Earthing System Health Assessment

Code of Practice for Earthing

Guide for Measuring Earth Resistivity, Ground Impedance, and Earth Surface Potentials of a Grounding System

Guide for Safety in AC Substation Grounding

Measures relating to Safety and Electric Supply

Provides guidelines for construction of structures

Chapter 2 Part b, 10 – Electrical System Technical Standards for Construction of Thermal Generating Stations.

• The Earthing System Shall Be Designed for a Life Expectancy of at Least Forty (40) Years and for Maximum System Fault Current or 40 KA for 1.0 Sec, whichever is Higher.
• The Minimum Rate of Corrosion of Steel Used for Earthing Conductor Shall be Considered as 0.12 mm per Year While Determining the Conductor Size. Grounding and Lightning Protection for The Entire Station shall be Provided in Accordance with Relevant IS (Indian Standard) / IEEE (Institute of Electrical and Electronics Engineers) Standards.

Technical Standards for Construction of Electrical Plants and Electric Lines Regulations – 2010. Chapter – 3, 37. Electrical system,
8 – Grounding system.

• The Grounding System Shall be Designed for a Life Expectancy of at Least Fifty (50) Years, For Maximum Fault Current of The System. The Touch and Step Potentials Shall be Maintained within Acceptable Limits as Per Relevant IEEE/ IS/ IEC Standards.