Earth Mat Testing Procedure

Such type of system helps in limiting the ground potential.

Earth mat testing procedure.

Earth electrode conductive part which may be embedded in the soil or in a specific conductive medium e g. While designing an earth mat the following step is taken. 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. Electrical safety testing is essential to ensure safe operating standards for any product that uses electricity.

It reduced the overall grounding resistance. An earth electrode and earth electrode resistance are defined in bs 7671 as. Several tests are conducted to check the safety of products. The substation earthing system comprises of a grid earth mat formed by a horizontal buried conductors.

Frank wenner of the u s. The grounding system in substation is very important. 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. One among that is earth test.

Mat ansi astm d178 or equal while operating the test set. 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. Measure the resistance of the mgn.

In a tt system where a connection to earth is not provided by the. Concrete or coke in electrical contact with the earth. Earth electrode resistance the resistance of an earth electrode to earth. 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. Testing large earth systems. Read about design of substation earthing system here. Earthing mat is made by joining the number of rods through copper conductors.

Thirdly measure the individual resistances of the ground system using the selective test of the earth ground tester see fig. Various governments and agencies have developed stringent requirements for electrical products that are sold world wide. 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.