What benefit was observed when using a bonded conductive mat to create an equipotential zone during the tests?

The benefit observed when using a bonded conductive mat to create an equipotential zone is that the voltage across the worker remained low. This occurs because the mat helps to distribute electrical potential uniformly across its surface, minimizing voltage differences that could lead to dangerous shock hazards. By ensuring that all points within the area of the mat are at roughly the same electrical potential, it significantly reduces the risk of electric shock to workers who may be in contact with different conductive surfaces within the zone.

In this context, creating an equipotential zone is crucial for worker safety in environments where high-voltage equipment is present. This is particularly important in substations and similar electrical installations, where workers might be required to perform maintenance or inspections in close proximity to high-voltage systems. A low voltage across the worker ensures that even if there is some conductive path, there is not a significant potential difference that could cause harm.

The other options did not accurately capture the implications of using the bonded conductive mat: the area does not become entirely safe as other risks may still be present, no voltage detection does not reflect the purpose of the mat, and an increase in voltage levels contradicts the primary objective of maintaining safety through voltage control. Thus, maintaining a low voltage across the worker is the essential benefit