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.
Benefits of three-phase circuits for power distribution A three-phase power circuit, also referred to as a polyphase (more than one phase) circuit, provides more power for the same current than would a single-phase circuit.his is significantly less than the 125 amps required for the conductor of a single phase system. To carry the 42 amp load, the copper conductor would need to be 8 AWG. This 8 gauge wire weight is about 5 pounds per 100 feet and a total cost of $17 for the bare copper material.