Arc flash is a dangerous phenomenon which transpires when an electrical fault causes a sudden release of energy in the form of heat, light, and sound. The same can be dangerous and can cause serious injuries, burns, or even fatalities. Therefore, it is imperative to have an action plan to mitigate the risks but more importantly one must understand the different levels of arc flash hazard categories. Additionally, it is important to implement preventive measures that should be taken based on the severity of the arc flash.
What is ARC flash?
To put in simply, ARC Flash is a short circuit that happens when there is a fault between two conductors, leading to the flow of an electrical current that produces extreme heat and intense light. Arc flash occurrence can result in fire breakouts, severe burns, and damage to electrical equipment. Such is the sudden and intense release of the energy that it can travel at mindboggling speeds and generate temperatures that can reach up to 35,000°F, which is hotter than the surface of the sun.
Arc flash hazard categories
Arc flash hazard categories have been classified based on the level of risk associated with different electrical systems. The National Fire Protection Association (NFPA) has set standards for the same which ranges from 0 to 4, based on the amount of energy released and the potential for injury.
- Arc Flash Hazard Category 0: The systems which are considered to be low risk are applied to this category. For such instances, the potential for an arc flash is minimal. Nevertheless, the workers a are highly advised to take basic precautions, such as using insulated tools and wearing protective gear.
- Arc Flash Hazard Category 1: Category 1 reflects a low level of risk wherein the incident energy is between 1.2 and 4 calories per centimeter squared. Workers who are to work whilst getting exposed to these systems should wear flame-resistant clothing to avoid injury in case of an arc flash.
- Arc Flash Hazard Category 2: For systems with a higher risk than category 1, this category is applied. The incident energy in category 2 is between 4 and 8 calories per centimeter squared. At this level, it becomes imperative for the workers to wear personal protective equipment (PPE) such as flame-resistant clothing, gloves, and face shields to protect themselves from burns.
- Arc Flash Hazard Category 3: In category 3 the incident energy levels range from 8 to 25 calories per centimeter squared. It must be noted that an arc flash of Category 3 is considered a significant risk. Hence, the workers must gear themselves up with a full arc flash suit, including a face shield, gloves, and an insulated jacket to minimize the potential for injury.
- Arc Flash Hazard Category 4: This is the highest level of risk, with incident energy above 25 calories per centimeter squared. Negligence in taking proactive measures for safety such as wearing full protective gear, including flame-resistant clothing, a face shield, gloves, and insulated boots could have disastrous outcomes. Therefore, the workers must follow the protocols of preventive measures are essential to prevent severe injury or death in the event of an arc flash.
Conclusion
Arc flash is a serious electrical hazard and it calls for careful attention and appropriate safety measures. If the workers are acquainted with the different arc flash hazard categories, it becomes convenient for them to determine the level of risk and the preventive actions required. The organizations too have the onus of implementing the right precautions, such encouraging the workers to use proper PPE, conducting risk assessments, and following safe work practices. This can significantly reduce the chances of an arc flash incident and ensure their safety in the workplace.
