QHow to install the MV Power Cable?A1.The end user shall be required to carry out necessary field surveys and acquaint himself with the routing of all other service lines.
2.Cables shall be laid directly on ground on 10 cm minimum soft sand, and ground will be back filled properly avoiding any aggregate with sharp edges for damaging the cable insulation. End user shall provide 5 cm thick cement tiles above the back fill then HT marker for safety.
3.The cable ladder shall be bounded to ground at both ends.
4.All cables shall be marked with their respective cable numbers all along their routes at intervals not greater than 2.5 meters.
5.Spliced and joints on MV cables are not permitted.
6.Radius of cable bends shall be greater than 12 times the outside diameter of the cable.
QWhat are the requirements for the fire blocking of cable holes?AFor larger cable penetration holes, such as the cable penetration floor, etc., when using fireproof blocking materials to block, according to the actual situation, first coat four to six layers of fireproof paint on the cable surface, the length is about 1.5m below the hole, and then use fire-resistant The material is processed into a board-supporting fire-proof blocking material with a certain strength to ensure that it is firm after being blocked and is easy to disassemble and assemble when the cable is replaced. The plugging is dense and non-porous to effectively block smoke and fire.
QWhat are the insulating materials used to make cable terminal heads or intermediate joints?AThere are insulating glue, insulating tape, insulating tube, insulating gloves, insulating resin, etc.
QWhat are the conductor stranding methods of power cables？AThere are two twisting methods for the conductive cores of power cables: twist-free twisting and twist twisting.
The core twisted by the back-twisting method has no internal torsion stress, so it is mostly used for twisted wires that are not tightly compressed to avoid dispersing when the single wire is broken due to internal stress.
Twisting without back-twisting is mostly used for compacted cores, because the residual stress generated by self-twisting is elastic deformation, and the compaction is plastic deformation, so the internal stress can disappear after compacting.
QHow to connect copper core cables with different cross-sections?ACopper core cables with different cross-sections can be connected by open-back weak copper pipes and connected by soldering, or pure copper rods can be connected into copper pipes according to different cross-sectional requirements and connected by crimping.
QHow to measure the outer diameter of the cable sheath?AAt five evenly distributed points on the circumference of the sheath, measure the outer diameter of the sheath and its average value. The average outer diameter is the outer diameter of the sheath.