Earthing Policy Training

The earthing requirements for ground-mounted distribution substations has changed, which has required a number of new TP21 suite of documents to be published in order to implement the latest requirements of ENA TS 41-24 & S34.

The new documents supersede parts of Standard Technique TP21D/3 which has also been amended to reflect these changes.

Actions to prepare for the implementation of the new requirements:

• The new requirement will be implemented from 1st August 2021.
• ICPs should use the period prior to 1st August to familiarise themselves with the new documents and the associated ‘Earthing Design Tool’ (EDT).
• The EDT can be accessed here.
• The following online training (voiced-over Powerpoint presentations) has been prepared for ICP staff who are required to use the EDT.