Electric Arc: Protecting Against Thermal Effect - Part 2: Fundamentals of Protection
- Mikhail Golovkov (consultant) | Holger Schau (Ilmenau Technical University) | Gavin Burdge (writer)
- Document ID
- American Society of Safety Engineers
- Professional Safety
- Publication Date
- August 2017
- Document Type
- Journal Paper
- 39 - 45
- 2017. American Society of Safety Engineers
- 0 in the last 30 days
- 24 since 2007
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- This series of three articles provides a broad overview of today’s state of the art for protecting electrical workers against electric arc thermal hazard.
- Part 2 identifies thermal and other hazards of an electric arc, and provides an overview of protection fundamentals of electricarc- rated PPE.
- It also offers an analysis of previously published electric arc incidents from the perspective of electric arc type.
Part 1 of this series of articles identifies electric arc classification, properties, behavior and methods of thermal energy dissipation among the different types of arcs, and factors for the future progress in electric-arc-rated (AR) PPE quality and reliability. Understanding the properties and behaviors of the different possible types of electric arcs is key to assessing AR PPE.
New knowledge of electric arc classification is helpful not only in current arc incident investigation but also in better understanding past arc incidents. Analysis of specific electric arc incidents is complemented with extensive research on electrical trauma trends based on government data. Part 2 of this series addresses arc hazards, protection fundamentals, and data on electrical fatalities and arc burn trauma.
Fundamentals of Electric Arc Protection
Electric Arc Hazards
Electric arc hazards are not limited to the thermal effect. Large amounts of thermal energy released in the electric arc event is also accompanied by extremely bright light flash, momentary and residual flames, heavy smoke and poisonous fumes, loud sound and molten metal droplets. Pressure waves and flying projectiles are also likely as a result of air pressure build-up with cabinet rupture due to the extreme pressure from arcing inside the enclosed cabinet.
All kinds of AR PPE are first and foremost designed and tested to protect the body, hands, face and head from thermal effects. AR PPE may provide supplementary protection against light flash, molten metal and projectiles, but it provides limited protection against smoke, sound and chronic effects from stress caused by the arc event.
|File Size||666 KB||Number of Pages||7|