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FAQs: Medium and High Voltage Cable Accessories (6.6kV – 145kV)

Terminations • Joints

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Answers to frequent questions about medium and high voltage cable accessories from 3M

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Medium Voltage Terminations 6.6 kV - 52 kV

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    • 3M Electrician unwinds core from 3M medium voltage termination
      • 3M™ Cold Shrink QT-II and QT-III Terminations function in a similar manner. They both employ 3M cold shrink technology which utilises a high-dielectric constant (Hi-K) stress control tube. The Cold Shrink QT-II employs a dielectric grade silicone grease in conjunction with the stress control tube while the Cold Shrink QT-III employs a conformable Hi-K stress controlling compound. The termination is made from a pre-stretched Hi-K stress control tube and a silicone rubber termination insulator body installed around a core. When the core is removed, the rubber provides a constant inward pressure on the cable, forming a seal which expands and contracts with variations in temperature and load, thereby creating a ‘living seal.’

        Discover more about 3M Terminations for Electrical Construction and Maintenance.

        Download brochure:

        3M Medium Voltage Cold Shrink Terminations Brochure (PDF, 866.19 KB)

      • The silicone rubber material used to make the Cold Shrink QT-III termination has better track-resistant properties than the Cold Shrink QT-II, while allowing for a much shorter design without sacrificing product performance. This is especially important when space is an issue as in cabinet placements. In addition, there are fewer steps involved when using a Cold Shrink QT-III termination so installation is simpler and generally quicker than the QT-ll termination.
  • All 3M™ Cold Shrink terminations are fully type tested, to Cenelec HD 629.1 / IEC 60502. Please contact us if you would like a copy of the type test report.
    • Illustration of an inverted medium voltage termination with 2 skirts facing down

      An inverted, skirted termination kit includes a non-skirted termination on one core and skirts on another core. The non-skirted termination is installed first and then the skirt assembly is installed on top of the non-skirted termination so that the skirts are oriented in the proper downward direction when the termination and cable are installed from the top direction versus the bottom direction, such as in a cabinet.

      Please contact us for more information, and help with product selection

  • Please contact us for more information, and help with product selection.

  • No, we offer silicone cold shrink terminations for medium voltage. 3M cold shrink technology utilises a high-dielectric constant (Hi-K) stress control tube and conformable Hi-K stress controlling compound. The pre-stretched rubber is wrapped around a core. When the core is removed, the rubber provides a constant inward pressure on the cable, forming a seal which expands and contracts with variations in temperature and load, forming a ‘living seal’. We do offer heat shrink products for low voltage (<1 kV) applications.

    Would you like to learn more about how cold shrink technology can help decrease installation time and provide better environmental sealing? Check out the Cold Shrink Revolution.

    Download brochure:
    3M Medium Voltage Termination Kit Brochure (PDF, 866.19 KB)


Medium Voltage Joints, 6.6 kV - 52 kV

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High Voltage Terminations, 72.5kV - 145kV

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High Voltage Joints, 72.5kV - 145kV

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