Earthing is an integral part of any electrical installation. All electrical infrastructure requires adequate earthing to ensure protection from power system earthing faults. To ensure your installation meets safety regulatory requirements, testing of your earth grid is essential. You should always test your earthing arrangements before energization of construction works and at regular intervals for maintenance purposes to ensure degradation of the earthing system has not occurred.
Earth verification testing can include:
- Soil Resistivity Testing
- Earthing continuity testing of all metallic surfaces
- Earth grid testing
- Step and touch potentials
- Earth Potential Rise (EPR)
Whether your installation is new or existing, it is important to determine which tests are appropriate for each installation. A new installation for example will require a soil resistivity test prior to the design of the earthing grid. Once a design has been approved and the installation has been completed it is essential to confirm ground resistance through earth injection testing. This method ensures your earth potential rise (EPR) and step touch potential is adequate under fault conditions. Continuity tests of all electrical equipment and metallic surfaces must also be confirmed and resistances recorded.
For existing installations, it is important to confirm degradation of the earthing system has not occurred over the time of the installation. The earth grid must be confirmed with earth injection testing and earthing continuity tests. Any corrosion of earthing connections must be rectified and re-verified. Results must be compared to the requirements of the earthing design or if unavailable the Australian Standards must be referenced (AS/NZ 3000:2018).
If you require earth grid verification testing on your site, give us a call to arrange a free inspection and quote.