Arc flash burn

[zog]

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

There are some gross misconceptions in there.

The arc flash boundary is not usually > shock boundary for higher voltages (pg 29) it is the opposite, usually the flash boundary at LV is > shock boundary and vice versa.

The 4 ft rule for FPB has a limitation of 300,000 amp-cycles, that is vital, this slide gives impression an analysis is not required for 480V systems when usually the arc flash hazards on 480V are more than at 13,800V

Everything on slide 35 is Bull, misconceptions all over, no such formulas exist and the studies are being misunderstood and used dangerously.

The table on pg 37 is scary, based on what?? That table is going to get someone killed.

Pg 38, what is that, voltage based arc flash PPE tables, complete misconception.

Sorry, i just breezed through this but this was put together by someone who pirited some info from the Bussmann presentation and either does not understand arc flash and 70E or changed what they wanted to make compliance easy for thier company.

Get some professional training.!!

 

[Lxnxjxhx]

"shock boundary"

"shock boundary"

I guess I can imagine what this is, but can you refer me to some relevant online references for this term? Thanks.

 

[Lxnxjxhx]

lost his moustache, eyebrows and front hair.

lost his moustache, eyebrows and front hair.

Do they also get retinal problems later?
And I thought table saw injuries were bad. . .

 

[zog]

I guess I can imagine what this is, but can you refer me to some relevant online references for this term? Thanks.

Actually there are 3 different shock protection boundaries in the NFPA 70E for each voltage range. Limited Approach Boundary (LAB), Restricted Approach Boundary (RAB) and Prohibited Approach Boundary (PAB)

 

[Lxnxjxhx]

. . .3 different. . .

. . .3 different. . .

Thanks, I'll pursue this.