Why are distribution boxes made of metal
- When there is a strong electric field outside the casing (such as lightning), the positive and negative charges on the conductor casing are rearranged on both sides of the casing under the action of the electric field, and the built-in electric field formed can just be balanced with the strong external electric field. The equipment inside the case is not affected by the external strong electric field, that is, it can protect against lightning
- The chassis can be grounded, and the ungrounded chassis will induce charges on the chassis due to the strong internal electric field, so that the chassis is charged. After the chassis is grounded, the induced charges on the chassis can be quickly discharged , Protect the safety of operators.
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