Seriously though, "cold shrink" is a misnomer, it doesn't really "shrink" per se, it is a tape that fuses with itself after installation to make an almost air-tight seal, but no heat is involved. It's a chemical fusion. And it doesn't really even TOTALLY fuse, but it is very very difficult to separate the layers after a while.
Raychem is now Tyco by the way.
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Actually, there are cold shrink cable terminations (made by mfrs such as 3M) that DO shrink on installation. They come "stretched out" on an inner sleeve that is stiff and spiral-split. You prepare the end of your cable to be terminated, slip the cold-shrink kit over it, and pull out the spiral sleeve, like thread or yarn pulling out of the inside of a skein. As the sleeve spirals out, the actual termination material shrinks down to its "unstretched" condition which is tight on the cable. It does have fusible characteristics, so it sticks to the cable, but yes, it does shrink. No external heat needed.
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Shrink terminations (heat or cold) are just a newer, quicker, and often more consistent and reliable method of electrical stress control at a change in insulation (splice or termination) of medium and high voltage cable insulation. Before the shrink materials, hand taping was the method used for stress control.
When the insulation changes shape (ends, for example), the electric field is distorted. When the distortion results in a severe voltage gradient, the possibility of electrical discharge, corona, flashover, and insulation damage increases. The stress control is designed to "smooth out" the voltage gradient over a longer distance.
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Shrink terminations and joints are a superior,user friendly,faster and long lasting method of providing cable connections up to 72 kV.
Raychem provides both Heat shrink and cold methods for jointing.
The modern day cables are having thinner insulation , basically xlpe and heat shrink method, being range taking, takes care of variation in dimensions and sizes.
Its a long lasting system designed to provide over 40 years of installed service.
cold shrink has a limitation of storage and the temperatures need to be maintained less than 43 degrees celsius. Further, cold shrink is surely a misnomer as these ary hybrid system deploying self fusing tapes and mastics to provide a tight seal whereas heat shrink uses hotmelt adhesives and sealants
Heat/Cold Shrink /Raychem
Re: Heat/Cold Shrink /Raychem
