Based on the actual scenario of rural lighting in Africa (low load density, weak power supply stability, concentrated lighting demand and low power), the reasonable range of rated current for the lighting electrical ready board is 16A~63A, and the core commonly used range is 25A~40A. It needs to be flexibly adjusted according to the power consumption scale and load type, taking into account safety and economy.

Rural lighting in Africa is mainly distributed in households and simple public lighting. The single household lighting load is usually 50-200W (mostly using LED energy-saving lamps with low power and energy consumption), and the total lighting load in a single area (covering 10-30 households) is about 1-5kW. According to the formula I=P/(√ 3 × U × cos φ) (lighting load cos φ is taken as 0.85-0.95), the total working current is calculated to be about 6-30A. Therefore, a margin of 1.2-1.5 times the rated current needs to be reserved to avoid overload caused by starting current and load fluctuations.

Single household independent lighting electrical ready board (only supplying 1-2 households), with small and stable load, rated current of 16A~25A can meet the demand, which can avoid equipment waste caused by excessive rated current and prevent frequent tripping caused by insufficient rated current. Multi household centralized lighting electrical ready board (covering 10-20 households), with a relatively concentrated total load, with a preferred rated current of 25A~40A, suitable for the lighting needs of most rural areas.

If it involves small-scale public lighting (such as rural roads and village entrance lighting), adding a small number of 100-300W lamps can increase the total load to 5-8kW, and the rated current can be increased to 40A~63A. It should be noted that some rural areas in Africa have problems with unstable voltage and high line losses. The rated current value should not be too high (exceeding 63A can increase line losses and equipment costs), nor should it be too low (less than 16A cannot adapt to the impact current of multiple lamps starting at the same time).

In summary, the rated current of rural lighting electrical ready boards in Africa should be in line with the local load characteristics, with a reasonable range of 16A~63A and a core selection of 25A~40A. This not only ensures the stable operation of lighting equipment, but also meets the practical needs of low-cost and easy maintenance in rural areas.