Excellent article on Arc Flash

[Gerald Newton]

http://www.avotraining.com/common/documents/ARC-FLASH PAPER.pdf

 

[Bob Peterson]

yes it is. I sent it to a number of engineers I work with.

 

[John Gilmer]

http://www.avotraining.com/common/documents/ARC-FLASH PAPER.pdf

There is a statement about a 10,000 Amp arc in a 480 volt circuit being 8
megawatts and the equivalent of 8 sticks of dynamite.

1) I don't "get the math."

2) I think I would prefer being at certain distance from an arc than "8
sticks of dynamite."

The piece should have been edited a few more times.

Why, for example, does the "energy/time" chart use a non-linear axis for
time?

 

[Charles Perry]

Why, for example, does the "energy/time" chart use a non-linear axis for
time?

My guess would be since protective device clearing times are often dealt
with on logarithmic scales?

Charles Perry P.E.

 

[John Gilmer]

My guess would be since protective device clearing times are often dealt
with on logarithmic scales?

Maybe.

But something that was LINEAR was made to appear non-linear by the choice of
scale.

Some years ago (maybe 20) someone wrote a book about good and bad charts.

The BEST chart the writer reported was one showing the shrinkage of
Napoleon's Army on the advance to and retreat from Moscow. A lot of
understandable information on a 1/2 page.

The WORSE came from someone in the EDUCATION journal. The information
content of a near incomprehensible graph was a SINGLE NUMBER!