Test on electric and optical fibre cables under fire conditions - Part 12: Test for vertical flame propagation for a single insulated wire or cable - Procedure for 1kW pre-mixed fla
1 Scope
This part of GB/T 18380 specifies the procedure for testing the resistance to vertical flame propagation for a single vertical electrical insulated conductor or cable, or optical fibre cable, under fire conditions. The apparatus is given in GB/T 18380.11-2008.
Note 1: Testing to GB/T 18380.12-2008 may be performed simultaneously with that to GB/T 18380.13-2008 if required.
Recommended requirements for performance are given in Annex A.
This part specifies the use of a 1 kW pre-mixed flame and is for general use, except that the procedure specified may not be suitable for the testing of small single insulated conductors or cables of less than 0.5 mm2 total cross-section because the conductor melts before the test is completed, or for the testing of small optical fibre cables because the cable is broken before the test is completed. In these cases, the procedure given in GB/T 18380.22-2008 is recommended.
Note 2: 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 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 to GB/T 18380.36 series).
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 standard. 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 18380.11-2008 Test on Electric and Optical Fibre Cables under Fire Conditions — Part 11:Test for Vertical Flame Propagation for a Single Insulated Wire or Cable — Apparatus (IEC 60332-1-1:2004, IDT)
IEC 60695-4:1993 Fire Hazard Testing — Part 4: Terminology Concerning Fire Tests
3 Terms and Definitions
