Arc flash burn

[brother]

What do you think?? electrical safety . the guy in the burn had almost died.


http://www.arkansasashrae.org/Speaker Slides/Electrical Arc Flash Training NFPA 70E.pdf

 

[76nemo]

What do you think?? electrical safety . the guy in the burn had almost died.


http://www.arkansasashrae.org/Speaker Slides/Electrical Arc Flash Training NFPA 70E.pdf

When it's done buffering on Sunday, I then will comment:grin:

 

[frizbeedog]

When it's done buffering on Sunday, I then will comment:grin:

What is buffering? Link sucked, is that what you mean.

 

[quogueelectric]

There is a new sheriff in town and his name is OSHA. Get used to it it is not going away.

 

[76nemo]

What is buffering? Link sucked, is that what you mean.

I minimized it and it's still progressing until I just zapped it after looking at it ten minutes later

 

[brother]

What is buffering? Link sucked, is that what you mean.

are u saying that the link did not work?? it seems to be working fine for me.

 

[frizbeedog]

are u saying that the link did not work?? it seems to be working fine for me.

Other than the pics there was nothing there. I'll try again. It's Friday and I may be PWI, so I'll check it out. Sorry.

 

[frizbeedog]

Other than the pics there was nothing there. I'll try again. It's Friday and I may be PWI, so I'll check it out. Sorry.

ok I got it now. :grin: :grin: :grin:

must be the tequila talking. :grin: :grin: :grin:

 

[Lxnxjxhx]

Can anyone explain how only 480v can make a 3" arc? I used to get arcs this long with 15 kV neon sign transformers.

 

[mdshunk]

Can anyone explain how only 480v can make a 3" arc?

The gap that started the arc in the first place will be much shorter, naturally. Something along the lines of a misplaced screwdriver. After the air ionizes, 480 can certainly maintain a stabilized 3" arc if there's metal to burn and the fuses are sufficiently large.

 

[Lxnxjxhx]

more elec. burns, not for the squeamish. . .

more elec. burns, not for the squeamish. . .

http://www.cdc.gov/niosh/docs/2002-123/images/burn-ARM copy.jpg

I heard there is a 4th burn (which is to the bone) but I can't find it at the moment.

 

[Lxnxjxhx]

if there's metal to burn. . .

if there's metal to burn. . .

so it's more like a flow of plasma, and nothing like the 15 kV @ low current from the xformer.

 

[mdshunk]

so it's more like a flow of plasma, and nothing like the 15 kV @ low current from the xformer.

yep, yip yip yip yip, uh-huh, uh-huh.

 

[frizbeedog]

yep, yip yip yip yip, uh-huh, uh-huh.

You lost me on that one Marc. I did'nt think you drank. :grin:

 

[brian john]

4:19 AM, 4/24/2008, Just finished another one, electrician burned, building was down 19.5 hours. Damage to electrician, bus in MDP, and associated CB's. Luckily the injured worker was treated and released. No PPE, no business doing what he was doing. BUT WAY LUCKY, this was a phase to phase fault on a 4000 amp SWBD. GFP not not open the switch, fuses in the street opened. Bad coordination, lucky electrician.

 

[brother]

4:19 AM, 4/24/2008, Just finished another one, electrician burned, building was down 19.5 hours. Damage to electrician, bus in MDP, and associated CB's. Luckily the injured worker was treated and released. No PPE, no business doing what he was doing. BUT WAY LUCKY, this was a phase to phase fault on a 4000 amp SWBD. GFP not not open the switch, fuses in the street opened. Bad coordination, lucky electrician.

what was the voltage on this panel?? Thank God he lived.

 

[nakulak]

what was he doing ?

 

[Lxnxjxhx]

yep yip yip

yep yip yip

And a secret of the universe awaits those who Google the exact phrase

"dip-dip, dooba bop bop dip-dip, dooba bop bop"

 

[brian john]

480/277 VAC, removing a CB from a MDP, lost his moustache, eyebrows and front hair.

 

[ron]

I didn't check each detail on each slide, but it looks nicely put together.
Would it happen to be available as a powerpoint file .... for sharing?