Ground bound tester

A protective‑earth continuity tester is a device used to perform continuity tests under a high AC current, allowing verification of the earth circuits of an electrical device. The general rule applied is the “2 × In” rule, depending on various standards and regulations (EN, NF, UL, IEC, CSA, VDE…). Most tests are therefore carried out at 32A. A protective‑earth continuity tester injects a stable, high current (according to the 2 × In rule) into the object whose resistance is being measured, using the Kelvin method. This method eliminates parasitic resistance caused by the length of the measurement leads by measuring voltage as close as possible to the sample By applying Ohm’s law (R = U / I), the tester can determine the resistance with very high accuracy — down to the milliohm.