1. Spacing between components should be convenient: cable connection, component operation, component maintenance and replacement, component arc distance, etc.

2. The location of the cable should be determined according to the type and specification of the cable, especially the inlet and outlet ends. If the cable is large and the space is small, it may not bend the cable.

3. Consideration should also be given to whether there is enough space between the panel mounting elements and the components in the box, and whether the installation position of the panel elements can open the door, etc.