SIST EN 50289-4-11:2002
(Main)Communication cables - Specifications for test methods -- Part 4-11: Environmental test methods - A horizontal integrated fire test method
Communication cables - Specifications for test methods -- Part 4-11: Environmental test methods - A horizontal integrated fire test method
This Part 4-11 of EN 50289 specifies a horizontal integrated fire test method for determining flame-propagation distance, optical smoke density, total heat release, heat release rate, time to ignition and flaming droplets/particles for communication cables.
The cables are tested in a representative installed condition.
Kommunikationskabel - Spezifikationen für Prüfverfahren -- Teil 4-11: Umweltprüfverfahren - Horizontale Brandprüfung
Câbles de communication - Spécifications des méthodes d'essai -- Partie 4-11: Méthodes d'essais d'environnement - Méthode intégrée d'essai horizontal au feu
Communication cables - Specifications for test methods - Part 4-11: Environmental test methods - A horizontal integrated fire test method
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Communication cables - Specifications for test methods - Part 4-11: Environmental test methods - A horizontal integrated fire test methodKommunikationskabel - Spezifikationen für Prüfverfahren -- Teil 4-11: Umweltprüfverfahren - Horizontale BrandprüfungCâbles de communication - Spécifications des méthodes d'essai -- Partie 4-11: Méthodes d'essais d'environnement - Méthode intégrée d'essai horizontal au feuCommunication cables - Specifications for test methods -- Part 4-11: Environmental test methods - A horizontal integrated fire test method33.120.10Koaksialni kabli. ValovodiCoaxial cables. Waveguides13.220.40Sposobnost vžiga in obnašanje materialov in proizvodov pri gorenjuIgnitability and burning behaviour of materials and productsICS:Ta slovenski standard je istoveten z:EN 50289-4-11:2002SIST EN 50289-4-11:2002en01-september-2002SIST EN 50289-4-11:2002SLOVENSKI
STANDARD
SIST EN 50289-4-11:2002
EUROPEAN STANDARDEN 50289-4-11NORME EUROPÉENNEEUROPÄISCHE NORMMarch 2002CENELECEuropean Committee for Electrotechnical StandardizationComité Européen de Normalisation ElectrotechniqueEuropäisches Komitee für Elektrotechnische NormungCentral Secretariat: rue de Stassart 35, B - 1050 Brussels© 2002 CENELEC -All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.Ref. No. EN 50289-4-11:2002 EICS 13.220.40; 33.120.10English versionCommunication cables –Specifications for test methodsPart 4-11: Environmental test methods –A horizontal integrated fire test methodCâbles de communication –Spécifications des méthodes d'essaiPartie 4-11: Méthodes d'essaisd'environnement –Méthode intégrée d'essaihorizontal au feuKommunikationskabel –Spezifikationen für PrüfverfahrenTeil 4-11: Umweltprüfverfahren -Horizontale BrandprüfungThis European Standard was approved by CENELEC on 2001-11-01. CENELEC members are bound tocomply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration.Up-to-date lists and bibliographical references concerning such national standards may be obtained onapplication to the Central Secretariat or to any CENELEC member.This European Standard exists in three official versions (English, French, German). A version in any otherlanguage made by translation under the responsibility of a CENELEC member into its own language andnotified to the Central Secretariat has the same status as the official versions.CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.SIST EN 50289-4-11:2002
EN 50289-4-11:2002- 2 -ForewordThis European Standard was prepared by SC 46XC, Multicore, Multipair and Quad Datacommunication cables, of Technical Committee CENELEC TC 46X, Communication cables.The text of the draft was submitted to the formal vote and was approved by CENELEC asEN 50289-4-11 on 2001-11-01.The following dates were fixed:-latest date by which the EN has to be implementedat national level by publication of an identicalnational standard or by endorsement(dop)2002-10-01-latest date by which the national standards conflictingwith the EN have to be withdrawn(dow)2004-08-01Annexes designated "normative" are part of the body of the standard.Annexes designated "informative" are given for information only.In this 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 toCENELEC by the European Commission and the European Free Trade Association.___________SIST EN 50289-4-11:2002
