Arc Flash Studies consist of gathering electrical system site data and compiling the results, in order to determine the level of incident energy within certain boundaries at a piece of equipment, as well as the personal protective equipment (PPE) required to be worn by those working on or maintaining such equipment. These values are reflected in the arc flash labels provided at each piece of system equipment studied. The arc flash hazard analysis incorporates and starts with the incoming short circuit data procured from the local utility company.
What Is an Arc Flash?
An arc flash is a sudden release of electrical energy through the air caused by a fault (such as a short circuit). It can result in:
- Extreme heat (up to 35,000°F / 19,400°C)
- Pressure waves (arc blasts)
- Shrapnel from exploded components
- Blinding light and sound
Purpose of an Arc Flash Study
The goal is to:
- Identify potential arc flash hazards
- Determine incident energy levels at various points in the system
- Define arc flash boundaries
- Specify PPE levels required for workers
- Enhance overall electrical safety
How Often Should it Be Done?
Every 5 years (per NFPA 70E)
Or whenever major system changes are made (e.g., new panels, transformer upgrades)
Benefits of an Arc Flash Study
- Worker safety
- OSHA/NFPA compliance
- Reduces downtime by identifying unsafe conditions
- Informs safe work practices
- Optimizes PPE use (avoids over- or under-protection)
Infra-Red Building and Power Systems has been engineering Arc Flash Studies for many years, providing clients with guidelines for safety in challenging conditions.