Submitted by DonHester on Tue, 04/09/2019 - 09:01.
“Building Code Of The Day” Question: When evaluating the resistivity of a grounding electrode as the temperature of the soil decreases, what happens to the soil resistance?
A) Decreases
B) Increases
C) No change
Answer: ?) B) Increases
The resistivity of the soil is also influenced by temperature. Figure 3 shows the variation of the resistivity of sandy loam, containing 15.2% moisture, with temperature changes from 20° to -15°C. In this temperature range the resistivity is seen to vary from 7,200 to 330,000 ohm-centimeters.
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