- 3 -EN 50289-4-11:2002ContentsPage1Scope.52Normative references.53Definitions, symbols and abbreviations.54Test environment.55Test apparatus.55.1Air-inlet chamber.65.2Air-inlet shutter.65.3Fire-test chamber.75.4Gas burner.75.5Removable top cover.95.6Exhaust transition.105.7Exhaust duct.105.8Exhaust duct velocity measurement system.105.9Smoke measurement system.115.10Smoke release rate measurement system.125.11Exhaust duct damper.125.12Exhaust blower.125.13Fire-test chamber airflow system.125.14Ladder cable tray.135.15Fire-test chamber temperature measurement instruments.145.16Data acquisition equipment.145.17Heat release rate measurement system.156Test specimens.157Calibration and maintenance of test equipment.167.1Maintenance.167.2Frequency of calibration.167.3Airflow.167.3.1Air leakage test.167.3.2Supplemental air leakage test.167.3.3Velocity traverse test.167.4Smoke measurement system calibration test.177.5Fuel.177.6Reinforced inorganic cement board test.187.6.1Temperature preheat.187.6.2Temperature history test.187.7Standard insulated conductor test.197.8Procedures for calibration of heat release rate measurement equipment.207.8.1Analyser calibration.207.8.2Delay time.207.8.3Calibration test.20SIST EN 50289-4-11:2002
EN 50289-4-11:2002- 4 -8Test specimen preparation.218.1Specimen conditioning.218.2Determination of specimen diameter.218.3Number of cable lengths.218.4Cable mounting.229Test procedures.229.1Flame propagation distance and smoke measurement test procedure.229.2Heat release test procedure.239.3Time-to-ignition test procedure.239.4Flaming droplets/particles test procedure.2310Post-test clean-up and inspection.2310.1Smoke measurement system post-test procedure.2310.2Heat release rate post-test procedure.2411Calculations.2411.1Optical density of smoke.2411.2Smoke release rate calculation.2511.3Exhaust duct velocity measurement calculations.2511.4Exhaust duct volumetric flow rate calculations.2611.5Heat release rate calculations.2611.5.1Peak heat release rate.2611.5.2Total heat released.2711.6Time-to-ignition calculations.2711.7Flaming droplets/particles calculations.2712Report.27Annex A (normative).28Annex B (informative).29Annex C (informative).30LIST OF FIGURES AND TABLESFigure 1Schematic of the air-inlet chamber.6Figure 2Schematic of the fire-test chamber.8Figure 3Cross-section of the fire-test chamber (section B-B, Figure 2).9Figure 4Schematic of the section .11Figure 5Smoke section .12Figure 6Location of section, smoke section .13Figure 7Details of ladder cable tray and supports.14Figure 8Schematic of gas sampling system.15Figure 9Temperature history of inorganic reinforced cement boardat thermocouple in air (7 m).19Figure C.1Location of bricks.31Table C.1Sizes of bricks.32SIST EN 50289-4-11:2002
- 5 -EN 50289-4-11:20021ScopeThis Part 4-11 of EN 50289 specifies a horizontal integrated fire test method for determiningflame-propagation distance, optical smoke density, total heat release, heat release rate, time toignition and flaming droplets/particles for communication cables.The cables are tested in a representative installed condition.2Normative referencesThis standard incorporates by dated or undated reference, provisions from other publications.These normative references are cited at the appropriate places in the text and the citedpublications are listed hereafter. For dated references, subsequent amendments to or revisionsof these publications apply to this European Standard only when incorporated in it byamendment or revision. For undated references, the latest edition of the cited publicationapplies, together with any amendments.EN 60695-4Fire hazard testing - Part 4: Terminology concerning fire tests (IEC 60695-4)3 DefinitionsFor the purposes of this European Standard, the definitions of EN 60695-4 and the followingapply:3.1flame travel distancedistance that the flame travels beyond the extent of the gas burner flame3.2optical density of smoke (OD)smoke obscuration described in terms of logarithmic ratio of initial light intensity toinstantaneous light intensity3.3time-to-ignitionfirst occurrence of initiation of combustion4Test environmentThe fire-test room in which the test chamber and smoke measurement system are located shallhave provision for a free inflow of air to maintain the room at controlled pressure of 0 Pa to12 Pa of water column greater than ambient barometric pressure and at a temperature of 23 °C± 3 °C and relative humidity of 50 % ± 5 % throughout each test run. The fire-test room andsmoke measurement area shall have controllable lighting.5Test apparatusThe fire-test apparatus shall consist of the following:a) air-inlet chamber;b) air-inlet shutter;SIST EN 50289-4-11:2002
