IEC 60331-3-2018 pdf free.Tests for electric cables under fire conditions – Circuit integrity – Part 3: Test method for fire with shock at a temperature of at least 830。C for cables of rated voltage up to and including 0,6/1,0 kV tested in a metal enclosure.
This document is applicable to cables of rated voltage not exceeding 600 v/i 000 V, including those of rated voltage below 80 V. metallic data and telecom cables and optical fibre cables.
It is intended for use when testing cables not greater than 20 mm overall diameter.
This document includes details for the specific point of failure, continuity checking arrangement, test sample, test procedure and test report relevant to electric power and control cables with rated voltage up to and including 600 V/i 000 V. Details for the specific point of failure, continuity checking arrangement, test sample, test procedure and test report relevant to metallic data and telecom cables and optical fibre cables are not given by
IEC 60331-3.
Although the scope is restricted to cables with rated voltage up to and including 0.6/1.0 kV. the procedure can be used, with the agreement of the manufacturer and the purchaser, for cables with rated voltage up to and including 1 ,8/3 (3,3) kV, provided that suitable fuses are used.
It is not assumed that cables successfully assessed by this method, will also pass requirements for either lEG 60331-1 or IEC 60331-2. Testing to either of these two standards is to be carried Out separately. Such additional perlormance can be recognised by the marking in accordance with lEG 60331-1:2018 Clause 11 or IEC 60331-2:2018 Clause 11.
Annex A provides the method of verification of the burner and control system used for the test.
CAUTION — The test given in this standard may involve the use of dangerous voltages and temperatures. Suitable precautions should be taken against the risk of shock, burning, fire and explosion that may be Involved, and against any noxious fumes that may be produced.
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.
lEG 60269-3. Low-voltage fuses — Part 3: Supplementary requirements for fuses (or use by unskilled persons (fuses mainly for household and similar applications) — Examples of standardized systems of fuses A to F
IEC 60331-1:2018. Test for electric cables under fire conditions — Circuit integrity — Part 1:
Test for circuit integrity under conditions of fire with shock at a temperature of at least 830 °C for cables of rated voltage up to and including 0,6/1,0kV and with an overall diameter exceeding 20 mm
IEC 60331-2:2018. Test for electric cables under fire conditions — Circuit integrity — Part 2:
Test for circuit integrity under conditions of fire with shock at a temperature of at least 830 °C for cables of rated voltage up to and including 0,6/1,0k V and with an overall diameter not exceeding 20 mm
IEC 60584-1. Thermocouples — Part 1: EMF specifications and tolerances
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:/Iwww,iso.orglobp
circuit integrity
ability of an electric cable to continue to operate in a designated manner whilst subjected to a specified flame source for a specified period of time under specified conditions
3.2 draught-free environment
space in which the results of tests are not significantly affected by the local air speed
4 Test environment
The test shall be carried out in a draught-free environment within a suitable chamber, of minimum volume 20 m3, with facilities for disposing of any noxious gases resulting from the burning. Sufficient ventilation shall be available to sustain the flame for the duration of the test. Air inlets and the exhaust chimney should be located in such a way that the burner flame remains stable during the verification procedure and test. If necessary, the burner shall be shielded from any draughts by the use of draught shields. Windows may be installed in the walls of the chamber in order to observe the behaviour of the cable during the test. Fume exhaust should be achieved by means of natural draught through a chimney located at least 1 m from the burner. A damper may be used for adjustment of ventilation conditions.IEC 60331-3 pdf download.