The construction quality of a project can be seen from the wiring project. The wiring is not standardized, which directly affects the overall stability of the project. For a project, the amount of pre-wired engineering accounts for three-thirds of the entire project construction period. Second, using a good transmission system, or equipped with a construction team with super-strong construction experience, will definitely play a decisive role in the quality of the entire system. Since the wiring system is so important, what should be paid attention to the wiring? What?
1. Cable marking content: The manufacturer's factory name or code and cable type specification, 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 length of the twisted pair cable is usually 3~6m; the terminal is 0.3~0.6m; the reserved length of the 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 the movable floor is laid between the equipments, the plates are laid tightly and sturdy. The allowable deviation per square meter should not exceed 2mm. The floor pillars are firm. The grounding of the anti-static measures of the raised floor should meet the requirements of design and product description.
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. The 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 of the outer diameter of the cable.
c. The bending radius of the trunk twisted pair cable shall be 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 the construction process.
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 when the cable is subjected to external tension, the whole cable is stressed, otherwise the force is the metal part of the cable and the joint.
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. The two ends of each double glue line should be glued and numbered for easy installation and maintenance.
16. Provide reliable construction power and grounding devices between the junction room and the equipment room.
17. The temporary power supply at the construction site should have a complete plug. switch. socket. The leakage protector is set, and the cable must be used for temporary power. The power cord is divided into three colors: fire red. Zero line blue. Ground wire**. All unidirectional sockets should be "left zero right fire middle ground" or "fire down 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 is horizontal and vertical, can not be diagonally pulled to prevent being hammered. Nail damage.
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 and the like.
Universal before and after a film
All inclusive before and after, all-round protection
Suitable for mobile phone front/rear film, watch, AirPods, camera
All-inclusive surface, reject white edges
Seamless fit, no warping, no ash
NO cutting times code on package
Specification
180*120mm For iPhone and Android phones
HD Hydraulic Film ( 180*120mm )
Anti-blue light Hydrogel Film ( 180*120mm )
Matte Hydrogel Film ( 180*120mm )
Privacy Hydrogel Film ( 180*120mm )
Green Hydrogel Film ( 180*120mm )
UVRAY Hydrogel Film ( 180*120mm )
Back films ( random design ) ( 180*120mm )
300*200mm For ipad /Tablets :
HD Hydraulic Film ( 300*200mm )
Anti-blue light Hydrogel Film ( 300*200mm )
Matte Hydrogel Film ( 300*200mm )
Explosion-proof Hydrogel Film ( 300*200mm )
Hydrogel Screen Protector,Nano Hydrogel Tpu Sheet Film,Cutting Machine Tablet Films,Cellphone Protector Machine
Mietubl Global Supply Chain (Guangzhou) Co., Ltd. , https://www.mietublmachine.com