On Sat, 24 Mar 2018 14:52:35 -0400, "Mr. Luddite"
wrote:

On 3/24/2018 2:28 PM, wrote:
On Sat, 24 Mar 2018 13:30:10 -0400, "Mr. Luddite"
wrote:



but not for me ...

https://tinyurl.com/yb9cbkae


===

That's an impressive looking arc. I wonder how many volts were on
that cable?


I think the standard voltages for distribution is now 69,000v and
115,000v in most places.

Some lower ones are 13,500 volts but would not draw an arc like that.
The house we had in Duxbury was fed underground from the road to a
transformer closer to the house. It was 13,500v in a coaxial cable to
the primary of the transformer. The secondary fed two, 200 amp panels in
the house and another 100 amp panel in the garage. It shorted one day
where it ran into the ground by the road and the whole ground shook.
It's amazing though. The primary fuse on the pole is only a 15 amp fuse.

Lotsa volts anyway.


===

Lotsa volts for sure. I sort of recall a rule of thumb that
electricity can jump a 1/4 inch air gap for every 1,000 volts. I'd
estimate the arc in the video at about 3 feet, which leads to a quick
voltage estimate of 36 x 4 = 144KV. It might have been lower however
because once an arc is struck it can extend farther because an
ionization path already exists. That's the principle behind a "Jacobs
Ladder" which is kind of a cool demonstration.

https://www.youtube.com/watch?v=6hhaaSSCU5k




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