Electrical Box Burning Fault - Prompt

2023-12-15

Electrical Box Burning Fault - Prompt

Taking one example of a burnt electrical box as an example, after disassembling the damaged electrical box, it was found that one set of electrical boxes (the most severely burned part is at the idle lifting relay socket on the electrical box): between the idle lifting relay and the electrical box, there is green oxide at the idle lifting relay on the printed board inside the electrical box. This phenomenon does not occur in the electrical box itself, and the printed board of the electrical box will not burn. After disassembling the idle lift relay, it was found that the relay itself was intact and there were no issues such as overcurrent or short circuit. From the damaged electrical box, it can be seen that there is no open flame. The damage was caused by prolonged heating, and the black residue left on the printed board was melted into the outer shell of the electrical box due to prolonged heating. Based on this judgment, the electrical box is an unknown liquid (which has weak conductivity) flowing into the interior of the electrical box, causing long-term conductive heating inside the electrical box and resulting in the burning of the electrical box (the original bus had experienced such burning due to the flow of brake oil into the electrical box); Another set of electrical boxes (the most severely burned part is at the A connector on the electrical box): no obvious green unknown oxide was found, and the most severely burned part is at the A connector on the electrical box (the damaged A connector pins are no longer present). The possible reasons for the burning of the electrical box may be: 1) weak conductive liquid flowing into it, 2) poor contact of the connector harness.

Notes:
1. When using, it is necessary to ensure that the working environment of the electrical box is clean, and no liquid or residue is allowed to flow onto the electrical box.
2. Users regularly inspect the electrical box and are required to avoid splashing water on it when washing the car.
3. During maintenance, relays, fuses, etc. should not be unplugged at will. Once unplugged, there may be errors when reconnecting. During the maintenance process, the vehicle's electrical box should have protective measures to prevent debris such as sawdust and iron slag from falling into the box.

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