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RE: Why do we use facilities with EPO's?
On Fri, 2007-07-27 at 13:09 -0400, Barry Shein wrote: > > Also, NOT TO BE TOO LITERAL MINDED, but isn't the point of a UPS that > it has a lot of power even when it's not getting any externally? > > Doesn't hitting an EPO on a UPS at best only reduce the electrical > hazard of hitting it with water a little bit? Not an engineer, and not a firefighter, but I think I can answer this one. Yes, hitting the EPO would leave a lot of power potential stored in the batteries in the UPS. The point of the EPO is to isolate those batteries from both the external (possibly high voltage) feed coming into the UPS and to isolate them from the inverters, transformers, power points (plugs) and whatever else is used in the build-out getting the power out of the batteries and to the equipment. This achieves a couple things. * It potentially removes one of the requirements of combustion (heat/energy input). * If the fire is not within/around the UPS itself, the firefighters can avoid the power that is still in the room. * Removes the power from the wiring below your raised floor so water will not come in contact with the power present during normal operation. I'm sure that there are others out there that could give you even more reasons, but these are the ones that come to mind immediately. --- Tim Donahue