Extra High Voltage

H&Askham EHV is part of the Group dedicated to undertaking projects for Extra High Voltage applications, above 66kV including;


  • Substation upgrade – GIS, AIS Indoor & Outdoor terminations
  • Straight joints
  • Transitions joints
  • Fully bonded EHV systems including link boxes, earthing,copper work etc


Our personnel are fully qualified with experience in voltages up to 400kV in both polymeric, oil and transition products. We have extensive knowledge of a range of systems including ABB, Ericsson, Nexans & Pfisterer and can boast to have staff capable of working on the older BICC Cables fluid filled products.


Our personnel are certified to work offshore and we have worked on EHV aspects of a number of offshore wind farms.


One of our key projects to date is the Wakefield B – 132kV GIS House. H&Askham had to provide 132kV jointing teams fully equipped to complete jointing works for 30 no. GIS terminations & 27 no. outdoor terminations. Services were also provided for all associated works including engineering support, design works & fabrication. Further information can be found in our Project Portfolio.


H&Askham also boast jointers with specialist skills andcapabilities to work on fluid filled systems and have been working extensively with Electricity Northwest (ENW) on network upgradecarrying out Ericsson poly to oil transition joints. ENW like many other network have endorsed our jointers to undertake works on their systems.


For further information on any of these services please do not hesitate to email us your enquiry on EHV@HandAjointing.co.uk or contact us through our website.