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Manhole fire!

Originally posted by: KK
do you pour water on an electrical fire?
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After the power is turned off. Electricians control the wires and the firefighers control the fires. Reverse the two and you got trouble. 😉

Why the power is on that long is a mystery. Relay fail.
 
Originally posted by: KK
do you pour water on an electrical fire?
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I thought those were just short bursts aimed at the building to keep it from getting too hot and catching on fire too.
 
Last time I had one of those was when I ate three bowls of chili with habaneros.

That was not Chuck Norris down there arc welding!
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Obviously, you only said fire, not explosion.
 
Originally posted by: JKing106
Anyone know the real story on this? Looks like a natural gas (methane) fire to me.
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Underground electrical fire. Many times these end violently (manhole explosions). The gases resulting in the explosions could be methane or natural gas from leaks. Most of the time the insulation degrades on the primary lines (13 and 33kV most common) and they heat up and begin to smoke. The outgassing can form an explosive mixture that can suddenly ignite and the sudden pressure increase will blow manhole covers nearby many feet into the air. The principle is indifferent to the common internal combustion engine.

What's going on here however is different as there is obviously a fault that's not being cleared by overcurrent relays and continues for some time. Whether the bluish color is an issue with the camera or really exists is unknown. It does have a plasma glow to it. It's very unusual to have that type of coronal ejection without noise particularly when the source is 60Hz AC. Then again it's hard to tell what else could be down there. If high power transmission lines for communication, TV etc. are involved there could be "silent" coronas but I doubt it. That would be extremely dangerous and the EMI would've probably caused artifacts on the camera used to take this video which are not present as far as I can see.

In any case the popping sounds awesome! 😀
 
Originally posted by: Phoenix86
Can we please stop using the terms fire and explosion in regards to manholes? Thank you.
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I don't understand why they call 'em manholes when women go down them too. This discussion has an ominous luminescence upon it like a wall cloud about to let loose. eeek! :Q
 
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