Heat Shrink Joint Kit – Installation

ADAPT3- Straight Through Jointing Kit

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Heat Shrink Jointing Kit - 11kV | Installation

Learn how to install Axis’s heat shrinkable jointing kits for 11kV Tape Shield 3-core XLPE Insulated Cables. This guide provides step-by-step instructions to ensure secure, durable connections using heat shrinkable components engineered for long-term performance. Ideal for both LV and MV cable applications, these straight through joint kits are suitable for use in industrial, utility, and outdoor environments, ensuring reliable power continuity and insulation integrity.
Axis straight through joint kits are designed to simplify installation while maintaining high mechanical strength and excellent electrical insulation performance.

Please thoroughly read and follow the steps in the installation instruction to avoid unnecessary loss! Make sure all the system is de-energized and fully grounded before installation. When cleaning, always start from core insulation cut towards semi-con screen. Never move back and forth.

Dimensions for Reference:

Voltage / kV Cross-section / mm² Oversheath removal A / mm Oversheath removal a / mm Overlapping semi-con. cut B / mm Semi-con screen layer removal C / mm Length of insulation removal L/mm
95mm2 185mm2 300mm2
6.35/11(12) 25-630 1100 500 20 260 35 63 70

      Note:

  • a: Length of anti-tracking insulation tube
  • D: Depth of lug barrel hole
  • C: Minimum dimension of core insulation exposed for limited installation space.

Steps for Installation

 

StepsDescriptionDiagram
1

Cable Sheath Preparation

  • Slide protective tube-1 and protective tube-2 over each cable end.
  • Trim the cable ends and overlap them by 50mm for proper jointing.
2

Cable sheath preparation

  • Remove the oversheath to dimensions A+25mm and a+25mm on each cable end.
  • Keep the armor and inner sheath intact as shown in Fig.2.
    • For tape-armored cable, follow the instructions in ① of Fig.2.
    • For wire-armored cable, refer to ② of Fig.2.
    • For non-armored cable, remove only the oversheath.
  • Overlap the cable cores to be jointed and mark a reference line at the center of the overlap.
  • Cut the cables at the reference line without forcing the cable cores apart when aligning.
3

Copper Shield and Semi-Con Screen Treatment

  • Keep the copper tape and semi-con screen intact as shown in Fig.3.
  • Bevel the edge of the semi-con screen to ensure a smooth transition to the core insulation.
  • Remove the core insulation following dimension L.
  • Bevel the core insulation for 30mm and leave 5mm of the inner semi-con layer as shown in Fig.3.
4

Applying Stress Relief Mastics and Installing Stress Control Tube

  • Scrape and clean the surface of the core insulation.
  • Wrap stress relief mastic, overlapping 5mm onto both the semi-con screen and the core insulation.
  • Apply a thin layer of lubricating grease to the core insulation where the stress control tube will be placed.
  • Position the stress control tube over the core insulation and shrink it, ensuring it overlaps the outer semi-con screen by dimension B.
5

Placing Tubes Over Cable Ends

  • Slip the copper mesh onto one end of the cable.
  • Slide the set of tubes onto the other cable end in this order:
    1. First, place insulation tube-1.
    2. Next, slide on insulation tube-2.
    3. Finally, add the semi-conductive tube.

Follow Fig.5 for reference. Let me know if you’d like further simplifications!

6

Installing the Connector

  • Insert the conductors into the connector and secure them properly.
  • Smooth out any sharp edges and clean off any residues.
  • Fill the bolt holes with semi-conductive tape to create a smooth surface.
  • Stretch the semi-conductive tape and wrap it around the connector with a half-overlap, continuing onto the conductor screen.
  • Press the end of the semi-conductive tape firmly for 5 seconds to ensure it stays in place.
7

Preparations Pre- Installing for Insulation Tubes

  • Apply filling mastic over the semi-conductive tape and onto the tapers. Ensure the mastic is wrapped to match the level of the original insulation.
  • Clean the surface of the core insulation thoroughly.
  • Wrap stress relief mastic at the connection between the stress control tube and the core insulation, overlapping both the stress control tube and insulation by 5mm.
  • Apply a thin layer of lubricating grease over the stress control tube, core insulation, and the connector area.
  • Avoid getting grease on the semi-conductive screen.
8

