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National Grid (NG)

IHS is your source for National grid standards and publications.

National Grid is your source for Electricity Transmission engineering specifications, procedures and policies, available in hard copy or PDF download.

As the owner and operator of the high voltage (HV) electricity transmission network in England and Wales, National Grid has substantial experience and technical expertise in providing a safe, reliable and available electricity transmission system.

Our HV electricity transmission network is founded upon a wealth of experience. Some of the world’s leading engineers have developed our technical documents, the foundation of how we operate our network. Key Facts:

  • National Grid has over 1000 technical documents
  • Topics include Substations, Cables, Overhead lines, Interconnectors and Safety Procedures
  • Leading engineers from round the world have contributed to the development of our technical documents.
  • National Grid’s electricity transmission predominantly operates between 132kV and 400kV


The contents of National Grid engineering documents are based on the needs of National Grid and the conditions under which it operates. It should not therefore be assumed that the specifications and requirements stated therein necessarily meet the particular circumstances and requirements of other organisations. The principles set out in this document are for information only and therefore National Grid is not liable to customers / suppliers for any loss or damage resulting from reliance on the contents. It is the responsibility of such external organisations to check that the document is the latest version and is appropriate for their purposes.

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