EN 50289-4-11:2002- 6 -c) fire-test chamber;d) gas burner;e) removable top cover;f) exhaust transition;g) exhaust duct;h) exhaust duct velocity measurement system;i) smoke measurement system;j) exhaust duct damper;k) exhaust blower;l) heat release rate measurement system.5.1Air-inlet chamberThe fire-test chamber air-inlet transition shall consist of an L-shaped galvanised steel unitsecured to the air-inlet end of the fire-test chamber. The unit shall contain a 300 mm ± 6 mm x464 mm ± 6 mm rectangular opening to allow air to enter the fire-test chamber through thechamber air-inlet shutter. A schematic of the air-inlet chamber is shown in Figure 1.5.2Air-inlet shutterA vertically sliding shutter, extending the entire width of the test chamber, shall be provided atthe air-inlet end of the fire-test chamber. The shutter shall be positioned to provide an air-inletopening of 76 mm ± 2 mm high, measured from the floor level of the test chamber and acrossthe full width of the chamber, as shown in Figure 1 (see also Figure 2).NOTETolerances are contained in applicable subclauses.Figure 1 - Schematic of the air-inlet chamberSIST EN 50289-4-11:2002
- 7 -EN 50289-4-11:20025.3Fire-test chamberThe fire-test chamber shall consist of a horizontal duct of the shapes and sizes shown inFigure 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 provided with arow 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 ± 6,4 mm x 280 mm ± 38 mm). The windows shallbe located so that the gas burner and the length of the specimens being tested, from the pointat 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 withstandingabuse of continuous testing. The ledges shall be level with respect to length and width of thechamber and with respect to each other.To provide air turbulence for combustion, turbulence baffles shall be provided by positioning six229 mm x 114 mm x 64 mm thick refractory fire bricks (long dimension vertical and 114 mmdimension parallel to the wall) along the side walls of the chamber at distances of2,13 m ± 152 mm, 3,66 m ± 152 mm, and 6,10 m ± 152 mm, on the window side (do notobstruct the windows) and 1,37 m ± 152 mm, 2,90 m ± 152 mm, and 4,88 m ± 152 mm on theopposite side, as measured from the center line of the gas burner to the center line of the firebricks.5.4Gas burnerOne end of the test chamber, designated as the air-inlet end in Figure 2, shall be provided witha dual port gas burner, delivering flames upward, to engulf the test specimens. As shown inFigure 3, the burner shall be positioned transversely to each side of the center line of thefurnace so that the flame is evenly distributed over the width of the specimens. The burner shallbe spaced 292 mm ± 6 mm from the air-inlet end of the test chamber, and 191 mm ± 6 mmbelow the removable top cover (see Figure 2 and Figure 3). The burner shall be located1 320 mm ± 51 mm downstream of the air-inlet shutter, as measured from the burner centerline to the outside surface of the shutter. Gas to the burner shall be provided through a singleinlet pipe, distributed to each port burner through a tee-section. The outlet shall be a nominal19 mm elbow. The plane of the ports shall be parallel to the chamber floor, such that the gas isdirected upward toward the specimen. Each port shall be positioned with its center line102 mm ± 6 mm on each side of the center line of the fire-test chamber so that the burnerflame is evenly distributed (see Figure 3). The gas burner should be ignited remotely using anelectronic ignition system. The controls used to maintain a constant flow of methane gas to theburners shall consist of the following:a) a pressure regulator;b) a gas meter calibrated to read in increments of not more than 2,8 l;c) a gauge to indicate gas pressure 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-flowconditions.Alternative control equipment, if shown to be equivalent, shall be permitted.SIST EN 50289-4-11:2002
EN 50289-4-11:2002- 8 -NOTETolerances are contained in applicable subclauses.Figure 2 - Schematic of the fire test chamberSIST EN 50289-4-11:2002
- 9 -EN 50289-4-11:2002NOTETolerances are contained in applicable subclauses.Figure 3 - Cross-section of the fire test chamber (section B-B, Figure 2)5.5Removable top coverThe removable top cover shall consist of a metal and mineral insulation composite unit whoseinsulation consists of nominal 51 mm ± 6 mm thick mineral composition material. The top unit isshown in Figure 3 and shall completely cover the fire-test chamber. The metal and mineralcomposite material shall have physical characteristics as follows:a) maximum effective use temperature of not less than 650 °C;b) bulk density of 335 kg/m3 ± 20 kg/m3 ;c) thermal conductivity of 0,072 W/(m.K) to 0,102 W/(m.K) at 150 °C to 370 °C;d) KpC product of 1 x 104 (W2.s)/(m2.K2) to 4 x 104 (W2.s)/(m2.K2).KpC 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 (nominally1 760 kg/m3 6 mm thick) mineral-fibre/cement board maintained in an unwarped and uncrackedcondition through continued replacement. While in place, the top panel shall rest on a nominal3 mm thick woven fibreglass belting, positioned on the top cover support ledges. The top panelshall be completely sealed against the leakage of air into the fire-test chamber during the test.A water-filled trough, as shown in Figure 3 has been found suitable for this purpose.SIST EN 50289-4-11:2002
