The distribution box enclosure can be made of steel, aluminum, or high-quality plastic such as PVC, polycarbonate (PC), or Acrylonitrile Styrene Acrylate (ASA) depending on the environment . Steel or aluminum is preferred for industrial or outdoor use due to durability, while plastic is suitable for indoor applications. The enclosure should have an IP or NEMA rating appropriate for the location: higher ratings provide better protection against dust, water, and corrosion .
Choose a box that matches the total electrical load of the building or facility, with some extra capacity for future expansion . Each circuit should have its own breaker or fuse, and the “one equipment, one switch, one RCD” principle should be followed to ensure safety . For residential setups, main distribution boards (MDB) and sub-distribution boards (SDB) are common, while industrial setups may require motor control centers (MCC) or power distribution units (PDU), .
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