You should be using a decent UPS (like a SmartUPS 1500VA or similar) to protect it against uneven/unclean power, including outages, brown outs, surges, etc.   I don't thing the x950's have firmware updates specifically for the power supplies like some of the newer ones do, but make sure your system firmware (BIOS, ESM/BMC, DRAC, etc.) is up to date.
Hi, I would like to adjust the power supply redundancy on my PowerEdger 1950 and 2950 Gen II servers. Currently the servers load balance the power between ps1 and ps2. I wish to change this by passing all the power through ps1 and keep ps2 in some form of "stand-by" without load.  I am not able to use OpenManage due to constant connection errors and can access the servers physically or by using DRAC5. Any suggestions please.  
Power Supply Redundancy Settings for PowerEdge 1950 & 2950 Gen II