What are the specifications or standards for weak current engineering construction?

The specification is Manual for Design and Construction of Weak Current Engineering in Buildings (Hardback Edition).

Design and Construction Manual of Weak Current Building Engineering (hardcover edition) is a practical reference book that systematically and completely introduces the design, construction, detection and acceptance technology of weak current building engineering.

It is suitable for engineers and technicians engaged in design, construction, supervision, acceptance and management in architectural design institutes, construction enterprises, electromechanical installation companies, security and intelligent system integrators, engineers and technicians engaged in real estate development and property management, teachers and students of related majors in colleges and universities, and all professionals who are interested in deeply understanding and comprehensively mastering the design and construction technology of weak current engineering in intelligent buildings.

There are two main types of weak electricity in buildings:

One is low-voltage electric energy such as safe voltage grade and control voltage specified by the state, which is divided into AC and DC. Alternating current below 36V and DC below 24V, such as 24V DC control power supply or emergency lighting standby power supply.

The other is information sources including sound, images and data, such as telephone, television and computer information.

The commonly used extended data of building weak current system mainly include the following:

(1) telephone communication system

Realize the communication function of the telephone (including three types of fax machines, videophones, etc.). ); Star topology; Using three (or more) unshielded twisted pairs, the frequency of the transmission signal is in the audio range.

(2) Computer local area network system

It is the network foundation to realize office automation and various data transmission; Star topology; Five types (or more) unshielded twisted-pair wires are used to transmit digital signals, and the transmission rate can reach more than100 MB/s.

(3) Music/Broadcasting System

Music can be played through loudspeakers installed on the site (such as shopping malls, stations, restaurants, guest rooms, corridors, etc.). ), and the scene can be broadcast through a microphone; Multi-channel bus structure; Constant voltage audio signals (such as120v120Ω) output by the power amplifier are transmitted to drive the on-site speakers to sound, and the transmission line adopts copper core insulated conductor.

(4) CATV signal distribution system

Distribute CATV signals evenly to all user points in the building; Branches and distributors are used for signal distribution. In order to reduce the signal distortion and attenuation, and make the signal quality of each user point meet the requirements specified in the specification, the wiring is tree-shaped and changes with the form of the building and the distribution of user points. Using 75 Ω RF coaxial cable to transmit multi-channel RF signals.

(5) Video monitoring system

Monitor the entrances and exits of buildings and some important places through cameras, burglar alarms and other equipment installed on site, and give an alarm if there is any abnormality; The transmission of video signal adopts star structure and uses video coaxial cable; The transmission of control signals adopts bus structure and uses copper core insulated cable.

Baidu encyclopedia-weak current engineering

Baidu encyclopedia-weak current