Tests on electric and optical fibre cables under fire conditions - Part 22: Test for vertical flame propagation for a single small insulated wire or cable - Procedure for diffusion
1 Scope
This part of GB/T 18380 specifies the procedure for testing the resistance to vertical flame propagation for a single small vertical electrical insulated conductor or cable, or optical cable, under fire conditions. The apparatus is given in GB/T 18380.21-2008.
This standard gives the procedure for testing small optical fibre cables or a small insulated conductor or cable when the method specified in GB/T 18380.12-2008 is not suitable because some small optical fibre cables may break or small conductors may melt during the application of the flame. The recommended range of application is for the testing of small single insulated conductors or cables of less than 0.5mm² cross-section.
Note: Since the use of insulated conductor or cable which retards flame propagation and complies with the recommended requirements 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 test sample of cable complies with the performance requirements recommended in this standard, that a bunch of cables will behave in a similar manner. (See GB/T 18380.31~36. serious.)
Recommended requirements for performance are given in Annex A.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of GB/T 18380. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this part. However parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 16499-1996 Guide to the Drafting of Electrical Safety Standards (eqv IEC Guide 104:1984)
GB/T 18380.21-2008 Tests on Electric and Optical Fibre Cables under Fire Conditions - Part 21: Test for Vertical Flame Propagation for a Single Small Insulated Wire or Cable – Apparatus (IEC 60332-2-1:2004, IDT)
IEC 60695-4:1993 Fire Hazard Testing – Part 4: Terminology Concerning Fire Tests
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply. The terms and definitions are taken from GB/T 18380.
3.1
ignition source
source of energy that initiates combustion
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Test Apparatus
5 Test Procedure
6 Evaluation of Test Results
Annex A (Informative) Recommended Performance Requirements
