BS-EN-50396-2005.pdf
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1、BRITISH STANDARD BS EN 50396:2005 Non electrical test methods for low voltage energy cables The European Standard EN 50396:2005 has the status of a British Standard ICS 29.060.20 ? BS EN 50396:2005 ISBN 0 580 46736 8 National foreword This British Standard is the official English language version of
2、 EN 50396:2005. It supersedes BS 6469-98.1:1996 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee GEL/20, Electric cables, to Subcommittee GEL/20/17, Low voltage cables, which has the responsibility to: aid enquirers to understand the text; present to t
3、he responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtaine
4、d 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 Correspondence Index”, or by using the “Search” facility of
5、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 itself confer immunity from legal obligations. Summa
6、ry of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 45 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments This British Standar
7、d was published under the authority of the Standards Policy and Strategy Committee on 14 November 2005 BSI 14 November 2005 EUROPEAN STANDARD EN 50396 NORME EUROPENNE EUROPISCHE NORM August 2005 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotec
8、hnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50396:2005 E ICS 29.060.20 Partially supersedes HD 21.2 S3:199
9、7 + A1:2002 it is intended that they should be specified by the standard dealing with the relevant type of cable. Any test requirements which are given in this standard may be modified by the relevant cable standard to suit the needs of a particular type of cable. 4 General test methods for dimensio
10、ns 4.1 Measurement of insulation thickness 4.1.1 Procedure The thickness of insulation shall be measured in accordance with 8.1 of EN 60811-1-1. Three samples shall be taken from the cable; each sample shall be separated from the next by a distance of at least 1 m. Conformity shall be checked on eac
11、h core. 7 EN 50396:2005 If withdrawal of the conductor is difficult, it shall be stretched in a tensile testing machine or the piece of core shall be loosened by stretching or some other suitable means that does not damage the insulation. The cores of flat non-sheathed cords shall not be separated.
12、4.1.2 Evaluation of results The mean of the 18 values (expressed in millimetres) obtained from the three pieces of insulation from each core shall be calculated to two decimal places and rounded off as given in Annex B, and this shall be taken as the mean value of the thickness of insulation. The lo
13、west of all values obtained shall be taken as the minimum thickness of insulation at any place. 4.2 Measurement of sheath thickness for circular cables 4.2.1 Procedure The thickness of the sheath for circular cables shall be measured in accordance with 8.2 of EN 60811-1-1. One sample of cable shall
14、be taken from each of three places, separated by at least 1 m. For flat cords the measurements shall be carried out in accordance with 4.3. 4.2.2 Evaluation of results The mean of all the values (expressed in millimetres) obtained from the three pieces of sheath shall be calculated to two decimal pl
15、aces and rounded off as given in Annex B, and this shall be taken as the mean value of the thickness of sheath. The lowest of all values obtained shall be taken as the minimum thickness of sheath at any place. 4.3 Measurement of sheath thickness for flat cables 4.3.1 Measuring equipment A measuring
16、microscope or a profile projector shall be used, each instrument being capable of at least 10 x magnification. The equipment shall have an accuracy of 0,01 mm. In cases of dispute a microscope allowing a reading with an accuracy of 0,01 mm or a profile projector of at least 20 x magnification shall
17、be used. 4.3.2 Preparation of test pieces One sample of cable shall be taken from each of three places, separated by at least 1 m. After all materials inside the sheath have been removed, a test piece shall be prepared from each sample by cutting with a suitable device (sharp knife, razor blade, etc
18、.) a slice of sheath along a plane perpendicular to the longitudinal axis of the cable. If the sheath carries an indented marking, the test piece shall be taken so as to include such marking. 4.3.3 Measuring procedure The test piece shall be placed under the measuring equipment with the plane of the
19、 cut perpendicular to the optical axis. Measurements shall be taken on lines approximately parallel to the minor axis and on the major axis of the cross section, at the position of each core, as shown in Figure 1. EN 50396:2005 - 8 - The thinnest place on the sheath shall be measured. Where this doe
20、s not coincide with one of the designated measurement points shown in Figure 1, it shall be substituted for the closest such point, to give a total of six measurements. The measurements shall be made in millimetres to two decimal places. 4.3.4 Evaluation of results The mean of all the values (expres
21、sed in millimetres) obtained from the three pieces of sheath shall be calculated to two decimal places and rounded off as given in Annex B, and this shall be taken as the mean value of the thickness of sheath. The lowest of all values obtained shall be taken as the minimum thickness of sheath at any
22、 place. 1 Key 1 minimum thickness Figure 1 - Measurement of sheath thickness (flat cable) 4.4 Measurement of overall dimensions and ovality 4.4.1 Overall dimensions 4.4.1.1 Procedure The measurement of the overall diameter of any circular cable and of the overall dimensions of flat cables with a maj
23、or dimension not exceeding 15 mm shall be carried out in accordance with 8.3 of EN 60811-1-1. The three samples taken in accordance with 4.1.1, 4.2.1 or 4.3.2 shall be used. For the measurement of flat cables with a major dimension exceeding 15 mm, a micrometer, a profile projector or similar equipm
24、ent shall be used. 4.4.1.2 Evaluation of results The mean of the values obtained shall be taken as the mean overall dimensions. 9 EN 50396:2005 4.4.2 Procedure for ovality measurement For checking the ovality of circular sheathed cables, two measurements shall be made at the same cross-section of th
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