1、BRITISH STANDARD C ornrnunic at ion cables Specifications for test methods Part 4- 1 1 : Environmental test methods - A horizontal integrated fire test method The European Standard EN 502894-1 1:2002 has the status of a British Standard ICs 13.220.40; 33.120.10 BS EN 50289-4-1 1 2002 WkNb A%“ U- rn%
2、 E rn NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW $ present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them i
3、n the UK. - A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section e
4、ntitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Comp
5、liance with a British Standard does not ofitself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 32, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates
6、 when the document was last issued. OBSI 3 May 2002 ISBN O 580 39591 X EUROPEAN STANDARD EN 50289-4-1 I NORME EUROPENNE EUROPISCHE NORM March 2002 ICs 13.220.40: 33.120.10 English version Communication cables - Specifications for test methods Part 4-1 1 : Environmental test methods - A horizontal in
7、tegrated fire test method Cbles de communication - S pcif ications des mthodes dessai Partie 4-1 1 : Mthodes dessais denvironnement - Mthode intgre dessai horizontal au feu Kom m u n i kations ka bel - S pezif i kat ion en fr Prfvetfa h ren Teil 4-1 1 : Umweltprfvetfahren - Horizon tale Brand pr f u
8、 n g This European Standard was approved by CENELEC on 2001-11-01. CENELEC members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographi
9、cal references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a
10、CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national eledrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg,
11、Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brus
12、sels O 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50289-4-1 1:2002 E EN 50289-4-1 1 :2002 -2- Foreword This European Standard was prepared by SC46XC, Multicore, Multipair and Quad Data communication cables, of Technical
13、Committee CENELEC TC 46X, Communication cables. The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50289-4-1 1 on 2001 -1 1-01. The following dates were fixed: - latest date by which the EN has to be implemented at national level by publication of an identical n
14、ational standard or by endorsement (dop) 2002-1 0-01 - latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2004-08-01 Annexes designated “normative“ are part of the body of the standard. Annexes designated “informative“ are given for information only. In th
15、is standard, annex A is normative and annexes B and C are informative. This European Standard has been prepared under the European Mandate M/212 given to CENELEC by the European Commission and the European Free Trade Association. -3- Con tents EN 50289-4-1 1 :2002 Page Scope 5 Normative references 5
16、 Definitions. symbols and abbreviations 5 Test environment . 5 Test apparatus . 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 5.10 5.1 1 5.12 5.13 5.14 5.15 5.16 5.17 Air-inlet chamber . 6 Air-inlet shutter 6 Fire-test chamber 7 Gas burner 7 Removable top cover 9 Exhaust transition . 10 Exhaust duct . 10 Ex
17、haust duct velocity measurement system . 10 Smoke measurement system . 11 Smoke release rate measurement system 12 Exhaust duct damper 12 Exhaust blower . 12 Fire-test chamber airflow system 12 Ladder cable tray 13 Fire-test chamber temperature measurement instruments . 14 Data acquisition equipment
18、 . 14 Heat release rate measurement system . 15 Test specimens 15 Calibration and maintenance of test equipment . 16 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 Maintenance . 16 Frequency of calibration 16 Airflow . 16 7.3.1 Air leakage test 16 7.3.2 Supplemental air leakage test . 16 7.3.3 Velocity traverse te
19、st . 16 Smoke measurement system calibration test 17 Fuel 17 Reinforced inorganic cement board test . 18 7.6.1 Temperature preheat . 18 7.6.2 Temperature history test 18 Standard insulated conductor test . 19 Procedures for calibration of heat release rate measurement equipment . 20 7.8.1 Analyser c
20、alibration . 20 7.8.2 Delay time . 20 7.8.3 Calibration test 20 EN 50289-4-1 1 :2002 -4- 8 9 10 11 12 Test specimen preparation . 21 Determination of specimen diameter 21 Number of cable lengths . 21 Test procedures . 22 Flame propagation distance and smoke measurement test procedure . 22 8.1 Specim
