The reason why the insulation of the shielded sheathed wire is reduced turns out to be this:

Shielded and sheathed wire: If the connector is not qualified and the connector is made in a humid climate, the connector will enter water or be mixed with water vapor. After a long time, water branches will form under the action of the electric field, which will gradually damage the insulation strength of the cable and cause failure.

Chemical corrosion: In areas with acid and alkali effects, the outer sheath of the cable will be corroded, and it will suffer from chemical corrosion or electrolytic corrosion for a long time, resulting in the failure of the protective layer, the reduction of insulation, and the failure of the cable;

Long-term high overload operation: In long-term overload operation, excessive temperature will accelerate the aging of the insulation, resulting in insulation breakdown. Especially in hot summer, the temperature rise of the cable often causes the weak part of the cable insulation to be broken down first, so in summer, there are many cable failures.

Of course, the normal aging or natural disasters of the shielded sheath wire itself still exist, and it is necessary to pay attention to the inspection.

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