It is quite common to have 1 AC cord feed multiple PSUs, just bounce the hot/neutral/ground along them.
In your case, you have 1200W of very efficient PSUs so they may draw a little over 10A, and 10A is OK on one good quality plug/outlet. (When I have 4 PSUs, 1400W output total, capable of sucking in 1700W and hitting the typical 15A rating, it depends on who assembled the unit whether there is 1 cord or two. Preassembled tended to have 1 cord, but the enclosures I got for the ones I built had 2 holes for cords so I added 2 cords. So I would say you are on the borderline here and can do as you'd prefer - one cord or two.)
Yes it is a good idea to hook all V- together coming out of the DC power supplies so you have a common V-. In some cases, they are connected together on the output board anyway, or doesn't matter, or ... but why take the chance. If you bounced the AC along the PSUs, bounce the output negative along too.
In your case, you have 1200W of very efficient PSUs so they may draw a little over 10A, and 10A is OK on one good quality plug/outlet. (When I have 4 PSUs, 1400W output total, capable of sucking in 1700W and hitting the typical 15A rating, it depends on who assembled the unit whether there is 1 cord or two. Preassembled tended to have 1 cord, but the enclosures I got for the ones I built had 2 holes for cords so I added 2 cords. So I would say you are on the borderline here and can do as you'd prefer - one cord or two.)
Yes it is a good idea to hook all V- together coming out of the DC power supplies so you have a common V-. In some cases, they are connected together on the output board anyway, or doesn't matter, or ... but why take the chance. If you bounced the AC along the PSUs, bounce the output negative along too.
