Question 1: What does strong current and weak current include? Strong current includes system distribution lines, cables, cabinets, lighting fixtures, switches, sockets, lightning protection grounding, system debugging, lighting and socket piping and wiring. Power piping and wiring
Weak current refers to security monitoring, integrated wiring, alarm systems, etc. within 32V
Question 2: What kind of electronics does strong current belong to and what kind of electronics are weak current? People are used to classifying them into There are two parts: strong electricity (electricity) and weak electricity (information). The two are both related and different. Generally speaking, the processing object of strong electricity is energy (electricity), which is characterized by high voltage, large current, high power and low frequency. , the main consideration is to reduce losses and improve efficiency. The main object of weak current processing is information, that is, the transmission and control of information. It is characterized by low voltage, small current, low power, and high frequency. The main consideration is the effect of information transmission. Issues such as the fidelity, speed, breadth, and reliability of information transmission. Generally speaking, weak current projects include television projects, communication projects, fire protection projects, security projects, imaging projects, etc. and integrated wiring projects that serve the above projects. Weak current refers to strong current. Strong current = (380/220), regardless of high voltage
In the power system, voltage below 36v is called safety voltage, voltage below 1kv is called low voltage, 1kv The above voltage is called high voltage, and the line that directly supplies power to users is called distribution line. If the user voltage is 380/220v, it is called low voltage distribution line, which is what is called strong electricity in home decoration (because it is home Use the highest voltage). Strong electricity generally refers to AC voltage above 24V. For example, lights and sockets in the home, the voltage is 110V~220V. Lighting fixtures, electric water heaters, heaters, refrigerators, televisions, etc. in household electrical appliances. Electrical appliances such as air conditioners and audio equipment are all high-voltage electrical equipment.
Intelligent systems include building equipment monitoring systems, security systems, communication network systems, information network systems, automatic fire alarms and fire linkage systems. , a comprehensive system composed for the purpose of centralized monitoring, control and management; the control or network systems and other lines for various data collection, control, management and communication in the home are called intelligent lines (that is, what is called in home decoration Weak current). Weak current generally refers to DC circuits or audio, video lines, network lines, and telephone lines. The DC voltage is generally within 24V. In household electrical appliances, the signal input of telephones, computers, and televisions (cable TV lines), audio equipment ( Output terminal lines) and other electrical appliances are all weak current electrical equipment
Question 3: What are the strong current majors? Generally divided into high voltage, low voltage, internal wire, external wire, line, installation and maintenance electricians
Limited knowledge
Question 4: What do strong electricity and weak electricity refer to in electricity? Strong electricity refers to power electricity. Those that directly provide power to users are strong electricity, regardless of whether the voltage is 36 volts or 500 kilovolts. . The power supplies that control, monitor and operate strong electricity are all weak currents, which do not provide power to users
Question 5: What are the letters of strong electricity and what do they mean? Common letters and letters in strong electricity system diagrams Combinations include (for example):
SC70: Steel pipe with a diameter of 70mm, TC: Bridge, BV4: Copper core wire with a cross-section of 4mm2, PC (PVC) 25: PVC flame retardant with a diameter of 25mm Wire conduit, FC: laid in the floor, WC: laid in the wall, CC: laid in the ceiling.
In addition, there are some cable models that are also important:
1. Insulation type: V represents polyvinyl chloride; X represents rubber; Y represents polyethylene; YJ represents cross-linking Polyethylene; Z stands for paper.
2. Conductor material: L represents aluminum; T (omitted) represents copper.
3. Inner sheath: V represents polyvinyl chloride sheath; Y polyethylene sheath; L aluminum sheath; Q lead sheath; H rubber sheath; F neoprene sheath.
4. Features: D non-trickle; F phase separation; CY oil-filled; P lean oil dry insulation; P shielding; Z DC.
5. Control layer: 0 none; 2 double steel strips; 3 thin steel wires; 4 thick steel wires.
6. Outer cover: 0 none; 1 fiber cover; 2 polyvinyl chloride sheath; 3 polyethylene sheath.
7. Add ZR before the code for flame-retardant cables; add NH before the code for fire-resistant cables.
Oil-filled cable model and product representation method
The oil-filled cable model consists of the product series code and the code of each part of the cable structure. The product series code of self-contained oil-filled cable is CY. The structure of the outer sheath is represented from the inside to the outside by a combination of code names for the reinforcement layer, armor layer and outer covering layer. The insulation type, conductor material, inner sheath code and the arrangement of each code
The order and product representation method are the same as those for power cables of 35kV and below. For example, CYZQ102 220/1×4 represents a self-capacitance of copper core, paper insulation, lead sheath, copper tape radial reinforcement, unarmored, PVC sheath, rated voltage 220kV, single core, nominal cross-sectional area 400mm2 oil-filled cable.
The meaning of the code for the outer sheath of the oil-filled cable is 1. Reinforcement layer: 1 represents the radial reinforcement of the copper strip; 2 represents the radial reinforcement of the stainless steel strip; 3 the radial reinforcement of the steel strip; 4 the radial reinforcement of the stainless steel strip. Narrow stainless steel strips are reinforced longitudinally.
2. Armor layer: 0 no armor; 2 steel strip armor; 4 thick steel wire armor.
3. Outer layer: 1 fiber layer; 2 polyvinyl chloride sheath; 3 polyethylene sheath.
As for the switch types and air switches in the middle, it is usually decided by Party A and installed by our construction company, so the letters in this part are not read or read. Understand.
What I am talking about is only the main ones. For other things, you should look at an atlas related to the identification of building water and electricity diagrams for more details.
Question 6: What does the high-rise building electrical design include? The high-rise building electrical design includes: lighting distribution system, power distribution system, fire protection facility distribution and control system, air-conditioning distribution and control system, Lightning protection and grounding systems, power transformation and distribution systems (may include self-provided diesel generator system, solar power distribution and control system).
Question 7: What is the project of strong and weak current? The weak current system includes:
1)
2) Building management integrated system, namely BMS system
3) Mechanical and electrical equipment monitoring system, namely BAS system
4) Fire alarm system, namely FAS system
5) Security system (including image, anti-theft alarm , access control, patrol), that is, SAS system
6) Public broadcasting system
7) Cable TV system
8) Large display screen
9) Timing and scoring system
10) Parking lot charging management system
11) Integrated wiring system, namely PDS system
12) Network system
13) Clock synchronization system
14) Central control center construction
15) Lighting control system
16) Stage lighting Sound system
17) News release system
18) Television broadcast system
19) Video and telephone conference system
Strong power system includes
1. High and low voltage power distribution system.
2. Distribution transformer
3. Generator set
4. Power cable
5. Closed busbar
Question 8: Electrician: What is the scope of work for strong current and weak current? 30 points Conceptually, it is generally easy to distinguish between strong electricity and weak electricity. The main difference is the use.
Strong electricity is used as a power source, generally referring to power supplies above 220V. Weak electricity is used for information transmission, generally referring to telephones, networks, etc.
The scope of work of strong electricity generally refers to: repair, installation and maintenance of lighting, sockets, etc. in power distribution rooms and offices.
Weak current generally refers to: installation, repair and maintenance of telephone, network and other equipment.
Question 9: What majors in the university are related to strong electricity? Electrical engineering and its automation, power system and its automation,