The cover is simply pushed onto the distributor box header without screws. Locking clips ensure a secure hold. Simply press the locking clips forward with your finger and the locking mechanism. In this guide, we'll break down everything you need to know to install a distribution box correctly and confidently. Choose the right box based on environment (indoor/outdoor), load capacity, and durability. Check for proper IP/NEMA ratings and material quality. Ensure safe placement: install in. Location determination: Determine the installation position of the circuit breaker according to the position of the circuit breaker installation hole on the box cover. Distributor boxes bundle several cables into one master cable that is connected to the controller.