Most facilities have grounded electrical systems, so that
in the event of a lightning strike or utility overvoltage,
current will find a safe path to earth. A ground electrode
provides the contact between the electrical system and the
To ensure a reliable connection to earth, electrical codes,
engineering standards, and local standards often specify a
minimum impedance for the ground electrode. The international
Electrical Testing Association specifies ground electrode
testing every three years for a system in good condition with
average up-time requirements.
The Fluke Earth Ground Testers can perform all four types
of earth ground measurement, including stakeless testing with
earth ground loop resistance using only clamps.