Why should single core cable be armored with aluminium tape?
Single core cable can only be used for single-phase power supply, so the flow number current will produce much flux, and the external metal parts except induction current, overheating.
Therefore, the aluminum sheath is used to allow magnetic flux to produce an induced current in the aluminum sheath, thereby substantially reducing the magnetic induction of the other external metal parts. The low resistance of the aluminum skin can reduce the heating induced by the induction current
The current flowing in the three-phase three core cable in magnetic field, they produce offset each other, only a few of the unbalanced current magnetic field generated by an electric current in the metal will be released, so the heating field is not too serious, can use the steel jacket.
