Are you taliking about Teir 4 UPS system?Does anyone know or have a link to the exact defenition of N, N+1, N+2, and 2N electrical distrubtion for a data center?Thanks
APC's Symettra series doesn't really do true N+ redundancy, though, they have a quasi-internal redundancy which does offer redundancy, but not in the conventional sense. It offers some advantages at a reduced cost, but lacks some of the advantages of a true N+1 system; namely that you can secure one half of a parallel-redundant UPS for maint while the other assumes the load. They have some excellent white-papers on their website though.Check www.apc.com
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