07/03/2023
EARTH GROUND TESTING – REDUCING THE RISK OF EQUIPMENT FAILURE
6TH MAR 2023 ERIKA VAN ZYL (Electrical Contractors Association)
Poor grounding not only increases the risk of equipment failure; it is dangerous. Facilities need to have adequately grounded electrical systems so that in the event of a lightning strike, or utility overvoltage, current will find a safe path to earth.
Simple grounding systems consist of a single ground electrode driven into the ground. The use of a single ground electrode is the most common form of grounding and can be found outside homes or places of business.
Complex grounding systems consist of multiple ground rods; connected mesh or grid networks; ground plates; and ground loops. These systems are typically installed at power-generating substations, central offices, and cell tower sites.
Why test?
Over time, corrosive soils with high moisture content, high salt content, and high temperatures can degrade ground rods and their connections. So, although the ground system when initially installed had low earth ground resistance values, the resistance of the grounding system can increase if the ground rods are eaten away.
It is recommended that all grounds and ground connections be checked annually as a part of your normal predictive maintenance plan.
If the technician finds an increase in resistance of more than 20 percent, investigate the source of the problem and make the correction to the grounding system to lower the resistance.
Our fees for earth checking and issue new COC on spike:
R550
Replacing earthrod and brackets:
EARTH SPIKE 1.5M R220
EARTH SPIKE CLAMP + BOLT 12-16MM
R40