How many meters of ground wire should be installed in the distribution box

For proper grounding, a trench is dug near the distribution box, usually 1.5 meters in length, 0.5 meters wide, and 0.7 meters deep. A grounding electrode, such as a galvanized steel pipe or angle steel, is installed at the bottom of the trench, and the insulated copper ground wire is connected from the electrode to the ground bus bar inside the distribution box . The wire should be firmly fixed with screws, nuts, or washers to ensure a secure connection. The grounding system must meet resistance requirements, typically less than 4 ohms, and may require additional electrodes or deeper installation if the resistance is too high . The wire gauge depends on local standards and load requirements; for example, a 6 mm² copper wire is commonly used outside the US, while 10 AWG is standard in the US . Proper installation ensures safety by directing stray electricity safely into the ground, protecting both equipment and users. Regular inspection and maintenance are recommended to maintain grounding effectiveness .