How to Arrange grounding rods?
Three-electrode method: Arrange the earth E and auxiliary grounding rods P and C in a straight line at intervals of about 5 to 10m * If they cannon be arranged in a straight line because of the presence of an obstacle, arrange E-P and E-C at angles of about 30 degrees or less. Two-electrode method: If an earth E whose grounding resistance is known is present nearby, the unknown groudning resistance can be measured by using it. Connect the terminal E of the earth resistance meter and the earth E by a cord. Measurements are taken between E and P / C assuming P and C terminals as one terminals. * The indicated value includes the knows resistance value of the earth E. Subtract the grounding resistance of E to obtain the true value.
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