TESTS ON ELECTRIC CABLES UNDER FIRE CONDITIONS - PART 3-21: TEST FOR VERTICAL FLAMES SPREAD OF VERTICALLY-MOUNTED BUNCHED WIRES OR CABLES - CATEGORY A F/R
International Electrotechnical Committee
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Definitions
4 Test apparatus
4.1 General
4.2 Ignition source
5 Test procedure
5.1 Test sample
5.2 Determination of the number of test pieces
5.3 Mounting of the test sample
5.4 Flame application time
6 Evaluation of test results
7 Performance requirements
8 Retest procedure
9 Test report
Annex A (normative) Guidance on cable selection for type
approval testing
Annex B (informative) Recommended performance requirements
Figure 1 - Typical arrangement and spacing of cables mounted
on both sides of the standard ladder (category
A F/R)
Table A.1 - Summary of test conditions
Defines the category A F/R and relates only to power cables of conductor cross-sectional area greater than 35mm square, installed on the test ladder in a spaced configuration on the rear and front to achieve a nominal total volume of non-metallic material of 7 l/m of test sample. Intended for special cable designs used particularly of installations when the cable specification is required. Not intended for use in category A F/R. The application time is 40 minutes.
| Document Type | Standard |
| Status | Current |
| Publisher | International Electrotechnical Committee |
| Committee | TC 20 |
| Supersedes |
|
