Increasing Use of Laminated Copper sheaths in MV, HV Cables

In both medium voltage (MV) and high voltage (HV) cables, a 0.15 mm (6 mils) thick copper coated (on one side) laminate sheath can be used as a moisture and chemical barrier over the cable core. The copper sheaths offer a viable alternative to other metallic sheaths, for instance, lead and pipe type cable with oil-filled paper insulation, and are gaining increased acceptance.

The benefits of coated copper laminate sheaths, like ZETABON™ coated metal sheeting from Dow Wire & Cable, compared to coated aluminum, include:

  • Improved corrosion resistance
  • Ease of termination
  • Reduced thickness of shield
  • Higher fault current capacity
  • Combined functions as shield/moisture barrier
Coated Copper Tape for Power Cable

Coated copper tape for power cable applications

In the cable manufacturing process, the coated copper tape is folded longitudinally over the cable core, sealed with a hot melt adhesive at the overlap and bonded to the extruded cable jacket. The combination of the bonded jacket and sealed seam acts as a metal-lined plastic pipe with excellent protection from chemical and moisture ingress. Data shows that MV and HV cable designs with laminated copper sheaths offer excellent reliability and ease of installation.

A presentation by Dow Wire & Cable at the Spring ICC Meeting outlined these additional mechanical property improvements:

  • Tighter bend around smaller mandrels
  • Higher side wall pressure during installation
  • Improved resistance to crush, impact, puncture, buckling and thermal cycling
  • Improved jacket shrinkback

To request a full copy of the presentation, please send an e-mail to dowpoint@dow.com.


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