In what scenario is it most crucial to conduct an arc flash risk assessment?

Conducting an arc flash risk assessment is most crucial during the installation of new electrical systems because this phase involves the setup of equipment and circuits that have not yet been fully tested or verified for safe operation. New installations can introduce unforeseen hazards, as the configurations and protective devices are not yet fully understood or assessed in terms of possible arc flash energy levels. By performing a thorough risk assessment during installation, potential risks associated with arc flashes can be identified and mitigated, ensuring that safety measures are effectively integrated from the very beginning of the system's lifecycle.

Addressing the safety concerns inherent in new installations is vital because it sets the standard for safety protocols and equipment functioning in the future. It allows electricians and safety personnel to establish boundaries, safety signage, and personal protective equipment (PPE) requirements tailored to the specific risks associated with the new electrical system. This proactive approach significantly reduces the likelihood of accidents and ensures a safer working environment as the system is put into operation.