A BB fertilizer production line consists of industrial electrical equipment designed for continuous operation. To ensure the safe operation of the NPK bulk blending machine—and to prevent electrical leakage and electric shock hazards—the grounding protection system must be installed in strict compliance with standards and connected reliably. During both construction and operation, particular attention should be paid to the following precautions:
First, a dedicated protective grounding system must be strictly implemented. The power supply system should adhere to the “three-phase five-wire” standard, wherein the protective earth wire (PE) is laid out separately. It is strictly prohibited to mix, cross-connect, or share a single wire with the neutral working wire (N); this prevents the neutral wire from becoming energized—a condition that could trigger electric shocks or cause equipment malfunctions. The metal enclosures and structural components of all motors, distribution boxes, control cabinets, frames, screw conveyors, mixers, screening machines, packaging machines, and similar equipment must be individually and reliably connected to the grounding system. No piece of equipment or section of metal framework may be omitted.
Second, grounding materials must be selected in accordance with national standards—specifically, flat steel, round steel, or copper-core grounding wires. Connection points must be secured with bolts and treated with anti-rust agents to ensure excellent contact and reliable conductivity; loose connections, simple wire wrapping, or clamping onto rusted or painted surfaces are strictly prohibited. Grounding electrodes must be buried in moist, highly conductive soil. The grounding resistance must be strictly maintained below 4Ω; upon completion of installation, specialized instrumentation must be used to verify compliance before the production line is put into operation.
During operation, the grounding wires should be inspected regularly for looseness, corrosion, or breakage; if any issues are detected, operations must be halted immediately to address the problem. Grounding wires must not be arbitrarily removed or modified, nor should any other objects be suspended from them or other electrical devices be spliced into them. Furthermore, the system should be equipped with comprehensive auxiliary safety measures—including leakage protection devices, as well as short-circuit, overload, and phase-loss protection—to work in conjunction with the grounding protection system. Together, these elements form a complete safety defense framework, ensuring the operational safety of the BB fertilizer production line, the safety of operating personnel, and the stability and reliability of the equipment.
