APC PDPM277H User Manual download pdf (Page 11)

APC by Schneider Electric – Mark Tarantelli – 4 November 2008

Single Phase Voltages

● Servers draw their power from the 208 V high voltage (line to line) connection in North

America

● They draw their power from the 230 V low voltage (line to neutral) connection in almost every

other country

● comparison should be between 120 V and 240 V and NOT between 208 V and 240 V.

● Assume 20 amp circuits are provided to the load in either case.

● 120 V “line to neutral” distribution method is calculated as (20 amps x 120 V x 3 = 7.2 kW

● 240 V “line to neutral” distribution method is calculated as (20 amps x 240 V x 3 = 14.4 kW).

● 240 V distribution provides 100% more power than the 120 V distribution.

208 V

Typical

Load

Neutral

Typical

Load

240 V

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APC PDPM277H User Manual Page 11