1. What do you mean by strong current and weak current?
1, high voltage
Strong electricity refers to the electric part in the electric field. The high-voltage frequency is generally 50 Hz, which is used for industrial electricity; The frequency of weak current is often high frequency or ultra-high frequency, measured in kilohertz and megahertz; Of course, there are also high-frequency and intermediate-frequency devices in high-voltage electricity, but the current is relatively large and the voltage is high. For example, flashlights, electric razors or high-voltage electricity, although the voltage is very low. They also spread in different ways. Weak current transmission is divided into wired and wireless, and strong current is transmitted through transmission lines.
2. Weak flow
Weak current generally refers to DC circuits or audio, video lines, network lines and circuits, and the DC voltage is generally within 32V. Household appliances, such as computers, TV signal input (cable TV line) and audio equipment (output line), are all weak current electrical equipment.
Second, the strong current weak current wiring construction specification
Determine the key points:
1. Basis for determining points: Mark the positions of the cassettes at each point with a pencil, ruler or Amodou according to the wiring design of the office space and the schematic diagram of the office station.
2. Determination of cassette height: except for special requirements, the cassette height should be the same as that of the original high-voltage socket, and the height of the background music tuning switch should be the same as that of the original high-voltage switch. If there are multiple cassettes, the distance between cassettes should be at least10 mm.
3, determine the location of the junction box:
1) embedded: the width and height of the weak current junction box are increased by 10 mm and the depth is decreased by 10mm respectively. ..
2) External type: mark the position of the fixing hole according to the model size of the product used.
3) Built-in type: determine the height of the pipeline entering the products used.
Slotting:
1. Determine the slotting route according to the following principles:
1) short route principle.
2) Don't destroy the original high-pressure principle.
3) Do not destroy the waterproof principle.
2. Determine the slot width: determine the number of PVC pipes according to the number of signal lines, and then determine the slot width.
3. Determine the grooving depth: if 16mm PVC pipe is selected, the grooving depth is 20mm；; If 20mm PVC pipe is selected, the grooving depth is 25mm.
4. Appearance requirements of trunking: horizontal and vertical, with the same size.
5. Measurement of trunking: The trunking of cassette and distribution box shall be calculated separately. All trunking shall be measured from the beginning to the end of trunking. If the width of trunking exceeds 80mm, it shall be calculated according to the length of double trunking.
Wiring:
1, to ensure smooth cable:
1) test of network cable and cable: make crystal heads respectively and test the connection and disconnection with network tester;
2) Test of cable TV cable, audio-video cable and audio cable: test the on-off with multimeter respectively;
3) Other cables: test the connection and disconnection with corresponding professional instruments.
2, determine the line length of each point:
1) Measure the length from the junction box slot to each point;
2) Add the length of redundant lines and distribution box slots at each point: the length of outgoing lines at each point is 200mm-300mm；; Inside the distribution box: the line length is 500mm; at the background music exit: the line length is 1.5m-2m.
3. Label determination: After cutting all kinds of cables according to a certain length, put labels on both ends of the line, indicating: weak current type-room-serial number.
4. Determine the number of wires in the pipe: the cross-sectional area of wires in the pipe shall not exceed 80% of the cross-sectional area of the pipe.
Sealing groove:
1. Fix the cassette: except for the cassette in the kitchen and bathroom, which should protrude 20mm from the wall, other cassettes should be flush with the wall. When several boxes are together, they are required to be on the same level.
2, fixed PVC pipe:
1) PVC pipes on the ground must be fixed every one meter.
2) PVC pipes in the geosyncline shall be fixed every two meters.
3) PVC pipes with wall grooves must be fixed every one meter.
3. Groove sealing: The wall and ground after groove sealing shall not be higher than the plane.
4. Clean up the construction site: after the trench is closed, remove the garbage and clean up the construction site.
The above is the meaning of strong current and weak current that Bian Xiao shared for you, and the related information of construction specification of strong current and weak current wiring. I hope it helps you.