Kyoritsu 4105A Digital Earth Resistance Tester
The Kyoritsu KEW 4105A Digital Earth Resistance Tester is a portable instrument designed for accurate measurement of earth resistance and earth voltage in electrical grounding systems. It supports both 2 wire and 3 wire earth resistance testing, measures earth resistance up to 1999 ohms, and measures earth voltage up to 200 V AC. With IP54 protection and CAT III 300 V safety compliance, it is suitable for electricians, electrical contractors, maintenance engineers, industrial plants, and grounding system inspection.
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A. Product Overview
The Kyoritsu KEW 4105A Digital Earth Resistance Tester is designed for checking the condition and effectiveness of electrical earthing systems.
A reliable grounding system is essential for electrical safety, equipment protection, and proper operation of protective devices. The KEW 4105A allows technicians to measure the resistance between an earth electrode and the surrounding ground.
The instrument supports both conventional 3 wire earth resistance measurement and simplified 2 wire measurement, allowing it to be used across different electrical installations.
Key characteristics include:
- Earth resistance measurement up to 1999 ohms
- Earth voltage measurement up to 200 V AC
- Support for 2 wire and 3 wire testing
- Clear digital LCD display
- IP54 protection against dust and water splashes
- CAT III 300 V safety rating
- Portable construction for field testing
- Suitable for grounding, earthing, and electrical maintenance applications
B. Working Principle
The Kyoritsu KEW 4105A measures earth resistance by passing a controlled test current through the grounding system and measuring the resulting voltage.
Using these measured values, the tester calculates the earth resistance.
For a standard 3 wire earth resistance test, the instrument works with the earth electrode under test and auxiliary earth spikes placed in the ground.
The tester applies a test signal between the earth electrode and an auxiliary electrode. It then measures the voltage through another auxiliary electrode.
The instrument calculates resistance according to the basic electrical relationship:
Resistance = Voltage divided by Current
The resulting earth resistance value is displayed directly on the LCD screen.
For suitable installations, the instrument can also perform simplified 2 wire earth resistance measurement using an existing grounding reference.
The earth voltage function allows the user to check whether unwanted AC voltage is present in the grounding system before or during testing.
C. Why It Is Used
The Kyoritsu KEW 4105A is used to determine whether an electrical grounding system has sufficiently low resistance for safe and reliable operation.
High earth resistance can reduce the effectiveness of the grounding system and may indicate poor soil contact, damaged electrodes, loose connections, corrosion, or deterioration of the earthing installation.
Typical applications include:
- Earth pit resistance measurement
- Grounding electrode testing
- Electrical installation inspection
- Preventive electrical maintenance
- Industrial earthing system testing
- Building grounding inspection
- Electrical panel earthing verification
- Lightning protection grounding checks
- Maintenance of electrical substations and distribution systems
- Troubleshooting high earth resistance
- Commissioning of new electrical installations
- Periodic inspection of existing grounding systems
Regular earth resistance testing helps maintenance teams identify deterioration before it develops into a serious electrical safety or reliability issue.
D. Suitable Buyers
The Kyoritsu KEW 4105A Digital Earth Resistance Tester is suitable for:
Electrical Contractors
For testing grounding systems during electrical installation, commissioning, and maintenance work.
Electricians
For checking earth pits, grounding electrodes, and electrical earthing systems.
Electrical Maintenance Engineers
For periodic inspection of industrial grounding systems and troubleshooting abnormal earth resistance.
Industrial Plants
Suitable for factories, manufacturing units, process plants, utilities, and industrial electrical installations.
Facility Management Companies
For routine grounding checks in commercial buildings, hospitals, hotels, offices, malls, and institutional facilities.
Electrical Testing Companies
For professional inspection, commissioning, and electrical safety testing.
Panel Builders and System Integrators
For verifying grounding conditions during installation and commissioning.
Solar Installation Companies
For checking grounding systems associated with solar power installations and electrical distribution equipment.
Telecom and Infrastructure Contractors
For testing grounding systems used with communication equipment, towers, electrical cabinets, and infrastructure projects.
Government and Utility Departments
Suitable for electrical maintenance, inspection, distribution, infrastructure, and grounding system testing.
Frequently Asked Questions
1. What is the Kyoritsu KEW 4105A used for?
The Kyoritsu KEW 4105A is used for measuring earth resistance and earth voltage in electrical grounding systems.
2. What is the maximum earth resistance range of the KEW 4105A?
The KEW 4105A can measure earth resistance up to approximately 1999 ohms.
3. Can the Kyoritsu 4105A measure earth voltage?
Yes. It can measure earth voltage up to approximately 200 V AC.
4. Does the KEW 4105A support 3 wire earth testing?
Yes. The tester supports conventional 3 wire earth resistance measurement using auxiliary earth electrodes.
5. Can the Kyoritsu KEW 4105A perform 2 wire testing?
Yes. It also supports simplified 2 wire earth resistance measurement for suitable applications where an appropriate grounding reference is available.
6. What is the difference between 2 wire and 3 wire earth testing?
The 3 wire method uses auxiliary earth electrodes and is commonly used for dedicated earth resistance measurement.
The 2 wire method is a simplified measurement method that uses an existing suitable earth reference.
7. Is the Kyoritsu KEW 4105A suitable for earth pit testing?
Yes. Earth pit and grounding electrode resistance measurement are among its common applications.
8. What does earth resistance indicate?
Earth resistance indicates how effectively an earth electrode or grounding system can conduct electrical current into the ground. Lower resistance generally indicates a more effective grounding connection.
9. Why should earth resistance be measured regularly?
Grounding performance can change because of soil conditions, corrosion, damaged conductors, loose connections, ageing electrodes, and environmental conditions. Periodic testing helps identify deterioration.
10. What is the IP rating of the Kyoritsu KEW 4105A?
The instrument has an IP54 protection rating, providing protection against limited dust ingress and water splashes.
11. What is the safety category of the KEW 4105A?
The Kyoritsu KEW 4105A is rated CAT III 300 V.
12. Can the KEW 4105A be used in industrial plants?
Yes. It is suitable for industrial electrical systems, manufacturing plants, control installations, distribution systems, and maintenance applications.
13. Can this tester be used for preventive maintenance?
Yes. Periodic earth resistance measurement can help identify grounding deterioration before it causes equipment or electrical safety problems.
14. Who should use the Kyoritsu KEW 4105A?
It is suitable for electricians, electrical engineers, maintenance teams, contractors, facility managers, testing professionals, system integrators, utility personnel, and industrial maintenance departments.
15. Is the Kyoritsu KEW 4105A suitable for new installation commissioning?
Yes. It can be used to verify grounding system resistance during commissioning of new electrical installations.
16. Can the KEW 4105A help troubleshoot poor grounding?
Yes. Abnormally high earth resistance readings can help technicians identify possible problems with earth electrodes, connections, soil contact, or the overall grounding system.