Backfeed
Backfeed is temporary or permanent energization of equipment from a source that may not be the normal operating source. It matters during construction, testing, commissioning, and safety procedures.
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Data Center Design and Operations
ERE
Energy Reuse Effectiveness accounts for energy that is reused outside the data center rather than wasted. It is less common than PUE but can matter for heat reuse, district energy, and sustainability narratives.
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Arc flash study
An arc flash study estimates incident energy from electrical faults and supports worker-safety labeling and procedures. It is not a casual calculator item; it requires qualified engineering analysis and current system data.
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Critical load is the IT or facility load that must remain powered to avoid service interruption. It drives UPS, generator, switchgear, distribution, and redundancy design more directly than total campus load.
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