IEC 60332-3-24-2018 pdf download.Tests on electric and optical fibre cables under fire conditions – Part 3-24: Test for vertical flame spread of vertically-mounted bunched wires or cables – Category C.
This part of IEC 60332 covers category C for methods of test for the assessment of vertical flame spread of vertically mounted bunched wires or cables, electrical or optical, under defined conditions.
This document relates to cables installed on the test ladder to achieve a nominal total volume of non-metallic material of 1 ,5 l/m of test sample. The flame application time is 20 min. The method of mounting uses the front of the standard ladder. The category is intended for general use where low volumes of non-metallic material are required to be evaluated.
The test is intended for type approval testing. The requirements for the selection of cables for testing are given in Annex A. The flame spread is measured as the extent of damage of the cable sample. This procedure can be used to demonstrate the cable’s ability to limit flame spread.
A recommended performance requirement is given in Annex B.
NOTE For the purposes of this document the term “electric wire or cable” covers all insulated metallic conductor cables used for the conveyance of energy or signals.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60332-3-1 0, Tests on electric and optical fibre cables under fire conditions – Part 3-10:
Test for vertical flame spread of vertically-mounted bunched wires or cables – Apparatus
IEC 6081 1 -606, Electric and optical fibre cables – Test methods for non-metallic materials – Part 606: Physical tests – Methods for determining the density
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 ignition source
source of energy that initiates combustion
[SOURCE: ISO 1 3943:201 7, 3.21 9]
3.2 char
carbonaceous residue resulting from pyrolysis or incomplete combustion
[SOURCE: ISO 1 3943:201 7, 3.47]
3.3 flame spread
propagation of a flame front
[SOURCE: ISO 1 3943:201 7, 3.1 68]
4 Test apparatus
4.1 General
The apparatus specified in IEC 60332-3-1 0 shall be used.
4.2 Ignition source
The ignition source shall be one ribbon-type propane gas burner as specified in IEC 60332-3-1 0.
5 Test procedure
5.1 Test sample
The test sample shall comprise a number of test pieces of cable from the same production length, each having a minimum length of 3,5 m.
The total number of test pieces in the test sample shall be that number required to provide a nominal total volume of non-metallic material of 1 ,5 l/m of test sample.
The test sample for type approval shall be in accordance with Annex A.
The test pieces forming the test sample shall be conditioned at a temperature of (20 ± 1 0) °C for at least 1 6 h before commencing the test. The test pieces shall be dry.IEC 60332-3-24 pdf download.