AS NZS IEC-60331-1-2017 pdf download.Tests on electric and optical fibre cables under fire conditions Part 3.22: Test for vertical flame spread of vertically-mounted bunched wires or cables- Category A.
The series of International Standards covered by Parts 3-10, 3-21, 3-22, 3-23, 3-24 and 3-25 of IEC 60332 specifies methods of test for the assessment of vertical flame spread of vertically- mounted bunched wires or cables, electrical or optical, under defined conditions. NOTE For the purpose of this standard the term “electric wire or cable” covers all insulated metallic conductor cables used for the conveyance of energy or signals. 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 may be used to demonstrate the cable’s ability to limit flame spread. This part of IEC 60332 covers category A and relates to cables installed on the test ladder to achieve a nominal total volume of non-metallic material of 7 I/m of test sample.
The flame application time is 40 min. The method of mounting uses the front of the ladder, a standard or wide ladder being used for cables having a conductor cross-section greater than 35 mm2 according to the number of test pieces required, and a standard ladder for conductor Cross- sections 35 mm2 and smaller. The category is intended for general use where high volumes of non-metallic material are required to be evaluated. A recommended performance requirement is given in annex B.
2 Normative references
The following referenced documents are indispensable for the application 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 60332-3-10,Tests on electric cables under fire conditions – Part 3-10: Test for vertical flame spread of vertically-mounted bunched wires or cables – Apparatus
IEC 60695-4, Fire hazard testing – Part 4: Terminology concerning fire tests
IEC 60811-1-3, Insulating and sheathing materials of electric cables – Common test methods Part 1: General application – Section 3: Methods for determining the density – Water absorption tests – Shrinkage test
IEC Guide 104, The preparation of safety publications and the use of basic safety publications and group safety publications
3 Definitions
For the purpose of this part of IEC 60332 the following definitions apply. The definitions are
taken from IEC 60695-4.
3.1 ignition source
source of energy that initiates combustion
3.2 char
carbonaceous residue resulting from pyrolysis or incomplete combustion
3.3 flame spread
propagation of a flame front
4 Test apparatus
4.1 General
The apparatus specified in IEC 60332-3- 10 shall be used.
4.2 lgnition source
The ignition source shall be one or two ribbon-type propane gas burners as specified in IEC 60332-3-10.
A single burner shall be used with the standard ladder and two burners with the wide ladder.AS NZS IEC-60331-1 pdf download.