If the cross-sectional area of conductor is less than 100mm2 .Then specimen must be put into testing chamber for freezing for one hour, after that immediately rolls specimen around the specified rod in a uniform speed. Otherwise, for the cross-sectional area over 100mm2, roll the specimen beforehand and put into chamber for freezing one hour. Afterwards, immediately roll specimen around the rod in reverse direction. Finally, take out of specimen for checking whether its surface has crack or fissure or not.
