Answer / gunasekhar

the resistance offered by earth to absorb the high voltages and body shocks of electrical equipment. it ranges from 0.5-5 ohms.

Answer / guest

Ra+Rb+Rc=R
Ra=Length/ depth of the ground electrode•Electrode material
- Solid Copper, Stainless steel (High conductivity,
highcorrosion resistance but low strength & high cost)-
Copper clad steel (high strength, high corrosion
resistanceand low cost)
• The diameter of the rod
- Has little effect- Resistance would only decrease by 10%
by double thediameter
(
R
B
) - The contact resistance of the surrounding earthto the
electrode is negligible.(
R
C
)- The resistance of the surrounding body of eartharound the
ground electrode
- depends on soil conditions such as soil resistivity
4

Answer / vinoth

the earth resistance should be less than one

Answer / mohan.s

earth resistance is 2 ohm

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