1. Common burning failure of distribution cabinet
Burning loss of aluminum contact of bus, parallel leakage circuit breaker or open circuit of distribution cabinet, burning loss of RTO fuse at the lower end of distribution cabinet, burning loss of low-voltage instrument, air outlet or arrester of distribution cabinet, loose tightening of contact screw of equipment of distribution cabinet, heat discharge, internal short circuit of distribution cabinet.
2. Management cause burning
Because of the short circuit between the lines at the receiving end, leakage protection or idle running current exceeds the rated current, making the protection or idle or empty lead and the terminal ignite, burning the distribution box.
The outgoing line distribution room is a class IV line and t low-voltage outlet steel pipe. The standard U-shaped waterproof can not be bent, which leads to rainwater leakage protector. When the load is too large or the current is too high, the heater will be heated, causing fire damage.
In thunderstorm weather, the low-voltage arrester of the distribution cabinet in rural distribution room fails due to excessive lightning current, which leads to the ignition of the arrester, the ignition of the instrument lead of the distribution cabinet and the damage of the distribution cabinet. And the ground wire is not qualified or not, prosecutors have not checked, leading to lightning weather caused by burning, which is one of the main reasons.
3. Burning loss due to technical reasons
The unreasonable capacity of distribution cabinet is too small, which leads to the overload of distribution equipment and the combustion of electrical equipment when it is overloaded. The lightning protection facilities of distribution cabinet are not perfect. First of all, the simple distribution cabinet is not equipped with low-voltage arrester. Second, the distribution cabinet is not grounded safely and reliably according to the technical specification of low voltage power grid.