Tests on Electric Cables under Fire Conditions — Part 1: Test on a Single Vertical Insulated Wire or Cable
1 Scope
This standard specifies a method of test on a single vertical insulated wire or cable under fire conditions and the requirements for compliance.
Notes
1 Since the use of insulated wire or cable which retards flame propagation and complies with the requirement of this standard is not sufficient by itself to prevent propagation of fire under all conditions of installation, it is recommended that wherever the risk of propagation is high, for example in long vertical runs of bunches of cables, special installation precautions should also be taken. It cannot be assumed that because the sample of cable complies with the performance required in this standard a bunch of cables will behave in a similar manner. (See GB/T 18380.3-2001)
2 The method specified is not suitable for the testing of small wires, less than 0,8 mm diameter or small strands less than 0.5 mm2 because the conductor melts before the test is completed. (See GB/T 18380.2-2001)
2 Normative References
The following normative document contains provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the edition indicated was valid. All normative documents are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below.
IEC 60695-2-4/1:1991 Fire Hazard Testing — Part 2: Test Methods — Section 4 — Sheet 1: 1 kW Nominal Pre-mixed Test Flame and Guidance (idt IEC 60695-4:1993)
3 Sample
The test sample shall be a piece of the finished wire or cable (600 ± 25) mm long.
4 Conditioning
Before testing, all test pieces shall be conditioned at (23 ± 5) °C for not less than 16 h at a relative humidity of (50 ± 20)%.
In the case of insulated wire or cable with a finish of paint or lacquer, this conditioning shall follow an initial period where the test piece shall be kept at a temperature of (60 ± 2) °C for 4 h.
5 Test Apparatus
The test apparatus and arrangement are illustrated in Figures 1 and 2.
The test apparatus shall be contained within a suitable chamber, substantially free from draughts during the test duration, but with facilities for disposing of noxious gases resulting from burning. The chamber shall be maintained at a temperature of (23 ± 10) °C.
Foreword II
IEC Foreword IV
Introduction VI
1 Scope
2 Normative References
3 Sample
4 Conditioning
5 Test Apparatus
6 Arrangement of Test Piece
7 Ignition Source
8 Test Procedure
9 Performance Requirements
Annex A (Informative) Bibliography
Annex B (Normative) 1 kW Nominal Test Flame Apparatus and Confirmation of the Test Flame
