λευκή σοκολάτα, μπισκότο, καφές

λευκή σοκολάτα, μπισκότο, καφές

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17.6 Measurement of thickness of lead sheath17.6.1 GeneralThe minimum thickness of the lead sheath shall be determined by one of the following methods, at the discretion of the manufacturer, and shall not fall below 95 % of the nominal thickness by more than 0,1 mm i.e.:tmin 2 0,95 th -0,1NOTE Methods of measuring thickness of other types of metal sheath are under consideration.17.6.2 Strip methodThe measurement shall be made with a micrometer with plane faces of 4 mm to 8 mmdiameter and an accuracy of t0,01 mm.The measurement shall be made on a test piece of sheath about 50 mm in length removed from the completed cable. The piece shall be slit longitudinally and carefully flattened. After cleaning the test piece, a sufficient number of measurements shall be made along the circumference of the sheath and not less than 10 mm away from the edge of the flattened piece to ensure that the minimum thickness is measured.17.6.3 Ring methodThe measurements shall be made with a micrometer having either one flat nose and one ball nose, or one flat nose and a flat rectangular nose 0,8 mm wide and 2,4 mm long. The ball nose or the flat rectangular nose shall be applied to the inside of the ring. The accuracy of the micrometer shall be t0,01 mm.The measurements shall be made on a ring of the sheath carefully cut from the sample. The thickness shall be determined at a sufficient number of points around the circumference of the ring to ensure that the minimum thickness is measured.17.7 Measurement of armour wires and tapes17.7.1 Measurement on wiresThe diameter of round wires and the thickness of flat wires shall be measured by means of a meter having two flat noses to a accuracy of t0,01 mm. For round wires, surements shall be made at right angles to each other at the same position average of the two values taken as the diameter.17.7.2 Measurement on tapesThe measurement shall be made with a micrometer having two flat noses of approximately 5 mm in diameter to an accuracy of t 0,01 mm. For tapes up to 40 mm in width the thickness e measured at the centre of the width. For wider tapes the measurements s 20 mm from each edge of the tape and the average of the results taken as the thickness.17.7.3 RequirementsThe dimensions of armour wires and tapes shall not fall below the nominal values given in 13.5 by more than:5 % for round wires;8 % for flat wires;10 % for tapes.17.8 Measurement of external diameterbe carried out in accordance with IEC 60811-203. measurement of the external diameter of the cable is required as a sample17.9 Voltage test for 4 hThis test is applicable only to cables of rated voltage above 3,6/6 (7,2) KV.17.9.1 Samplingsample shall be a piece of completed cable at least 5 m in length betwe terminations.17.9.2 ProcedureA power frequency voltage shall be applied for 4 h at ambient temperature between each conductor and the metal layer(s).17.9.3 Test voltagesThe test voltage shall be 4 Uo. Values of the test voltage for the standard rated voltages are given in Table 13.Table 13 - Sample test voltages