IEC 60331-3 pdf download 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 part of lEC 60331 specifies the test apparatus and procedure and gives the performancerequirements,including recommended flame application times, for low-voltage power cables ofrated voltage up to and including 0,6/1,0 kV, and control cables with a rated voltage which arerequired to maintain circuit integrity when tested in a metal enclosure and when subject to fireand mechanical shock under specified conditions.
This standard describes the means of sample preparation，the continuity checkingarrangements，the electrical testing procedure，the method of burning the cables and themethod of shock production and gives requirements for evaluating test results.
NOTE All cables assessed by this method should first have been assessed against the test of lEC 60331-1 orIEC 60331-2. Such performance may be recognized by the marking according to Clause 11 of IEC 60331-1 orClause 11 of lEC 6o331-2.
Annex A provides the method of verification of the burner and control system used for the test.
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 editionof the referenced document (including any amendments) applies.
IEC 60269-3,Low-voltage fuses – Part 3: Supplementary requirements for fuses for use byunskilled persons (fuses mainly for household and similar applications) – Examples ofstandardized systems of fuses A to F
lEC 60331-1，Tests for electric cables under fire conditions – Circuit integrity – Part 1: Testmethod for fire with shock at a temperature of at least 830 °C for cables of rated voltage up toand including 0,6/1,0 kV and with an overall diameter exceeding 20 mm
IEC 60331-2，Test for electric cables under fire conditions – Circuit integrity – Part 2: Testmethod for fire with shock at a temperature of at least 830 “C for cables of rated voltage up toand including 0,6/1,0 kV and with an overall diameter not exceeding 20 mm
IEC 60584-1，Thermocouples – Part 1: Reference tables
IEC Guide 104,The preparation of safety publications and the use of basic safety publicationsand group safety publications
Terms and definitions
For the purposes of this document, the following terms and definitions apply.
4 Test conditions – Test environment
The test shall be carried out in a suitable chamber, of minimum volume 10 m 3 , with facilities for disposing of any noxious gases resulting from burning. Sufficient ventilation shall be available to sustain the flame for the duration of the test.
NOTE 1 Guidance on the choice of suitable chambers and the need for shielding is given in Annex B.