The casing of a household electrical distribution box, often made of metal or plastic, serves as a protective enclosure for circuit breakers, bus bars, and internal wiring . Its primary purpose is to prevent accidental contact with live electrical components and to provide a secure housing for the electrical system.
Metal casings are conductive, so if they were not grounded, they could become electrified due to internal faults or induced charges from strong electric fields . To prevent this, the casing is connected to the grounding system of the house. This ensures that any stray voltage or fault current is safely diverted to the earth, protecting anyone who touches the box . As a result, under normal operation, the metal casing does not carry live electricity and is safe to touch.
Plastic or PVC casings are non-conductive, so they inherently do not carry electricity. They provide insulation and reduce the risk of electric shock even if internal wiring faults occur .
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