I'd imagine that depends on the enclosure
type. I have two, one is
the 9-slot-backplane only (H777 PSU), the other is the full-sized
full height job. I'll have to check into the capabilities of the 5V
PSU on both.
I feel as though I've heard multiple stories about H777s going "foomp" so
I'd be inclined to baby that PSU just to be safe. I've stuffed all kinds
of goodies at once (including a DELUA but I forget whether I tried a DEUNA
pair) into my 10.5" 11/34A+KK11A+FP11A box with no ill effects.
Yes, the BA11K box is quite robust. My first 11/34 had a full backplane load out, every
slot occupied. That was back in 1987, running a pair of RP03s and three RK05s.
The electric bill was electrifying :-)