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Best practices for conducting an arc flash risk assessment

The Arc flash risk assessment is carried out to prevent the risks that are associated with the occurrence of an Arc flash OSHA has published some guidelines for the security and safety of employees at the workplace, especially when working at the hazardous electrical equipment where there is a high probability of electric or Arc flashes. There are many Practices in Arc flash risk assessment each consultant follows their own way of analyzing and assessing the risks of arc flashes. There are some of the major areas where the constant updating is necessary to evict the hazardous effects of arc flashes. The Arc flash short circuit calculation is one of fundamental that prerequisites the categories proposed by the NFPA 70E to analyze the arc flash intensity and the category. The Arc flash risk categories as per NFPA are classified into 5 types they are:

Ø  HRC 0 - A minimum arc rating of PPE at Zero. Only a Single layer of cotton clothing is required to meet up the standards

Ø  HRC 1 – A same layer of protection is required with an arc rating of  4 calories per square centimeter

Ø  HRC 2 – Additional flame resistant clothing or equipment is required as the arc rating would be around 12 calories

Ø  HRC 3 – A 25 calorie of an arc rating requires safety goggles, leather shoes, insulated gloves, 4 layers of above-mentioned clothing standard is required to meet up with OSHA compliance

Ø  HRC 4 – A 40 calorie of arc rating of PPE and an Arc flash suit including 4 layers of clothing.

These are the Arc flash hazard categories that would be analyzed to decide the respective PPE at the equipment to meet up the risk and rescue the lives of employees endangered to it.

The Arc flash warning labels are one of the least concentrated assessments which could highly prevent as they signal the effect of hazard. It must contain the warning symbol specifying the PPE as per the analysis and category. If this is concentrated the personnel would be aware of the situation prior to related equipment to overcome the calamity.  

The final concentration should be on calculating the boundary associated with arc flash risk the NFPA has formulated and decided 3 categories of boundaries  i.e,  Limited         (shock            hazard            exist),

Restricted(increased risk) and Prohibited the inner boundary of the point of contact where the intensity is maximum. These are the minute areas of analysis that are to be focused to prevent major risk due to Arc flashes and to save lives.

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