gernthefish
@wfu.edu | PDU contraints
Obviously a server that requires 220v won't work if plugged into a 110v PDU, but is the opposite true? Can a server that requires 110v power be plugged into a 220v/24A PDU? |
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aurgathor
join:2002-12-01
Lynnwood, WA | Some switching power supplies can tolerate 2x overvoltasge, some don't, and the latter will release some magic smoke.
BTW, many power supplies have a 110/220 selector on them. |
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whizkid3
Premium,MVM
join:2002-02-21
Queens, NY | reply to gernthefish
Many servers work from 90 volts - 250 volts. It all depends on the server and its power supply and its ratings. |
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leibold
Premium,MVM
join:2002-07-09
Sunnyvale, CA
clubs: 
| reply to gernthefish
What kind of PDU are you talking about ?
The first reason I'm asking is that you are posting from the US where you would have either 208V in a 3 phase system or 240V in a single phase system (either voltage is of course perfectly fine to feed to equipment rated for 220V due to permissible tolerances). The term 220V is much more common in other parts of the world, especially Europe (mostly for historic reasons since the actual voltage has been standardized at 230V).
The second reason I'm asking is the 24A current rating. The output breakers of a power distribution unit are commonly 15,20 or 30 Ampere. Is this PDU perhaps attached to a 5kW UPS or generator ?
If your PDU is a 3 phase 208V unit it will have 208V between phases and 120V phase to neutral, meaning that it can be used to attach a server that requires 110V.
If your PDU is a single phase 240V unit designed for the Northamerican market it is likely to be a split-phase design with two opposing phases of 120V each. This too would be usable to attach a 110V server.
In both of those cases however the electric connection between PDU and server needs to be done properly by an electrician (you wouldn't be asking the question if you were qualified to do this yourself). Attaching 120V loads to a 208V/240V distribution system can create an imbalance. That is often not of any significance unless the imbalance is extreme (all 120V loads on the same phase). However a low powered generator or UPS is more likely to be sensitive to such imbalances.
To get a specific answer to your situation you need to provide a lot more detail on both the PDU and the server you want to attach to it.
Attaching a device to twice the voltage it is designed for will cause damage!
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