PowerEdge dual power supply and power load balancing

Hi,

We have a few PowerEdge 1950 and R710 servers with dual power supplies (PSU).

We have two completely separate power circuits (PDU) at our datacenter.

For each server we have connected a power supply to the first circuit and another power supply to the second circuit to obtain full power redundancy.

Will each server balance the power load across its two power supplies and thus the two datacenter circuits (e.g. active-active setup) or will a single power supply draw most of the power from a single circuit at any time (e.g. active-passive setup)?

I think what happens is the former, with load (almost) balanced between the two, but I'd like to get a confirmation from someone who actually knows that for sure or tested the setup.

Also, to get full redundancy, I think we need to keep the total power consumption low enough so that a single circuit can provide enough power to match the sum of the power currently drawn from both circuits, is that right?

Thanks.