Specification for Reserve of Expandable Circuit Breakers for African Rural Lighting electrical Ready Board Box

The electricity load in rural areas of Africa is expanding year by year, and farmers are adding new lighting fixtures and small household appliances. electrical ready boards must reserve expandable circuit breaker installation positions, using DIN35mm standard guide rail modular reservation, suitable for on-site installation of small circuit breakers in the later stage. The conventional circuit configuration sets spare expansion bits at 20% to 25% of the total number of outgoing lines, with a minimum guarantee of 2 bits. Suggest reserving 4-5 positions for small circuit breakers.

The single expansion bit follows the national standard of 18mm modular width, with no pre installed components in the empty space. The guide rail fully penetrates the reserved area, and there is reserved space for internal wiring. The clear distance between components is ≥ 10mm, and the empty space is ≥ 15mm from the side wall of the box, meeting the wiring requirements for high temperature heat dissipation and humid environments.

Considering the characteristics of rural power supply in Africa, unstable voltage, temporary installation of pumping motors, frequent expansion of street lights, and lack of reserved expansion spaces can lead to unauthorized connections and external switches, increasing the risk of electric leakage and fire. Reserved space does not require matching wiring, and about 3m of spare incoming and outgoing wires are synchronously reserved inside the box for convenient on-site construction and rapid capacity expansion, which is in line with local operation and maintenance conditions and IEC rural distribution design standards.