On an SL8500 how can i tell if my power setup is N+1 or 2N as the SL console display is inconsistent

Hello,

We have an SL8500 at a remote site so can't readily check the actual "plugging" on the pdu's as to whether it's an N+1 setup or 2N.

The Sl console display has a number of drive and rail power supply types as N+1 e.g. Drive-AC2N+1 but the PDU's just show as PDU1-AC1 & PDU2-AC2 which implies a 2N setup.

I'll attach a screenshot so you can see what i mean.

We are putting in additional drives and want to check if we need more drive power supplies. 

Thanks

Dave