If you risk building in chicken coop style you run the risk of fires. Was likely going to happen that is why DC's have fire suppression and climate controls and pdu's that are rated properly with cabling that is redundant safety-wise. Why it couldn't have happened in the BFL burn in rooms instead of this site is definitely proof Karma is a fickle bitch. Cutting corners gets this result in some cases. Sad to see it happen but...