[AusNOG] Bottom of rack UPS

[Bob Purdon]

> In addition to the points others have raised, in most environments power is now at a premium, which means you may only have small capacity breakers to enforce your electrical allocation.
>
> If the power does go out for an extended period of time, the UPS that runs fine day-to-day may just pop a breaker when it attempts to recharge and bear your startup load at the same time.

If you're that close to the breaker rating then there's a good chance 
the startup load alone will trip the breaker.  Lost count of the number 
of times I've seen that happen...

Much prefer using breakers for protection only, and leaving the 
enforcement of usage levels to active monitoring & contracts.