Earth Mat Testing Procedure

Application guide for equipotential earth mat installation on substation structure mounted switches version.

Earth mat testing procedure.

The measuring procedure described here uses the wenner method and uses the formula. Earthing mat is mostly used in a placed where the large fault current is to be experienced. This is unlike a small single electrode for example a lightning. Such type of system helps in limiting the ground potential.

In a tt system where a connection to earth is not provided by the. Electrical safety testing is essential to ensure safe operating standards for any product that uses electricity. One among that is earth test. Concrete or coke in electrical contact with the earth.

An earth electrode and earth electrode resistance are defined in bs 7671 as. Mat ansi astm d178 or equal while operating the test set. Various governments and agencies have developed stringent requirements for electrical products that are sold world wide. Testing large earth systems.

Measure the resistance of the mgn. Several tests are conducted to check the safety of products. The value is the resistance of that particular leg of the mgb. While designing an earth mat the following step is taken.

Earth electrode resistance the resistance of an earth electrode to earth. It reduced the overall grounding resistance. Frank wenner of the u s. Earth electrode conductive part which may be embedded in the soil or in a specific conductive medium e g.

In order to obtain a low enough value of earth resistance earth systems may consist of an earth mat covering a large area or many interconnected rods. Thirdly measure the individual resistances of the ground system using the selective test of the earth ground tester see fig. Read about design of substation earthing system here. 2 oct 2005 5 of 11 testing procedure before installation of gratings lv rubber gloves must be worn at all times when test leads are connected to the substation earths.

Earthing mat is made by joining the number of rods through copper conductors. The substation earthing system comprises of a grid earth mat formed by a horizontal buried conductors. Suitable test techniques must be used for large systems to ensure valid readings are obtained. Bureau of standards now nist developed.