Kyoritsu · KEW 4105A
Kyoritsu KEW 4105A Digital Earth Resistance Tester
IP54 digital earth tester for 3-pole and 2-pole earth resistance to 1999 Ω and earth voltage to 200 V, with…
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Earth Resistance Testing
Verifying earth electrodes so that fault current flows safely to ground.
The problem
Earth electrodes corrode and soil dries out. A high earth resistance can stop protective devices operating and leave metalwork at dangerous voltages during a fault.
Measurement required
Earth electrode resistance by the 3-pole fall-of-potential method or a simplified 2-pole method, plus earth voltage before testing.
Instrument type
A digital earth tester with test leads and auxiliary spikes, conforming to IEC 61557-5.
Relevant Kyoritsu instruments
Listed because their documented specifications cover this measurement. Check the full specifications for your exact requirement.
3-pole and 2-pole earth resistance to 1999 Ω, earth voltage to 200 V.
How to choose
Check lead lengths, ranges, IP rating for outdoor use and whether you also need soil resistivity (4-pole) measurement.
Safety considerations
Beware of earth potential rise near faulted systems; check earth voltage before connecting, and follow site rules at substations.