EN 50399 Burning behaviour of bunched cables


The EN 50399 was based on IEC 60332-3 with the addition of heat release measurement and a modified air inlet system.This is accomplished by fitting a small instrumented section of ducting into the exhaust system of the rig and using this with associated FTT gas analysis instrumentation and software.The duct section houses all gas sampling probes, temperature and mass flow probes and has ports for the smoke measuring system.


Duct section placed in EN 50399 exhaust


EN 50399 Cable Test Interior detail


EN 50399 Schematic


The gas analysis instrumentation is housed in a 19" instrument rack containing: - ■


Oxygen Analyser (paramagnetic) supplied with temperature and pressure compensation for primary heat release measurement.


■ Carbon Dioxide Analyser (infrared) for use in heat release measurement. ■


■ Controls for the smoke measurement system (if purchased). ■ Data logger (if purchased).


Clients already owning the FTT Dual Cone Calorimeter, ISO 9705 Room/Corner test or SBI can use their instrumentation to measure heat release rate from their cable test. Conversely the EN 50399 Gas Analysis rack can be used to instrument other calorimeters (e.g. FTT Dual Cone Calorimeter etc.).


FTT offers two smoke measurement systems, laser or white light.The laser system is similar to that used in the cone calorimeter and complies with ISO 5660 incorporating an advanced noise reduction specification.The white light system is similar to that used in the SBI test and constructed to DIN 50055.


EN 60332-1-2 Tests on electric and optical fibre cables under fire conditions.


Part 1-2:Test for vertical flame propagation for a single insulated wire or cable – Procedure for 1 kW pre-mixed flame


This part of EN 60332 specifies the procedure for testing the resistance to vertical flame propagation for a single vertical electrical insulated conductor or cable, or optical fibre cable, under fire conditions. EN 60332-1-2 specifies the use of a 1 kW pre-mixed flame and the test evaluates the flame spread of a cable under exposure to a small flame.The test is relevant for the classes B1ca


,B2ca ,Cca ,Dca and Eca .


Dual stage soot filter, refrigerant cold trap, drying column, pump and waste regulators for conditioning the sample gases prior to analysis.


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