In Power Line Communications( PLC), existing power lines can be used to send data. Since all buildings are wired for power, use of PLCs makes a very good case for data communication without the need for data extra cabling. Three phase industrial wiring carrying high voltages and currents present a new set of challenges to PLC. How data is coupled onto these wires, how to deal with the noisy industrial environments which threaten to disrupt data transmission become important. Also, with three phase wiring schemes, there is an opportunity to use multiple phases to transmit data thus increasing throughput.