Megger Limited PWS / Nov 06
DET4TC/R Launch
26
As can be seen in the above diagram, none of the test current flows through the
earth mass. In fact the measurement will be a short circuit.
Another example:
Test a guy line on a telecoms tower.
As the guy line are all linked together both at the tower metal work and at the anchor
point, a loop is formed, and no current flows through the earth mass. Hence the
reading will not be the resistance of the guy line to earth.
The Best Application of “Stakeless” testing
There are many applications where Stakeless testing will work extremely well.
These include:
• Field of earth / Earth Farms
• Pole mounted transformer electrodes
• Pole mounted transformer guy line when connected to earth system
• Earthing in Sub-station cable cellars
o It is often impossible to drive in test stakes so this is an ideal
application for Stakeless measurements.
• Single guy lines on towers
• Lightning protection electrodes
With a good understanding ‘ART’ and ‘Stakeless’ testing will be invaluable tools,
saving both time and trouble. Further information regarding Megger’s range of earth
testers and their applications may be found at www.megger.com
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