Can I power the two power supplies of the Cisco 7500 Series Router from two different feeds?
A. Yes, you can power the two power supplies from different feeds. However, be aware of potential differences in the grounds; take this consideration very seriously. Connect the neutral-to-ground bond of the generator to the neutral-to-ground bond of the utility service entrance to eliminate any potential differences or, at least, bring them down to acceptably low levels. Caution: Cisco does not recommend hardware products for use on floating feeds. If you do not perform neutral-to-ground bonding on floating feeds properly, you can expect effects that range from unexplained system hangs to potential differences (that are possibly lethal to system hardware) between the separately grounded systems. Naturally, the bigger the back-up generator (hundreds of kVA, for example), the more serious the effects.
