What is the correct designation when a load of 100 kW is supported by a single 100 kW UPS?

The correct designation for a load of 100 kW being supported by a single 100 kW Uninterruptible Power Supply (UPS) is N. In this context, "N" represents the number of units required to support the load completely, which, in this situation, is one unit of 100 kW capacity. The UPS is designed to handle the load without any redundancy; therefore, it meets the load requirements exactly.

Understanding the other designations helps to clarify why "N" is the appropriate answer. For example, "N+1" would indicate that there is one additional unit beyond what is necessary to support the maximum load, providing redundancy in case of a failure, while "2N" would imply a system capable of supporting twice the load, indicating a more robust capacity. "N-1" would indicate a system that could fail and still support the load, which is not applicable here since there is no redundancy or excess capacity. In this case, the correct term to use when describing a load supported by a single equivalent UPS unit is indeed "N".