Reasons for abnormal noise in rural lighting electrical ready boards in Africa and emergency response measures

There are several main reasons for the occurrence of abnormal noise in outdoor lighting electrical ready boards in rural Africa due to long-term exposure to high temperatures, thunderstorms, dust, unstable voltage, and outdated power lines. One common cause is the looseness of internal wiring terminals, which leads to arc vibration and buzzing sound caused by fluctuations in line load. The second issue is that the iron cores of air switches and leakage protectors have aged and become damp, resulting in abnormal electromagnetic resonance sounds. The third issue is the accumulation of moisture and dust inside the box, which causes short circuits and abnormal noises in the components, resulting in a high incidence during the rainy season. The fourth reason is that outdoor voltage fluctuations are large and the neutral wire is falsely connected, which leads to unstable current and component vibration. The fifth issue is that the box is not securely fixed, internal components are displaced, and there is friction noise caused by wind and vibration. Emergency response should prioritize ensuring electrical safety, cutting off the main power supply of the electrical Ready Board Box as soon as possible, and prohibiting live inspections. Quickly clean the accumulated water and dust on the surface of the box, dry the damp parts inside, and ventilate and dry the damp components. Check and tighten all incoming and outgoing wiring terminals, tighten loose screws, identify damaged insulation layers, and promptly wrap and protect the circuit. Check if the switch is burnt, hot, or deformed. If the switch is damaged due to a fault, stop using it immediately and replace it. Stay away from low-lying areas affected by lightning strikes, ensure that the grounding and lightning protection devices are in good condition, and avoid exacerbating faults caused by lightning strikes. Temporarily disable the lighting load of the abnormal noise circuit, reduce the electrical load, and avoid overloading that exacerbates abnormal noise and heating. After checking for no obvious faults, first conduct a small load test to observe if the sound disappears. If there is still abnormal noise, do not forcefully close the switch for use. It is necessary to seal and protect the box in daily life, regularly inspect and tighten the wiring, install voltage stabilizing protective components that are suitable for the local voltage environment, and reduce the incidence of abnormal noise and electrical failures.