The project involved installing a new 11kV supply c.3.5 km away from the Point of Connection (POC) issued by Scottish Power due to the remote location. In order for IUS to meet Scottish Water deadlines we installed the cable within adoptable carriageway. The cable route included crossing a motorway bridge over the M77, grass verge adjacent to the A77 and a single track carriageway along Highfield Farm Road. IUS also had to carry out directional drilling under four water crossings due to insufficient depth on the bridges. The area where the new Drumboyhill tank is located was within a area of heavy peat, so specialist equipment was required to excavate as well as access the wood pole for the transformer work.

IUS were engaged as Principle Designer on this project and had a full time Coordinator along with a Project Manager and HSQE Advisor, working in collaboration. Two additional Contractors were working in the area, therefore close engagement and coordinated programming of works were of high importance.

All works on site were completed on time, within budget and were handed over to the Distribution Network Operator for adoption on energisation.

The project involved the provision of a bespoke GRP enclosure to house the Distribution Network Operator (DNO) 5 panel 11kV switchboard, with the clients 11kV switchgear located within the fabric of the main Pump House, constructed by others. Two independent 3.6MVA circuits were provided from individual primary substations on the DNO 11kV network.One feeder for normal service conditions and one circuit for security of supply in the event of a fault on the principal supply.

Both 11kV cable routes to the Pumping Station involved extensive excavation over circa 7km, including under three railway bridges and over numerous road bridges. This required additional engineering solutions to negotiate. The IUS scope of works included interface with all stakeholders, most notably Network Rail, local councils, the DNO, SEPA, as well asScottish Water. The private electrical infrastructure installed by IUS included an eight panel 11kV switchboard, three 2MVA transformers, one 0.8MVA transformer, 11kV cabling, control/metering wiring, electrical protection and substation ancillary equipment.

The works necessitated the installation of new H-Poles adjacent to the existing Scottish Power Energy Networks (SSEN) overhead line. These Hpoles would accommodate the installation of a 33,000/433V, 200kVA pole mounted transformer (PMT) and associated components. From the LV side of the PMT, a LV cable was laid to the new RWPS kiosk, terminating in a cutout beneath the installed current transformer metering panel. 

The feeder route necessitated a road crossing. To minimize disruption to traffic flow on the A82, the road crossing was undertaken by directional drilling.

Extensive engagement with SSEN was maintained throughout the duration of the works to ensure full compliance with their adoptable standards. On completion the substation was energised and the RWPS is now in full operation.

IUS undertook full design duties and operated as Principal Contractor (PC) for all our site works, liaising closely with Scottish Water’s own PC for the main development.

Over 500m of excavation, duct laying, cable installation and full reinstatement was undertaken by IUS from the SPEN point of connection to site. Point of connection identification, jointing and cable testing were also completed in accordance with SPEN specifications.

IUS fulfilled the role as Principal Contractor for the connection, implementation and management of all works associated with the project, including a rolling traffic management scheme to align with the progress of the works.

IUS effected all communication and liaison with the residents and key stakeholders, ensuring full awareness of the works, their progress and successful completion.

Following significant reinforcement of the local 11kV network by SSEN, a suitable point of connection was identified for IUS to utilise.

IUS designed, supplied and installed the 3 core 150mm 11kV polymeric (LLDPE) cable circuit, from the overhead line point of connection, terminating at the HV switchgear controlling the 11,000/433V, 500kVA ground mounted transformer. The substation apparatus was located within a new purpose-built GRP housing. A LV supply was provided from the switchgear to the SW kiosk within the site. All apparatus was tested by IUS prior to energisation.

IUS fulfilled the role as Principal Contractor for the works and undertook all cable joints and terminations. Active engagement was maintained with all third parties, including SSEN to ensure that the works were completed to their requirements and to client timescales.

Following extensive engagement with Scottish and Southern Energy Networks (SSEN) the Distribution Network Operator, IUS was able to develop several service options to facilitate the connection to the WTW.
Within these options key considerations with other stakeholders were required, including with Forestry Commission Scotland, due to the sensitivities of the area.

IUS supplied and installed new 33kV overhead line construction. Approximately 950m of 95mm single core (triplex) aluminium 33kV cable was laid below the Forestry Commission Scotland access track, terminating at a ground mounted substation, which included a 33,000/433V, 500kVA transformer. A 300mm 4 core aluminium Wavecon cable was installed from the substation transformer, terminating at a 600Amp fused cut-out beneath the LV current transformer metering panel. The full HV and LV network was designed, procured, installed, tested and commissioned by IUS. On completion of the works to the adoptable standards of SSEN, the substation was energised. The WTW is now in full operation.

The works were undertaken during weekends only, to avoid disruption to the main site works.