Which statement is true regarding arc-flash hazard assessments?

The accurate statement regarding arc-flash hazard assessments is that first, one must determine the available current. This step is crucial as it helps in evaluating the potential energy released during an arc-flash event. By assessing the available current, one can better understand the flash protection boundary and the potential severity of an arc-flash incident. This initial data assists in performing further calculations, such as determining incident energy and selecting appropriate personal protective equipment (PPE) for individuals that may work around those electrical systems.

The process of determining available current is foundational, as it enables the development of a comprehensive arc-flash study that aims to safeguard workers and facilities. Conducting such assessments is less about sheer periodicity, as implied in the option about conducting assessments every five years, and more about the specific needs based on the systems in use and any changes made to the electrical distribution. Additionally, low-voltage systems can still present arc-flash hazards, and proper calculations are indeed essential for accurate assessments, making those assertions invalid.