determine the likelihood of an arc flash, and the injuries it may cause.What elements should be considered when doing an arc flash risk assessment? Back to topĪn arc flash risk assessment should be done to: The possibility of an arc flash increases when there are exposed energized electrical conductors or circuit parts or when safe work procedures are not followed. Incorrect installation of arc-resistant equipment.Incorrect installation of conductors, such as when conductors of different phases are installed too close.Dust and condensation on the insulating materials (The dust or moisture provide a path for the electrical current and can lead to flashovers that create an arc discharge).Equipment failure due to poor maintenance or improper design.A tool dropped on the ground, which creates a spark which starts an arc discharge.Unintentional tool contact with live parts.The pressure wave can also cause damage to hearing or the brain.Īn arc flash may be caused by many factors or events, such as: Droplets of melted material and fragments of damaged equipment are spread by the blast at far distances at speeds fast enough for the items to penetrate the body. The blast will cause falls and impact injuries. The heat can cause severe burns which can be fatal. What are the hazards related to arc flash? Back to top In addition, an arc flash will create an arc blast - the heated air expands suddenly and creates a powerful pressure wave (a blast). At these high temperatures, items within a metre (3 feet) such as clothing and skin will catch fire, melt, or vaporize. Arc flash refers to the flash of light and heat that is created when energy is released between a live conductor and another conductor or the ground.ĭuring an arc flash, the energy released heats the air to extreme temperatures such as almost 20 000 ☌ (35 000 ☏).
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