"Electrical power systems are designed to be fully redundant so that in the event of a disruption, uninterruptible power supply units can be engaged for certain functions, while generators can provide backup power for the entire facility."https://aws.amazon.com/compliance/data-center/infrastructure...
So they have 2 different sources of power coming in. And generators. They do mention the UPS is only for "certain functions", so I guess it's not enough to handle full load while generators spin up if the 2 primaries go out. Or perhaps some failure in the source switching equipment (typically called a "static transfer switch").
So they have 2 different sources of power coming in. And generators. They do mention the UPS is only for "certain functions", so I guess it's not enough to handle full load while generators spin up if the 2 primaries go out. Or perhaps some failure in the source switching equipment (typically called a "static transfer switch").
Some detail on different approaches: https://www.donwil.com/wp-content/uploads/white-papers/Using...