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IEC 60332-3-25-2018 pdf free download

IEC 60332-3-25-2018 pdf free download.Tests on electric and optical fibre cables under fire conditions – Part 3-25: Test for vertical flame spread of vertically-mounted bunched wires or cables – Category D.
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 lEG maintain terminological databases for use in standardization at the following addresses:
• lEG 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
ISOURCE: ISO 13943:2017, 3.2191
3.2 char carbonaceous residue resulting from pyrolysis or incomplete combustion
ISOURCE: ISO 13943:2017, 3.47J
3.3 flame spread propagation of a flame front
ISOURCE: ISO 13943:2017, 3.1681
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 0,5 I/rn of test sample.
The test sample for type approval shall be in accordance with Annex A.
5.2 Determination of the number of test pieces
In order to calculate the appropriate number of test pieces, it is necessary to determine the volume per metre of non-metallic material of one test piece.
A length of cable which shall be not less than 0,3 m long is carefully cut to ensure that the surfaces are at right angles to the cable axis, thus enabling precise measurements of its length.
The density of each non-metallic component (Including cellular material) shall be measured in an appropriate way, for example according to lEG 60811-606, in order to obtain values expressed to the second decimal place.
Each non-metallic material C shall be removed from the test piece and weighed. Any nonmetallic material making up less than 5 % of the total non-metallic mass of the test piece shall be assumed to have a density of 1 0 kgfdm3.
Where semi-conducting screens cannot be removed from the insulating material, the components may be considered as one for the purpose of measuring their mass and density.IEC 60332-3-25 pdf free download.

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