Unintentional contact with higher-voltage lines

[sublimeweb]

can anyone give me a good example of unintentional contact with higher-voltage lines and how it would apply to NEC 250.4(A)(1)

 

[iwire]

can anyone give me a good example of unintentional contact with higher-voltage lines and how it would apply to NEC 250.4(A)(1)

A high voltage overhead line breaks and drops down onto the low voltage conductors.

 

[robbietan]

In my tropical country, most of the causes are kite strings and trees, most often bamboo "trees" exceeding the height of the 34.5 kV lines easy

 

[K8MHZ]

A high voltage overhead line breaks and drops down onto the low voltage conductors.

That happened near here about 4 years ago. A 315kv line dropped on a (I think) 64k line. The resulting fire raged for days and I could see the smoke from the fire 10 miles away. They had to actually build a road a couple miles or more long through a river flat to get fire trucks to the fire. People were trapped on the river in cabins. It was nasty.

 

[Sahib]

That happened near here about 4 years ago. A 315kv line dropped on a (I think) 64k line. The resulting fire raged for days and I could see the smoke from the fire 10 miles away. They had to actually build a road a couple miles or more long through a river flat to get fire trucks to the fire. People were trapped on the river in cabins. It was nasty.

Oil fire?

 

[K8MHZ]

Oil fire?

No, grass and trees. Luckily mostly tall grass, only a few trees got burned.

If I could find the pics I took, I would post them. I tried to find a news link for the fire, but since it was a few years ago I had no luck.

 

[K8MHZ]

Sahib,

I found some pics on line.

http://photos.mlive.com/photogallery/2010/04/muskegon_river_flats_fire_apri_3.html

Here is one of them.

This happened about 3 miles from the power plant, so the available short circuit current must have been tremendous.

 

[Sahib]

Thanks, KBMHZ.