Can high - voltage cables and low - voltage cables be placed on the same cable trench?
Hello: First, before the construction and renovation works, by the construction unit according to the construction map of the local trunking chisel, in the repair of the first trunking before the wire tube fixed firmly, and then clean the net trough of the dust and loose Building materials, water spray, according to the trunking repair the amount of choice to use fine stone concrete or cement mortar layered filling; Second, in the home decoration, according to the decorative drawings of the hydropower line transformation, resulting in part of the trunking, After fixing the pipe firmly, clean the base layer and fill it with gypsum, so that the construction speed is fast and the shrinkage cracks are not prone to occur.
The nominal voltage of the cable should be expressed in U0 / U, U is the voltage between the conductor and the conductor in the design of the cable, and U0 is the voltage between the conductor and the metal shield (simply the conductor to ground) when the cable is designed. In China, the general use of U to indicate the voltage level of the cable, which is the new China's early founding of the former use of the former Soviet Union standard to stay in the habit of the 10kV cable actually refers to the 6 / 10kV or 8.7 / 10kV cable, 10kV cable is the first type of system 10kV cable, 8.7 / 10kV cable is the second type of system 10kV cable, 6 / 6kV cable is the second type of system 6kV cable, 8.7 / 15kV cable is the first type system 15kV cable. Not because the 6 / 6kV cable and 6 / 10kV cable the same structure that they are 10kV cable. 8.7 / 10kV cable and 6 / 10kV cable insulation thickness is indeed different, but they are indeed 10kV voltage level of the cable, and are used in the 10kV voltage level of transmission or substation lines, but the line center point grounding different. 8.7 / 10kV cable 10kV line for non-effective grounding at center point, 6 / 10kV cable 10kV line for effective grounding (or direct grounding) at center point. Most of our 10kV cable lines belong to the center point of non-effective grounding system, so the use of 8.7 / 10kV cable more, the center of the effective grounding system lines are also, such as in the railway, petrochemical system has a central point of effective grounding 10kV line. Most of the 10kV cable lines in the Western countries belong to the center point of the effective grounding (or direct grounding) system, 6 / 10kV (or 6.35 / 11kV) cable with more.
. the power cable is generally made according to a certain voltage level, the voltage level followed by 0.5kV, .........330kV. One of the 1kV voltage level power cable used the most. 3 ~ 35kV voltage level of power cables in large and medium-sized buildings within the main power supply lines are often used. 60 ~ 330kV voltage rating of the power cable used in the use of overhead lines should not be used as the transmission lines and over the river, submarine laying and other occasions. . the cable can be divided according to the voltage level: 380V / 220V ~ 660V for the low voltage cable, 6kV ~ 35kV for the medium voltage cable, 110kV ~ 220kV for the high voltage cable, 330kV ~ 500kV for the ultrahigh voltage cable. . by one or more insulated conductive wire placed in the seal jacket in the composition of the insulated wire. Which can be added to protect the cover, used to transmit, distribute power or send electrical signals. It is the difference between ordinary wire and cable is the larger size, the structure is more complex.
