Decades ago working in a sysadmin role at a hosting company I had a similar situation.
The solution I came up with was to fashion a custom male<->male power cord, like a gender changer, from some broken ATX PSU scraps we had laying around. By rearranging the power sockets from multiple donors, two male power cords could be connected on a single enclosure. Internally the sockets were simply bridged, otherwise the PSU was basically gutted.
With this goofy metal box having two male power cords dangling from it in hand, I just used a very long extension cord plugged into an outlet on the same AC phase as the existing server's power source. The extension cord powered one of the bridge cords. The other bridge cord plugged into the server's existing - and hot - power strip, forming a redundant power source. Now the power strip could be unplugged from the primary power source without losing power, and we just moved the server to the new location with the bridge box and power strip in tow.
If memory serves the only tricky part was determining which outlet at the new home was on a compatible circuit. We didn't have much in the way of electronics tools, no oscilloscopes or anything. Even the soldering involved to make the bridge box was done using my personal soldering iron, which just happened to be in the office because some of us raced RC cars there after hours.
I think I just used an incandescent desk lamp to verify a normal brightness on the bridged circuit before proceeding with the server, but it's been a while.
I wonder how many people have fashioned AC power cord gender changers throughout history... :)
The solution I came up with was to fashion a custom male<->male power cord, like a gender changer, from some broken ATX PSU scraps we had laying around. By rearranging the power sockets from multiple donors, two male power cords could be connected on a single enclosure. Internally the sockets were simply bridged, otherwise the PSU was basically gutted.
With this goofy metal box having two male power cords dangling from it in hand, I just used a very long extension cord plugged into an outlet on the same AC phase as the existing server's power source. The extension cord powered one of the bridge cords. The other bridge cord plugged into the server's existing - and hot - power strip, forming a redundant power source. Now the power strip could be unplugged from the primary power source without losing power, and we just moved the server to the new location with the bridge box and power strip in tow.
If memory serves the only tricky part was determining which outlet at the new home was on a compatible circuit. We didn't have much in the way of electronics tools, no oscilloscopes or anything. Even the soldering involved to make the bridge box was done using my personal soldering iron, which just happened to be in the office because some of us raced RC cars there after hours.
I think I just used an incandescent desk lamp to verify a normal brightness on the bridged circuit before proceeding with the server, but it's been a while.
I wonder how many people have fashioned AC power cord gender changers throughout history... :)