@JonRB Random ampacity charts suggest you might be looking for 1000 - 2000 kcmil wire, which is a beast. If it's not DC, then you're also going to be seeing skin effect at 50/60Hz trying to get a cable that big.
I'd probably look for a local industrial electrical supply. Dealing with cable that big is a big pain, you may want to get someone with experience and tools appropriate for the job.
basically in discussion with another company who pre-empted aspects "oh its only 1MW, oh its onlly"
with zero electrical or system appreciation :)
so the mechaical have already gone in with the concept of cables (non-defined) so have asked us to size 6phases. the MD immediatly went that the voltage should be higher and it should be busbars.
@Marla potentially, or some form of water-glycol. just spoke with them they are happy to drop to 5AWG but 6off in parallel. Still looking at about 3kW of losses just in those runs, plus localised heating
Now you can go on electronics.se and ask how long a cap in a PSU would stay charged, because you wanted to change a fan but some guy on the internet told you you might die.
you would need an iusolated pump/heat exchanger per
well once skin depth was explained to teh customer such that if single cable was used the diameter was silly large (1.8mm skin depth taking 600A...) and the solution was 5AWG but 6off per phase (and thus some nasty failure modes...)
Busbar and potentially increasing the DClink to 3kV was back on the table
@Vogel612 That's an "it depends" question, but the capacitors are supposed to have a discharge circuit. Easier to measure than to guess through the internet
So I have a POS system that has 2 COM ports with adjustable 5V/12V jumpers. I can test out on pins 5 (GND) and 9 (5V/12V) for 5V (when set via jumper) with no problem, but when I try while it's set to 12V I only get somewhere between 5.6-5.8V.
Is it likely that this would have a -V and a +V pin to reach 12V?