Based on the usage environment, safety regulations, and operational convenience in rural Africa, the installation position of the main switch in the lighting electrical ready board should follow the core principles of "easy operation, prevention of accidental contact, and prevention of hidden dangers". The specific requirements are as follows.

In terms of the position inside the box, the main switch should be installed on the upper part of the inside of the electrical ready board, near the power inlet end, and in a prominent position after the box is opened. It should be arranged in a separate area from the branch switch, with the left side connected to the power supply and the right side connected to the load, to avoid confusion with the branch switch and facilitate quick identification and operation. During installation, it should be fixed on the insulation installation board and kept at a reasonable distance from other electrical appliances inside the box to ensure unobstructed operation and facilitate later maintenance and wiring.

In terms of height and operating space, the overall installation height of the electrical ready board must comply with regulations. The center point of the fixed box should be 1.4-1.6m above the ground, suitable for the operating height of adult people in rural Africa. It is easy to touch the switch without bending over or tiptoeing. Adequate operating space should be reserved around the box, with no debris piled up, to ensure the space requirement for two people to work simultaneously and avoid collisions during operation.

In terms of safety protection, the main switch should be kept away from the inlet and outlet of the box to avoid potential hazards caused by exposed wire joints. The inlet and outlet should be prioritized at the bottom of the box and sealed properly. At the same time, the installation position of the main switch should be higher than the ground by a certain distance, taking into account the humid and water prone environment in rural Africa, to prevent ground moisture erosion or water splashing onto the switch and reduce the risk of short circuit.

In addition, the main switch should be clearly marked for villagers to quickly find. During installation, it should be ensured to be firm, without tilting or loosening, and to balance ease of operation and safety regulations. It is convenient for daily power on and off, and can also quickly cut off the power in case of sudden faults, ensuring electrical safety.