This document provides guidance on earthing practices for Central Networks. It describes recent changes including classifying distribution sites as hot or cold based on their connection type. Hot sites require segregated high voltage and low voltage earths due to risks of high earth potential rise. The document details standard earthing methods used on different voltage networks from 132kV to low voltage, and provides references to other sections for soil testing, earth resistance testing, and standard earthing layouts.
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HV Substation Earthing Guide - Central Networks
1. Central Networks Earthing Manual
Section E2
Earthing Guidance Notes
Version: 2 Date of Issue: September 2007
Author: Nigel Johnson Job Title: Earthing Specialist
Approver: John Simpson Job Title: Head of Network Engineering