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  5. 3M Scotchcast Hazardous Area Low Voltage Inline Resin Joint
3M Energy
  • 3M Scotchcast Hazardous Area Low Voltage Inline Resin Joint

    April 23, 2014
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    • 3M™ Scotchcast™ Hazard Area LV Resin Joints are flame retardant, halogen free, and virtually unaffected by immersion in either hydro-carbons or chemical solvents. Our design is based around a high quality BS EN 50393 compliant product, conventional re-insulation techniques using self amalgamating tapes, and specialist resin encapsulation. 3M™ have been supplying cable accessories and resin for use in hazardous areas for in excess of 25 years and have carried out extensive research into the effects of hydro-carbons and chemical solvents on resin encapsulates.

      Scotch® 23 Self Amalgamating tape is used to seal the crotch of the cable. Scotch® 2228 Mastic Tape is applied over the inner sheath finishing 5mm onto the lead sheath. The copper wire sleeve is positioned over the cable.

      The insulation is then removed and connectors are installed. A number of our kits come complete with connectors for ease of selection. However any connector can be used providing they suit the requirements of the cable and fit dimensionally within our joint.

      Scotch®™ 23 Self Amalgamating tape is used to over tape the connectors. Layers are applied tightly around each connector over lapping onto the primary insulation on each side of the connector position. For cables up to 1kV, 2 half lap layers are applied and for unscreened 3.3kV cables, this is increase to 5 layers.

      Each connector is then covered with a Spiral Spacer to ensure we achieve the correct separation distance between the phase cores. This is to ensure the correct volume of resin is present between the cores. The copper wire sleeve is then repositioned over the joint and fixed in place with constant force springs. This provides a complete 360 degree earth screen around the joint for added protection in a hazardous environment.

      Scotch® 23 Self Amalgamating tape is used to over tape the constant force springs. Ensure it is applied in the same direction as the constant force spring. Scotch® 2228 Mastic Tape is wrapped over the constant force springs and cable jacket. The cable sheath is then abraded to remove any contaminants to ensure the resin bonds to the cable jacket.

      The hazardous area joint shell utilises a traditional two part mould shell that requires the cutting of the stepped ends to fit the required cable diameter. This specialised joint shell is flame retardant, hydrocarbon resistant, and halogen free. Scotch® 23 Self Amalgamating tape is used to seal the conical ends of the mould to the cable sheath we have re-developed our resin compounds to comply with EU environmental and user safety regulation changes, and are all REACH & ROHS compliant.

      3M™ 1402FR high quality, highly modified polyurethane resin, demonstrates superior performance above all our other resin types. It is for this reason that 1402FR resin is supplied in the range of 3M™ hazardous area cable joints covering instrumentation, control cables and power cables rated up to 3.3kV. This resin is also used in hazardous area medium voltage cable joints up to and including 11kV.When pouring the resin into the mould ensure the gloves provided are worn to avoid potential skin contact.