Cable Earthing Link Boxes

Cable Earthing Link Boxes


Insulect manufacture a comprehensive range of fully-tested stainless steel link boxes.

Insulect link box designs use various earthing practices to minimise sheath currents and provide sheath voltage protection.

  • Direct Earthing or SVL Earthing through sheath voltage limiter surge arrester.
  • Cross Bonding with insulation withstand between phases.
  • Cable Sheath Protection using metal oxide sheath voltage surge limiters (SVLs).
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Insulect have a comprehensive range of link boxes covering the full range of HV cable sheath earthing applications.

Our Link Boxes ensure a weather proof environment for connecting links, whether for earthing or cross-bonding high voltage cables.




link box pit mounted, structure mounted

Link Box Mounting

Structure or Pit

link box dc withstand voltage

DC Withstand

25 kV/5mins

link box pressure withstand

Pressure Withstand

250 kPa

link box UK EA C55/4 engineering compliance rating

Compliance Rating

C 55/4


Available in two models


ULTRA is our original Link Box design, built for demanding conditions and highest performance.

Material 316 Stainless Steel
Short Circuit 63 kA/1s
Enclosure rating IP68
Internal power arc 40 kA/0.12s
Pressure test meter 10M


The LITE is designed for for less arduous applications and where ease of handling and install is important.

Material 304 Stainless Steel
Short Circuit 40 kA/1s
Enclosure rating IP68
Internal power arc 20 kA/0.12s
Pressure test meter 2M

Cross bonding link box exploded view

Sheath Voltage Limiters (SVL) are an economic solution for safeguarding expensive cable installations.

SVLs are highly reliable and effective at managing cable sheath voltage rises and the associated power flows that can result under fault conditions.

Insulect manufacture an extensive range of quality 20kA zinc oxide sheath voltage limiters (SVL’s).

Voltages: 1.5kV to 9.0kV

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