The primary short circuited melted mark identification must be scientific and objective for physical evidence of the electricity fire during detecting

and the conclusions  are related to the fire survey process. Currently

identification method of electricity fire

including macroscopic method and metallographic method

is very general and lacking of standard reference map and detailed description

The character of first short circuited melted mark is short of summary as well as analysis in actual fire cases. The macroscopic and metallographic character of melted mark from three class typical actual fire cases caused by first short circuited are analyzed. These cases include house

warehouse and workshop. Compared with character of melted mark from national standard

the simulated experiment is discussed. The relationship is summarized between the first short circuited melted mark and the surroundings. At the last

it is proposed that the attention points of using the first short circuited can provide for judgment and reference criterion of it.