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1、BRITISH STANDARD BS EN 50368:2003 Cable cleats for electrical installations The European Standard EN 50368:2003 has the status of a British Standard ICS 29.120.10 ? BS EN 50368:2003 This British Standard, was published under the authority of the Standards Policy and Strategy Committee on 31 October
2、2003 BSI 31 October 2003 ISBN 0 580 42878 8 National foreword This British Standard is the official English language version of EN 50368:2003. The UK participation in its preparation was entrusted to Technical Committee PEL/213, Cable management, which has the responsibility to: A list of organizati
3、ons represented on this committee 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 Catalogue under the section entitled “International Standards Corresponden
4、ce 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 of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itse
5、lf confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and p
6、romulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 24, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since p
7、ublication Amd. No. DateComments EUROPEAN STANDARD EN 50368 NORME EUROPENNE EUROPISCHE NORM October 2003 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassa
8、rt 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 50368:2003 E ICS 29.120.10 English version Cable cleats for electrical installations Brides de cbles pour installations lectriques Kabelhalter fr elektr
9、ische Installationen This European Standard was approved by CENELEC on 2003-09-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists
10、 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 (English, French, German). A version in any other language made by translation under the res
11、ponsibility 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, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, I
12、reland, Italy, Lithuania, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EN 50368:2003 - 2 - Foreword This European Standard was prepared by the Technical Committee CENELEC TC 213, Cable management. The text of the draft was submitted to th
13、e formal vote and was approved by CENELEC as EN 50368 on 2003-09-01. 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 endorsement (dop) 2004-09-01 - latest date by which the national standards
14、 conflicting with the EN have to be withdrawn (dow) 2006-09-01 Annexes designated “informative“ are given for information only. In this standard, Annexes A and B are informative. _ w w w . b z f x w . c o m - 3 - EN 50368:2003 Contents Page 1 Scope.4 2 Normative references .4 3 Definitions 4 4 Gener
15、al requirements.6 5 General notes on tests .6 6 Classification7 7 Marking and documentation9 8 Construction.9 9 Mechanical properties 10 10 Contribution to fire13 11 Environmental influences14 12 Electromagnetic compatibility .14 Figure 1 - Typical arrangement for lateral load test.14 Figure 2 - Uns
16、leeved mandrel.15 Figure 3 - Typical arrangement for impact test 16 Figure 4 - Typical arrangement for short-circuit test17 Figure 5 - Typical arrangement of three cables in trefoil formation 17 Figure 6 - Typical arrangement of cables in side-by-side formation.17 Figure 7 - Typical arrangement for
17、axial movement test18 Figure 8 - Details of mandrel.18 Figure 9 - Typical arrangement of the needle-flame test19 Figure A.1 to Figure A.820 Figure B.1 - Short-circuit current of a far-from-generator short circuit with constant a.c. component .21 Figure B.2 - Short-circuit current of a near-to-genera
18、tor short circuit with decaying a.c. component .22 Figure B.3 - Two parallel conductors.23 Table 1 - Temperature for permanent application8 Table 2 - Flame application time .8 Table 3 - Minimum impact test value.11 Table 4 - Examples of typical peak short-circuit current, initial RMS symmetrical sho
19、rt-circuit current and recommended cables .13 w w w . b z f x w . c o m EN 50368:2003 - 4 - 1 Scope This European Standard specifies requirements and tests for cable cleats used for cable fixing, retention and support in electrical installations up to 1 000 V a.c. and/or 1 500 V d.c. and which, if d
20、eclared, provide resistance to electromechanical forces. This standard does not apply to cable glands, cable ties or devices that rely on the mounting surface for cable retention or devices covered by other standards. Certain cable cleats may be suitable for use in association with cables operating
21、outside the above- mentioned voltages; regard shall then be taken of extra requirements which may be necessary. 2 Normative references This European Standard incorporates, by dated or undated references, provisions from other publications. These normative references are cited at the appropriate plac
22、es 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 European Standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication refe
23、rred to applies (including amendments). Publication Year Title EN 60695-2-2 1994 Fire Hazard testing - Part 2: Test methods - Section 2: Needle-flame test (IEC 60695-2-2:1991) EN 60909-0 2001 Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents (IEC 60909-0:2001) EN I
24、SO 4287 1998 Geometrical product specification (GPS) - Surface texture: Profile method - Terms, definitions and surface texture parameters (ISO 4287:1997) EN ISO 868 1997 Plastics and ebonite - Determination of indentation hardness by means of a durometer (Shore hardness) (ISO 868:1985) IEC 61363-1
25、1998 Electrical installations of ships and mobile fixed offshore units - Part 1: Procedures for calculating short-circuit currents in three phase a.c. 3 Definitions For the purpose of this European Standard, the following definitions apply: 3.1 cable cleat a device designed to provide in itself, or
26、with the system component(s) it is designed to fit to, retention and support of cables and installed at intervals along the length of the cable. A cable cleat is provided with a means of attachment to a mounting surface but does not rely on the mounting surface for the retention of the cables 3.2 in
27、termediate restraint a cable retaining device, which is designed to be used with cable cleats, that is not attached to the support structure and that holds the cables together 3.3 metallic cable cleat a cable cleat consisting of metal only w w w . b z f x w . c o m - 5 - EN 50368:2003 3.4 non-metall
28、ic cable cleat a cable cleat consisting of non-metallic material only 3.5 composite cable cleat a cable cleat comprising metallic and non-metallic materials 3.6 non-flame propagating cable cleat a cable cleat which may or may not ignite as a result of an applied flame but does not propagate fire 3.7
