Specification for grounding terminals and grounding wires of rural lighting electrical Ready Board Box in Africa

The lighting electrical ready board for rural areas in Africa shall comply with SANS 10142 and IEC 60364 standards, and be compatible with the TT grounding system of the Eskom project. The main grounding terminal wiring area inside the box shall be copper not less than 6mm ²; If the box is integrated with SPD lightning protection module, the wiring area of the main grounding terminal should be increased to 16mm ², and the terminal opening and clamping structure must match the corresponding grounding wire diameter to ensure reliable crimping.

The cross-section of the grounding terminal and the PE protection wire follows the IEC matching principle: when the phase wire is ≤ 16mm ², the PE grounding wire and the phase wire have the same cross-section; The phase line is between 16-35mm ², and the minimum PE line is 16mm ²; If the phase line is greater than 35mm ², the PE line should be taken as half of the phase line cross-section. For ordinary lighting branch circuits, the branch grounding terminal in the lighting electrical ready board should be compatible with a minimum of 2.5mm ² yellow green copper core PE wire; The grounding terminal for the box shell and door should be compatible with a soft copper grounding wire of no less than 4mm ².

The soil resistivity in the wild environment of Africa is relatively high, with frequent sandstorms and large temperature differences. Copper material is preferred for grounding terminals, and the surface is treated with anti-oxidation. The terminal clamping bolts adopt anti loosening structures to avoid vibration loosening. The capacity of the grounding terminal must have a margin and cannot be selected based solely on the theoretical minimum wire diameter. All grounding wires shall use yellow green dual color insulated copper wires uniformly, and aluminum wires are prohibited. The main grounding terminal should be clearly marked with a grounding symbol, and each grounding wire should be independently connected to the terminal. Series grounding is strictly prohibited to ensure the rapid discharge of leakage and lightning currents, and to meet the long-term safety requirements for outdoor lighting in rural Africa.