Edward Dewhurst Ltd  
Over 120 years of Services Engineering.
Services Electrical Engineering & Contracting Airfield Services Renewable Energy Medium Voltage Services Air conditioning Energy Monitoring Building Refurbishment Projects Critical Power Systems Thermographic Imaging Reactive Maintenance
Home > Services > Critical Power Systems
Critical Power Systems
Click here to access case studies

Edward Dewhurst Ltd has had a long association with projects related to the design, installation and commissioning of Critical Power Systems.

These have ranged from the installation of single generating sets supporting a designated load through to multiple generator installations complete with synchronized control systems.

In addition to this we have had considerable experience of specifying and installing both static and rotary UPS systems, which when linked to a standby generator gives a true no break emergency power supply in the event that a client’s normal supply network is lost.

In addition to the above Edward Dewhurst Ltd has on numerous occasions provided full turnkey solutions to our clients which have included the following key elements:

Provision of medium voltage infra structure including the provision of MV supplies up to 11kV.

Specification, supply, installation and commissioning of Power Distribution Transformers typically in the range of 750 to 2000 kVA.

Specification, supply, installation and commissioning of Medium Voltage Switchgear. We have considerable working experience of the installation and commissioning of equipment from leading manufacturers such as Schneider Electric with recent projects involving the installation of the VISAX and GENIE EVO ranges.

Supply, installation and commissioning of Low Voltage Switchgear. We have considerable working experience in the installation and commissioning of leading products such as GE System 4, GE SEN Plus, Schneider Electric & Tyco.

Design, specification, supply, installation and final commissioning of Diesel Generators, Static & Rotary UPS equipment, Low Voltage automatic changeover Control Panels and Distribution Switchgear.

Site installation of full site cabling requirements including cable containment systems and all associated local isolation to meet the requirements of BS 7671.

The provision of bulk fuel storage and fuel delivery in the support of generator installations. We provide bespoke fuel storage solutions to meet current environmental legislation. These include the installation of fuel pipe work, fuel pumps and bespoke control systems enabling full automatic control.

In order that we can offer our clients a full turnkey solution to their critical power installations Edward Dewhurst Ltd also carry out civil and construction works in support of their installations, these include erection of Sub Stations, Transformer pens and enclosures plus the construction of structural support bases for all items of equipment such as Transformers and Diesel Generators. In addition to this we carry out all excavation & trenching works to facilitate the installation of MV & LV cabling. In order to meet current legislation we have partnering agreements with leading consultants who assist us with vetting our final design proposals. This covers all client requirements ranging from Planning and Building Regulations through to structural and environmental.

Specialist testing services in support of critical power installations include the following:

• The provision of resistive / reactive load banks for generator testing.
• Primary injection of Air Circuit Breakers.
• Soil resistivity testing.
• Design, installation and testing of earthing systems.
• Ductor Testing of LV & MV Switchgear.
• IR & Pressure testing of MV cabling.
• Installation and commissioning of Protection Systems.
• Installation and commissioning of Sub Station Tripping Battery equipment.


Lancashire Teaching Hospitals NHS Trust
University of Morecambe Bay NHS Trust
BAE Systems
Virgin Media
Peel Airports
Cofeley GDF Suez
AXA Insurance