A square plot of land with sides length of 80 meters, for which it is intended to design a ground system consisting of N number of electrodes buried vertically in a soil whose specific resistance is 450 ohms. meters with a depth not exceeding 5 meters and with equal distances between them and tied together along the perimeter of the plot of land with a horizontal tape buried in the ground, its dimensions are to turn the page 4x40mm and the horizontal correction factor is 0.7 Calculate: 1- The number of electrodes (N) to obtain a ground resistance of not more

Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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A square plot of land with
sides length of 80 meters, for
which it is intended to design
a ground system consisting of
N number of electrodes buried
vertically in a soil whose specific
resistance is 450 ohms. meters
with a depth not exceeding 5
meters and with equal distances
between them and tied together
along the perimeter of the plot of
land with a horizontal tape buried
in the ground, its dimensions are
to turn the page 4x40mm and
the horizontal correction factor
is 0.7 Calculate: 1- The number
of electrodes (N) to obtain a
ground resistance of not more
than 2 ohms ( Hint: Suppose
the vertical correction factor =
0.7) 2- Recalculate the value of
the ground resistance using the
calculated value of N and using
the vertical correction factor
from the table with the exact
value and then compare it with
the required value.
Transcribed Image Text:A square plot of land with sides length of 80 meters, for which it is intended to design a ground system consisting of N number of electrodes buried vertically in a soil whose specific resistance is 450 ohms. meters with a depth not exceeding 5 meters and with equal distances between them and tied together along the perimeter of the plot of land with a horizontal tape buried in the ground, its dimensions are to turn the page 4x40mm and the horizontal correction factor is 0.7 Calculate: 1- The number of electrodes (N) to obtain a ground resistance of not more than 2 ohms ( Hint: Suppose the vertical correction factor = 0.7) 2- Recalculate the value of the ground resistance using the calculated value of N and using the vertical correction factor from the table with the exact value and then compare it with the required value.
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