Single Electrode Earth

It is important to point out that the earth resistance measurement of reference is the 2-stake method. This method is referenced in all the electrical installation testing standards and can be used to measure the earth resistance both accurately and safely. The measurement principle involves using an appropriate generator G to inject an alternating current (i) through the auxiliary electrode H and back through the earth electrode E.

The voltage V between the earth electrode E and the point in the earth where the potential is zero is measured using another auxiliary electrode S.

Note:

In cases involving a network of multiple earths in parallel, the traditional methods applied to single earth electrodes may be used:

1. if you only require the overall earth value.

2. if the earth electrode measured can be disconnected from the earth network.