The total input power for the server is divided equally among the power supplies in operation. Reversing the positive and negative inputs to the power supplies of a DC input server will not cause damage. However, the power supplies with reversed input will not operate.
The inputs to a power supply are isolated from the server chassis and the other power supply inputs. The AC or DC power inputs might be at different voltages within the acceptable range and might have different offset voltages relative to the server chassis.
Note - The server does not require an additional surge protector for the AC power configurations if the facility has a surge protector that limits voltage surges to less than 2000V. You can, however, install a surge protector if your site requires an additional protector.
Caution - Safety agency requirements prohibit Oracle Corporation from changing a product from AC input to DC input or from DC input to AC input after the product has been removed from the agency approved manufacturing site.