the performance requirements for a particular type or class of insulated conductor or cable should preferably be given in the individual cable standard. In the absence of any given requirement, it is recommended that those given below should be taken as a minimum acceptable level.
The insulated conductor or cable shall pass the test if the distance between the lower edge of the top support and the onset of charring is greater than 50 mm.
in addition, a failure shall be recorded if charring extends downwards to a point greater than 540 mm from the lower edge of the top support.
if a failure is recorded, two more tests shall be carried out. if both tests result in passes, the insulated conductor or cable shall be deemed to have passed the test.