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

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

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  INSTALLATION INSTRUCTION HEATSHRINK JOINTTO 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
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  CABLE PREPARATION SIZE (mm2 ) DIMENSION A DIMENSION X MAX CONNECTOR LENGTH 95-185180mm 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
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  Mechanical or Compression TypeConnectors 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
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  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 UNITS E3 CROWN WAY CROWN PARK INDUSTRIAL ESTATE RUSHDEN NORTHANTS NN10 6FD TEL: +44 (0) 1933 356758 FAX: +44 (0) 1933 413821 EMAIL: WEB:[email protected] 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