EN 20284:1993

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Fördergurte - Elektrische Leitfähigkeit - Spezifikation und Prüfverfahren (ISO 284:1982)Courroies transporteuses - Conductibilité électrique - Spécification et méthode d'essai (ISO 284:1982)Conveyor belts - Electrical conductivity - Specification and method of test (ISO 284:1982)53.040.20Deli za transporterjeComponents for conveyorsICS:Ta slovenski standard je istoveten z:EN 20284:1993SIST EN 20284:1997en01-marec-1997SIST EN 20284:1997SLOVENSKI
STANDARD



SIST EN 20284:1997



SIST EN 20284:1997



SIST EN 20284:1997



International Standard 284 INTERNATIONAL ORGANIZATION FOR STANDARDlZATIONWlE~YHAPO~HAR OPrAHM3AUMR l-lo CTAH~PTH3A~lM.ORGANlSATlON INTERNATIONALE DE NORMALISATION Conveyor belts - Electrical conductivity - Specification and method of test Courroies transporteuses - Conductibifit6 hlectrique - Spkifica tion et m&bode d’essai Second edition - 198245~01 UDC 621867.21 : 621.317331 Ref. No. IS0 2844982 (E) Descriptors : belts, conveyor belts, tests, electrical tests, resistivity, specifications. Price based on 3 pages SIST EN 20284:1997



Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards institutes (IS0 member bodies). The work of developing lnter- national Standards is carried out through IS0 technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. International Standard IS0 284 was developed by Technical Committee ISO/TC 41, Pulleys and belts (including veebeltsl. This second edition was submitted directly to the IS0 Council, in accordance with clause 5.10.1 of part 1 of the Directives for the technical work of ISO. It cancels and replaces the first edition (i.e. IS0 284-19751, which had been approved by the member bodies of the following countries : Australia Austria Belgium Brazil Chile Colombia Czechoslovakia Denmark France Germany, F. R. Greece India Iran Israel Italy Mexico New Zealand Portugal South Africa, Rep. of Spain Sweden Turkey United Kingdom USA USSR Yugoslavia No member body had expressed disapproval of the document. 0 International Organization for Standardization, 1982 Printed in Switzerland SIST EN 20284:1997



INTERNATIONAL STANDARD IS0 284-1982 (E) Conveyor belts - Electrical conductivity - Specification and method of test 1 Scope and field of application This International Standard specifies the maximum electrical resistance of a conveyor belt and the corresponding method of measurement. The test is intended to ensure that the belt is sufficiently con- ductive to drain off charges of electricity which may form on it in service. 2 Reference IS0 471, Rubber - Standard temperatures, humidities and times for the conditioning and testing of test pieces. 3 Specification The electrical resistance shall not exceed 3 x 108 Q (300 MQ). 4.2.4 Source of direct current, of voltage between 40 and 1000 V, and not causing an energy dissipation of more than 1 W in the test piece. 4.3 Test pieces 4.3.1 Shape and dimensions The test piece shall be square and shall be cut from the com- plete thickness of the belt, including covers. Length of side : 300 mm minimum. Thickness : the thickness of the belt. 4.3.2 Number Two test pieces shall be used. 4.3.3 Preparation The preparation of the test piece consists in the following : 4 Method of test 4.1 Principle An electrical current of specified voltage is passed via elec- trodes through a suitably prepared test piece taken from the belt. 4.2 Apparatus The apparatus shall consist of the following items : 4.2.1 Sheet of inkulating material, a little larger than the test piece. 4.2.2 Two cylindrical and coaxial brass electrodes, the base of one being circular and the other annular. The dimen- sions and masses
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