On 2 June 2017 at 15:06, Paul Brown <[email protected]> wrote: > There was also the Telehouse incident in 1998 (I think - may have been > '97) when somebody hit the Master Off switch in one of the suites rather > than the Open Door one, and then lots of ISP's kit responded badly to the > power surge when the breaker was reset. > There was also an incident at Telehouse North in the early 2000s during a full load generator test, when they simulated a generator failure. The remaining generators couldn't handle the load step, and also shut down. As they picked up the load, the UPS system feeding the B bus (iirc) suffered an undervolt for a single cycle, which caused the UPS to go to bypass. The bypass feed was connected to the grid breakers, which were open at the time for the generator test, and everything became very quiet in Telehouse for about six seconds. This was presumably how long it takes for someone to swear viciously and close the grid breakers, at which point it became only marginally louder as almost every single breaker on every single PDU on the B bus tripped all at once.
Fun times. -- Maria Blackmore Professional Network Fairy
