On 0,4 kV three-phase networks (aerial or insulated) the LV phase comparator is able to identify the phases between the base station anda remote point.The transmitter devise shall be connected always to the phase conductor on the base station.Using the receiver device each phase of the base station can be identified at any point of the network, moving away from the base station.The transmitter and receiver communicate via radio frequency. The range of transmission may vary between 100 and 200 meters, depending on the transmission of the RF signal.