Is the anchor a better ground source than a temporary screw ground?

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The main idea here is choosing a grounding method that provides a reliable, low-impedance path to earth for safety during temporary work. An anchor ground tends to be less reliable because its electrical contact depends on soil conditions, depth, moisture, and whether the anchor remains tight and corrosion-free. These factors can change over time and with vibration or weather, causing the impedance to drift higher or become unpredictable. A temporary screw ground offers a more direct and verifiable earth contact that’s easier to install at a known depth and to test for continuity, so you can be confident the fault current will have a solid path to earth. It’s also easier to remove or reposition if the worksite changes, without leaving behind a weak or shifting bond. For these reasons, anchor grounds are considered the last option when establishing a temporary grounding path.