Which statement describes the system + system redundant configuration?

Question

Options

• AIdentical UPS systems are required.
• BIt is the most expensive configuration.
• COnly single corded loads can be supported.
• DDesign capacities are much smaller than other configurations.

• A
  7% (3)
• B
  83% (38)
• C
  9% (4)
• D
  2% (1)

Explanation

System + system redundant (also called 2N) means deploying two fully independent UPS systems, each sized to handle 100% of the load on its own - making it the most expensive configuration because you are essentially purchasing and maintaining two complete parallel infrastructures.

Option A is wrong because the two UPS systems do not need to be identical; they can come from different manufacturers or use different models as long as each can independently support the full load. Option C is wrong because the system + system configuration actually supports both dual-corded and single-corded loads - single-corded equipment can be connected via a static transfer switch (STS) to take advantage of the redundancy. Option D is wrong because design capacities are not smaller; in fact, each system must be fully sized for the total load, meaning aggregate capacity is larger, not smaller, than other configurations.

Memory tip: "System plus system" means you are buying everything twice - two full UPS systems, two sets of batteries, two distribution paths - so whenever you see full duplication, think maximum cost.

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