Encyclopedia of electricity: general provisions of relay protection

(1) Power equipment and wiring in civil buildings should be equipped with short circuit fault and abnormal operation relay protection device. Protection of power equipment and short-circuit fault should be the main protection and backup protection, if necessary, additional protec

Renovation of old communities cannot rely on "one hand"

With the development of China's economy, people's living standards continue to improve, and due to the passage of time and certain historical reasons, many supporting facilities in old communities have begun to age, and public services cannot meet the needs of households. , The other