Overview
IEC 60811-513:2012 is an international standard developed by the International Electrotechnical Commission (IEC) that specifies test methods for electric and optical fibre cables, focusing on non-metallic insulation materials. This part, titled "Mechanical tests - Methods specific to polyethylene and polypropylene compounds - Wrapping test after conditioning," outlines the procedures for assessing mechanical properties of polyethylene and polypropylene insulation after thermal conditioning. It is specifically applicable to filled cables using polyolefin insulation with a wall thickness less than or equal to 0.8 mm.
The standard aims to ensure reliability and durability by testing the mechanical resilience of cable insulation under elevated temperatures, simulating real-world thermal stresses, and providing consistent quality benchmarks for manufacturers and end-users.
Key Topics
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Scope and Application
IEC 60811-513:2012 applies to polyethylene and polypropylene insulation in electric and optical fibre cables, particularly for samples taken from filled cables. It covers a wrapping test conducted after conditioning the samples at elevated temperatures to evaluate their mechanical integrity.
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Conditioning Procedure
Cable samples are conditioned in air at specified temperatures (60°C or 70°C ± 2°C) for 7 days, depending on the nominal drop point of the filling compound. Post-conditioning, samples rest at ambient temperature for at least 16 hours before testing.
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Wrapping Test Method
After conditioning, the test involves imposing a tensile load on the conductor and wrapping the insulated sample around a metal mandrel. The wrapping diameter ranges between 1 to 1.5 times the diameter of the test piece. The wrapped sample is then exposed to elevated temperature (70 ± 2°C) for 24 hours to assess resistance to mechanical deformation and cracking.
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Evaluation Criteria
After testing and cooling, samples are examined visually for cracks or damage without magnification. The test may be repeated if initial failure occurs, ensuring reliable mechanical performance data.
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Compatibility
This standard is intended to be read and applied in conjunction with IEC 60811-100:2012, which provides general test methods for non-metallic materials in cables.
Practical Applications
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Quality Control in Cable Manufacturing
Producers of electric and optical fibre cables utilize IEC 60811-513:2012 to verify the mechanical durability of polyethylene and polypropylene insulation materials after thermal aging. This ensures product reliability under operational temperature conditions.
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Material Selection and Development
Material scientists and engineers use the wrapping test results to optimize polyolefin compounds for improved mechanical properties, enhancing cable longevity and safety.
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Compliance and Certification
Meeting this standard facilitates compliance with international regulations for cable manufacturing, enabling access to global markets requiring standardized testing methods for insulation materials.
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Cable Design for Harsh Environments
The test simulates thermal stresses similar to those encountered in harsh installation environments, aiding in the design of cables suitable for energy distribution, telecommunications, offshore, and shipboard applications.
Related Standards
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IEC 60811 Series
The IEC 60811 family covers comprehensive test methods for non-metallic materials in cables. Part 100 provides general guidance, while other parts address specific materials and tests.
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IEC 60811-100:2012
General test methods for non-metallic materials in cables, which IEC 60811-513:2012 references and complements.
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IEC 60811-4-2:2004 (Withdrawn)
The previous version of the wrapping test method replaced by IEC 60811-513:2012, with no significant technical changes.
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IEC 60811-601
Defines the measurement of the drop point of filling compounds, relevant to conditioning parameters in IEC 60811-513:2012.
Keywords
IEC 60811-513, wrapping test, polyethylene insulation, polypropylene insulation, cable testing, non-metallic materials, mechanical tests, cable conditioning, polyolefin insulation, electric cables, optical fibre cables, thermal aging test, cable insulation durability, IEC standards, cable quality control.
Open preview (PDF)Electric and optical fibre cables - Test methods for non-metallic materials - Part 513: Mechanical tests - Methods specific to polyethylene and polypropylene compounds - Wrapping test after conditioning
