The ground wire of the distribution box is 1 5 meters long

A 1.5-meter ground wire is generally sufficient for household distribution boxes if installed correctly and connected to a proper grounding electrode.Ground Wire Length and InstallationFor household distribution boxes, the grounding wire is typically connected to a grounding electrode such as a galvanized steel rod or pipe driven into the ground. The minimum recommended length for the grounding electrode is 1.5 meters, which ensures adequate contact with the soil to achieve low resistance and effective grounding . The ground wire itself should be securely connected to the grounding grid and the distribution box's ground bus bar, using proper fasteners like screws, nuts, and washers .Grounding EffectivenessThe effectiveness of the grounding system depends not only on the wire length but also on the grounding resistance, which should ideally be less than 4 ohms. If the resistance is higher, additional electrodes or deeper installation may be required . The ground wire should form a continuous path from the electrode to the distribution box, avoiding sharp bends or loose connections .Safety and ComplianceAll metal parts of the distribution box, including the box itself and internal metal components, must be grounded .The neutral wire should be properly connected to maintain load balance and prevent electrical hazards .Regular inspection and maintenance of the ground wire and connections are recommended to ensure ongoing safety .Installation should follow local electrical codes and standards, and if you lack experience, a professional electrician should perform the work .SummaryA 1.5-meter ground wire is standard for household distribution boxes when paired with a proper grounding electrode. Correct installation, secure connections, and periodic testing of grounding resistance are essential to ensure safety and compliance with electrical standards .