What Is an Arc Flash?
An arc flash is a sudden release of heat and light caused by an electrical arc. The arc occurs when electric current travels through air between conductors or to a grounded surface. An arc flash can damage electrical equipment and expose nearby people to burns and other injuries.
Quick Facts About Arc Flash
- Category
- Electrical hazard
- Applies to
- Energized electrical equipment
- Common confusion
- Electric shock
- Often discussed with
- Commercial Electrical Repair, Electrical Panel Repair
Key Takeaways About Arc Flash
- The arc travels through air rather than along its intended path.
- Equipment condition affects the risk during electrical work.
- An arc flash is different from an electric shock.
How Arc Flash Works
An arc flash starts when current crosses a gap in an unintended path. A loose connection, damaged insulation, or a dropped tool can create conditions for an arc. The arc heats the surrounding air and metal.
Related glossary terms: Circuit Breaker, Electrical Short, Breaker Panel.
The energy released depends in part on the available fault current and how long the arc lasts. A circuit breaker may interrupt the current, but an arc can still release energy before the breaker opens. An enclosure can also affect how that energy reaches the area around the equipment.
An arc flash differs from electric shock. Shock involves current passing through a person's body. An arc flash can injure someone nearby without direct contact with a conductor. The same electrical fault can involve both hazards.
From the Chris Miller Electric team
When we assess commercial electrical repairs, we look at equipment condition and the work needed. A damaged panel may need a different work plan than a faulty light switch. We also consider how the equipment can be placed in an electrically safe condition before work.
Arc Flash in Practice: A Real-World Example
A damaged connection inside a commercial breaker panel creates a path for current through the air. The resulting arc flash damages nearby panel parts during a repair assessment.
Related Terms
Circuit Breaker
A circuit breaker is a protective device that shuts off electrical current when a circuit draws too much current.
Electrical Short
An electrical short is a fault that lets current follow an unintended path with little resistance.
Breaker Panel
A breaker panel is an electrical enclosure that directs power to circuits throughout a building.
Ground Fault
A ground fault is an electrical fault that sends current onto an unintended path to ground.
Chris Miller Electric
Have Questions About Arc Flash?
Contact Chris Miller Electric for practical guidance on Arc Flash and related 24 hour electrician work in Fort Wayne.