Installing Insulation Tube-1 and Tube-2

  • Place insulation tube-1 so it is centered over the connector area.
  • Shrink the tube starting at the center and working towards the ends.
  • Position insulation tube-2 over insulation tube-1, centering it properly.
  • Shrink insulation tube-2 in the same manner, starting at the center and moving outward.
9

Wrapping Sealing Mastics

  • Wrap sealing mastics around the copper shield cut.
  • Continue wrapping the mastics onto the end of insulation tube-2 to ensure a secure seal.
10

Installing the Semi-Conductive Tube

  • Align the semi-conductive tube so it is centered over the joint area.
  • Begin shrinking the tube from the center and work towards the ends.
  • Wrap semi-conductive tape around both ends of the semi-conductive tube, extending 10mm onto the tube and 10mm onto the copper shield to ensure a secure connection.
11

Installing Copper Mesh and Earth Wire

  • Scrape the copper shield to prepare it for connection.
  • Attach the copper mesh and earth wire to the copper shield using constant force springs as shown in the diagram.
  • Cover the constant force springs with vinyl tape to protect against sharp edges and burrs.

Note: Leave 10-20mm of the earth wire free and wrap one layer of the constant force spring over it. Bend back the reserved portion and continue wrapping the remaining spring to secure the earth wire.

12

Inner Sheath Rebuilding (Skip for Non-Armored Cable)

  • Fill the gaps between the cable cores using clean cable filler and bind the three cores together.
  • Scrape and clean the surface of the inner sheath.
  • Wrap sealing mastic around the inner sheath to create a moisture barrier. The barrier should be 20mm wide and 1-2mm thick.
  • Place the first protective tube-1 over one inner sheath, ensuring it overlaps the inner sheath, and shrink it into place.
  • Wrap sealing mastic around the end of the shrunk tube to reinforce the overlap.
  • Position the second protective tube-1 over the other inner sheath, overlap it, and shrink it as well.

Note: Ensure all overlapping areas are cleaned, abraded, and wrapped with sealing mastic for proper sealing.

13

Securing Armor Earth Wire (Skip for Non-Armored Cable)

  • Scrape the armor surface to prepare it for connection.
  • Attach the armor earth wire to the armor using constant force springs, with two springs used on each side for wires.
  • Cover the constant force springs with vinyl tape to protect against sharp edges and burrs.

Note: Leave 10-20mm of the earth wire free and wrap one layer of the constant force spring over it. Bend back the reserved portion and continue wrapping the remaining spring to firmly secure the earth wire.

14

Oversheath Rebuilding

  • Scrape the oversheath on both sides for 100mm and wrap sealing mastic around each oversheath to create a moisture barrier. The barrier should be 20mm wide and 1-2mm thick.
  • Place the first protective tube-2 over one side, overlapping the oversheath by 100mm.
  • Shrink the tube into place, starting from the center and working towards the ends.
  • Wrap sealing mastic around the end of the shrunk tube to reinforce the overlap.
  • Position the second protective tube-2 over the other side, overlapping the oversheath by 100mm.
  • Shrink the tube starting from the center and working towards the ends.
  • Termination is now completed.

Note: Ensure all overlapping areas are cleaned, abraded, and wrapped with sealing mastic. 

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Step No. Description Diagram
1 Cable sheath preparation
• Remove oversheath by dimension A (see the chart above).
• For tape armored cable, reserve armor and inner sheath as per Fig.1.
• For wire-armored cable, reserve armor and inner sheath as per Fig.1.
• Non-armored cable: Remove oversheath only.
• Wrap a piece of sealing mastic 10mm from the oversheath cut for 200mm if any.
1 Cable sheath preparation
• Remove oversheath by dimension A (see the chart above).
• For tape armored cable, reserve armor and inner sheath as per Fig.1.
• For wire-armored cable, reserve armor and inner sheath as per Fig.1.
• Non-armored cable: Remove oversheath only.
• Wrap a piece of sealing mastic 10mm from the oversheath cut for 200mm if any.

