When we are doing weak electricity projects, we will always encounter such problems: What is the most important in weak electricity engineering? Which part is the construction focus? Will there be good system engineering quality with good products? In fact, the construction quality of a project is good or bad, which can be seen from the wiring project. The wiring is not standardized, which directly affects the overall stability of the project.
Take a project, the amount of pre-wired engineering accounts for two-thirds of the entire construction period, using a good transmission system, or equipped with a construction team with super-construction experience, will definitely The quality of the system plays a decisive role.
Since the cabling system is so important, what should the wiring pay attention to?
1. Cable marking content: The manufacturer's factory name or code and cable model specifications, manufacturing year, cable length are marked on the cable jacket at approximately 1M intervals.
2, plastic trunking and its accessories model specifications should meet the design requirements, and select the appropriate stereotypes. The ambient temperature of the laying place shall not be lower than -15 degrees Celsius, and the flame retardancy oxygen index shall not be lower than 27%. The inside and outside of the line groove should be smooth and free of ribs, and there should be no deformation such as distortion or warping, and there is a product certificate.
3. There should be redundancy when the cable is laid. In the cabinet, the reserved length of the twisted pair cable is generally 3~6m; the terminal is 0.3~0.6m; the reserved length of the optical cable at the equipment end is generally 5~10m; if there are special requirements, the length should be reserved according to the design requirements. .
4. When laying the raised floor between the equipment, the plate is laid tightly and sturdy. The allowable deviation per square meter should not exceed 2mm. The floor pillar is firm. The grounding of the anti-static measures of the raised floor should meet the design and product description requirements.
5. Each pair of twisted pairs should be kept twisted as much as possible, and the non-twisted length should not be greater than 13mm.
6. The stripping layer should not be scratched and should be stripped with special tools.
7. No joints may occur in the middle of the cable.
8. The longest line spacing of the twisted pair is 100 meters. The available twisted pair repeater connections over 100 meters are lengthened. The number of repeaters in each line cannot exceed three.
9. Optical fiber transmission distance: transmission rate 1Gb/s, 850nm, ordinary 50μm multimode fiber transmission distance 550m, common 62.5μm multimode fiber transmission distance 275m, new 50μm multimode fiber transmission distance 1100m.
10. The bending radius of the cable should meet the following requirements:
a Unshielded 4-pair twisted pair cable shall have a bend radius of at least 4 times the outer diameter of the cable and shall be at least 8 times during construction.
b The bending radius of the shielded twisted pair cable should be at least 6~10 times the outer diameter of the cable.
c The backbone twisted pair cable shall have a bend radius of at least 10 times the outer diameter of the cable.
d The bend radius of the cable shall be at least 1.5 times the outer diameter of the cable and shall be at least 20 times during construction.
11. When the twisted pair is connected to the information socket (RJ45), it must be snapped in the order of color code and line pair. The type of socket, color code and number shall be in accordance with the provisions of T568A and T568B.
12. When making the crystal head, the outer protective layer of the cable needs to be pressed in the joint and not outside the joint. Because the entire cable is stressed when the cable is subjected to external tension, otherwise the metal part of the cable and the joint is connected.
13. When the twisted pair cable is connected with the wiring module (IDC, RJ45), it should be operated according to the design and manufacturer's specifications.
14. The shielding layer of the shielded twisted pair cable is in reliable contact with the shield cover at the connector end. The cable shielding layer should be in circumferential contact with the connector shield 360o, and the contact length should not be less than 100mm.
15. Each end of the double glue line should be glued and numbered for easy installation and maintenance.
16. Provide reliable construction power and grounding devices in the junction room and equipment room.
17, the temporary power supply at the construction site should have a complete plug. Switch. Socket. Leakage protector settings, temporary use of electricity must use cables. The power line is divided into three colors: FireWire Red. Zero Line Blue. Ground Line **. All unidirectional sockets should be "left zero right fire middle ground" or "fire under zero" connection.
18. When the power line pipe passes under the ground, the casing must be tightly connected. No joints are allowed under the ground. Elbows must be applied to the ground. Before the ground is closed, the PVC casing must be protected from cracking damage. When the floor tiles are laid, the PVC casing should be covered. When the wooden floor is nailed, the power cable should be laid along the corner to prevent the power cord from being damaged by the nail.
19. The power cord runs horizontally and vertically, and cannot be diagonally pulled to prevent damage to the hammer and nail.
20, all kinds of strong and weak electrical socket interface should be as little as possible. All sockets. The switch should be above 300mm above the ground and will not be blocked by sliding door furniture.
21. A weak electric line and a strong electric line are not allowed to be shared with one tube, and the separation distance is 0.5m or more.
22, the power supply between the various sections of the project should be controlled as much as possible, as far as possible to provide separate power supply, do not worry about each other.
How can the wiring be standardized?
First, the quality of construction workers, and second, the attitude of construction workers. If the management personnel do not strictly demand, it will also cause the construction workers to be lazy. If the management personnel strictly demand, the construction is still not standardized, then replace the construction personnel. (conditions allowed)
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Specification:
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Material:ss304 ss316 ss316L
pressure:150# 300# 600# 900# 1500#
Size:DN15-DN2000
Surface treatment:anti-rust oil,yellow painting,black painting,hot galvanized,cold galvanized
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delivery:25days
transportation:by air,by ship,by train
Ansi B16.5 Stainless Steel Flange
ANSI B16.5 Stainless Steel Flange, Asme B16.5 Flange, Asme B16.5 Class 150 Flange
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