Grounding (Earthing) is a system of electrical circuits that are connected to the ground that functions when a leakage current can discharge electricity to the earth.
According to the Institute of Electrical and Electronics Engineers (IEEE) Standard 142 2007, the purpose of the grounding system is to:
Limit the amount of voltage to the earth to be within the allowed limits
Provide a path for current flow that can provide detection of the occurrence of an undesired relationship between the system conductor and the earth. This detection will result in the operation of automatic equipment that decides the supply of voltage from the conductor. Over time, corrosive soils with high moisture content, high salt content, and high temperatures can degrade ground rods and their connections. So although the ground system, when initially installed, had low earth ground resistance values, the resistance of the grounding system can increase if the ground rods are eaten away. Grounding testers, like the Fluke 1630-2 FC Earth Ground Clamp and the highly efficient Fluke 1625-2 kit Advanced GEO Earth Testers, are indispensable troubleshooting tools to help you maintain uptime. With frustrating, intermittent electrical problems, the root cause could be related to poor electrical ground or poor power quality. That is why it is highly recommended that all grounds and ground connections are checked at least annually as a part of your normal Predictive Maintenance plan. During these periodic checks, if an increase in resistance of more than 20 % is measured, the technician should investigate the source of the problem, and make the correction to lower the resistance, by replacing or adding ground rods to the ground system. Get Fluke 1625-2 kit, Fluke 1630-2 and other Earth Testing & Measurement tools from our website www.gilautomation.com/fluke