HV Cables

HV Cables

Mainline has established itself as a leader within the industry for the installation of underground cables from 20kV to 220kV. We offer the complete service of cable installation, cable jointing and cable testing. We are approved by ESB Networks to joint cables up to 220KV.

We have developed our cable installation systems to allow us install underground cables over distances in excess of 1,100m. This results in fewer joints and joint pits on the cables, enabling us to offer value engineering solutions to our clients, as well as a significant time saving.

Mainline also provides a full underground cable duct design and installation service, where we select the optimum duct type and size, to ensure that cable pulling tensions are within cable manufacturers guidelines, whilst also ensuring that future electrical losses are kept to a minimum. All our cabling pulling and duct proving equipment has been fitted with computerised data recorders which are Wi-Fi enabled for real time information sharing.

Sample Projects

Crory 110KV Sub-station To Ballycadden/Ballyduff Windfarms. Installation of 30 Km of 3x 400sq. 20KVv underground cable and installation of communication fibre optic.

38KV grid connection, installation and jointing of 20mm of 38 KV cable and communication fibre optic from Barranafaddock Wind Farm to Barrymore ESB 38 KV substation.

  • Knocknalour WF to Crory 220kV Substation (12km)
  • Gortahile WF to Carlow 38kV Substation (18km)
  • Dromdiveen WF to Glenlara 110 kV Substation (19km)
  • Garrycummer WF to Cauteen 110 kV Substation (17km)
  • Gibbet Hill WF to Crory 220kV Substation (14km)
  • Grouse Lodge WF to Rathkeale 110kV Substation (6km)
  • Bawnmore (1&2) WF to Macroom 110kV Substation (10km)
  • Boggeragh WF to Glashavoon 220kV Substation (8km)
  • Ballyvane WF to Ballylickey 110kV Substation (25km)
  • Knockwarriage WF to Trien 110kV Substation (33km)
  • Letterfrack WF to Salthill110kV Substation (20km)
  • Ballybeagh WF Thurles – Blanchfield 38kV Substation (26km)
  • Cordal to Scartaglin 38kV Grid Connection (12km)
  • Tullanamoyle II and III 20kV Grid Connection (8km)
  • Ballycumber WF Kilmagig – Mangans 38kV Substation (27km)

Mainline have been contracted by Atlantic Projects Company (APC) to carry out the design, supply and install of various element of civil and electrical works associated with a double 275kV grid connection, connecting the existing NIE 275kV substation within Kilroot Power station and the new 275kV GIS switchgear.