But, that doesnât mean students have to take them all in the same week. Our class structure allows us to provide 5 cycles of classes for every 30-day period. As long as students take the classes in order, (Class 1, Class 2, Class 3, Class 4), they are free to switch between any of the cycles for that 30-day period. The only other requirement is that all 4 classes must be completed within 30 days of the first class.
Re: Advantages of three phase systems over single phase. The big advantage with 3 phase mains is that any electric motor connected to it is more efficient, has smother running and uses less parts so is more reliable. There is also a slight advantage in using 3 phase transformers over single phase ones.
The design of three-phase motors, with one set of windings for each phase, is highly efficient and allows three-phase motors to draw significantly less current than the equivalent single-phase motor. Home hobbyists and small shop owners often face the problem of three-phase equipment with no three-phase service.his comes at the price of a 2/3 reduction in the rated horsepower and a shorter life expectancy for the motor. At startup, a static converter temporarily provides the third leg of three-phase power by discharging starting capacitors.