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Any combustion flame of insulating material shall extinguish within 70 s and a minimum of 50 mm of insulation at the top of the test sample shall remain unburned.
12.3 Procedure
Suspend the test sample in a draught-free chamber and expose the test sample to the tip of the inner cone of
the flame, as shown in Figure 10. Apply the flame (500 ± 5) mm from the upper end of the insulation. Finish
the exposure to the flame when the conductor becomes visible, or after 15 s for test samples with conductor
sizes u 2,5 mm2 and 30 s for test samples with conductor sizes > 2,5 mm2.
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