Heat Shrink Cable Joint (HV) - 11kV Triplex BS7870 Cables

1. INSTALLATION INSTRUCTION
HEATSHRINK JOINT TO SUIT SINGLE CORE 6.35/11(12kV) XLPE/CWS
(TRIPLEX) NON ARMOURED CABLES
 THESE INSTRUCTIONS SHOULD BE FOLLOWED BY A TRAINED COMPETENT JOINTER
 A PROPANE GAS TORCH IS THE PREFERRED METHOD FOR SHRINKING THESE MATERIALS
 ENSURE THAT THE MATERIALS ARE KEPT CLEAN AND DRY AND ARE FREE FROM DUST, SAND AND GREASE
 PLEASE CALL SHRINK POLYMER SYSTEMS FOR ANY ADVICE
DATE OF ISSUE: 03.04.14

2. CABLE PREPARATION
SIZE
(mm2
)
DIMENSION
A
DIMENSION
X
MAX CONNECTOR
LENGTH
95-185 180mm 130mm
185-300 190mm 140mm
HALF LENGTH OF
CONNECTOR + 5mm
Fig 1
Table 1
2 2
Important:- If you have a cable size 185mm and your kit ranges from 95-185mm ,
2 2
prepare the cable to the 95-185mm range not the 185-300mm range
Cable Preparation
1. Ensure that the cables overlap before proceeding and the outer adhesive lined shrink tube is positioned over the cable end.
Copper Wire Screen
2. Bend back the wires onto the outer cable sheath, these will be bonded at a later stage. Expose the black semi-conductive screen
by 50mm (See Fig 1 and Table 1 for dimension A).
Black Extruded Semi-Conductive Screen Removal
3. Carefully remove the semi-conductive screen layer using a suitable tool. Avoid scoring and damage to the primary insulation
beneath. Note:- Screen removal tools are available and videos on screen removal feature on our website.
COPPER WIRES
TWISTED BACK
XX
A A
EXTRUDED SCREEN
PRIMARY INSULATION
5050

3. Mechanical or Compression
Type Connectors
STRESS CONTROL TUBE
STRESS CONTROL TUBE STRESS CONTROL TUBE
STRESS
CONTROL
TUBE
RED/BLACK
DUAL WALL
TUBE
Yellow Stress
Relief Mastic
10mm 10mm
4. Position the stress control and red/black dual
wall tubes over each core.
Stretch the yellow stress relief tape and apply over
the screen cut area, extending onto the primary
insulation and conductive screen by 10mm either
side as shown in Fig 2.
5. Now position the stress control tubes as shown
also in Fig 2, 5mm back from the end of the
insulation. Starting from the insulation end, apply
heat all around the tubes using a soft flame torch.
Heat until fully recovered.
6. Fit the approved MV ‘tapered’ connectors using
the appropriate tool. Clean and de-grease before
proceeding.
7. Apply the yellow stress relief mastic over the
connector area under tension and with a 50%
overlap. Extend onto the short stress control
tubes by 10mm, as shown in Fig 4.
Important:- Fill in the gap between primary
insulation and ensure a smooth taper to the
connector. Also if mechanical connectors used, fill
any voids that the bolts leave after they have been
sheared with the grey hv mastic tape supplied.
8. Stretch and apply the short red mastic tape
pieces over the stress control tubes as shown in
Fig 4, so that the red/black tubes sit upon it. This
will create an additional moisture seal.
9. Finally, centrally position the red/black dual wall
tubes so that they cover the screen end points.
Starting in the middle and working towards the
ends, shrink them whilst keeping the flame
moving all around the tubes to ensure an even
recovery and wall thickness.
Fig 2
Fig 3
5mm
Yellow Stress
Relief Mastic
STRESS CONTROL TUBE STRESS CONTROL TUBERED/BLACK
DUAL WALL
TUBE
10mm
Fig 4
RED/BLACK DUAL WALL TUBE
Fig 5

4. Fig 6
Copper Mesh
Bandage
Copper
Screen
Wires
10. Apply a layer of the tinned copper mesh
bandage with 50% overlap around the core
extending around the copper wire screens on both
sides.
Twist the copper screen wires together to form a
conductor and join together with a suitable
connector as shown in Fig 6. Apply a further layer
of copper mesh bandage around the joint and tie
off at each end. Apply some tape over any sharp
points. Note: try to position the connector at one
end of the joint where the overall diameter is
lower.
OUTER SHRINK TUBE
11. Clean, de-grease and abrade the outer cable sheaths. Position the outer adhesive lined shrink tube centrally over the joint gap.
Start shrinking from the centre to one end at a time. Keep the flame on the move to ensure an even wall thickness. The tube should
be wrinkle free and sealants should be visible at the ends.
12. Allow the completed joint to cool before applying any mechanical strain.
Important: user/circuit designer should determine whether or not special earthing requirements are needed to reduce the
possible effects of induced sheath voltages or circulating currents. The decision to single point earth/solid point earth or install
cross bonding kits needs to be considered once length of run, loading and positioning of cables is known.
Fig 7
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TEL: +44 (0) 1933 356758 FAX: +44 (0) 1933 413821 EMAIL: WEB:info@shrinkpolymersystems.co.uk www.shrinkpolymersystems.co.uk
IMPORTANT NOTICE TO PURCHASER:- Sellers and Manufacturere’s only obligation shall be to replace such quantity of the product proved to be defective. Neither the Seller nor
Manufacturer shall be liable for any injury, loss or damage, direct or consequential, arising out of the use or inability to use the product. Before using, User shall determine the
suitability of the product for his or her intended use and User assumes all risk and liability whatsoever in connection therewith.
Copper Screen Wires
Jointed with Connector