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Post by Dan on Sept 24, 2014 8:49:41 GMT -5
What is Earthing Cement ? Where is it used ?
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Post by Samuel on Oct 1, 2014 4:31:45 GMT -5
Earthing Cement is a special type of cement used to improve the earthing resistance values. The cement consists of a carbon particles which increase conduction.
This increases the surface area of the earth conductor and lowers the earthing resistance values.
Special compounds such as Marconite can also be used to lower the earthing resistance values.
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Post by Dan on Oct 1, 2014 4:44:46 GMT -5
Following are the approx. limits of the earth resistance.
These values may change with countries and applications
Power stations - 0.5 ohms
EHV stations - 1.0 ohms
33 kV SS - 2 ohms
DTR structures - 5 ohms
Resistance of Tower Foot - 10 ohms
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