Single-phase vs three-phase UPSs: how to choose the right one. (Electrical).

Plant Engineering, September, 2000 by Burke, Kevin

Today's automated manufacturing equipment, assembly lines, and large distributed control systems depend on reliable power to sustain operations. The consequences of a power disturbance or interruption can have dire results, including safety of the employees, equipment damage, defective products, late shipments, or lost business.

The growing emphasis on plant floor to boardroom data flow for enterprise resource planning (ERP) systems also relies on dependable power. The wired enterprise's need for continuous power to support information technology now demands 24/7 (24-hr. 7-days/wk) operation at a level known as five-nines reliability (0.99999), which means in any single year, the power quality is below acceptable levels for less than 6 min.

For the...

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