On Sun, 17 Feb 2008 10:54:40 -0800 (PST) firstname.lastname@example.org wrote:
|> I must admit to being rather shocked ( ;) ) that it *could* be marketed.
|> ICBW, but I very much doubt that such a product could be sold to
|> anyone, through "confidential channels" or not, in the UK. It is just an
|> accident waiting to happen.
| They list a 220V UK version; do they not even know what the mains
| Voltage is in the UK?
Probably close enough for government work.
| Unless I've misunderstood how it works the supplies from the mains and
| the UPS would briefly be connected in parallel; that might not be a
| good idea if the Voltages are not the same, and how do you ensure that
| they're in phase?
If they are not the same, the higher voltage source carries most of the
The steps to do this first require connecting a working UPS. The UPS
would be generating its own power in phase with the mains. So the phase
would be the same when making the transfer from mains to UPS power. At
the lab, the process is reversed to release the UPS and the HotPlug.
Again, the UPS is plugged into the mains, and syncs its phase. Then
the computer power connection can be paralleled safely between UPS and
mains. Then the UPS is disconnected.
| I haven't seen the thing, but from the description I very much doubt
| that it could legally to sold, or used, here in the UK.
It is certainly dangerous. The rules might readily disallow it from
being sold to the public. They may make exception for law enforcement.
| They suggest using it to move servers; most servers have more than one
| power supply, so you can move them from one UPS to another while
| they're running anyway. I've once moved several servers from one rack
| to another this way while they were running. Simply replace the
| cables one at a time by long ones going in through the front of the
| cabinet, very carefully pull the server out of the rack and put it
| onto the other rack, one at a time replace the temporary power cables
| with the permanent ones in the new rack. It's not something I'd
| normally recommend if you can avoid it, but it can be done.
Lots do have the redundant power supplies. Not all do. It could be used
for that. But given the hazard, I would never recommend it except in the
most dire circumstances.
| Phil Howard KA9WGN (ka9wgn.ham.org) / Do not send to the address below |
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