Arc Flash injuries

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[h=1]Electricians remain critical after San Jose fire[/h]By John Woolfolk

jwoolfolk@mercurynews.com

Posted: 02/28/2013 06:45:30 AM PST
Updated: 02/28/2013 06:45:36 AM PST

SAN JOSE -- Two electricians badly burned in a weekend industrial accident remained in critical condition Wednesday while investigations continued into the circumstances surrounding the explosion of an electrical panel in north San Jose.
San Jose Fire Capt. Rob Brown said the cause of the fire at an industrial building at 71 Daggett Drive remained under investigation. Authorities have not identified the injured electricians, but Brown said one suffered burns over 65 percent of his body and the other over about 30 percent of his body and that both remained in critical condition at Santa Clara Valley Medical Center's burn unit.
The men were working on an electrical panel when it flashed or exploded about 9 a.m., severely burning them. There were no other injuries or damage to the rest of the property.
Greg Siggins, spokesman for the California Division of Occupational Safety and Health, said the state agency is continuing an investigation of the two men's employer, JAE Electric of Santa Clara, which could take six months to complete.
Siggins cautioned that such investigations are standard in industrial accidents.
"The investigation will run its course, and if it finds violations of labor law, they will be cited," Siggins said.
JAE Electric did not respond to a phone call Wednesday afternoon seeking comment.
It remained unclear who controlled the property where the two men were working.
Although technology company
Finesse Solutions had announced a move to that address in 2009, company representative Herb Burkard said Wednesday that Finesse left the Dagget Drive property in July for a new address on Leonard Court in Santa Clara and no longer had any involvement with the San Jose site at the time of the accident.

 

bobbymari

Senior Member
Location
los angeles ca
[h=1]Electricians remain critical after San Jose fire[/h]By John Woolfolk

jwoolfolk@mercurynews.com

Posted: 02/28/2013 06:45:30 AM PST
Updated: 02/28/2013 06:45:36 AM PST

SAN JOSE -- Two electricians badly burned in a weekend industrial accident remained in critical condition Wednesday while investigations continued into the circumstances surrounding the explosion of an electrical panel in north San Jose.
San Jose Fire Capt. Rob Brown said the cause of the fire at an industrial building at 71 Daggett Drive remained under investigation. Authorities have not identified the injured electricians, but Brown said one suffered burns over 65 percent of his body and the other over about 30 percent of his body and that both remained in critical condition at Santa Clara Valley Medical Center's burn unit.
The men were working on an electrical panel when it flashed or exploded about 9 a.m., severely burning them. There were no other injuries or damage to the rest of the property.
Greg Siggins, spokesman for the California Division of Occupational Safety and Health, said the state agency is continuing an investigation of the two men's employer, JAE Electric of Santa Clara, which could take six months to complete.
Siggins cautioned that such investigations are standard in industrial accidents.
"The investigation will run its course, and if it finds violations of labor law, they will be cited," Siggins said.
JAE Electric did not respond to a phone call Wednesday afternoon seeking comment.
It remained unclear who controlled the property where the two men were working.
Although technology company
Finesse Solutions had announced a move to that address in 2009, company representative Herb Burkard said Wednesday that Finesse left the Dagget Drive property in July for a new address on Leonard Court in Santa Clara and no longer had any involvement with the San Jose site at the time of the accident.


similar just happend to my buddy last month, not as serious but enough to remind us all how serious this is. He removed a deadfront of an old zinsco bolt on panel. Heard a loud buzzing on a singlepole 20 amp 120v breaker and stepped back just as it exploded, yes exploded. Second degree burns on both hands all the way up to his elbows. Lucky he stepped back or it wouldve been his face. Be careful out there fellas!!!!!!
 

don_resqcapt19

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Location
Illinois
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retired electrician
... He removed a deadfront of an old zinsco bolt on panel. Heard a loud buzzing on a singlepole 20 amp 120v breaker and stepped back just as it exploded, yes exploded. Second degree burns on both hands all the way up to his elbows. Lucky he stepped back or it wouldve been his face. Be careful out there fellas!!!!!!
Just another example of why we need to be using PPE for tasks that are done every day without PPE.
 

spark master

Senior Member
Location
cyberspace
similar just happend to my buddy last month, not as serious but enough to remind us all how serious this is. He removed a deadfront of an old zinsco bolt on panel. Heard a loud buzzing on a singlepole 20 amp 120v breaker and stepped back just as it exploded, yes exploded. Second degree burns on both hands all the way up to his elbows. Lucky he stepped back or it wouldve been his face. Be careful out there fellas!!!!!!

Would you consider that an arc flash, or just a rare breaker failure?
I've never seen a 20 amp breaker explode.
 

spark master

Senior Member
Location
cyberspace
I consider an arc flash happening from a short. phase to phase, or phase to ground.
I can't imagine a breaker shorting, unless it melts against the buss bars.
 

GoldDigger

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Location
Placerville, CA, USA
Occupation
Retired PV System Designer
I consider an arc flash happening from a short. phase to phase, or phase to ground.
I can't imagine a breaker shorting, unless it melts against the buss bars.

If the breaker to bus connections or the contacts within the breaker, or the load to breaker connection opened under load in a way not designed for, you could have a series arc fault. Very limited energy compared to a parallel fault, but for a big breaker it could also affect the internal components enough to trigger a parallel arc fault (~short), especially in a multi-pole breaker.
From your position in front of the panel, you don't really care what the initiating event was, just the result.
The people investigating afterward will probably care though.
 

scottmarston

Member
Location
Meridian, ID
Electricians remain critical after San Jose fire

By John Woolfolk

jwoolfolk@mercurynews.com

Posted: 02/28/2013 06:45:30 AM PST
Updated: 02/28/2013 06:45:36 AM PST



SAN JOSE -- Two electricians badly burned in a weekend industrial accident remained in critical condition Wednesday while investigations continued into the circumstances surrounding the explosion of an electrical panel in north San Jose.
San Jose Fire Capt. Rob Brown said the cause of the fire at an industrial building at 71 Daggett Drive remained under investigation. Authorities have not identified the injured electricians, but Brown said one suffered burns over 65 percent of his body and the other over about 30 percent of his body and that both remained in critical condition at Santa Clara Valley Medical Center's burn unit.
The men were working on an electrical panel when it flashed or exploded about 9 a.m., severely burning them. There were no other injuries or damage to the rest of the property.
Greg Siggins, spokesman for the California Division of Occupational Safety and Health, said the state agency is continuing an investigation of the two men's employer, JAE Electric of Santa Clara, which could take six months to complete.
Siggins cautioned that such investigations are standard in industrial accidents.
"The investigation will run its course, and if it finds violations of labor law, they will be cited," Siggins said.
JAE Electric did not respond to a phone call Wednesday afternoon seeking comment.
It remained unclear who controlled the property where the two men were working.
Although technology company
Finesse Solutions had announced a move to that address in 2009, company representative Herb Burkard said Wednesday that Finesse left the Dagget Drive property in July for a new address on Leonard Court in Santa Clara and no longer had any involvement with the San Jose site at the time of the accident.


That's too bad. Remember that it is the clothes that you are wearing that burn you...not the flash coming in contact with your skin. Skin contact only results in a small burn. Wear your cotton gear or stay out of the VAC gents!
 
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