Purpose of Vertical Flame Testing
During a fire event, cables may contribute to flame propagation if their insulation or sheath materials continue burning.
Vertical flame testing evaluates the fire behaviour of a single cable installed in a vertical position under controlled laboratory conditions.
The test helps assess:
Flame propagation resistance
Self-extinguishing capability
Extent of damage after burning
Performance consistency of cable materials
Test Evaluation Criteria
After testing, the cable sample is inspected based on several key criteria.
Flame Extinguishing Performance
The cable should stop burning within the specified time after removal of the ignition source.
Flame Propagation Distance
The damaged or carbonized area must remain within the permitted limit defined by the applicable standard.
Cable Damage Assessment
The burned section is examined to evaluate whether the insulation and sheath materials meet the required flame resistance performance.
Vertical Flame Test Conditions
For single cable vertical flame propagation testing according to IEC 60332-1-2, typical test conditions include:
Test Sample
A section of finished cable mounted vertically in the test chamber.
Flame Source
A 1 kW premixed flame applied according to the specified test procedure.
Inspection
After flame application, the cable is checked for flame spread and the extent of carbonization.
The required flame application duration depends on the outside diameter of the cable sample.
Flame Testing for Solar Cables
For photovoltaic cables such as H1Z2Z2-K, flame propagation performance is an important part of overall cable safety verification.
FRCABLE evaluates flame performance together with other reliability tests, including:
Gas Emissions Testing
Evaluates halogen-related gas release and combustion characteristics.
UV Weathering Testing
Assesses long-term sheath durability under simulated sunlight exposure.
Cold Impact Testing
Evaluates mechanical resistance under low-temperature conditions.
Hot Set Testing
Verifies the cross-linking performance of insulation and sheath materials.
Together, these tests help confirm the durability, safety and compliance of solar cables used in demanding environments.
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