29、 metallic intermediate restraint an intermediate restraint consisting of metal only 3.8 non-metallic intermediate restraint an intermediate restraint consisting of non-metallic material only 3.9 composite intermediate restraint an intermediate restraint comprising metallic and non-metallic materials
30、 3.10 non-flame propagating intermediate restraint an intermediate restraint which may or may not ignite as a result of an applied flame but does not propagate fire 3.11 electrical fault a circuit condition in which the current flows through an abnormal or unintended path. This may result from an in
31、sulation failure or the bridging of insulation. Conventionally, the impedance between live conductors or between live conductors and extraneous conductive parts at the fault position is considered negligible 3.12 fault current a current resulting from an electrical fault 3.13 short-circuit current a
32、n overcurrent resulting from an electrical fault of negligible impedance between live conductors or between a live conductor and an earth, having a difference in potential under normal operating conditions 3.14 peak short-circuit current ip the maximum possible instantaneous value of the short-circu
33、it current (see Annex B) 3.15 initial RMS symmetrical short-circuit current I“k the RMS value of the a.c. symmetrical component of a short-circuit current, applicable at the instant of the short-circuit if the impedance remains at zero-time value (see Annex B) w w w . b z f x w . c o m EN 50368:2003
34、 - 6 - 3.16 decaying (aperiodic) component of short-circuit current id.c. mean value between the top and bottom envelope of a short-circuit current decaying from an initial value to zero (see Annex B) 3.17 steady-state short-circuit current Ik the RMS value of the short circuit current which remains
35、 after the decay of the transient phenomena (see Annex B) 3.18 trefoil formation a symmetrical triangular arrangement of three cables which may be in contact with each other (see Figure 5) 3.19 side-by-side formation an arrangement in which the cables are laid in a flat formation. The cables may be
36、in contact (see Figure 6) 3.20 bundled formation a group of four or more cables held together 3.21 electromechanical forces the induced forces acting on current carrying conductors 3.22 retention the ability of a cable cleat to limit the axial and lateral movement of the cable 3.23 environmental inf
37、luences the effect of corrosive or polluting substances or solar radiation, etc. 4 General requirements 4.1 Cable cleats shall be so designed and constructed that safe handling is ensured and that safe retention and support for the cable(s) is provided. 4.2 Intermediate restraints shall be so design
38、ed and constructed that safe handling is ensured and that a safe means is provided for holding cables together. 5 General notes on tests 5.1 Tests according to this standard are type tests. Where there are a number of sizes in the range, the manufacturer or responsible vendor may define classes (pro
39、ducts of the same declared ability but varying dimensionally) and in this case, only the most critical size in each class shall be tested. 5.2 Unless otherwise specified, all tests shall be carried out on new samples with the cable cleats and intermediate restraints where used, assembled and install
40、ed according to the manufacturers or responsible vendors instructions. Tests on non-metallic and composite cable cleats and intermediate restraints where used shall not commence earlier than 168 hours after manufacture. w w w . b z f x w . c o m - 7 - EN 50368:2003 5.3 Unless otherwise specified, th
41、e tests shall be carried out at an ambient temperature of (25 5) C and a relative humidity between 40 % and 60 %. 5.4 Unless otherwise specified, three samples are subjected to the tests and the requirements are satisfied if all the tests are met. If only one of the samples does not satisfy a test d
42、ue to a manufacturing fault, then that test and any preceding one which may have influenced the results of the test shall be repeated and also the tests which follow shall be made in the same required sequence on another full set of samples, all of which shall comply with the requirements. NOTE The
43、applicant, when submitting the first set of samples, may also submit an additional set of samples which may be necessary should one sample fail. The test house shall then, without further request, test the additional set of samples and shall only reject if a further failure occurs. If the additional
44、 set of samples is not submitted at the same time, a failure of one sample shall entail rejection. 5.5 When toxic or hazardous processes are used, due regard shall be taken of the safety of persons within the test area. 6 Classification 6.1 According to material 6.1.1 Metallic 6.1.2 Non-metallic 6.1
45、.3 Composite 6.2 According to resistance to impact 6.2.1 Very light 6.2.2 Light 6.2.3 Medium 6.2.4 Heavy 6.2.5 Very heavy 6.3 According to resistance to electromechanical forces 6.3.1 Non-resistant to electromechanical forces 6.3.2 Resistant to electromechanical forces The manufacturer or responsibl
46、e vendor shall declare the category of the cable cleat as follows: 6.3.2.1 capable of withstanding one short-circuit 6.3.2.2 capable of withstanding two short-circuits without any adjustment of the cleats and/or intermediate restraints between short-circuits w w w . b z f x w . c o m EN 50368:2003 -
47、 8 - The manufacturer or responsible vendor shall also declare the peak short-circuit current and the initial RMS symmetrical short-circuit current, the arrangement showing the maximum spacing between cleats and intermediate restraints, where used. 6.4 According to temperature Table 1 - Temperature
48、for permanent application A. Maximum temperature C +40 +60 +85 +105 +120 +150 +250 B. Minimum temperature C -5 -15 -25 -40 -60 NOTE For temperature values above 250 C and below -60 C, the manufacturer or responsible vendor may declare temperatures outside the values tabulated above. 6.5 According to
49、 flame application time This is given in Table 2 for non-metallic and composite cable cleats and non-metallic and composite intermediate restraints. Table 2 - Flame application time Application time s 5 10 20 30 60 120 6.6 According to response to environmental influences Under consideration. w w w . b z f x w . c o m - 9 - EN 50368:2003 7 Marking and documentation 7.1 Marking Each cable cleat and intermediate restraint shall be marked with the manufacturers or responsible