BS EN 60811-509: Heat Shock Test for Cables

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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.

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