N+1 redundancy
N+1 redundancy means a system has the number of components needed to carry the full load (N) plus one spare, so any single unit can fail or be serviced without losing capacity. It is commonly applied to generators, UPS modules, chillers and cooling units. N+1 protects against one component failure but not against failure of a shared path, which is where 2N designs differ.
The full guide · Power & interconnectionRedundant Utility Feeds and Dual Substations for Data CentersHow data centers get two independent utility sources, what makes a second feed truly independent, and how dual substations affect cost, land and timing.Where N+1 redundancy comes up
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