Ground testing is typically performed in two stages. The first is conducted during the construction of a building to ensure proper installation of the electrical system. And the second involves routine ground testing to ensure the ‘actual’ arrangements perform as ‘predicted’ at the design stage. Thus, to avoid costly and fatal errors.
Electrical earth testing can be a real challenge in built-up areas. Not only are there very few soft areas to deploy the test probes, but underground cabling and conductive structures are everywhere. These two factors massively affect the measured readings leading to measured values that bear no relation to the actual electrode tested. Therefore, what follows is the Earth Testing Procedure Greymatters adopts.
Follow the guidance in HSG47. The city or town’s infrastructure produces large amounts of in-ground noise and interference. Mitigation by reading buried service/cable records; observing signs of previous excavations; and use a cable avoidance tool (CAT) can make sense of where the structures are.[Read more…] about Earth Testing Procedures in Urban Environments