EN 50289-4-11:2002- 10 -5.6Exhaust transitionThe exhaust end of the fire-test chamber shall be fitted with a transition piece. The exhausttransition shall consist of a stainless steel unit composed of a 902 mm ± 6 mm long x686 mm ± 6 mm wide x 432 mm ± 6 mm high rectangular section and an 457 mm ± 6 mm longrectangular-to-transition section connected to the 406 mm ± 3 mm inside diameter (I.D) exhaustduct. The outside of the transition section shall be insulated with a nominal 51 mm ceramic fiberblanket (nominal density 130 kg/m3). The shape and size of the exhaust transition are shown inFigure 4.The unit shall be secured to the exhaust end of the fire-test chamber.5.7Exhaust ductThe 406 mm ± 3 mm inside diameter exhaust duct shall be constructed from stainless steel andshall extend 4,9 m to 5,5 m horizontally from the vent end of the transition to the center line ofthe smoke measurement system, to provide for a fully mixed exhaust gas flow. It shall extend aminimum of 8,5 m from the vent end of the exhaust transition section. The exhaust duct shallbe insulated with at least 51 mm of high-temperature mineral composition material from thebeginning of the exhaust transition piece up to and including the smoke measurement system.The high-temperature mineral composition material shall have the same physical characteristicsas the material described in 5.5.5.8Exhaust duct velocity measurement systemThe velocity in the exhaust duct is determined by measuring the differential pressure in the flowpath with a bi-directional probe connected to an electronic pressure gauge, or an equivalentmeasuring system and a thermocouple.The bi-directional probe consists of a stainless steel cylinder with a solid diaphragm in thecenter that divides the probe into two chambers. The probe is 44 mm long with a 22 mm insidediameter. The pressure taps on either side of the diaphragm are to support the probe.The axis of the probe is located at the center line of the duct. The pressure taps are connectedto a pressure transducer having a minimum resolution of 0,25 Pa
of water column.The temperature of the exhaust gas is measured upstream 152 mm from the probe and at thecenter line of the duct, with a 0,32 mm diameter (28 AWG) Type K thermocouple having anInconel sheath.SIST EN 50289-4-11:2002
- 11 -EN 50289-4-11:2002NOTETolerances are contained in applicable subclauses.Figure 4 - Schematic of the exhaust transition5.9Smoke measurement systemA 12-V sealed-beam, clear lens, auto spot lamp shall be mounted on a horizontal section of theexhaust duct (see Figure 5). The lamp shall be located at a point that is preceded by a straightrun of round pipe at least 4,9 m and not greater than 5,5 m, from the vent end of the exhausttransition section. The light beam shall be directed upward along the vertical axis of the exhaustduct. A photoelectric cell having an output directly proportional to the amount of light receivedshall be mounted over the light source, with an overall light-to-cell path distance of910 mm ± 50 mm. The light source and photoelectric cell shall be located such that they areopen to the environment of the test room. The cylindrical light beam shall pass through76 mm ± 3 mm diameter openings at the top and bottom of the 406 mm inside diameter duct,with the resultant light beam centered on the photoelectric cell. The cell shall be connected torecording devices that indicate the attenuation of incident light due to particulate matter, anddue to other effluents, in the passing smoke. Detailed engineering drawings are located inannex C.SIST EN 50289-4-11:2002
EN 50289-4-11:2002- 12 -Figure 5 - Smoke measurement system5.10Smoke release rate measurement systemThe smoke release rate system consists of a smoke measurement system described in 5.9 andthe airflow measurement system described in 5.8.5.11Exhaust duct damperA single blade duct volume control damper, for a 406 mm inside diameter duct, shall bepositioned in the exhaust duct 1,7 m ± 0,2 m, downstream of the smoke measurement system,center line to center line. The relative locations of the exhaust transition piece, exhaust duct,smoke measurement system and exhaust duct damper are shown in Figure 6. To maintainairflow control throughout each test run, the exhaust-duct damper shall be controlled by aclosed-loop feedback system with respect to the air-inlet draft gauge static pressure.5.12Exhaust blowerThe exhaust blower shall have the capacity to develop at least 37 Pa of water column at thedraft gauge tap, with the specimens in place, with the air shutter positioned to provide anair-inlet opening of 76 mm ± 2 mm, and with the exhaust duct damper in the wide-open position(see Figure 6). The exhaust duct connecting the exhaust duct damper to the exhaust blowershall be 406 mm internal diameter and shall be a straight section for a minimum of 1,8 m formthe center line of the exhaust duct damp. Provisions should be provided for an air tightexpansion joint between the exhaust duct damper and exhaust blower.5.13 Fire-test chamber airflow systemAn air intake, fitted with a vertically sliding shutter that extends the entire width of the testchamber, shall be provided at the air-inlet end. The draft plate shall be positioned to provide anair-inlet port, as shown in Figure 1.SIST EN 50289-4-11:2002
