Common test methods for insulating and sheathing materials of electric and optical cables - Part 11：Methods for general application - Measurement of thickness and overall dimensions
1 Scope
GB/T 2951 specifies the test methods to be used for testing polymeric insulating and sheathing materials of electric cables and optical cables for power distribution and telecommunications including cables used on ships, and in offshore applications.
This part of GB/T 2951 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 document contains provisions which, through reference in this text, constitute provisions of this part of GB/T 2951. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 2951.12-2008 Common Test Methods for Insulating and Sheathing Materials of Electric Cables and Optical Cables — Part 12: Methods for General Application — Thermal Ageing Methods (IEC 60811-1-2:1985, IDT)
GB/T 2951.13-2008 Common Test Methods for Insulating and Sheathing Materials of Electric Cables and Optical Cables — Part 13: Methods for General Application — Measurement for Determining the Density — Water Absorption Tests — Shrinkage Test (IEC 60811-1-3:1993, IDT)
GB/T 2951.21-2008 Common Test Methods for Insulating and Sheathing Materials of Electric Cables and Optical Cables — Part 21: Methods Specific to Elastomeric Compounds — Ozone Resistance, Hot Set and Mineral Oil Immersion Tests (IEC 60811-2-1:1998, IDT)
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 part may be modified by the relevant cable standard to suit the needs of a particular type of cable.
Foreword II
1 Scope
1.1 Normative References
2 Test Values
3 Applicability
4 Type Tests and Other Tests
5 Pre-conditioning
6 Test Temperature
7 Definitions
8 Measurement of Thicknesses and Overall Dimensions
8.1 Measurement of Insulation Thickness
8.2 Measurement of Thickness of Non-metallic Sheath
8.3 Measurement of Overall Dimensions
9 Tests for Determining the Mechanical Properties of Insulating and Sheathing Compounds
9.1 Insulating Compounds
9.2 Sheathing Compounds
Annex A (Informative) Principle of Operation of a Typical Machine for Preparing Test Pieces
