1、BRITISH STANDARD BS EN 50362:2003 Method of test for resistance to fire of larger unprotected power and control cables for use in emergency circuits The European Standard EN 50362:2003 has the status of a British Standard ICS 13.220.40; 29.060.20 BS EN 50362:2003 This British Standard was published
2、under the authority of the Standards Policy and Strategy Committee on 3 April 2003 BSI 3 April 2003 ISBN 0 580 41529 5 National foreword This British Standard is the official English language version of EN 50362:2003. The UK participation in its preparation was entrusted by Technical Committee GEL/2
3、0, Electric cables, to Subcommittee GEL/20/18, Fire testing, which has the responsibility to: 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 t
4、o in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions
5、of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or pr
6、oposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 21 and a back cover. The BSI copyright date disp
7、layed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 50362 NORME EUROPENNE EUROPISCHE NORM February 2003 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electr
8、otechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50362:2003 E ICS 13.220.40; 29.060.20 English version Meth
9、od of test for resistance to fire of larger unprotected power and control cables for use in emergency circuits Mthode dessai de rsistance au feu des cbles de contrle et dnergie de grande dimension non protgs pour utilisation dans les circuits de secours Prfung des Isolationserhaltes im Brandfall von
10、 Kabeln und Leitungen mit groen Durchmessern fr die Verwendung in Notstromkreisen bei ungeschtzter Verlegung This European Standard was approved by CENELEC on 2002-12-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Euro
11、pean Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical 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 (Eng
12、lish, French, German). A version in any other language made by translation under the responsibility of a 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 electrotechnical committees of Austria,
13、 Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EN 50362:2003 2 Foreword This European Standard was prepared by the Technical Committee CE
14、NELEC TC 20, Electric cables. The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50362 on 2002-12-01. The following dates were fixed: - latest date by which the EN has to be implemented at national level by publication of an identical national standard or by end
15、orsement (dop) 2003-12-01 - latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2005-12-01 _ 3 EN 50362:2003 Contents Page 1 Scope4 2 Normative references4 3 Definitions4 4 Duration of survival.4 4.1 Time4 4.2 Point of failure.4 5 Test environment.5 6 Test
16、apparatus.5 6.1 Test equipment.5 6.2 The test ladder and its mounting 5 6.3 Continuity checking and voltage withstand arrangement .6 6.4 Source of heat.6 6.5 Shock producing device7 7 Verification procedure for the source of heat 7 8 Test sample7 8.1 Sample preparation.8 8.2 Sample mounting8 9 Cable
17、 test procedure.8 9.1 General.8 9.2 Electrical test procedure .8 9.3 Ignition and shock production.9 9.4 Test voltage application9 9.5 End point.9 10 Retest procedure.9 11 Test report10 Bibliography21 EN 50362:2003 4 1 Scope This European Standard specifies a test method for cables designed to have
18、intrinsic resistance to fire and intended for use as emergency circuits. The standard is applicable to power and control cables for emergency circuits of rated voltage not exceeding 0,6 /1 kV. The test method is intended for cables with an overall diameter exceeding 20 mm. Cables of smaller diameter
19、 shall be tested in accordance with EN 50200. The test method is based on the direct impingement on the cable of the flame from a propane burner giving a constant temperature attack of a notional 842 C and under the influence of mechanical impact. 2 Normative references This European Standard incorp
20、orates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this Europ
21、ean Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 50200 Method of test for resistance to fire of unprotected small cables for use in emergency circuits EN 60269-3 Low voltage
22、 fuses Part 3: Supplementary requirements for fuses for use by unskilled persons (fuses mainly for domestic and similar applications) EN 60584-1 Thermocouples Part 1: Reference tables EN 60695-4 Fire hazard testing Part 4: Terminology concerning fire tests 3 Definitions For the purposes of this stan
23、dard, the definitions given in EN 60695-4 apply. 4 Duration of survival 4.1 Time The duration of survival, measured in minutes, to the point of failure shall be recorded for each cable tested up to a maximum survival time of 120 min, or the required survival time given in the particular cable standa
24、rd. 4.2 Point of failure The criteria for determining the point of failure shall be as follows: the voltage is not maintained during the test duration, as indicated by fuse failure or by interruption of the circuit breaker; a conductor ruptures during the test duration, as indicated by the lamp exti
25、nguishing. 5 EN 50362:2003 Failure by either one of the criteria listed shall be sufficient to show failure for that cable. 5 Test environment The test shall be carried out in a suitable chamber with facilities for disposing of any noxious gases resulting from the burning. Sufficient ventilation sha
26、ll be available to sustain the flame for the duration of the test. The chamber and test apparatus shall be in the range 10 C to 40 C at the start of each test. The same ventilation and shielding conditions shall be used in the chamber during both the verification and cable test procedures. NOTE 1 Th
27、e test given in this standard involves the use of dangerous voltages and temperatures. Suitable precautions should be taken against shock, burning, fire and explosion risks that may be involved and against any noxious fumes that may be produced. NOTE 2 An example of a suitable chamber is the 3 m smo
28、ke cube as specified in EN 50268-1. NOTE 3 Shields, such as those described in EN 50268-1, may need to be placed in an appropriate position to protect the burner from draughts that may influence the flame geometry. 6 Test apparatus 6.1 Test equipment The test equipment consists of the following: a)
