IEC 60811-1-1 pdf download.Common test methods for insulating and sheathing materials of electric cables and optical cables
The International Standard IEC 6081 1 -1 specifies the test methods to be used for testing polymeric insulating and sheathing materials of electric cables for power distribution and telecommunications including cables used on ships, and in offshore applications. This section of IEC 6081 1 -1 gives the methods for measuring thicknesses and overall dimensions, and for determining the mechanical properties, which apply to the most common types of insulating and sheathing compounds (elastomeric, PVC, PE, PP, etc.).
1.1 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 6081 1 -1 . For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of IEC 6081 1 -1 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IEC and ISO maintain registers of currently valid International Standards. 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 IEC 6081 1 -1 -3:1 985, Common test methods for insulating and sheathing materials of electric cables – Part 1: Methods for general application – Section Three: Methods for determining the density – Water absorption tests – Shrinkage test IEC 6081 1 -2-1 :1 986, Common test methods for insulating and sheathing materials of electric cables – Part 2: Methods specific to elastomeric compounds – Section 1: Ozone resistance test – Hot set test – Mineral oil immersion test
2 Test values
Full test conditions (such as temperatures, durations, etc.) and full test requirements are not specified in this standard; 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 section may be modified by the relevant cable standard to suit the needs of a particular type of cable.
8 Measurement of thicknesses and overall dimensions
8.1 Measurement of insulation thickness 8.1.1 General Measurement of insulation thickness may be required as an individual test, or as a step in the procedure for carrying out other tests, such as the determination of mechanical properties. In each case, the methods of selection of samples shall be in accordance with the relevant cable standard. 8.1.2 Measuring equipment A measuring microscope or a profile projector of at least 1 0 x magnification. Both types of equipment shall allow a reading of 0,01 mm and an estimated reading to three decimal places when measuring insulation with a specified thickness less than 0,5 mm. In case of doubt, the measuring microscope shall be taken as the reference method. 8.1 .3 Preparation of test pieces Any covering shall be removed from the insulation, and the conductor(s), together with separator (if any) shall be withdrawn, care being taken to avoid damage to the insulation. Semi-conducting inner and/or outer layers, if bonded to the insulation, shall not be removed. Each test piece shall consist of a thin slice of insulation. The slice shall be cut with a suitable device (sharp knife, razor blade, etc.) along a plane perpendicular to the longitudinal axis of the conductor. The cores of non-sheathed flat cords shall not be separated. If the insulation carries an indented marking, thus giving rise to a local reduction in thickness, the test piece shall be taken so as to include such marking.