You will notice that in many places, bunch of cables have a protective covering on top in the form of tubing. The tubing should be such that no pressure should be inflected on the cables and they remain safe and protected. Therefore, the right size of the tubing should be chosen. Size of the tubing is understood by the ratio of the expanded size. In case there is a 3:1 ratio, it means that there is 1/3rd shrinkage of the tube, when compared to its original diameter. The same concept is applicable if the ratio is 2:1. There are different ratios in which heat shrink tubes are available. The most suitable ones are those which shrink to faintly smaller size of the cable you are applying to.
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