Testing an Earth/ground electrode is usually the final piece of the puzzle. Measuring the earth electrode’s resistance can verify and validate the design. The Earth measurement verifies that all the safety-critical calculations, assumptions and solutions made during the design phase match its predicted performance in the physical world.
Earth testing can easily introduce errors that very often go unnoticed.
Earth testing is usually called for towards the latter stages of a project build. Either to confirm a safe state for a system energisation or in order to get a project completed and handed over to the client/owner. In both scenarios, there’s usually a lot riding on the successful outcome of an Earth test. Mistakes made towards the final stages of any build can have a massive impact on reputations, nerves and relationships.
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