Cable Installation, Terminating And Jointing

Using our specialist cable installation teams we are able offer the complete range of cabling solutions from control and auxiliary cables, low voltage power to high voltage power cabling. Each team is fully equipped with cable winches, cable drum jacks, rollers and drum trailers to enable any installation to be completed smoothly and efficiently. IES’ team of experts including a highly experienced management team and skilled field operatives have over 40 years experience working within the cable installation industry. In addition, all of our field operatives are JIB members and hold all statutory and relevant certificates of competency of their various disciplines.

Procurement, Maintenance And Repair


Supply, management and distribution of electrical cables and accessories, continually adapting to the needs of the oil and gas, petrochemical, marine, offshore, construction and energy industries. We can assemble complete turnkey packages of cables, glands, lugs, cleats, tray, ladder and other accessories as required. Our objectives are to satisfy all of your cable requirements, from an immediate demand to an integrated Cable Management Package - quickly, effectively and competitively. We combine material availability with technical expertise to develop the most cost-effective cable solution for your project needs.


Power distribution transformers with oil, silicon, Midel or resin insulation are regularly supplied and installed by IES with ratings between from 50KVA to 5000KVA and voltage ratios to suit the electrical distribution or generation requirements. Transformers can be supplied as free standing units or have an 11kV ring main unit or circuit breaker mounted directly onto the HV bushings. On the LV side fused or ACB distribution cabinets can be supplied tailoring the transformer package to the individual site requirement.

At primary voltages above 11kV IES can supply and install Power transformers at voltage levels up to 132kV for ratings between 5 and 60MVA.


Installation of high voltage switchgear is a highly specialised activity and IES have the specialist expertise to install switchgear from 400V to 132kV. Each and every switchboard installation is supervised by a trained engineer and to date IES have installed and commissioned every current make of 11kV switchgear including oil, air, SF6 and vacuum circuit breakers. Once installed each switchboard is tested and commissioned to exacting standards.

On many sites switchgear is reaching the end of it’s design life, IES prides itself in being able to offer replacement solutions to minimise the site shutdown period.


At the centre of any industrial site there will be an electricity substation forming the hub of the electrical infrastructure, working 24 hours a day seven day a week. The reliable running of this substation is of no coincidence when you employ IES to design, install test and commission the works. Electricity substations are regularly installed across all the voltage ranges from 400v to 132kV with each substation tailored to the requirements of the site with switchgear, transformers and protection schemes selected to provide the right engineering and commercial solution.

We are specialists in all types of cable installation, electrical contracting, high voltage cable jointing and associated civils works.

We are able to install and fix cables below and above ground in all types of containment systems such as:- Ladder rack, tray, troughing, basket, trunking, duct, trench, catenary and drag chains.

The valuable experience that we have enables us to successfully undertake projects, regardless of size or complexity within many industrial sectors including major construction, oil and gas stations, petro chemical and power stations, the railway industry, nuclear plants, off shore/sub sea cabling, data and fibre optic cabling and the ship building industry.

For further information or to discuss your individual requirements, please do not hesitate to get in touch.

Core Service Features

- LV and HV cable installation
- HV jointing and pressure testing
- Data, fibre optic, control and instrumentation cable installation
- Associated civils works
- Installation of containment systems

With the combination of traditional skills and modern techniques IES HV cable jointers have the training and experience to joint and terminate all types of cable whether a new installation of XLPE cable or existing paper lead or PICAS cables

Testing and Commissioning

The testing and commissioning of high voltage electrical equipment is a highly specialised activity with each and every installation being tested by a trained engineer to exacting standards.

IES testing capability covers an extensive range of disciplines :

Cable Installations

- 1kV and 5kV Insulation tests
- DC pressure tests up to 33kV
- VLF cable testing


- HV and LV winding Insulation tests
- Winding ratio checks
- Bucholz testing
- Oil sample and testing (electrical breakdown, acidity, water and PCB content, Dissolved gas analysis)


- AC pressure testing
- Ductor testing
- CT’s - Ratio and flick tests, Mag curves
- VT’s - Ratio and polarity checks
- Functionality checks
- Protection testing


- Primary and secondary injection
- Timing tests
- Overcurrent and earth fault relays
- Directional Overcurrent and earth fault relays
- Differential transformer protection
- Translay and Solkor feeder unit protection
- Restricted and standby earth fault relays
- Generator loss of mains and G59 protection
- Neutral voltage displacement
- Transformer auto tapping relays
- Intertripping schemes


- Soil resistivity measurements
- Final earth electrode resistance

Underground Fault Location

- Digital pulse echo

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