An earth electrode consisting of a round section metal pipe of 15 mm diameter is driven in to ground toa depth of 5.3 m. The resistance of this electrode is required to be 30 Ohm with earth resistivity of 100Ohm-m at this point. Find the effective earth resistance if a similar electrode is placed at a distance of1.5 m from the first one when both the electrodes are bonded together using a bonding wire of negligibleresistance.13L

Given as, D= 15mm= 0.015 m, L= 5.3 m, R= 30 ohm, ρ= 100 ohm.m S= 1.5 m.

Answered: ilar electrode is placed at a di ether…

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ilar electrode is placed at a di ether using a bonding wire of m

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter12: Electronic Control Devices

Section: Chapter Questions

Problem 14RQ

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Question

An earth electrode consisting of a round section metal pipe of 15 mm diameter is driven in to ground to
a depth of 5.3 m. The resistance of this electrode is required to be 30 Ohm with earth resistivity of 100
Ohm-m at this point. Find the effective earth resistance if a similar electrode is placed at a distance of
1.5 m from the first one when both the electrodes are bonded together using a bonding wire of negligible
resistance.
13L

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