Abstract: In the product verification and certification test of arc fault detective device,the quality of cable carbonization has impact on the efficiency of test significantly.The success rate of carbonization can not keep in a high level due to the randomness of cable making.This paper provided a way to increase the success rate of cable carbonization.After research into the step of cable making the paper replaces the creepage distance which is hard to measure with appropriate bending angle,and represents stop smoking in carbonization by specific criteria current through carbonization path.These two values prove each other correlatively so that we find a way to increase the success rate of cable carbonization.

Key words: AFDD, cable carbonization, creepage distance, criteria current