Ok, how are people powering these things? 2.4kW is well beyond a standard circuit in the US. Are people having 240V/30A circuits installed? Are they hijacking the dryer plugs? EV charger plugs? Hottub circuits?
The business of protecting individual power cords was handled by an Eaton PDU that had a 30a twist-lock plug on one side and a couple of rows of current-limited IEC C13 sockets on the other side.
Certainly on my panel the only "single outlet" breakers are hot water, AC, oven/stove, dryer.
Also, another place where you might already have this outlet: some older houses that use window AC units that were larger had 240V 20A outlets. Not common these days, but you can still buy these types of window AC units.
If you're gonna get rewired you may as well install a 240v circuit, and some 120v 20a sockets while you're at it.
I'm very close to just running a cord over or devising a way to put my machine closer to a second circuit because my rental is horribly setup and both my bedroom AC and living room desktop (that also doubles as a ML training box) end up on the same circuit.
It would require an additional run of 14/2G romex (12/2G for 20A) and a single-pole breaker, but allows you to skip cutting in an old work box to add a 2nd duplex receptacle.
You could possibly replace the existing 14/2G with 14/4G which has enough conductors for both circuits.
The receptacle is the easy part, running the new circuit is the hard part.
Or you know, install a new 240V receptacle.
If I have to:
1) Run wire
2) Get a bigger breaker box
3) To do it legally, hire an electrician and maybe get a permit
Replacing the receptacle is like, <1% of what's involved there.
Any 15A or 20A duplex receptacle can have the tabs broken to get two separate 15A or 20A simplex receptacles, you don’t need a 5-20R for that, a 3-wire 5-15R works just fine.
Someone upthread mentioned 1.2kW load which a 15A receptacle handles just fine: .8*120*15=1,440W continuous. Bumping that up to 20A only gets you an additional 480W of continuous load: .8*120*20=1,920W. A continuous load is one that runs for 2 hours or longer, the overcurrent protection and wire must be upsized by 1.25x (or derated to 80%)
Most receptacles in homes are wired with 14/2 romex which is only good to 15A (in homes, which use the 60C ampacity column) which is why I suggested pulling another run of 14/2G romex and breaking the tabs. Pulling 14/2 romex to an existing receptacle usually isn’t that hard if you have a fish tape.
AFAIK computer PSUs can’t easily use 240V power without a PDU in the middle, but I’m likely wrong on that, especially for server PSUs.
I'm air cooling so I set -pl 450 so I'm not running them all at the full 600w