Typical Causes

Arc flash events most frequently occur when circumstances provide the electrical current with a way to complete the circuit that differs from the intended path. This could involve a dropped tool contacting conductors, accidentally touching an energized component, or residue providing a starting route for the short circuit.

Some of the more common causes of arc flash events include:

• Falling parts
• Material failure
• Dropped tools
• Accidental contact
• Faulty installation
• Use of substandard parts
• Condensation, water, or other liquids
• Corrosion
• Dust

Although these are known causes of this hazard, arc flash events can also occur when none of these conditions are present. Human error or carelessness account for the majority of arc flash incidents, such as distractions, fatigue, or bypassing personal protective equipment and other safety procedures. Worker alertness and understanding of safety precautions are vital when working with electrical equipment.

To learn more about Arc Flash Safety visit our OSHA Construction Arc Flash Safety Online Training web page.