AEMC 4500 User Manual
Also see for 4500: User manual
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Contents
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Effect of Ground Electrode Depth on ResistanceTo assist the engineer in determining the approximate ground rod depthrequired to obtain a desired resistance, a device called the GroundingNomograph may be used. The Nomograph, shown on the followingpage, indicates that to obtain a grounding resistance of 20 ohms in asoil with a resistivity of 10,000 ohm-centimeters, a 5/8" OD rod must bedriven 20 feet. Note that the values indicated on the Nomograph arebased on the assumption that the soil is homogeneous and, therefore,has uniform resistivity (Figure 17). The Nomograph value is an approx-imation.Digital Ground Resistance Tester Model 4500 23The Effect of Temperature on theResistivity of Soil Containing Salt*(Sandy loam, 20% moisture.Salt 5% of weight of moisture)Temperature(Degrees C)20100-5-13Resistivity(Ohm-centimeters)1101421903121440* Such as copper sulfate, sodium carbonate and others. Salts must beEPA or local ordinance approved prior to use.Figure 16 |
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