Earthing

Correctly designed and installed earth electrode systems are essential for the correct operation of equipment and to ensure the safety of people.

The earthing practices followed by Vectis meet all relevant British standards including BS EN 50522 and BS 7430, amongst others. Our earthing systems ensure electrical current is captured and dispersed safely to earth during fault conditions, ensuring safety at all times.

Our fully trained engineers have the knowledge and experience to deliver turnkey solutions for your HV and LV earthing requirements. Our services include survey, design, installation and commissioning to provide a safe and compliant earthing system.

Our Process

Survey

At Vectis, we are able to perform a wide range of services to meet our customer’s earthing needs.

Invaluable experience gained through involvement in diverse projects across a wide spectrum of industries allows us to make sure we understand and satisfy our customers’ requirements.

Vectis is able to offer the following services:

Soil resistivity measurements
Trial electrode installation and measurements
Earth continuity measurements
Touch and step voltage assessments
D.C. earth resistance measurements (fall of potential method

Design

Correctly designed HV and LV earth electrode systems are essential for the correct operation of equipment and to ensure the safety of people. Vectis offers a comprehensive earthing design service, using industry recognised CDEGS software, and has the ability to progress projects from initial concept, to installation and final commissioning. Experience gained through our involvement in numerous prestige projects benefits our customers as we are able to offer detailed, compliant and practical design solutions.

Installation

Not only do our customers benefit from our survey and design services but also from our directly employed experienced installation team of engineers operating nationwide.

Vectis engineers have the competence and experience in completing earthing installations on a wide range of projects; covering transmission and distribution up to 400kV, industrial, commercial, transportation and renewable energy market sectors.

Our earthing installations can include:

Exothermic welding
Oxy-fuel (Sil-Fos®) brazing
Fully-rated bridging of operational earthing systems
Terminal tower and cable sealing end (CSE) earthing
Anti-static earthing
Above and below ground earthing installations
Theft prevention solutions
Fence earthing, including GRP solutions
Ground excavation and reinstatement

Testing

Inspection and testing of earth electrode systems is essential to ensure they remain in a safe and effective condition. Poorly maintained systems can result in higher earth rise potentials, than those initially calculated, resulting in higher touch and step voltages being present potentially making the site unsafe.

As part of ongoing maintenance, Vectis recommends that all systems are visually inspected and individual electrodes are measured annually.

Our nationwide specialist inspection, testing and maintenance engineers enable us to test earthing systems, assess their condition and if required, make recommendations for improvement to bring systems in line with the required standards.

Standards

BS 7430 Code of practice for protective earthing of electrical installations
BS 7671 Requirements for Electrical Installations
BS EN 50122-1 Railway applications – Fixed installations – Electrical safety, earthing and the return circuit – Part 1: Protective provisions against electric shock
BS EN 50122-2 Railway applications – Fixed installations – Electrical safety, earthing and the return circuit – Part 2: Provisions against the effects of stray currents caused by d.c. traction systems
BS EN 50122-3 Railway applications – Fixed installations – Electrical safety, earthing and the return circuit – Part 3: Mutual Interaction of a.c. and d.c. traction systems
BS EN 50522 Earthing of power installations exceeding 1 kV a.c.
DNO specific engineering specifications
ENA TS 41-24 Guidelines for the design, installation, testing and maintenance of main earthing systems in substations
EREC S34 A guide for assessing the rise of earth potential at electrical installations
EREC S36-1 Identification and Recording of ‘Hot Sites’ – Joint Electricity Industry / British Telecom Procedure
NG TGN(E)187 Guidance for Conductor Jointing in Substations
NG TS 3.01.02 Technical Specification – Earthing