The student engineer of a campus radio station wishes to verify the effectiveness of the lightning rod on the antenna mast (see the figure below). The unknown resistance R is between points C and E. Point E is a "true ground," but is inaccessible for direct measurement because the stratum in which it is located is several meters below Earth's surface. Two identical rods are driven into the ground at A and B, introducing an unknown resistance Ry. The procedure for finding the unknown resistance R is as follows. Measure resistance R₁ between points A and B. Then connect A and B with a heavy conducting wire and measure resistance R₂ between points A and C. A Yes C O No B RR (a) Derive a formula for Rx in terms of the observable resistances, R₁ and R₂. R₂ = i (b) A satisfactory ground resistance would be Rx < 1.9 2. Is the grounding of the station adequate if measurements give R₁ = 11 2 and R₂ = 5.9 02?
The student engineer of a campus radio station wishes to verify the effectiveness of the lightning rod on the antenna mast (see the figure below). The unknown resistance R is between points C and E. Point E is a "true ground," but is inaccessible for direct measurement because the stratum in which it is located is several meters below Earth's surface. Two identical rods are driven into the ground at A and B, introducing an unknown resistance Ry. The procedure for finding the unknown resistance R is as follows. Measure resistance R₁ between points A and B. Then connect A and B with a heavy conducting wire and measure resistance R₂ between points A and C. A Yes C O No B RR (a) Derive a formula for Rx in terms of the observable resistances, R₁ and R₂. R₂ = i (b) A satisfactory ground resistance would be Rx < 1.9 2. Is the grounding of the station adequate if measurements give R₁ = 11 2 and R₂ = 5.9 02?
Chapter4: Conductor Sizes And Types, Wiring Methods, Wire Connections, Voltage Drop, And Neutral Conductor Sizing For Services
Section: Chapter Questions
Problem 34R: The marking on the outer jacket of a nonmetallic-sheathed cable indicates the letters NM-B. What...
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The student engineer of a campus radio station wishes to verify the effectiveness of the lightning rod on the antenna mast (see the figure below). The unknown resistance Ry is between points C and E. Point E is a "true ground," but is inaccessible for direct measurement because the stratum in which it is located is several meters below Earth's surface. Two identical rods are driven into the ground at A and B, introducing an unknown resistance Ry. The procedure for finding the unknown resistance Rx is as follows. Measure resistance Ry between points A and B. Then connect A and B with a heavy conducting wire and measure resistance
R, between points A and C.
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