What voltage must metallic conductors be tested for stray voltages against ground?

Stray voltage testing for metallic conductors against ground is typically focused on identifying low levels of voltage that may affect safety and equipment performance. Testing at 1 volt is standard because at this level, it is possible to detect any unwanted voltage that could pose a risk or cause erroneous readings in electrical systems.

This lower voltage threshold allows for the identification of stray voltages that may not be harmful by themselves but could indicate issues in grounding or insulation that need to be addressed. Higher voltage levels could potentially create unsafe conditions during testing or may not accurately reveal the subtle presence of stray voltage related to electrical noise or imbalances in the grounding system.

Understanding this concept is crucial because it emphasizes the importance of maintaining low voltages during testing to ensure that equipment and personnel remain safe while diagnosing any grounding issues.