21. World's Fair in Chicago, part of their " Tesla Poly-phase System ". 22. Three-phase systems may also have a fourth wire, particularly in low-voltage distribution. 23. Usually analysis of a three-phase system is simplified by assuming balanced loading of all three phases. 24. In all cases, three-phase systems will handle more power and operate a bit more smoothly. 25. This three-wire single phase system is common in North America for residential and light commercial applications. 26. The technique of symmetrical components is used to simplify analysis of unsymmetrical faults in three-phase systems . 27. For example, the free-molecular kernel which describes collisions in a dilute gas-phase system , 28. In 120 / 208 three-phase system , the neutral is the center of the wye transformer. 29. While planning for the second phase, the Master Plan was changed and the phase system was discontinued. 30. He did this by calculating Avogadro's number using three different methods, all involving liquid phase systems .
