Did not find the relevant norms. Fiber optic cable should not be affected by interference, electric corrosion this piece without taking into account? More
The final settlement is the completion of the drawings, the first to complete the map on the right, clear
Cable can be parallel with the 10kV power cable laying, there is no distance requirements, two cables walking in a metal bridge is no problem. Fiber optic cable is through the optical communication, the power line of electromagnetic waves will not have an impact on it, there is no problem of electrical corrosion, because the cable is protected by an outer sheath. Now in the high-voltage cable directly attached to the internal fiber and power supply and communication, but also in the high-voltage overhead lines directly on the composite fiber (OPGW), while the power supply and power grid communication. Fiber optic cable, is a certain number of fiber in accordance with a certain way to form a cable core, outsourcing jacket, and some also cover the outer cover, used to achieve optical signal transmission of a communication line. Generally consists of cable core, reinforced steel wire, filler and jacket and other parts of the composition, as well as the need for waterproof layer, buffer layer, insulated metal wire and other components.
Cable bridge at both ends to be installed across the ground wire, ground wire diameter can not be less than 16mm2. Wire ends and wire ends of the middle box to be installed at both ends of the ground wire, grounding wire diameter can not be less than 6mm2. Full length bridge with the grounding system connected to not less than 2. Cable bridge is divided into trough, tray and ladder-type, mesh and other structures, by the bracket, arm and installation accessories and other components. Can be set up independently, can also be attached to a variety of structures (structures) and corridor stent, reflecting the structure is simple, handsome in appearance, flexible configuration and easy maintenance features, all parts are required galvanized, installed in the building Outside the bridge, if it is in the vicinity of the sea or belong to the corrosion area, the material must have anti-corrosion, moisture resistance, good adhesion, high impact resistance of the physical characteristics. According to the relevant provisions of the specification, galvanized cable bridge for a good grounding. galvanized cable tray direct board each fixed bolt contact resistance should be less than 0.005Ω, then the cable bridge can be used as a ground trunk (dusting cable tray should not be used as a grounding line), the resistance of each cable bridge can be the following formula Calculate: r = ρ · L / S where: ρ = 15 × 10Ω-6 / cm (20 ℃); L = length calculated by 100mm; S = cross-sectional area of ??cm2. The unit resistance value of the ladder on the pallet is shown in Table 2. The unit resistance value of the cable duct is shown in Table 3 The resistance of each ladder (or each cable slot) after the installation of the cable tray is the total: R = R (r + 1 / 3r ') where: R - ladder, that is, (cable trough) total length of the total resistance (mΩ); r - ladder unit length resistance (mΩ / m)
My computer --- right-click properties. Device Manager. Look at the USB device is not there or the number. Have to reinstall the system. Also make sure your motherboard USB interface is not good. I said the interface is plug USE jumper of the root.
