What are the reasons for the failure of wire and cable?

The cable cable is abnormal, the main reasons are as follows:

1. Damage caused by external force: many common cable faults are caused by mechanical damage. For example: cable laying and assembly specification construction, easy to cause mechanical damage; Civil engineering on the directly buried cable is also easy to damage the cable during operation.

2 insulation layer moisture return: this thing is also very common, generally occurs at the cable interface in the directly buried or pipe groove. For example: the cable connection head is not made to pass and do the connection head in humid climate conditions, will make the connection head seepage or infiltration of water vapor, for a long time but under the action of electrostatic field to produce water tree technology, slowly harm the insulation strength of the cable and cause common faults.

3. Electrochemical corrosion: the cable is immediately buried in the area with strong acid and alkali effect, which often leads to the corrosion of the armored cable, tin pendant or outer protective layer. The protective layer is ineffective because of long-term electrochemical corrosion or electrolytic corrosion, resulting in the ineffective protective layer and the reduction of insulation layer, which will also lead to common cable faults.

4 long-term overload operation: overload operation, because of the thermal effect of the current, the load current according to the cable will inevitably lead to hot electric conductor, and the skin effect of free charge and the eddy current loss of steel armor, insulation medium consumption will also produce extra heat, so that the cable temperature rise. In long-term overload operation, high ambient temperature will accelerate the aging of the insulation layer, so that the insulation layer is damaged. Especially in hot summer, the temperature of the cable often causes the lack of cable insulation layer to be penetrated first.

5. Cable connector common faults: cable connector is a weak stage in the cable route, common faults of cable connector caused by the immediate fault of the staff (poor engineering construction) often occur. When the construction team is making the cable connection head, if the connection head is too loose and the heating is not in place, the original network will lead to the reduction of the insulation layer of the cable head, which will cause safety accidents.