The safety performance testing of mining optical cables is a key link to ensure the reliable operation of underground communication systems in coal mines. Based on search results and industry standards,Key attention should be paid to the safety performance testing of mining optical cablesstructural integrity、flame retardancy、mechanical propertiesandenvironmental adaptabilityThe specific testing methods for core indicators are as follows:

Structural integrity testing

• Outer sheath testing: Check thickness, uniformity, surface defects, and peel strength to ensure crack resistance and wear resistance. ‌

• Armor layer testing: Verify the diameter, twisting direction, and tensile strength of the steel wire to prevent mechanical damage. ‌

• Water blocking performance: Test the longitudinal/radial water blocking ability to prevent water infiltration from affecting signal transmission. ‌

Electrical safety testing

• Voltage withstand test: Apply AC 1500V or DC 2000V high voltage between the live parts and the casing for 1 minute to ensure no breakdown. ‌

• Insulation resistance test: using a 500V megohmmeter

  Measure insulation resistance, with a requirement of ≥ 10M Ω.

• Leakage current test: Measure leakage current at rated voltage, usually ≤ 0.5mA. ‌

Mechanical performance testing

• Tensile strength: Tested by a tensile testing machine to ensure compliance with standards such as GB/T 19666. ‌

• Repeated bending: Simulate the laying process and verify durability under bending radius. ‌

• Flattening and impact: Test the structural stability of the outer sheath under compression or impact. ‌

Flame retardancy and fire resistance testing

• Single vertical combustion: Evaluate combustion speed and self extinguishing performance, in accordance withGB 31247requirement. ‌

• Bundled combustion: Test the flame spread and smoke density when multiple optical cables are burned simultaneously. ‌

Environmental adaptability testing

• Temperature and humidity cycle: Simulate the temperature difference at the end of the mine (such as -20 ℃ to 70 ℃) to verify material stability. ‌

• Corrosion resistance: The outer sheath's resistance to acid and alkali corrosion is tested through salt spray testing. ‌