DOL or star delta starter

There is no hard and fast rule as to the option of going for a DOL Starter or a Star-Delta Starter for a given motor. If you draw power from an LT Mains, then the line voltage drop due to DOL motor starting, might affect your neighbouring customer, causing a social issue. If you draw power from a HT supply, there are no such issues but nevertheless, the motor would be subjected to incrased thermal stress on a DOL starting, thus reducing its life. But, DOL is cheaper. Whereas, star-delta starting reduces the starting current and thus the thermal stress on the motor, but, it is costly and also the starting torque would reduce by 3 times. Genral practice in industry for a 11kW motor is to go for a DOL starter.