For the actual lightning protection scenarios of rural lighting electrical Ready Board Box in Africa, the grounding resistance of SPD (Surge Protective Device) should not exceed 10 ohms; In areas where conditions permit or thunderstorms are prevalent, it is recommended to strictly control within 4 ohms to maximize lightning protection effectiveness.

1、 Core standard: Africa has vast rural areas, high soil resistivity (mostly sandy, red soil or arid soil), and weak power grid infrastructure. The general standard for SPD grounding resistance is ≤ 10 Ω. This standard takes into account both safety and construction feasibility, and is formulated based on IEC 61643, the "Code for Design of Lightning Protection of Buildings", and rural low-voltage distribution practices. Conventional area: Grounding resistance ≤ 10 Ω. Ensure rapid discharge of lightning current, suppress residual voltage of SPD, and protect end devices such as lamps and sockets. Thunderstorm prone/mountainous areas: grounding resistance ≤ 4 Ω. Lightning activity is extremely strong in the equatorial and central regions of Africa, and reducing resistance can effectively reduce reactive overvoltage and lower the risk of equipment burnout. In areas with high soil resistivity: If technical measures (such as resistance reducing agents and multi pole grounding grids) still cannot meet the standard, it can be relaxed to ≤ 30 Ω, but it must be combined with high current SPD (≥ 40kA) and equipotential bonding.

2、 Key construction points 1 Grounding body: Vertical grounding electrodes (≥ 2) made of angle steel/copper rods, buried at a depth of ≥ 0.8 meters, are connected in parallel to form a grounding grid. two Grounding wire: Multiple stranded copper wires with an area of ≥ 16mm ² are used from SPD to the grounding bar, connected in a short straight line (≤ 0.5 meters) to reduce inductive voltage drop. three Equipotential: The metal frame of the electrical ready board, device base, and grounding bar are reliably connected to eliminate potential differences. 3、 Conclusion: The conventional grounding resistance of SPD in rural lighting electrical ready boards in Africa is ≤ 10 Ω, and ≤ 4 Ω in high-risk areas, which is the optimal solution to balance safety, cost, and construction difficulty. Strict implementation can significantly reduce the lightning strike failure rate and ensure stable rural power supply.