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Advantages and disadvantages of cold shrink and prefabricated cable accessories

Tue Dec 07 16:37:12 CST 2021

Cold-shrink cable accessories


The applicable surface is wide, large surplus fit, few product specifications, one specification for two or more square cable; always maintain appropriate radial pressure to the cable body after installation, the interface pressure ambassador close interface, will not cause electric breakdown due to the breathing action of cable operation, attachment internal layer removal danger of moving or bending after installation;

The installation operation is simple, need not fire, save time and effort, to solve the prefabricated cable accessories contraction is not tight or can not fit in the phenomenon.Good sealing, good safety in high humid and high salt fog environment.


Due to the additional expansion process and the need of expansion and contraction characteristics, the cold shrink cable accessories have a much higher performance than the prefabricated silicone rubber (such as tensile strength and tear resistance), so that the production cost is somewhat higher than the prefabricated accessories;

The storage period is short, generally is half a year to two years because the cold shrink cable accessories is pre-expanded, in the case of support bars for a long time storage, there may be scattered bars or silicone rubber material fatigue contraction is not in place;

Compared to the prefabricated type, the cold shrink cable attachment installation is higher for the installation workers, the installation is more complicated.

Preformed cable accessories


Because the need of pre-expansion makes the production process is relatively cold shrinkage type simple, high production rate; the volume is small, the installation process is simple installation operation, and no fire, time and effort saving, greatly reduce the quality accidents caused by improper operation, the possibility of installation error is low;


Due to the limitations of the prefabricated process bring a series of problems, the inner diameter of the prefabricated terminal is only slightly less than the outer diameter of the cable insulation layer, the small radial pressure on the cable and the cable is not obvious, the sealing is relatively weak, leading to the possibility of internal climbing penetration. Compared with the cold shrink cable accessories due to the dislocation of the mobile cable.

To sum up, cold shrink and prefabricated have its own advantages and disadvantages, comprehensive performance is better cold shrink, cold shrink cable accessories generally use high performance liquid silicone production, Dow Corning imported liquid silicone is the best, cold shrink cable accessories using solid silicone production performance is much poor, aging, easy to crack, contraction is not tight phenomenon, the use of solid silicone production of cold shrink attachment advantages will soon disappear.So the cold shrink type and prefabricated type had the best use of liquid silicone production.