IEC 60811-2-1 pdf download

IEC 60811-2-1 pdf download.Common test methods for insulating and sheathing materials of electric and optical cables
1 General
1.1 Scope This standard specifies the test methods to be used for testing polymeric insulating and sheathing materials of electric and optical cables for power distribution and telecommuni- cations, including cables used on ships and in offshore applications. This standard gives the methods for the ozone resistance test, hot set test and mineral oil immersion test, which apply to elastomeric compounds. 1.2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 6081 1 . At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 6081 1 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 6081 1 -1 -1 :1 993, Common test methods for insulating and sheathing materials of electric cables – Part 1: Methods for general application – Section 1: Measurement of thickness and overall dimensions – Tests for determining the mechanical properties IEC 6081 1 -1 -2:1 985, Common test methods for insulating and sheathing materials of electric cables – Part 1: Methods for general application – Section Two: Thermal ageing methods ISO 1 81 7:1 999, Rubber, vulcanized – Determination of the effect of liquids
8 Ozone resistance test
Warning: Attention is drawn to the toxicity of ozone. Precautions should be taken to minimize exposure of personnel to it at all times and the concentration in the workroom environment should not be allowed to exceed 0,1 ppm (parts ozone per million parts air by volume), or the value in the current industrial hygienic standard, whichever is the lower. 8.1 Test method 8.1 .1 Test apparatus a) A device for generating a controlled amount of ozone. b) A means for circulating ozonized air under controlled conditions of humidity and tempera- ture through a chamber containing the test pieces to be tested. c) A means for determination of ozone concentration. d) A suitable device for the clamping and elongation of test pieces. e) Cylindrical mandrels consisting of wood or metal. f) A desiccator filled with silica gel or equivalent material. g) An accurate laboratory balance reading to 0,1 mg.8.1.2 Sampling 8.1.2.1 Sampling of insulation Whether the cable is single or multicore, only one core needs to be tested. Sufficient length of core shall be cut from a position not less than 1 ,5 m from the end of the length of cable to provide two test pieces, unless the core has an extruded semi-conductor layer on the outside, in which case sufficient length for four test pieces shall be taken. Any sample that shows signs of mechanical damage shall not be used for the tests. 8.1.2.2 Sampling of sheath One sample of the cable or cord to be tested, or of the sheath removed from the cable, shall be taken of sufficient size to provide a minimum of two test pieces. Any sample that shows signs of mechanical damage shall not be used for the tests. 8.1 .3 Preparation of test pieces 8.1 .3.1 Test pieces of insulation Any protective coverings present on the core shall be removed without damaging the insulation, unless they were applied directly to the insulation prior to vulcanization and are adherent to it. If the core has a semi-conducting layer in the form of tape on the outside, this shall be removed. If the core has an extruded semi-conducting screen on the outside, this shall be removed from two test pieces and left in position on the other two.