This British Standard describes a method for assessment of the fire integrity of large diameter power cables for use as components for smoke and heat control systems as given in BS 7346-6, and certain other active fire safety systems. It is applicable to cables of rated voltage not exceeding 600\/1 000 V and of overall diameter greater than 20 mm.<\/p>\n
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| 3<\/td>\n | Contents 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Test chamber 1 5 Apparatus 2 6 Verification procedure for the source of heat 11 7 Test specimens 12 8 Test procedure 15 9 Test report 18 Annexes Annex A (informative) Guidance on the provision of a suitable test chamber 19 Bibliography 20 List of figures Figure 1 – Schematic of the test configuration 5 Figure 2 – Plan view of apparatus 6 Figure 3 – End elevation view of apparatu 7 Figure 4 – Rubber bush 8 Figure 5 – Arrangement of holes on burner face 8 Figure 6 – Position of water jet device 9 Figure 7 – Temperature measuring arrangement 10 Figure 8 – Example of mounting of a larger diameter test specimen 13 Figure 9 – Example of mounting of a smaller diameter test specime 14 Figure 10 – Basic circuit diagram 16 <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | Foreword <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions 4 Test chamber <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 5 Apparatus <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | Figure 1 Schematic of the test configuration <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | Figure 2 Plan view of apparatus <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | Figure 3 End elevation view of apparatu <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | Figure 4 Rubber bush Figure 5 Arrangement of holes on burner face <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | Figure 6 Position of water jet device <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | Figure 7 Temperature measuring arrangement <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 6 Verification procedure for the source of heat a) the overall arithmetic mean of the readings from the two thermocouples over the 10 min period falls within the temperature range \u02daC; and b) the difference between the mean readings from each of the two thermocouples over the 10 min period does not exceed 40 \u02daC. <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 7 Test specimens 7.1 Specimen preparation 7.2 Test specimen mounting <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | Figure 8 Example of mounting of a larger diameter test specimen <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | Figure 9 Example of mounting of a smaller diameter test specime <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 8 Test procedure 8.1 Electrical connections to the test specimen a) connect each phase conductor, or group of conductors, to one terminal of a suitable load and an indicating device (see 5.2), such that a current for circuit continuity checking is achieved, the other terminal of each device being earthed; b) connect the neutral conductor and any protective conductor to one terminal of a load and indicating device (see 5.2), the oth… <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Figure 10 Basic circuit diagram <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 8.2 Setting up the apparatus and starting the test 8.3 Test voltage application 8.4 Application of impacts 8.5 Duration of flame application with impact phase 8.6 Water drenching phase <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 8.7 Assessment of test specimen performance a) one of the fuses blows or one of the circuit breakers interrupts the circuit; or b) a conductor in the test specimen ruptures, as indicated by one of the circuit continuity indicating devices (e.g. a lamp extinguishes). 8.8 Recording of results 9 Test report a) the number and date of this British Standard; b) a full description of the cable tested; c) the name and address of the manufacturer of thecable tested; d) the test voltage; e) the actual bending radius of the test specimen used for the test; f) the type(s) and arrangement of fixings used to attach the test specimen to the test ladder; g) the survival time achieved. <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | Annex A (informative) Guidance on the provision of a suitable test chamber <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Method for assessment of fire integrity of large diameter power cables for use as components for smoke and heat control systems and certain other active fire safety systems<\/b><\/p>\n |