Arc flash boundary 20183/11/2024 ![]() The IE, typically expressed in calories per square centimeter (cal/cm 2) is a quantitative evaluation of the severity of an Arc Flash and can be used in a formal risk assessment process. This is the distance from the arc to the worker's head and torso, which are the areas of the body most at risk from severe burns. ![]() ![]() The IE is determined at a specified distance away from the arc itself - this is called the Working Distance. A recognised methodology is used to calculate the thermal energy that someone working on the equipment will be subjected to during the incident – this is called the Incident Energy (IE). Intense light (particularly UV) and a deafening soundĪn Arc Flash Study focuses on the heat energy released during an arc flash incident.Release of debris, shrapnel and superheated ionised gases.Rapid vaporisation and expansion of copper.What are the potential consequences of an arc flash event?Īn Arc Flash incident that occurs on live electrical equipment is a highly energetic event that has the potential to produce numerous effects which can cause serious injury or death as well as equipment damage. We'll cover determining likelihood in a future article as this is usually a separate piece of work to understand how electrical equipment is used, how often people interact with it, and its condition, amongst other considerations. the likelihood of that incident occurring.Ĭompleting an Arc Flash Study is the best option for quantitatively assessing the potential severity of an Arc Flash incident.the potential severity of an incident, and.The arc flash risk can be assessed by considering two factors: This risk assessment should take into account all of the recognised hazards associated with electricity, including arc flash. The United Kingdom's Electricity at Work Regulations 1989 and supporting guidance calls for suitable and sufficient risk assessment to be completed when working on or near live electrical equipment. What is an Arc Flash Study? In this article we look at why an Arc Flash Study is useful, how it is carried out and what the outputs are How is the risk posed by arc flash determined?
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