QWhat are the regulations for cable protection tubes?A(1) When the cable needs to be laid through a protective pipe, the inner diameter of the pipe should not be less than 1.5 times the outer diameter of the cable, and the inner diameter of the concrete pipe, clay pipe, asbestos, and cement pipe should not be less than 100mm;
(2) The bending radius of the cable tube should meet the requirements of the bending radius of the cable inserted;
(3) Each pipe should not exceed three elbows at most, and there should be no more than two right-angle bends.
QWhat is the difference between STA and SWA Armor?ASteel Tape Armor(STA) is only used for laying of directly buried cables or ordinary pipes, ordinary ground, tunnels, etc. The Steel Wire Armor(SWA) can withstand general longitudinal tension, so it is suitable for short-distance overhead laying or vertical laying.
QWhat are the main properties of the insulation material of the power cable?A(1) High breakdown strength;
(2) Low dielectric loss;
(3) Very high insulation resistance;
(4) Excellent discharge resistance;
(5) It has certain flexibility and mechanical strength;
(6) Long-term insulation performance is stable.
QWhat makes electrical cables available for outdoor use?APlacing the cables in metal conduit, plastic ducting, or where directly buried, through steel wire armouring can protection from direct sunlight or other external influences.Cables for external use have been designed to survive the adverse conditions in the outdoor environment.
The outer layers of the cable must serve to protect the cable from external influences such as mechanical damage, water, extremes of temperatures, rodent or insect attack, UV exposure from sunlight, and ozone in the atmosphere.
QWhy the prices of cable fluctuate?AThe main component of cable is copper and aluminum. Whatever copper or aluminum is a commodity which is traded on the open market, just like gold or silver. Prices of copper and aluminum rise and fall with supply and demand.
QWhat are the benefits of PE insulated cables?APolyethylene is an ideal insulating material and can be used for telephone and high speed transmission, high frequency signal and control cable, low, medium and high voltage power cables, overhead line wire and service drop cables.
Polyethylene is a semi-crystalline polymer in many forms, with different chemical structures, molecular weights and densities determined by various polymerization methods. Has excellent dielectric properties-high dielectric strength, low dielectric constant and low loss factor at all frequencies.
Although PE naturally has poor fire resistance, it can be significantly improved by adding fillers (halogenated or halogen-free). PE can also be mixed to include additives that enhance other properties (such as resistance to sunlight, weather resistance, and chemical degradation). PE is a hard and wear-resistant material, which makes it useful as a sheath material in various applications, but when a more flexible material is required, adding a small amount of butyl rubber or ethylene propylene rubber (EPR) can Improve flexibility. The toughness of PE also makes it suitable for direct burial in the ground.
This temperature range is usually -65°C to +75°C, but cross-linked polyethylene (to make XLPE) can extend this temperature range to +90°C.