IIRC, the 3 power supplies are each capable of handling 1/2 of the
load; you have a 3/2 power supply.  The theory is that you can lose
any one of the three and still run with no problems.

The logic is that a power supply for 1/2 the load is cheaper than one
that can handle the full load; and providing an extra 1/2 is cheaper
than providing two full-sized power supplies.

--Paul E Musselman

>Ian wrote (in part):
>Quick Note FYI.
>Had a power supply go the other day on our 820 V4R5.
>No Probs - its got 3, so 2 spare - 99.999 uptime eh.
>Not quite.

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