The metal box of the distribution box, the electrical installation board, and the metal base and casing of the electrical appliances in the box must be grounded. The protective neutral wire should be reliably connected through the terminal board. Grounding and bonding limit overvoltages, stabilize the voltage to the ground during regular functioning, and ease the proper operation of circuit breakers and fuses. All grounding and bonding work must comply with NEC Article 250. Grounding electrode conductors must be connected at. Power from factory ground must be installed by a qualified electrician. Each DISTRIBUTION BOX and controller must be grounded. Grounding of the units: Attach a ground wire from one of. Metal raceways, cable trays, cable armor, cable sheath, enclosures, frames, fittings, and other metal noncurrent-carrying parts that are to serve as grounding conductors, with or without the use of supplementary equipment grounding conductors, shall be effectively bonded where necessary to ensure. We earth ground systems to the earth to reduce overvoltage (from lightning induced energy and other events) on the conductors and electrical components (such as transformer and motor windings) of the installation. Avoid installing in a humid and corrosive environment to prevent equipment damage.