Why Are Grounding Testing and Periodic Inspection Critical in Industrial Facilities?

Grounding testing is critical because the reliability of a grounding system that has not been tested is simply unknown. During a fault, the grounding system carries the fault current safely into the earth, protecting personnel against electric shock and limiting damage to equipment. Yet grounding is not a system that can be considered reliable simply because it worked on the day it was installed: seasonal changes in soil resistivity, corrosion, mechanical damage and modifications to the facility can degrade its performance over time.

In industrial plants, this risk is amplified. Fault levels are higher, there are more metal structures, cable routes and equipment frames to bond, and production lines are frequently rearranged. A grounding system that met the limits at commissioning may no longer do so after a new production line, a substation extension or years of corrosion, which is why its reliability is only as good as its latest test.

Grounding resistance is measured with a calibrated ground resistance tester (often called an earth megger in the field). In open areas, methods using auxiliary test stakes, such as the fall-of-potential (three-point) method, are used, while at in-plant points where test stakes cannot be driven, clamp-on (stakeless) testers are used instead. The results are evaluated together with the type of grounding installation, the protection scheme and the limit values in the applicable regulations; in Türkiye, the main reference is the Regulation on Grounding in Electrical Installations.

Measurement alone is not enough; the continuity of equipotential bonding bars, protective conductors and joints must also be checked. A loose grounding connection may fail to provide the expected protection during a fault, even if the measured resistance value looks acceptable.

A thermal inspection with an infrared camera reveals, under load, risks that are invisible to the naked eye. Loose terminal connections, overloaded cables, unbalanced phase loading and aging contacts show up as temperature rises before they turn into failures. Periodic thermal scans inside panels and at busbar connections are among the most effective ways to prevent unplanned shutdowns and panel fires.

For meaningful results, scans should be carried out while the equipment is carrying a representative load, and hot spots should be compared with similar components operating under the same conditions. Thermal findings are most valuable when they are recorded with images and locations so that the same points can be rechecked after corrective work.

An effective periodic inspection program rests on three elements: a test plan that defines the measurement points, a schedule aligned with the intervals set out in the regulations, and reporting discipline that allows results to be compared over the years. Comparing each result with previous measurements makes degradation trends visible that a single measurement cannot show. It is equally important for the facility to archive reports in a form that can be presented during audits, dated and with the test instrument details recorded.

At Miratek Elektrik, testing and commissioning is not a formality added at the end of a project but an integral engineering phase of the work. Grounding resistance measurements, insulation and continuity tests, functional checks and thermal scans are performed with calibrated instruments, reported and handed over to the client. Drawing on more than 15 years of field experience and 1,300+ completed projects, we carry the same discipline into the operating phase, providing periodic testing and inspection services to industrial facilities across Türkiye to keep their electrical infrastructure reliable over time.