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Three important matters of attention to the construction of wire and cable

[Abstract]:
(1)becauseofthelargerouterdiameterofthewireandcable,itismoredifficulttotransportandlayup,andtherequirementsfortheturningradiusarealsostrict.Intheconstruction,iftheturningangleistoolarge,maycausetheint
(1) because of the larger outer diameter of the wire and cable, it is more difficult to transport and lay up, and the requirements for the turning radius are also strict. In the construction, if the turning angle is too large, may cause the internal conductor by mechanical damage, and mechanical damage will cause the insulation strength decreased, until the failure in the construction process, to minimize the torque by, in turn and let the left margin, in the natural bent, eliminate internal mechanical damage phenomenon.
(2) in common in medium and low voltage power cable net, the three-phase load is not equal, if using a metal shield, must consider the grounding of metal shield, and to ensure that at any point of the metal shield non normal induction voltage of the grounding of not more than 100V.
(3) in the construction of electric wire and cable, there are steel brackets, steel protection tubes, etc., all of which may form eddy currents in the surrounding closed loop of steel (iron), especially in large current power system. In construction, measures must be taken to make it impossible to form a steel (iron) closed loop to prevent the occurrence of eddy current.

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