1. 3M™ Low Voltage Inline Cold Shrink Joints
3M Energy
  • 3M™ Low Voltage Inline Cold Shrink Joints

    April 23, 2014
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    • Our Cold Shrink low voltage joints utilises our tool free cold shrink technology where no heat is required for its application. Our cold shrink range is an effective alternative to traditional resin based methods and can be used in Indoor, Outdoor, Overhead, or use in Cable Trays.

      The Cold Shrink tube and copper wire sleeve are first positioned over the cable. The cable cores are then cut in such a way as to stagger the position of connectors. The cable insulation is then removed and connectors are installed. Most connectors can be used providing they suit the requirements of the cable and fit dimensionally within our joint. Scotch® 23 Self Amalgamating tape is used to over tape the connectors. Layers are applied tightly around each connector over lapping onto the primary insulation on each side of the connector position.

      A piece of cable jacketing that has been saved from the cable preparation is then wrapped around the connectors for added mechanical protection. Scotch® 2228 Mastic Tape is then used to seal the crutch of the cable. Scotch® 33 plus Premium insulation tape is applied across the length of the joint.

      The copper wire sleeve is then repositioned over the joint. It is then secured onto the armours with constant force springs. This provides a complete 360 degree earth screen around the joint for added protection. Scotch® 23 Self Amalgamating tape is used to over tape the constant force springs, ensuring its application is in the same direction as the constant force spring.

      Scotch® 2228 Mastic Tape is wrapped over the constant force springs to ensure a smooth profile and to achieve the required seal. The Cold Shrink protection tube is then positioned over the joint, the core is then removed by hand to install. The live memory action of the specially formulated material shrinks the protection tube into position and ensures a constant radial pressure and seal.