Weak current refers to the low voltage direct current (dc), audio, video, Internet, telephone lines, etc. Low voltage dc voltage generally under 36 v, general consumer electronics signal transmission is the use of weak current, such as computer, television, telephone signal output input, audio equipment, some of the bigger power weak current specific low voltage cable is required.

Heavy current and weak current in concept and easy to distinguish, in the way that they use are not the same. Elv mainly transmitted signals, is a kind of electric signal, high voltage to drive the machine, is a kind of power energy. According to different use kind, use different electricity, of course, different types of electricity need different cable, high voltage cables, using high voltage elv using low voltage cables. In order to maintain the integrity of the weak current signal, and is not affected by other power supply, the need to use special cables, to maintain the normal and conveying pictures of the pigment image distortion, not be able to complete the transportation task perfectly.

High voltage unit is large, weak current unit is small, but the size of the voltage is not distinguish between strong and weak electricity standards and methods. Before the 70 s, weak current just be used as phone and radio propagation effect, by the 80 s, after it is added to the fire, linkage control, monitoring equipment, air conditioning control, and so on, with the development of the society, weak current field is more and more big, the technology is getting better and better.

Intelligent system is composed of weak current, of low voltage cable and terminal equipment, is a modern building structure is very important in a system. Only words system, including the equipment automation system, safety protection system, communication and network system, fire automation system and so on 5 a system, we say at ordinary times family internal management on the data collection circuit, known as intelligent circuit.

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