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How does ground impedance affect the performance of a surge suppressor?

April 26, 2017affect ground impedance PERFORMANCE suppressor surge

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How does ground impedance affect the performance of a surge suppressor?

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A faulty or high impedance grounding system can render a TVSS system ineffective. Most grounding installations of critical equipment call for the grounding system impedance to be 5-10 ohms or less. The NEC calls for a grounding system of 25 ohms or less in Article 250.56.