BS EN 60811-509: Heat Shock Test for Cables
Purpose: The Heat Shock Test evaluates the
resistance of cable insulation and sheath materials to cracking when subjected to elevated temperatures and mechanical stress.
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Test Procedure: - Samples are tightly wound around mandrels to form a close helix.
- Placed in an air oven at a specified temperature (150°C ± 3°C) for 1 hour.
- Samples are cooled and visually inspected for cracks.
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Mandrel Diameter and Turns: For cores with overall diameter
≤ 12.5 mm: | External Diameter (mm) | Mandrel Diameter (mm) | Number of Turns |
| Up to 2.5 | 5 | 6 |
| 2.5 to 4.5 | 9 | 6 |
| 4.5 to 6.5 | 13 | 6 |
| 6.5 to 9.5 | 19 | 4 |
| 9.5 to 12.5 | 40 | 2 |
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Pass/Fail Criteria: - No cracks through the
entire material thickness.
- Cracks at fixing points on mandrels are
not considered failures.
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Applications: - Power Systems: Ensures reliability for low-voltage and flexible cables.
- Industrial Use: Cables exposed to machinery heat.
- Telecommunications: Optical fiber cables in thermal stress environments.
- Automotive: Heat-resistant cables in vehicles.
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Significance: Ensures cables maintain mechanical integrity, improving safety and performance in
critical applications.
"BS EN 60811-509: Ensuring Cable Durability Under Thermal Stress."