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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Kyoritsu Earth Testers
An earth tester measures the resistance between an earth electrode and the surrounding soil. A low, stable earth resistance lets fault current flow safely, so protective devices operate and exposed metalwork stays at a safe voltage.
Kyoritsu earth testers use a small test current and auxiliary spikes to measure earth resistance directly at the electrode.
How earth resistance is measured
3-pole (fall-of-potential) method. Two auxiliary spikes are driven into the ground in a straight line from the electrode under test, typically 5–10 m apart. The tester passes current between the electrode and the far spike and measures voltage at the middle spike. This is the precision method.
2-pole (simplified) method. Where spikes cannot be driven, the tester measures between the electrode and an existing low-resistance earth, such as a water pipe. It is quicker but includes the resistance of the reference earth.
Earth voltage. Stray voltage on the earth system affects readings. Testers that measure earth voltage first let you judge whether a measurement is valid.
Choosing a tester. Check the ranges you need, the leads and spikes included, the IP rating for outdoor use and conformity to IEC 61557-5. For soil resistivity surveys you need a 4-pole tester.
Related applications
- Earth Resistance TestingVerifying earth electrodes so that fault current flows safely to ground.
- Electrical Safety TestingVerification tests on installations: continuity, insulation, earth and RCD.
- Field Electrical TestingPortable, rugged instruments for site and outdoor work.
Questions about earth testers
What is an acceptable earth resistance?
Acceptable values depend on the installation type, the earthing system and the applicable standard or utility requirement. Check the design documents and local regulations rather than a single figure.
How far apart should the spikes be?
Follow the instrument manual. For the KEW 4105A the supplied leads are 20 m, 10 m and 5 m, which set the spacing for the 3-pole method.
Related categories
- Digital Multimeters
- Clamp Meters
- Power Clamp Meters
- Insulation Testers
- RCD Testers
- Phase Indicators
- Voltage Testers & Detectors
Looking for another brand of earth tester? Our multi-brand site IndiaMeters covers other manufacturers.