Underground Cable Accessories

The low-voltage network is essential for ensuring reliable, safe, and efficient energy distribution, delivering power to homes, businesses, and small industrial sites. As it is primarily located in urban areas, using underground cables offers a secure solution that helps reduce faults and enhances the stability of the electrical network.

Ensto provides a wide range of underground cable accessories for low voltage distribution networks, including complete, high-quality product packages  for jointing and terminating low voltage cables up to 1 kV. 

Cable Joints

Low voltage cable joints are available for various types of polymeric and paper insulated cables used in the network. The product offering includes different types of range taking heat shrink straight joints and transition joints for cables ranging from 1.5 to 300 mm2. 

Heat shrink joints include heavy wall heat shrink tubing for both insulation and outer sheaths, and include all necessary components required for high-quality jointing. Product options for common cable types are available both with and without shear bolt connectors.

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Cable Terminations

Low voltage cable terminations are available for various types of polymeric and paper insulated cables used in the network. The product offering includes different types of range taking heat shrink indoor and outdoor terminations for cables ranging from 6 to 300 mm2. 

Heat shrink terminations include heat shrink breakouts and heat shrink tubing for core protection and phase marking, and include all necessary components required for high-quality assembly. Product options for common cable types are available both with and without shear bolt lugs.

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The medium-voltage network transfers electricity across extended distances between the high-voltage network and the low-voltage network. This process requires a significant number of underground cables and cable accessories to secure reliable, safe, and efficient energy distribution. 

Ensto provides high-quality and safe medium voltage cable accessories designed with a minimal number of components, facilitating faster installation thanks to the reduced number of steps required.

Cable Joint Accessories

A wide range of medium voltage cable joints are available in heat shrink, cold shrink or hybrid versions for various types of polymeric and paper insulated cables. The product offering includes different types of straight joints, transition joints and sheath break joints for voltages up to 42 kV and cable cross-sections ranging from 10 to 1000 mm².

The heat shrink joints kits use different types of heat shrink polyolefin tubing for all stress control, insulating and outer sheath layers.

The cold shrink joints use elastic silicone with all stress control components included in a single piece joint body and are loaded on spiral ribbons for easy installation. Cold shrink joints are available with outer sheath tubes loaded on separate spiral ribbons and as very compact “All-in-One” joints, which have the outer sheath tube pre-assembled on top of the joint body for a fast and easy installation.

Hybrid joints combine the main benefits of heat shrink and cold shrink technologies with their spiral loaded cold shrink joint bodies for fast and easy installation and the versatile and robust external finish of heat shrink outer sheath tubes.

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Cable Termination Accessories

Ensto offers a wide range of medium voltage cable terminations that are available in heat shrink, cold shrink or hybrid versions for various types of polymeric and paper insulated cables. The product offering includes different types of range of indoor and outdoor terminations for voltages up to 42 kV and cable cross-sections ranging from 10 to 1000 mm2.

The heat shrink termination kits use heat shrink polyolefin tubing for stress control and anti-tracking insulation layers. Heat shrink breakouts in 3-core terminations are available as either conducting or insulating versions for different applications.

Cold shrink terminations use elastic anti-tracking silicone with stress control components and rain sheds all included into a single piece termination body. The termination bodies are loaded on spiral ribbons for easy and safe installation.

Hybrid terminations are available for 3-core cables where the main benefits of heat shrink and cold shrink technology are combined by using spiral loaded cold shrink termination bodies for faster installation and heat shrink breakouts and heat shrink core protection tubes for tougher external protection.

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Screened Separable Connectors

Separable connectors are used for connecting cables directly into switchgear and transformers which use standardized interphase bushings. Ensto’s selection of screened separable connectors includes elbow and straight connectors for 250 A Type A bushings and T-connectors, back connectors, and surge arresters for 630 A Type C bushing connections for voltages up to 24 kV. The product offering includes accessory kits for common types of 1-core and 3-core polymeric cables with cross-sections ranging from 10 to 300 mm2.

The connectors are touch-safe, free of maintenance and suitable for both indoor and outdoor use. Elastic silicone as a raw material guarantees wide areas of use and convenient installation even in the tightest sites without hot works or hot work permits.

All accessory kits are delivered with all necessary components conveniently packed together, which streamlines the installation process and saves time. This comprehensive approach improves both reliability and user experience.

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A prominent part of the underground cable accessories are the connectors at the joints and lugs at the terminations.  Ensto’s cable connectors and lugs have been designed to make installation as easy and effortless as possible. All cable connectors and cable lugs are equipped with shear-head bolts, which guarantee a reliable and uniform installation without the need for special tools.

Connectors and Lugs for Low Voltage

The comprehensive range of mechanical connectors and lugs for low voltage cables covers a wide range of commonly used cross-sections between 6 to 300 mm². The connectors and lugs  can be used on  cables with both aluminum and copper conductors up to  1 kV and are suitable for solid, stranded, sector and round conductors.

Thanks to the shear-head bolt construction no compression tools are needed. The required force is achieved by tightening the bolt until it breaks off  All connectors and lugs are longitudinally watertight. 

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Connectors and Lugs for Medium Voltage

Ensto’s  medium voltage connector and lug offering covers a wide cross-section range from 10 mm² to 800 mm².  The connectors and lugs can be used on cables with aluminum and copper conductors up to 42 kV and are suitable for solid, stranded, sector and round conductors.

The connectors and lugs have a screw design with stepless shearing – the screw always breaks at the correct point during installation at the surface level. This is important because underground cable installations are often made under very challenging conditions.

The electrical properties of the shapes are optimized by simulations – the effect of the electric field is minimized at each location and there are no sharp edges at all. One of the newest features is a connectors' semi-conductive cap, which makes the connector installation faster and it is not needed to add mastic in the screw holes.

The products are type tested according to the newest standards requirements in Ensto's own accredited laboratory, which ensures high quality of the products.

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Ensto’s accessories for low and medium voltage underground cable networks include complete, functional and reliable product packages with heat shrink and cold shrink technologies. Under the ground, the cables are protected against the demanding climate which makes the cable network very durable. The cable accessories are easy to install, safe to use and tested according to international standards’ requirements.

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