What is weak current engineering?

According to the intensity of power transmission, power applications can be divided into two categories: strong electricity and weak electricity. Weak current system is mainly aimed at buildings, including buildings, residential areas, airports, docks, railways, highways and so on. Weak current in intelligent building has two meanings. One refers to low-voltage electric energy such as safe voltage grade and control voltage specified by the state, which is divided into AC and DC, with AC below 36V and DC below 24V, such as 24V DC control power supply or emergency lighting standby power supply; Second, it refers to information sources including sound, image and data, such as telephone, television and computer information. Generally speaking, weak current system engineering refers to the second application.