2-and-3 Wire Earth Ground Resistance Tester - Measures Earth Ground Resistance from 20Ω to 2000Ω - (EG480)

The Triplett Model EG480 can measure 2- and 3-wire Earth Ground Resistance (in 3 ranges) and Earth Voltage (200V), plus multimeter functions AC/DC Voltage and Resistance (200kΩ). Additional features include: Dual LCD display with backlight, Data Hold, Auto power off, and a low battery indicator. CAT III 1000V safety category. Includes test leads, (2) auxiliary earth rods, (6) AA batteries, and carrying case. 1-year warranty.

EG480-NIST Comes with Certificate of traceability to NIST standards 
Please add 11 business days lead-time for the NIST calibration process

• Measures earth ground resistance from 20Ω to 2000Ω
• Dual LCD display with backlight
• Multimeter functions: AC/DC Voltage and Resistance
• Data Hold freezes reading on the display
• Auto power off and low battery indicator
• Overmolded housing for added durability
• Complete with protective holster, test leads, (2) auxiliary earth rods, (6) AA batteries, and carrying case
• Optional model complete with Certificate of Traceability to N.I.S.T.
• 1 year warranty
• Lead time for NIST Certified products is 5-7 business days
• Upon order placement, please provide the company name that should appear on the certificate.  Without this information, we will not be able to provide a certificate of calibration.

Datasheet

User Manual

• Q. What is a ground resistance tester, and what is its primary function?
  A. A ground resistance tester, also known as an earth ground tester, is an instrument designed to measure the electrical resistance of the grounding system in various applications. Its primary function is to ensure that grounding systems are effective in safely dissipating electrical faults and preventing electrical hazards.

• Q. What does a ground resistance tester measure, and how does it work?
  A. Ground resistance testers measure the electrical resistance of the ground electrode, grounding conductors, and the soil they are connected to. They work by injecting a known current into the ground and measuring the resulting voltage drop to calculate resistance.

• Q. Where are ground resistance testers commonly used?
  A. An earth ground is used as a zero-volt reference point for power substations, buildings, communication towers, and as a path to dissipate lightning strikes to prevent damage to them.

• Q. How do I interpret the results of a ground resistance test?
  A. Ground resistance is typically measured in ohms (Ω). The goal is to achieve low resistance values to ensure efficient dissipation of electrical currents into the ground. The NEC (National Electrical Code) requires that a single path to ground should be 25 ohms or less. If it is higher than 25 ohms, you should add an additional ground rod 6 feet away. The earth ground resistance tester provides an easy way to check this reading in installed systems or for a good location to install a new system.