Cable Earthing Link Boxes
Cable Earthing Link Boxes
Insulect manufacture a comprehensive range of fully-tested stainless steel link boxes for high voltage underground cables.
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).
LINK BOX SPECIFICATION
The Insulect range of Link Boxes includes two models - Ultra and Lite - and numerous variants to suit all underground cable applications and network requirements.
Our link boxes ensure a weatherproof environment for connecting links, whether for earthing or cross-bonding high voltage cables.
Link Boxes are part of our wider Switchgear product range, which includes switchgear for substations, overhead distribution and underground cable applications.
LINK BOX
BROCHURE
SWITCHGEAR
BROCHURE
LINK BOX KEY TECHNICAL INFORMATION
Link Box Mounting
Structure or Pit
DC Withstand
25 kV/5mins
Pressure Withstand
250 kPa
Compliance Rating
C 55/4
Available in two models
LINK BOX ULTRA
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
LINK BOX LITE
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
LINK BOX
FEATURES
COMPREHENSIVE RANGE
Link boxes of all types for single core and concentric bonding cables
ABOVE OR BELOW GROUND
Universal design to suit indoor, outdoor and in-pit installation
UP TO IP68 ENCLOSURES
Fully tested and fully sealed stainless steel enclosures, rated at a minimum of IP68
AUSTRALIAN DESIGN AND MANUFACTURE
Our link boxes have been designed, manufactured and tested in Australia for over twenty years
ALL EARTHING PRACTICES
Direct earthing, SVL earthing, cross bonding, cable sheath protection
LINK BOX
MATERIALS
LINKS
Extruded copper in hard drawn high conductivity 300mm2 minimum
BODY
Stainless Steel 316 or 204
INSULATORS
High tension porcelain, stainless steel hardware
PLATING
All conductors plated with ≥8μm of tin.
STRESS CONES
Polyurethane elastomer
SVLs
Zinc oxide sheath voltage limiters
SHEATH VOLTAGE LIMITERS IN LINK BOXES
Safeguarding underground cables
Sheath Voltage Limiters (SVL) are used in Link Boxes as an economic solution for safeguarding expensive cable installations.
SVLs are highly 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) for our Link Box range and for individual sale.
Voltages: 1.5kV to 9.0kV
UNDERGROUND CABLE MONITORING
Maximise cable asset protection and load management
Underground power cables are a growing asset management priority for many network operators. These high value assets are not as readily accessible as other grid components, yet are often network critical and in need of improved condition insights.
Insulect provide several monitoring technologies aimed at protecting and optimising load on underground cables, including cable partial discharge monitoring, distributed acoustic sensing, distributed temperature sensing, and real time thermal rating for cables.
