In the electric power system, the voltage below 36v is called safe voltage, the voltage below 1kv is called low voltage, the voltage above 1kv is called high voltage, the line that directly supplies power to the user is called the distribution line, such as the user voltage of 380/220v, it is called the low-voltage distribution line, which is also known as the strong power in the home renovation (because it is the highest voltage used in the home). Strong electricity generally refers to the alternating current voltage of 24V or more. Such as lights in the home, sockets, etc., the voltage of 110V ~ 220V. lighting fixtures, electric water heaters, heaters, refrigerators, televisions, air conditioners, audio equipment and other electrical appliances in the home electrics are strong electrical equipment.
Intelligent system for building equipment monitoring system, security systems, communication network systems, information network systems, automatic fire alarm and fire linkage systems, to centralized monitoring, control and management for the purpose of the integrated system; home a variety of data collection, control, management and communication control or network systems and other lines, is called intelligent line (also known as home improvement) (also known as weak electricity in home improvement). Weak electricity generally refers to the DC circuit or audio, video lines, network lines, telephone lines, DC voltage is generally within 24V.