    Packing List
    No.ItemLength / mmUnitQtyRemarks
    1Stress control tube80pc6
    2Insulation tube-1560pc3
    3Insulation tube-2540pc3
    4Semi-conductive tube620pc3
    5Protective tube-1850pc2With Adhesive
    6Protective tube-21000pc2With Adhesive; ≥500mm²: 4 pcs
    7Semi-conductive tape box1≥500mm²: 2 boxes
    8Lubricating grease bag1
    9Filling/Sealing mastics bag1
    10Stress relief mastics bag2
    11Connector for conductor
    continuity
    pc3Optional
    12Earth wire pc3-4Per cable structure
    13Copper mesh pc3
    14Triangle insert pc2
    15Sand paper pc1≥500mm²: 2 pc
    16Cleaning tissue bag1≥500mm²: 12 bags
    17Gloves pair1
    18Solderless kit -Constant force spring pc6-10Per cable structure
    Vinyl tape roll1
    19Installation instruction pc1With packing list
    Packing List
    No.ItemLength / mmUnitQtyRemarks
    1Stress control tube80pc6
    2Insulation tube-1560pc3
    3Insulation tube-2540pc3
    4Semi-conductive tube620pc3
    5Protective tube-1850pc2With Adhesive
    6Protective tube-21000pc2With Adhesive; ≥500mm²: 4 pcs
    7Semi-conductive tape box1≥500mm²: 2 boxes
    8Lubricating grease bag1
    9Filling/Sealing mastics bag1
    10Stress relief mastics bag2
    11Connector for conductor
    continuity
    pc3Optional
    12Earth wire pc3-4Per cable structure
    13Copper mesh pc3
    14Triangle insert pc2
    15Sand paper pc1≥500mm²: 2 pc
    16Cleaning tissue bag1≥500mm²: 12 bags
    17Gloves pair1
    18Solderless kit -Constant force spring pc6-10Per cable structure
    Vinyl tape roll1
    19Installation instruction pc1With packing list
    Installation Instruction

    Installation Instruction:

    1. Select the corresponding mechanical lug according to the information in the table and determine whether to retain the insert.
    2. Prepare the installation tools. Ensure that the conductor end has a straight (right-angle) cut. Strip the cable insulation by the required length.
    3. Remove the oxide layer on the conductor surface with a wire brush. Cleaned conductor should be installed into connector immediately. Then rotate the connector so that the jointing compound in the connector is evenly coated on the conductor surface. If use sector cable, install it in the direction as shown. (Refer to Figure 1)
    4. Install the conductor into the bottom of the barrel, hand-tighten the bolts to pre-tighten the conductor.
    5. Tighten the bolts in sequence using a wrench, turning one bolt at a time. Repeat until the shear head breaks. (Installation sequence: 1 → 2 → 3 → 4, see Figure 1)
    6. Smooth sharp edges of protruding bolts with the provided file .

    FAQ

    A straight through joint kit is designed for joining high-voltage power cables (11 kV to 33 kV), ensuring electrical continuity, insulation, and mechanical protection. It’s commonly used in underground or ducted cable installations

    The kit includes:

    Stress control tubing & mastic

    Heat shrink insulation and adhesive sealing tubes

    Copper mesh for metallic shielding

    Earth connection accessories (soldered/solderless)
    These components ensure smooth electric field control and moisture protection

    Copper mesh is wrapped around the joint area to restore the cable’s metallic screen. It allows for grounding and shielding, ensuring safe performance of the joint. Both soldered and solderless earth options are available

    Yes, kits are available for both single-core and triple-core cables, with cross-sections ranging from 35 mm² to 1200 mm², and voltages from 11 kV to 33 kV. The kits are tailored for various configurations

    An adhesive-coated outer heat shrink tube provides moisture sealing and mechanical strength, mimicking the original oversheath of the cable. This ensures chemical resistance and long-term durability