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Installation of 8.7/15KV Heat Shrink Cable Joint
Apr 15, 2026
1. Preparatory Work
a.The installation site should be free from dust, dry and ventilated.
b.Check whether installation tools are complete.
c.Check whether cable accessories match the cable correctly.
d.Straighten and saw the two ends of the two cables to be connected evenly.
2. Stripping
a.Strip off the outer sheath in sequence: 600mm for the long end and 400mm for the short end; leave 40mm of steel armor at both ends and strip off the rest, leave 40mm of inner sheath at both ends and strip off the rest; remove the filler (reserved for use) and separate the three phases.
b.After measuring 220mm, strip off the copper shield and fix it with PVC tape. Keep 40mm of the semi-conductive layer and strip off the rest; be careful not to damage the insulation layer when stripping the semi-conductive layer.
c.Polish the surface of the remaining steel armor and clean the outer sheath.
d.Polish the outer sheath and inner sheath.
e.Cut off the insulation layer according to 1/2 the length of the connecting pipe plus 5mm. Measure 35mm at the end of the insulation layer, cut it into a 30mm-long cone, and retain 5mm of the inner semi-conductive layer.
3. Fix Stress Pipe
a.Cut the end of the outer semi-conductive layer into a cone shape. Polish the surface of the insulation layer with fine sandpaper, being careful not to polish the semi-conductive layer, remove residual semi-conductive particles, and clean the main insulation layer.
b.Slide the stress tube over to overlap the outer semi-conductive layer by 20mm and heat it to shrink and fix.
c.Slide the pipes and copper mesh in sequence, slide the protective sleeves onto both ends of the cable respectively; on the long end of the cable, slide one set of inner and outer red insulation tubes and inner and outer black semi-conductive tubes onto each phase respectively, and slide the copper mesh onto each phase of the short end of the cable respectively.
4. Install Connecting Pipe
a.Slide the connecting pipe over and crimp it; when crimping, crimp from the middle of the connecting pipe to both ends.
b.After crimping, file down the edges, corners and burrs on the connecting pipe and clean it.
c.Wrap semi-conductive tape around the connecting pipe, overlapping 5mm of the inner semi-conductive layer on each side.
d.Wrap filler tape and insulating self-adhesive tape on the semi-conductive tape to make a smooth transition between the connecting pipe and the main insulation, overlapping 10mm with the main insulation layer at both ends.
5. Install Heat Shrink Insulation Tube and Shielding Treatment
a.Clean the outer surfaces of the insulation layer and the stress tube with cleaning paper.
b.Place the three inner insulation tubes at the center of the connecting pipe, heat and shrink from the middle to both ends. Then place the three outer insulation tubes at the center of the inner insulation tubes, heat and shrink from the middle to both ends.
c.Wrap sealant around the end face of the outer insulation tube from the copper shield port to fill the gap and wrap it into a cone shape.
d.Place the semi-conductive tube at the center of the outer insulation tube, heat and shrink. Wrap semi-conductive tape around the overlapping area between the copper shield and the semi-conductive tube for 5mm.
e.Stretch the copper mesh to cover the semi-conductive tube, overlap both ends on the cable's copper shield, and fix it with insulating tape.
6. Sealing Treatment
a.Arrange the three phases together, restore the filler, and fix it with PVC tape.
b.Connect the steel armor at both ends of the cable with a grounding wire and fix it with a constant force spring.
c.Fix the constant force spring with PVC tape and wrap filler tape around the constant force spring and the outer sheath to fill the gap.
d.Wrap sealant 30mm from the outer sheath and inner sheath at both ends of the cable.
e.Clean the sheaths at both ends and preheat them. Pull the protective sleeve from the long end, place it on the sealant and heat it to shrink until a small amount of hot melt adhesive oozes out; clean the right end of the shrunk protective sleeve, pull the protective sleeve from the short end, overlap it with the shrunk protective sleeve, and treat it the same as the long end. Wrap self-adhesive tape around the overlapping parts at both ends and the middle of the protective sleeves to enhance sealing.
f.After the joint installation is completed and fully cooled, clean the surface carbon black with a cleaning agent and start testing and operatio
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