Earth Mat Testing Procedure

It reduced the overall grounding resistance.

Earth mat testing procedure.

Testing large earth systems. The measuring procedure described here uses the wenner method and uses the formula. Read about design of substation earthing system here. The grounding system in substation is very important.

Such type of system helps in limiting the ground potential. Electrical safety testing is essential to ensure safe operating standards for any product that uses electricity. The 3 point method called the fall of potential method comprises the earth electrode to be measured and two other electrically independent test electrodes usually labelled p potential and c current these test electrodes can be of lesser quality higher earth resistance but must. The value is the resistance of that particular leg of the mgb.

While designing an earth mat the following step is taken. Concrete or coke in electrical contact with the earth. Measure the resistance of the mgn. Frank wenner of the u s.

Several tests are conducted to check the safety of products. Mat ansi astm d178 or equal while operating the test set. Thirdly measure the individual resistances of the ground system using the selective test of the earth ground tester see fig. This method is derived from the 4 point method which is used for soil resistivity measurements.

Suitable test techniques must be used for large systems to ensure valid readings are obtained. Earth electrode conductive part which may be embedded in the soil or in a specific conductive medium e g. Earthing mat is made by joining the number of rods through copper conductors. Earthing mat is mostly used in a placed where the large fault current is to be experienced.

Bureau of standards now nist developed. Various governments and agencies have developed stringent requirements for electrical products that are sold world wide. In a tt system where a connection to earth is not provided by the. Application guide for equipotential earth mat installation on substation structure mounted switches version.

One among that is earth test. Earth electrode resistance the resistance of an earth electrode to earth. An earth electrode and earth electrode resistance are defined in bs 7671 as. 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.