My laptop is a boot password is welcome and then open the machine, there is a mouse and a black screen, I ask, how to solve this problem? More
There are two reasons: First, because the high-voltage cable is a distribution line, easy to have lightning surge voltage, fault burst will spread to the rest of the trench, co-channel, co-cable, resulting in the potential risk of accident expansion. Second, the high-voltage cable electric field strength, low-voltage cable if the secondary protection cable, the external magnetic field interference, temperature interference will be more sensitive, so in order to low-voltage cable internal current and voltage characteristics, generally do not allow trenching, co-laying. High-voltage cable: high-voltage cable is a kind of power cable, is used to transmit 10KV-35KV (1KV = 1000V) between the power cable, and more used in power transmission of the main road. High-voltage cable product implementation standards for the GB / T.2-2008 and GB / T.3-2008.
2 - 2 (cable line); NH - that wire or cable with "fire resistance" performance (usually increase the mica tape wrap); K - that is "control"; VV - PVC insulation, poly 2 * 1.5 - that (each cable line) consists of two wires, called the 2-core cable, (conductor is copper core).
There are two reasons: First, because the high-voltage cable is a distribution line, easy to have lightning surge voltage, fault burst will spread to the rest of the trench, co-channel, co-cable, resulting in the potential risk of accident expansion. Second, the high-voltage cable electric field strength, low-voltage cable if the secondary protection cable, the external magnetic field interference, temperature interference will be more sensitive, so in order to low-voltage cable internal current and voltage characteristics, generally do not allow trenching, co-laying.