21、en conditioning 21 8.2 8.3 8.4 Cable mounting . 22 9.1 9.2 9.3 9.4 Heat release test procedure 23 Time-to-ignition test procedure . 23 Flaming droplets/particles test procedure . 23 Post-test clean-up and inspection . 23 Smoke measurement system post-test procedure 23 Heat release rate post-test pro
22、cedure . 24 Calculations . 24 Optical density of smoke . 24 Smoke release rate calculation . 25 Exhaust duct velocity measurement calculations 25 Exhaust duct volumetric flow rate calculations 26 Heat release rate calculations . 26 1 1.5.1 Peak heat release rate 26 11 5.2 Total heat released 27 11.6
23、 Time-to-ignition calculations . 27 Flaming droplets/particles calculations 27 1 O . 1 10.2 11 . 1 11.2 11.3 11.4 1 1.5 1 1.7 Report . 27 Annex A (normative) . 28 Annex B (informative) . 29 Annex C (informative) . 30 LIST OF FIGURES AND TABLES Figure 1 Schematic of the air-inlet chamber . 6 Figure 2
24、 Schematic of the fire-test chamber . 8 Figure 3 Cross-section of the fire-test chamber (section B.B. Figure 2) . 9 Schematic of the section . 11 Figure 5 Smoke section 12 Figure 6 Location of section. smoke section . 13 Details of ladder cable tray and supports . 14 Figure 8 Schematic of gas sampli
25、ng system 15 Temperature history of inorganic reinforced cement board at thermocouple in air (7 m) . 19 Figure C.1 Location of bricks . 31 Table C.1 Sizes of bricks 32 Figure 4 Figure 7 Figure 9 -5- EN 50289-4-1 1 :2002 1 Scope This Part 4-11 of EN 50289 specifies a horizontal integrated fire test m
26、ethod for determining flame-propagation distance, optical smoke density, total heat release, heat release rate, time to ignition and flaming d roplets/particles for com mu n cat ion cables . The cables are tested in a representative installed condition. 2 Normative references This standard incorpora
27、tes by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the cited publications are listed hereafter. For dated references, subsequent amendments to or revisions of these publications apply to this European
28、Standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the cited publication applies, together with any amendments. EN 60695-4 Fire hazard testing - Part 4: Terminology concerning fire tests (IEC 60695-4) 3 Definitions For the purposes apply: of
29、 this European Standard, the definitions of EN 60695-4 and the following 3.1 flame travel distance distance that the flame travels beyond the extent of the gas burner flame 3.2 optical density of smoke (OD) smoke obscuration described in terms of logarithmic ratio of initial light intensity to insta
30、ntaneous light intensity 3.3 time-to-igni tion first occurrence of initiation of combustion 4 Test environment The fire-test room in which the test chamber and smoke measurement system are located shall have provision for a free inflow of air to maintain the room at controlled pressure of O Pa to 12
31、 Pa of water column greater than ambient barometric pressure and at a temperature of 23 “C f 3 “C and relative humidity of 50 % f 5 % throughout each test run. The fire-test room and smoke measurement area shall have controllable lighting. 5 Test apparatus The fire-test apparatus shall consist of th
32、e following: a) air-inlet chamber; b) air-inlet shutter; EN 50289-4-1 1 :2002 -6- fire-test chamber; gas burner; removable top cover; exhaust transi ti on; exhaust duct; exhaust duct velocity measurement system; smoke measurement system; exhaust duct damper; exhaust blower; heat release rate measure
33、ment system. Air-i nlet chamber The fire-test chamber air-inlet transition shall consist of an L-shaped galvanised steel unit secured to the air-inlet end of the fire-test chamber. The unit shall contain a 300 mm f 6 mm x 464 mm f 6 mm rectangular opening to allow air to enter the fire-test chamber
34、through the chamber air-inlet shutter. A schematic of the air-inlet chamber is shown in Figure I. 5.2 Air-inlet shutter A vertically sliding shutter, extending the entire width of the test chamber, shall be provided at the air-inlet end of the fire-test chamber. The shutter shall be positioned to pr
35、ovide an air-inlet opening of 76 mm f 2 mm high, measured from the floor level of the test chamber and across the full width of the chamber, as shown in Figure 1 (see also Figure 2). NOTE Tolerances are contained in applicable subclauses. Figure 1 - Schematic of the air-inlet chamber -7- EN 50289-4-
