ELECTRICAL VOLTAGES AVAILABLE

ELECTRICAL/MECHANICAL CHARACTERISTICS (cont) - TM-55-1930-209-14P-9-4_132

Figure 2 3-Phase Delta Common Voltages: 110/220; 120/240; 208; 440; 460; 480

TM-55-1930-209-14P-9-4 Water Purification Barges (NSN 1930-01-234-2165) Electric Power System Manual
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ELECTRICAL VOLTAGES AVAILABLE TESTING AND ADJUSTING SUBJECT/TITLE: AC Voltages Available from Caterpillar SR 4 Generators BUSINESS: Building Services, Material Handling, Marine, Agriculture PRODUCT: Generator Sets Most generator set applications require that the electrical output match one of several existing commercial voltages and one of two frequencies. Where the generator set is replacing, or supplementing commercial power, the existing frequency and voltage characteristics will determine generator selection. Where the generator set is to be totally isolated from commercial power, the proposed load (particularly motors) will determine generated voltage and frequency. Practically all electric motors above 5 hp are three-phase, and motors of lesser horsepower can be single- or three-phase. The more common commercial nominal voltages and frequencies are: 60 Hz - Single-Phase/Three-Phase 120/208Y, 125/216Y, 127/220Y, 277/480Y, 120/240 60 Hz - Three-Phase Only 220, 240, 480, 575, 600 60 Hz - 3-Wire, Single-Phase Only 110/220, 115/230, 220/440 50 Hz - Single-Phase/Three-Phase 220/380Y, 230/400Y, 240/415Y 50 Hz - Three-Phase Only 460 Note: The slant (/) line indicates both voltages are available at the same time. With the exception of the 60 Hz 3-wire single-phase 110/220 and 220/440 systems, all other dual voltage systems consist of a single-phase lower voltage, and a three-phase higher voltage. Generally, voltages above about 220 volts originate from a three-phase source. Commercial distribution is more commonly three-phase which also permits use of single- phase loads. Some distribution is single-phase. This system is limited to single-phase loads only, unless special transformer-capacitor equipment is used to simulate or approach a three-phase voltage. Larger industrial loads are usually three-phase, with single-phase loads supplied from one or more of the phases. The following diagrams show how commercial distribution transformer secondary windings are connected to obtain one of the above listed common three-phase and single-phase voltages. Figure 1 3-Phase Y, Wye, Star Common Voltages: 120/208Y; 125/216Y; 127/220Y; 230/380Y; 230/400Y; 240/415Y; 277/480Y The listed lower voltages of this dual voltage system are single-phase and can be obtained from any one Line (L1, L2, L3) and the Neutra (N). The higher voltages are three-phase and are obtained from L1, L2, L3. 93

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