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Great Ormond Street Hospital

Great Ormond Street Hospital


Clear Route Limited were engaged by UK Power Networks on behalf of its Client, Great Ormond Street Hospital to develop a feasibility study and subsequently install a new 10 MVA Supply, from King Henry’s Walk Main Substation located in LB Hackney, across LB Islington, to Great Ormond Street Hospital located in LB Camden.

Reason for Power Increase

The increase in power requirements was to support the new Morgan Stanley Clinical Building to provide a state-of-the-art facility, allowing the hospital to remain at the forefront of international paediatric care.

The 10 MVA Supply was provide through 2 nr 11 kV 300mm2 Cu Triplex Circuits to be laid in a fully ducted route for approximately 5.5 km.

Clear Route Limited was selected as the Contractor who provided the most economically advantageous turnkey solution.

Scope of Work

Clear Route Limited was responsible for all aspects of the installation, including the following;

  • Carry out duties of Principal Contractor as required under CDM 2007
  • Determine the viability of the indicative route selected by UK Power Networks
  • Liaison and Programming works with local Stakeholders
  • Issue Permits, Streetworks Notices, Limitation of Access
  • Installation and Recording of the cable route to strict Client Specification including reinstatement of Footways and Carriageways – modular, bituminous, and concrete
  • Installation of 11kV Cables and Pilots through ducted route
  • Carry out Intermediate Jointing of the new route
  • Carry out Senior Authorised Person duties and complete the switching out, and spiking of the existing 11kV Circuits, Jointing onto the network, Pressure Testing and Switching the new circuits into operation
  • Production of Primavera P6 Resource Loaded Programme by “In-House” P6 Planner.


Clear Route Utility Services Limited, carried out a Utility Survey Feasibility Study which identified a number of areas of potential difficulty including congested areas, Regents Canal crossing, London Underground and Railway Bridge Structures to cross.

This survey resulted in a section of the route being re-directed to avoid a potential underground structure.

The key challenges to this project included keeping all roads operational, highly congested areas, and co-ordinating the programme of works with the Local Boroughs.

Continuous liaison with the Boroughs was key to the success of the project, ensuring the whole process is properly managed, efficient, reliable, cost-effective, safe and, above all, of the highest quality.

Interface Issues

One area of challenge was the engagement of the local hospitals around the Great Ormond Street complex, there are other key Health centres situated in a location that has busy traffic routes receiving sick people by ambulance on a regular basis throughout the day.

Also the planned cable route crossed no fewer that 3 London Boroughs and also TFL roads which operates Red Routes for bus prioritisation.

Length of Cable Installed

6 Circuits of 11 kV Cable and associated pilots and fibre over a 5.5 km route.

Type of Cable Installed

11kV 300mm2 Triplex XLPE Cable


The duration of the route proving was 6 weeks this was followed by 32 weeks of construction

Existing Statutory undertaker’s records were provided to Clear Route Limited.

Trial Holes were carried out to confirm space existed and areas of possible concern (utility congestion) could be reviewed and alternative options considered.

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