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If you have a 4000A pringle switch trip, make sure you take a look before you try to close it. Here is what I know...

480V 4000A AL Duct in a 14 story building in Arlington, VA. Pringle switch tripped and was reset and a fireball consumed a good portion of the 14th floor. Every 90 blew out (holes large enough to stick an arm much bigger than mine through) from the 14th to the sub-basement parking garage where the service is located. The true cause of this failure is known by few people, and I am not one of them. Just a reminder of the forces that we deal with. This happened over the 4th of July, so thankfully no one was injured. This could have been a lethal disaster. It wasn't....

VAElec
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