There are many different types of cables on the cable tray, such as: 1. High-voltage power cable (hundreds of volts to .000 volts) 2. Low-voltage power cable (220V-380V) 3. Low-voltage electrical (control) cable (24V) 4 (Such as fiber, cable, etc.) 6. Ground cable I think the reason why the high-voltage cable on the top, because taking into account: the fire, reduce the risk of burning control cable, communication cable. But I do not know how the following cables are Such as control cables and communication cables can be arranged together? Will the grounding cable be at the bottom or below the power cable? Look advise! Question added: we can talk about why should the ground on the bottom of it? Not from the rules that, from the principle that! More
Four-layer cable bridge: high-voltage power, low-voltage power, control cables, communications and computer cables, ground into the bottom layer. High-voltage cable load, easy to produce high temperature. If laying in the lower, will have a great impact on the above low-voltage cable, the best on the upper, there is a little, high-voltage cables are generally steel armor layer, high mechanical strength, even without steel armor due to insulation Thick, bear the impact of the general object is also strong, for cable protection has some advantages. Cable safety requirements: . the cable cross each other, the high-voltage cable should be below the low-voltage cable. If one of the cables is in the range of 1 m before and after the cross-pipe protection or partitioning, the minimum allowable distance is 0.25 m. . when the cable and thermal pipe close or cross, if the insulation measures, parallel and cross the minimum distance of 0.5m and 0.25m. . cable and railway or road crossing should wear protection, protection tube should be out of the track or road 2m outside. . the distance between the cable and the building foundation, should be able to ensure that the cable buried in the building outside the water; cable into the building should wear protection, protection tube should be beyond the building outside the water. . directly buried in the underground cable and the grounding of the grounding device should be separated between 0.25 ~ 0.5m; buried directly in the underground cable buried depth, generally should not be less than 0.7m, and should be buried in the frozen soil layer.
Mainly refers to the key raw materials that PVC and copper models, suppliers should be consistent with the application when the report, marking the requirements and consistent with the application for approval of the application. Applicant, manufacturer, manufacturer and address are the same as those of the application and are consistent with the business license. The actual name and address are the same. For this structure, the wire and other products are different, as long as the structure of the wire meet the standard requirements (such as the declaration of RVV0.75 when 24 conductors, and later turned into 32 conductors, generally do not do inconsistent treatment), generally considered consistent Qualified. Process as long as the process requirements meet the standard requirements to produce products that meet the requirements of the standard can be.
Whether your production equipment, production process, raw material use, finished product performance and the application of the sample production equipment to provide the same process materials
Consistency is what you write, the provisions of how to do, and you do, with the same, that is, product consistency confirmation, such as your cable used in the provisions of the copper specifications is how much, with which supply Business, in the time of the report is what kind of, when you do to confirm the time to correspond to the time of the report.