- 13 -EN 50289-4-11:2002Movement of air throughout the exhaust duct shall be by induced draft. The draft-inducingsystem shall have a total draft capacity of at least 37 Pa of water column with the specimens inplace, with the shutter at the air-inlet end open to its normal position, and with the exhaustdamper in the wide-open position (see section C-C of Figure 6). A draft-gauge manometer toindicate static pressure shall be inserted through the top at the mid width of the tunnel,25 mm ± 13 mm below the ceiling, and 380 mm ± 13 mm downstream of the air intake shutteras shown in section A-A of Figure 2.5.14Ladder cable trayThe ladder-type cable tray used to support the open-cable test specimens or the cables-in-traytest specimens is shown in Figure 7. The tray shall be fabricated from cold-rolled steel of350 MPa minimum tensile strength. The solid bar stock side rails shall be38 mm ± 3 mm x 10 mm ± 3 mm, as shown in Figure 7. The C-shaped channel rungs shall be13 mm ± 3 mm x 25 mm ± 3 mm x 3 mm ± 1 mm structural channels, as shown in section A-Ain Figure 7. Each rung shall be 286 mm ± 3 mm long. The rungs shall be welded to the siderails 299 mm ± 3 mm on centers along the tray length. The tray shall consist of one or moresections having a total assembled length of 7,3 m ± 51mm and shall be supported with a totalof 16 supports spaced along the length of the tray. The tray supports, as shown in Figure 7,shall be fabricated from bar steel.NOTETolerances are contained in applicable subclauses.Figure 6 - Location of exhaust transition, exhaust duct, smoke measurement systemand damperSIST EN 50289-4-11:2002
EN 50289-4-11:2002- 14 -NOTETolerances are contained in applicable subclauses.Figure 7 - Details of ladder cable tray and supports5.15Fire-test chamber temperature measurement instrumentsA 0,91 mm diameter (19 AWG) chromel-alumel thermocouple with 10 mm ± 3 mm of thejunction exposed in the fire-chamber air, shall be inserted through the floor of the test chamber.The tip of the thermocouple shall be 25 mm ± 3 mm below the top surface of the fibreglassbelting, 7 010 mm ± 13 mm from the center line of the burner, and at the center of the width ofthe chamber.A 0,91 mm diameter (19 AWG) chromel-alumel thermocouple embedded 3,2 mm ± 1,6 mmbelow the floor surface of the test chamber, shall be mounted in refractory or portland cement(carefully dried to keep it from cracking) at distances of 4,0 m ± 13 mm and 7,1 m ± 13 mmfrom the center line of the burner and at the center of the width of the chamber.5.16Data acquisition equipmentA digital data acquisition system shall be used to collect and record light attenuation,temperature, flame spread and velocity measurements. The data system shall be capable ofcollecting the data at intervals of 2 s. The data-acquisition system shall have an accuracycorresponding to at least 1,0 °C for the temperature channels and 0,01 % of full-scaleinstrument output for all other instrument channels. A smoothing routine shall not be used toprocess the data.SIST EN 50289-4-11:2002
- 15 -EN 50289-4-11:20025.17Heat release rate measurement systemThe heat release rate equipment consists of the airflow measurement system described in 5.8,and gas analysis and sampling equipment described herein.The gas analysis and sampling equipment shall consist of the following:a) stainless steel gas sampling tube, located in the exhaust duct to obtain a continuouslyflowing sample, for determining the oxygen concentration of the exhaust gas as a functionof time;b) particulate filters to remove particulate smoke;c) ice bath, drierite, and silica gel to remove moisture from the gas sample;d) ascarite to remove carbon dioxide;e) pump and flow control devices;f) oxygen analyser.The filters and water trap shall be placed in line ahead of the analyser to remove particulate andwater. The oxygen analyser shall be capable of measuring the oxygen concentration in therange from 0 % to 21 % with a full-scale accuracy of ± 0,25 %. The signal from the oxygenanalyser shall be within 10 % of its final value within 30 s
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