is to establish a test for the determination of the smoke density of a cable or optical cable burning under specific conditions.

Inspection procedures and recommended compliance requirements.

GB/T 17651 is issued in two parts, which together specify a method for determining the smoke density of a cable or optical cable burning under specific conditions.

law. Users of this test method should note that the number of samples and bundles of cables or optical cables in the test may not represent the actual installation.

Happening.

Part 1 introduces in detail the test equipment and the combination of the test equipment used to determine the smoke density of cables or optical cables burning under specific conditions.

Lattice recognition. It includes a test chamber with a volume of 27m3, a light measuring device for light measurement, standard fire source, smoke mixing, blank test and test equipment

Detailed information about the conformity accreditation procedures set up. Appendix A provides guidance on various aspects of the test device.

It may be useful in case inspection.

Part 2 gives the test procedures, and when specific requirements are not given in a specific cable standard or specification, the informative appendix gives a recommendation.

Recommended compliance requirements.

Cable or fiber optic cable burns under certain conditions

Determination of smoke density. Part 2.Test procedures and requirements

1 Scope

This document describes the test procedure used to determine the density of smoke released by a cable or optical fiber

The preparation, assembling and burning methods of test cables or optical cable samples are recommended for the requirements for evaluating test results.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations

Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to

This document.

IEC 60695-4 Fire hazard testing for electrical and electronic products Part 4.Firehazard testing terms (Firehazard testing-

Part 4.Terminologyconcerningfiretestsforelectrotechnicalproducts)

IEC 60811-203 General test methods for non-metallic materials of electric and optical cables-Part 203.General test methods Thickness and outer diameter

Shape size measurement (Electricandopticalfibrecables-Testmethodsfornon-metalicmaterials-Part 203.

Generaltests-Measurementofoveraldimensions)

IEC 61034-1 Determination of smoke density of cables or optical cables burning under specific conditions Part 1.Test equipment (Measurement

ofsmokedensityofcablesburningunderdefinedconditions-Part 1.Testapparatus)

ISO /IEC 13943.2000 Firesafety-Vocabulary

3 Terms and definitions

The terms and definitions defined by IEC 60695-4 and ISO /IEC 13943.2000 apply to this document.

4 Test device

The test procedures specified in this document should use the test equipment given by IEC 61034-1, namely the test box, the light measuring device and the standard fire source.

get on.

5 Test preparation