Not only doesn't DC let go....

by beejay5169

It also creates an arc that's difficult to quench, as the voltage doesn't collapse to zero 120 times a second like AC does (or 100 times if you're on 50 Hz). 1/2 million volt DC transmission systems are popping up a lot lately, and use some sophisticated systems to kill the arc when they break a circuit carrying current. When that system fails - well, check out this example of a relatively low DC voltage arc... (Fast forward to about 1:45)

https://www.youtube.com/watch?v=ndHm12bNaDc

That's only 600 volts DC; a 600 volt AC arc only gets a few centimeters long before it dies all by itself.

Posted on Nov 4, 2017, 2:01 AM

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  1. 3 phase AC too. Dave H, Nov 4, 2017

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