29、a test ladder on to which the cable is mounted, comprising steel framework fastened to a rigid support as described in 6.2; b) a continuity checking and voltage withstand arrangement as described in 6.3; c) a source of heat comprising a horizontally mounted ribbon burner as described in 6.4; d) a sh
30、ock producing device as described in 6.5; e) a test wall equipped with thermocouples for verification of the source of heat as described in Clause 7. A general arrangement of the test equipment is shown in Figures 1, 2 and 3. 6.2 The test ladder and its mounting The test ladder consists of a steel f
31、ramework as shown in Figure 1. The two central vertical elements of the ladder are adjustable in order to accommodate different sizes of cable under test. The test ladder is approximately 1 200 mm long and 600 mm high, and the total mass of the test ladder shall be (18 1) kg. Ballast, if required, s
32、hall be placed on the steel supports. Each horizontal element shall have a mounting hole not more than 200 mm from each end, the exact position and diameter being determined by the particular supporting bush and supporting framework used. The test ladder shall be fastened to a rigid support by four
33、bonded rubber bushes of hardness 50 to 60 Shore A fitted between the horizontal steel elements of the ladder and the support framework, as shown in Figures 1 and 2 so as to allow movement under impact. EN 50362:2003 6 NOTE 1 Angle iron approximately 45 mm wide and 6 mm thick, with suitable slots cut
34、 to allow for movement of vertical elements and fixing of the bolts and clips, has been found to be a suitable material for construction of the ladder. NOTE 2 A typical rubber bush which has been found to be suitable is shown in Figure 4. 6.3 Continuity checking and voltage withstand arrangement Dur
35、ing the test a current for continuity checking is passed through all conductors of the cable and this shall be provided by a three phase star-connected or single phase transformer(s) of sufficient capacity to maintain the test voltage up to the maximum leakage current allowable. NOTE 1 Due note shou
36、ld be taken of the fuse characteristics when determining the power rating of the transformer. This current is achieved by connecting, at the other end of the sample, a suitable load and indicating device (e.g. lamp) to each conductor, or group of conductors. NOTE 2 A current of 0,25 A at the test vo
37、ltage, through each conductor or group of conductors, has been found to be suitable. 6.4 Source of heat The source of heat shall be a ribbon type propane gas burner with a nominal burner face length of 500 mm with Venturi mixer. A centre feed burner is recommended. The nominal burner face width shal
38、l be 10 mm. The face of the burner shall have three staggered rows of drilled holes nominally 1,32 mm in diameter and drilled at centres 3,2 mm from one another, as shown in Figure 5. Additionally, a row of small holes milled on each side of the burner plate, to serve as pilot holes for keeping the
39、flame burning, is permitted. Guidance on the choice of recommended burner systems is given in EN 50200, Annex A. Mass flow meters shall be used as the means of controlling accurately the input flow rates of fuel and air to the burner. NOTE 1 Rotameter type flow meters may be used as an alternative,
40、but are not recommended. Guidance on their use, and the application of appropriate correction factors, may be found in EN 50200. Figure 6 shows an example of a rotameter type system. By reference to the centre point of the cable to be tested, the burner shall be positioned centrally at a horizontal
41、distance of (H 2) mm from the burner face to the centre of the cable and at a vertical distance of (V 2) mm from the burner centre line to the centre of the cable, as shown in Figure 3. The burner shall be positioned in the test chamber such that it is at least 200 mm above the floor of the chamber
42、or any solid mounting table and 500 mm from any chamber wall. The flow rates used for the test at reference conditions (1 bar and 20 C) shall be as follows: propane: (10,0 0,4) litres/min; air: (160 8) litres/min. The burner and control system of this test shall be subject to verification following
43、the procedure given in Clause 7. The exact burner position to be used during cable testing shall be determined during the verification procedure, where the values of V and H to be used shall be determined. For the purposes of this test, the air shall have a dew point not higher than 0 C. NOTE 2 The
44、burner should be rigidly fixed during the test so as to prevent movement relative to the test sample. 7 EN 50362:2003 6.5 Shock producing device The shock producing device consists of a mild steel round bar (25 0,1) mm in diameter and (600 5) mm long. The bar is freely pivoted about an axis parallel
45、 to the test ladder, which is in the same horizontal plane as, and (200 5) mm away from, the upper edge of the test ladder. The axis divides the bar into two unequal sections of length, (400 5) mm and approximately 200 mm respectively, the longer section impacting the ladder. The bar drops under its
46、 own weight from an angle of 60 to the horizontal to strike the test ladder at its midpoint as shown in Figure 1 and Figure 3. 7 Verification procedure for the source of heat 7.1 The flame temperature shall be measured using two 1,5 mm mineral insulated, stainless steel sheathed thermocouples Type K
47、 to EN 60584-1, mounted on a test wall as shown in Figure 8. The thermocouple tips shall be (20 1,0) mm in front of the test wall. The horizontal line of the thermocouples shall be approximately 100 mm above the bottom of the wall. NOTE Details of the test wall may be found in 6.2 of EN 50200. Posit
48、ion the burner in the range 100 mm to 120 mm horizontally from the thermocouples and in the range 40 mm to 60 mm vertically below the centre line of the thermocouples as shown in Figure 8. Ignite the burner and adjust the gas and air supplies to those given in 6.4. 7.2 Monitor the temperature as rec
49、orded by the thermocouples over a period of 10 min to ensure conditions are stable. 7.3 The verification procedure shall be considered satisfied if the average of the two thermocouple readings over the 10 min falls within the requirement of C ) 830 ( 40 0 +and the maximum difference of the average individual thermocouple readings does not exceed 40 C. At least one measurement shall be made every 30 s in order to obtain
