What allows you to support single-corded loads in a 2N UPS redundant configuration?

Question

Options

• ADC disconnect
• BTransfer switch
• CStatic bypass switch
• DWrap around external bypass

• A
  4% (2)
• B
  80% (43)
• C
  6% (3)
• D
  11% (6)

Explanation

A transfer switch, specifically an automatic transfer switch (ATS), solves the fundamental problem of single-corded loads in a 2N UPS configuration: it connects to both redundant UPS paths (A and B) and automatically switches the load to the healthy path if one fails, giving a single-cord device the same redundancy benefit as a dual-corded device. A DC disconnect (A) is used to isolate the battery bank from UPS circuitry for safety or maintenance and plays no role in routing power to loads. A static bypass switch (C) reroutes load power around the UPS internals to utility power during a fault or maintenance window - it protects the UPS, not the load's redundancy path. A wrap around external bypass (D) similarly allows the entire UPS to be bypassed for servicing and does not address how a single-corded device connects to two separate UPS feeds.

Memory tip: A transfer switch transfers the power source - it moves a single-cord device between two redundant paths, bridging the gap that a single cord cannot span on its own.

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