Each coil of three phases has two terminals [one 'start' (8) and another 'finish' (F)]and if
individual phase is connected to a separate load circuit, as shown in Fig. 4, we get a non-interlinked
3-phasesystem. In such a system each circuit will require two conductors, therefore, 6 conductors
all. This makes the whole system complicated and expensive. Hence the three phases are gene
interconnected which results in substantial saving of copper.
The general method of inter-connections are:
1. Star or Wye (Y) connection.
2. Mesh or delta (∆) connection.