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.
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.