In electrical systems, repeated grounding is an important safety measure, which refers to connecting ground wires in two or more places at the same time to improve the reliability and safety of the system. When it comes to repeated grounding in an electrical box, there are a few key steps that need to be paid special attention to ensure that the grounding is good and meets safety standards. 
First and foremost, it is crucial to choose the appropriate grounding point. Typically, the metal casing of the electrical box is an ideal grounding target. Make sure that the metal casing is well connected to the ground wire so that the current can be quickly channeled into the ground, thus avoiding the risk of electric shock. Secondly, the connection is made using a suitable conductive material. Common options include bare copper wire or other highly conductive materials. It is important to ensure that the connection is securely fastened and that the resistance is low to ensure that the ground wire can effectively direct the current into the ground. 
In addition, it is important to avoid ground rings between circuits. In electrical systems, special care should be taken to avoid the formation of loops with multiple ground connections, which can lead to circulation of ground loop currents. This condition not only causes electromagnetic interference, but can also have a negative impact on the proper functioning of the system. Finally, be sure to follow local electrical codes and standards. Different regions may have different grounding requirements and standards, so it's important to understand and follow local regulations when doing repeated grounding. This includes the use of prescribed ground wire specifications and connection methods to ensure a safe and secure grounding system. Overall, repeated grounding is to improve the safety and reliability of the electrical system. However, it is essential that this measure be implemented correctly. Following proper procedures and specifications ensures the effectiveness of the grounding system and guarantees the safety of personnel. 