Abstract
The arc flash is one of the main hazards that electrical energy presents. Due to its importance, arc flash research has focused on Alternating Current (AC) electrical systems. However, a considerable increase in Direct Current (DC) systems has been observed, particularly in integrating new technologies such as generation with non-conventional energy sources, electric vehicles, and energy storage systems. Direct Current (DC) installations are exposed to the same dangerous situations as Alternating Current (AC) installations, so that no electrical installation can guarantee an arc flash-free situation. In this paper, calculations required to estimate the incident energy in AC and DC systems are methodologically described under guidelines established by the most current standards: IEEE Guide for Performing Arc-Flash Hazard Calculations of 2018 and NFPA E70 Standard for Electrical Safety in the Workplace of 2021. This work uses a case study of a hospital facility on the Island of San Andrés, Colombia.
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