๐๐ญ๐๐ฉ๐ฌ ๐ข๐ง๐ฏ๐จ๐ฅ๐ฏ๐๐ ๐ข๐ง ๐ฉ๐๐ซ๐๐จ๐ซ๐ฆ๐ข๐ง๐ ๐๐ซ๐ ๐๐ฅ๐๐ฌ๐ก ๐ฌ๐ญ๐ฎ๐๐ข๐๐ฌ ๐๐ฌ ๐ฉ๐๐ซ ๐๐๐๐ ๐๐๐๐-๐๐๐๐
,๐Determine Fault Currents:- Calculate the short-circuit currents at various points in the system. This step is critical as the magnitude of these currents will influence the severity of an arc flash
.๐Select Study Scenarios:- Identify different operating scenarios to analyze, which could affect arc flash incident energy levels, such as different settings of adjustable trip circuit breakers or changes in system configurations.
๐Incident Energy Calculations:- Calculate the incident energy levels at various points using the IEEE 1584 equations. These calculations consider factors like fault current, arc gap, and clearing time of protective devices.
๐Arc-Flash Boundary Determination:- Determine the arc-flash boundaries (the distance within which a person could receive a second-degree burn or worse if an arc flash occurred). This involves using the calculated incident energy to establish safe working distances.
๐Protective Device Coordination:- Analyze and adjust the timing of protective devices to minimize fault clearing times, which can help reduce incident energy levels and enhance safety.
๐Labeling:– Prepare and affix labels on electrical equipment to inform workers of the arc flash boundaries, incident energy at working distance, and required personal protective equipment (PPE).
๐PPE Assessment:– Specify appropriate personal protective equipment for workers based on the calculated incident energy levels. This ensures that workers are adequately protected based on the specific hazards at each part of the electrical system.
๐These steps, when followed diligently, help ensure that the electrical systems are evaluated accurately for arc flash hazards, and appropriate safety measures are put in place to protect workers.
