1. Ablation for technical reasons: the volume of distribution box is unscientific and too small, resulting in the load of substation equipment Electrical equipment ignites when loaded. The lightning protection equipment of the distribution box is not perfect. The simple distribution box is not equipped with low-voltage and high-voltage lightning arrester. The distribution box can not rely on the grounding device according to the technical standard of low voltage power grid.

2. Common ablation faults of distribution box: the small screws touched by the distribution box are not solid and hot, causing short-circuit fault of distribution box, so there will be more ablation of low-voltage distribution cabinet.

3. Ablation due to management method: the short-circuit fault line is in the power distribution cabinet where the coordinator, leakage protector or waiting for speed operation current is higher than the rated voltage, which makes maintenance or idle, or empty lead and terminal equipment ignite and ignite. There are also common faults of high-voltage lightning arrester due to excessive lightning current, causing the high-voltage lightning arrester to ignite, causing the conductor of the instrument panel of the distribution box to catch fire and damaging the distribution box.