Chapter 1: DESIGN PROCESS

System voltage is the voltage capability provided by the utility service or building transformer. Several standard system voltage and wiring arrangements are in use in North America and include: 120 volt, 1-phase, 2-wire; 120/240 volt, 1-phase, 3-wire; 120/208 volt, 1-phase, 3-wire; 120/208 volt, 3-phase, 4-wire; 277/480 volt, 3-phase, 4-wire ... ................
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