Tracking Phenomenon and Fire of Organic Insulating Materials

Tracking phenomenon, to put it plainly, is the phenomenon to form the carbonized electrical track and lose insulation in the part with potential diŠerence on the surface of insulating materials. Tracking resistance means the di‹culty occuring the tracking phenomenon of the organic insulation materials. Studies on the tracking phenomenon and the method of evaluating tracking resistance has been often reported on so far. But, there are only a few comprehensive researches and commentaries which include tracking phenomenon and the ˆre which occurs by the tracking phenomenon. Hence, I decided to explain tracking phenomenon of the organic insulating materials and the phenomenon that developed concerning the ˆre which develops and is called, tracking ˆre. Tracking phenomenon is discussed ˆrst. Next, cases of tracking ˆre in electric wiring and the wiring utensil and the studies on the cause of tracking ˆre are explained. Furthermore, prevention of tracking ˆre and future problems are also discussed.