This article was posted 06/19/2006 and is most likely outdated.

Pressures Developed by Arcs
 

 
Topic - Safety
Subject - Pressures Developed by Arcs

June 19, 2006  

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Pressures Developed by Arcs

 

In addition to flash burns resulting from electric arcs, people nearby an electric arc are propelled away from such arcs by pressure developed by the arcs. This can cause falls and other injuries as well as damage to nearby structures. In many cases, people that experience this pressure do not remember being propelled away from the arc, and sometimes do not even remember the arc occurrence itself.

 

Due to the relative infrequency of these power arcs, the interest in determining the nature and magnitude of this pressure has been minimal. Not only that, but the heat and molten metal droplet emanation from the arc causes serious burns to those nearby – overshadowing the interest in the rearward propulsion and pressures generated.

 

The following article discusses how these pressures develop and reviews case histories involving such occurrences. Click here to read the entire Pressures Developed by Arcs article produced by AVO Training Institute, Inc. The AVO Technical Resource Center provides electrical reference books, industry standards, training materials, personal protective equipment, insulated hand tools, and safety tools.

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Comments

  • In 1974 while I was stationed in the Navy at NAS Chase Iield Tx. I watched an Aviation Electrictrian Mate disconnected a MMG (Mobile Motor Generator) which converts 60Hz 480V 200A 3 Phase to 115/208V 400Hz and 28V DC at 100A. The Pin and Sleeve connector had 6 revolutions to remove it completely with a Safety Disconnect directly above the connector. The MMG Hums real loud while it is running and the MMG was on, the Jet was on both AC and DC when this electrician unscrewed the connector. The Arc Pressure wave lifted him off the floor and threw him over the 4ft high MMG then 20ft away. No burns , he didn't hit the MMG and he only had scrapes from his landing. I have applied the test and switch protocol ever since along with the Left hand rule. I was too far away across the hanger when this happened to get his attention yet I was witness to the whole evolution.

    Kid Stevens
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