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How to use a cold-joint straight-through type

Cold-shrink straight-through joints are installed by preparing the cable, positioning the pre-expanded silicone joint, and gradually removing the holdout tube to allow the joint to shrink securely onto the cable.Overview

Cold-shrink straight-through joints are used to connect two medium-voltage cables in a straight line, maintaining electrical insulation and mechanical protection. They are pre-expanded silicone rubber bodies mounted on a removable plastic or spiral holdout tube, which allows for tool-free installation and consistent radial pressure on the cable . These joints are compatible with specific connectors from the same manufacturer and are designed for indoor, outdoor, underground, or submerged applications .

Step-by-Step Installation
  1. Cable Preparation
    • Strip the cable insulation, semi-conductive layers, and shielding according to the joint manufacturer's instructions.
    • Ensure the conductor ends are clean and free of oxidation.
    • Measure and mark the correct lengths for the joint body and connectors.
  2. Connector Installation
    • Attach the mechanical or compression connectors to the cable cores.
    • Ensure a secure and electrically sound connection, as cold-shrink joints rely on proper conductor contact .
  3. Positioning the Cold-Shrink Joint
    • Slide the pre-expanded silicone joint over the prepared cable ends while it is still on the holdout tube.
    • Align the stress cones and conductive layers with the cable shielding and connectors to ensure proper electrical stress control .
  4. Removing the Holdout Tube
    • Gradually pull the holdout tube out, allowing the silicone body to shrink tightly around the cable.
    • Ensure the joint body fully covers the connectors and cable insulation, forming a continuous seal .
  5. Final Inspection and Securing
    • Check that the joint is evenly seated with no gaps or voids.
    • Apply any additional mastic, tape, or overwrap if recommended by the manufacturer for extra moisture protection .
    • Verify that the joint is mechanically stable and electrically insulated before energizing the system.
Advantages of Cold-Shrink Joints
  • Tool-free installation reduces labor and risk of errors.
  • Consistent radial pressure ensures long-term insulation and moisture resistance.
  • High dielectric strength and low-temperature recovery make them suitable for harsh environments .
  • Can be used in limited or difficult work conditions where heat-shrink or cast-resin joints are impractical .
Safety Considerations
  • Always follow manufacturer-specific instructions for cable preparation and joint installation.
  • Ensure the joint is compatible with the cable type and connector brand.
  • Wear appropriate personal protective equipment (PPE) when working with medium-voltage cables.
  • Test the joint for insulation integrity before energizing the system. By following these steps, a cold-shrink straight-through joint can be installed efficiently, providing a reliable, long-lasting connection for medium-voltage cable systems .
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