Megger Limited PWS / Nov 06
DET4TC/R Launch
6
• Stakeless Test – Look no test spikes!
o Although the 3-pole method is the traditional method of test earth
electrode resistance, it relies on driving auxiliary test spikes into the
ground, which is not always practical. Imagine trying to drive spikes in
inner city concrete jungles, and locations such as cable cellars
beneath sub stations.
o Another ideal application for this test is measuring electrode
resistance on lightning protection system on buildings.
• The stakeless method utilises two clamps. One to induces
current into the circuit the other the measure the resulting
amount.
• The measurement taken is the resistance of a loop, including
that of the electrode under test.
• The reading will not directly compare to the 3-pole method due
to the additional elements in the reading. However the
readings will always be optimistic and should be repeatable,
ideal for monitoring the earth electrode condition over time.
• Stakeless measurements made in 4-pole mode allow all test
lead resistances to be ignored.
In summary, with the addition of ART and Stakeless testing, DET4TC/R is an
excellent replacement for the DET5/4. The DET4TC/R provides real additional
benefits to the customer in terms of ease of use and the ability to take measurements
in situations the DET5/4 cannot.
Provided with this sales guide in appendix A, is a applications note giving detailed
information on how to use ART and Stakeless testing. This will give valuable
assistance to customers, allowing them to fully understand and get the most from
these test methods.
Further, more detailed information on earth testing may be found on the Megger
Earth/ground micro site. http://www.megger.com/us/story/Index.php?ID=125
THIS PRODUCT IS USED BY?
• Electrical contractors,
• Utilities, Maintenance
• Railways
• Repair Organisations (Industrials),
• Telecoms and Datacoms installers.
• Specialist grounding/earthing companies and consultants.
• Petro-chemical companies
• Service providers
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