36、1 1 :2002 5.3 Fire-test chamber The fire-test chamber shall consist of a horizontal duct of the shapes and sizes shown in Figure 2 and Figure 3. The sides and base of the duct shall be lined with insulating masonry, consisting of refractory fire brick, as illustrated in Figure 3. One side shall be p
37、rovided with a row of two panes of 6 mm thick high temperature glass pressure tight observation windows, with the inside pane mounted flush with the inner wall (see Figure 3). The exposed window area shall be 70 mm f 6,4 mm x 280 mm f 38 mm). The windows shall be located so that the gas burner and t
38、he length of the specimens being tested, from the point at which the test fire ends, can be observed from outside the fire-test chamber. The top cover support ledges shall be fabricated of a structural material capable of withstanding abuse of continuous testing. The ledges shall be level with respe
39、ct to length and width of the chamber and with respect to each other. To provide air turbulence for combustion, turbulence baffles shall be provided by positioning six 229 mm x 114 mm x 64 mm thick refractory fire bricks (long dimension vertical and 114 mm dimension parallel to the wall) along the s
40、ide walls of the chamber at distances of 2,13 m f 152 mm, 3,66 m f 152 mm, and 6,lO m f 152 mm, on the window side (do not obstruct the windows) and 1,37 m f 152 mm, 2,90 m f 152 mm, and 4,88 m f 152 mm on the opposite side, as measured from the center line of the gas burner to the center line of th
41、e fire bricks. 5.4 Gas burner One end of the test chamber, designated as the air-inlet end in Figure 2, shall be provided with a dual port gas burner, delivering flames upward, to engulf the test specimens. As shown in Figure 3, the burner shall be positioned transversely to each side of the center
42、line of the furnace so that the flame is evenly distributed over the width of the specimens. The burner shall be spaced 292 mm f 6 mm from the air-inlet end of the test chamber, and 191 mm f 6 mm below the removable top cover (see Figure2 and Figure 3). The burner shall be located 1 320 mm f 51 mm d
43、ownstream of the air-inlet shutter, as measured from the burner center line to the outside surface of the shutter. Gas to the burner shall be provided through a single inlet pipe, distributed to each port burner through a tee-section. The outlet shall be a nominal 19 mm elbow. The plane of the ports
44、 shall be parallel to the chamber floor, such that the gas is directed upward toward the specimen. Each port shall be positioned with its center line 102 mm f 6 mm on each side of the center line of the fire-test chamber so that the burner flame is evenly distributed (see Figure 3). The gas burner s
45、hould be ignited remotely using an electronic ignition system. The controls used to maintain a constant flow of methane gas to the burners shall consist of the following: a) a pressure regulator; b) a gas meter calibrated to read in increments of not more than 2,8 I; c) a gauge to indicate gas press
46、ure in Pa (or inches of water); d) a quick-acting gas shutoff valve; e) a gas metering valve; f) an orifice plate in combination with a manometer to assist in maintaining uniform gas-flow conditions. Alternative control equipment, if shown to be equivalent, shall be permitted EN 50289-4-1 1 :2002 -8
47、- NOTE Tolerances are contained in applicable subclauses. Figure 2 - Schematic of the fire test chamber -9- EN 50289-4-1 1 :2002 NOTE Tolerances are contained in applicable subclauses. Figure 3 - Cross-section of the fire test chamber (section B-B, Figure 2) 5.5 Removable top cover The removable top
48、 cover shall consist of a metal and mineral insulation composite unit whose insulation consists of nominal 51 mm f 6 mm thick mineral composition material. The top unit is shown in Figure 3 and shall completely cover the fire-test chamber. The metal and mineral composite material shall have physical
49、 characteristics as follows: a) maximum effective use temperature of not less than 650 OC; b) bulk density of 335 kg/m3 f 20 kg/m3 ; c) thermal conductivity of 0,072 W/(m.K) to 0,102 W/(m.K) at 150 OC to 370 OC; d) K,C product of 1 x 104 (W2.s)/(m2.K2) to 4 x 104 (W2.s)/(m2.K2). K,C is equal to the thermal conductivity times the density times the specific heat. The entire top-panel unit shall be protected with flat sections of high-density (nominally 1 760 kg/m3 6 mm thick) mineral-fibrekement board maintained in an unwarped and uncracked condition thro
