Consultancy & Policy Support

National Grid employs world leaders in all aspects of High Voltage (HV) technology. Our consulting capability is based on our depth of experience and expertise in all phases of the asset lifecycle. We offer specific consultancy services relating to Asset Health, Harmonics, Earthing Studies and Electromagnetic Frequency (EMF) Testing, as well as bespoke consultancy services.

Throughout National Grid’s long history in electricity transmission, we have built up extensive expertise and experience, along with a vast array of technical information. To support you in establishing your asset policies, National Grid has a wealth of engineering documentation, such as Technical Standards and Tower Drawings that customers can access electronically.

Asset Health

We work with our customers to understand the condition of their assets and actions required in order to minimise breakdowns, increase availability and prolong asset life. We employ world leaders in high voltage technologies and therefore we can help customers with a broad range of enquiries.


Our harmonic consulting services can assist customers in fulfilling their obligations, delivering key design outputs and providing advice and recommendations on how to ensure compliance. Download our leaflet below, for full details.

Download the Harmonics Consultancy Services leaflet

Earthing Studies

Rise of Earth testing includes determining the earth return current for a given customers required location. We will then produce a report and assessment of these results. Download our ‘Ask the Experts’ document below, for further information on Earthing Studies.

Download the Ask the Experts Earthing Studies document  

Electro Magnetic Fields

Our EMF team can carry out assessment work on the magnetic fields of plant and equipment on behalf of our customers and report on these results. Please contact us with your requirements.

Technical Standards Documents

To provide a more flexible, tailored service to our customers, the extensive range of National Grid technical standards documents can now be purchased individually, in batches of 10, or in bulk, for greater cost efficiency.

The range of documents on offer is vast and includes Technical Specifications, Technical Guidance Notes and Transmission Procedures. These documents are now stored and sold via our intermediary supply partner, IHS, which specialises in this area of online documentation sales.

To view our portfolio of documents and purchase without delay, visit the National Grid section of the IHS website. 

View and Purchase National Grid’s  Technical Standards Documents


HV Tower Drawings: Tower Library

We offer a library service of overhead line tower drawings, which provides:

• Shared storage

• Retrieval and use

• Document management

The tower library contains around 85,000 drawings for overhead line towers from 66kV up to 400kV.

Send us your enquiry