> Hi (newbie here with possibly a dumb question). I have built a
> 12u case. I installed a single DIY kit (plus extra rails) with a
> plan to install another PSU later. I have now almost filled 6u
> and am about to get another DIY PSU kit.
>
> My question is - should I jumper (with a flying cable) the 0v /
> gnd connections of the PSUs My concern is that they are not
> earthed/grounded to a reference (not earthed to mains). However,
> as soon as I patch two modules from different supplies they will
> have a common 0v, so it probably makes sense to connect the two
> supplies. Should I do this with a plain lead Thanks in advance...
>
> Cheers,
> Andy

Yes - I'd recommend to connect the GND of both PSU. I'd recommend a cable
with at 0.75qmm cross section or more to generate a low-resistance
connection.

Best wishes
Dieter Doepfer