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208V vs 120V FAQ Can my server use 208V? Most 2005 and later power supplies for electronic equipment use auto-sensing 100-250V input voltages. Some earlier models used "switchable" 120-240V p.s.s. What makes using 208V better than 120V? The main reason that 208V is better is 120V has wasted heat. The higher the voltage used, the lower the amps used, lowering the wasted heat in several ways: 1. Even though amps is a measure of the volume of electric energy, a given watt-load would incur less resistance through the same cord size when less amps are required. For a 250W server: @ 120V, the amps draw is (from: Watts=Volts* Amps) = 2.08 Amps @ 208V, the amps draw is = 1.20 Amps Even over small copper wires, the heat in the cord is reduced when using 208V. 2. A/C electrical energy using two wires (a circuit) at 120V uses one "hot" wire and one "neutral" circuit return wire, which is normally grounded. The neutral wire bleeds a small (5%) loss to the ground when compared with the same wattage loads in a normal colocation electrical setup. A 3phase 2-wire 208V (3 circuits: A+B, B+C, & C+A) uses less energy in comparison to a singlephase 120V (3 circuits: A+N, B+N, & C+N) burning the same wattage. The neutral wire is used conventionally for low voltage circuits; it was developed in the USA in the early 1900's as a safer circuit, with one wire grounded. A 208-volt circuit is more efficient.