IEC 60332-3-21-2018 pdf free download.Tests on electric and optical fibre cables under fire conditions – Part 3-21: Test for vertical flame spread of vertically-mounted bunched wires or cables – Category A F/R.
This document relates only to power cables of conductor cross-sectional area greater than 35 mm2 installed on the test ladder in a spaced configuration on the front and rear to achieve a nominal total volume of non-metallic material of 7 l/m of test sample. The flame application time is 40 mm. This method of mounting is intended for special cable designs used in particular installations when required in the cable specification. Category A F/R is not intended for general use.
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 cables 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 60332-3-10, 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 60811-606, 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 termmnological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://wwwiso.org/obp
3.1 Ignition source source of energy that initiates combustion [SOURCE: ISO 13943:201 7, 3.219J
3.2 char carbonaceous residue resulting from pyrolysis or incomplete combustion [SOURCE: ISO 13943:2017. 3.47J
3.3 flame spread propagation of a flame front [SOURCE: ISO 13943:2017. 3.168J
4 Test apparatus
4.1 General
The apparatus specified in IEC 60332-3-10 shall be used.
4.2 Ignition source
The ignition source shall be one ribbon-type propane gas burner as specified in
IEC 60332-3-10.
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 7 I/rn of test sample.
The test sample for type approval shall be in accordance with Annex A.IEC 60332-3-21 pdf download.