A low tension line can be considered as the line that has an operating voltage till 1000 volt which is 1Kv. This is the 230V and 440V in our household so it is the local distribution line. Through the low tension or low voltage line we are receiving power to our home. Low tension lines are more susceptible to faults because it is connected to the loads. The transmission line from the substation to the pole-mounted substation will be a high tension line and from the pole mounted substation our house or office is a low tension line and mostly there won’t be any transformers between low tension lines but we can see transformers in high tension lines. So basically we can say that a high tension line and low tension line is for power transmission but to do the operation of our equipment we need low voltage.